Holley Accelerator Pump Cam Chart

all that is useless info cos you have a holley ok, well. Then adjust accelerator pump linkage, No play at all in the linkage. While there may be some overlap, each system can generally be treated as though it is completely responsible for air/fuel mixtures within its range of throttle settings. com and 37 squirter,played with accelerator pump cam. carb and am down to the accelerator pump squirters and cams. When the mechanical fuel pump leaks oil from a silicone gasket, the cause can often be traced back to improperly tightened pump mounting bolts. See attached chart and graph. BUT if you want/need to tune the nozzles, or the air bleeds, you have to purchase their kit (air bleeds $35, nozzles $55, iirc), and the kits are. I believe the accelerator pump size is a 30cc, and I'd have to find out the cam size for the pump too. If you order a set, they may come to you in the ballpark, but every engine is different, even two engines built with the same parts. (this may be his problem) That sets the carb up to a basic tune. like trying to synchronize one of the barrels on a 4- barrel Holley® carb. As mentioned, proper mixture adjustment is key to proper jetting and should be performed first. I have a feeling I'll need to upgrade to the 50cc accelerator pump to help the stumble off the bottom end. Includes 8 pump cams to fine-tune your Holley carb's accelerator pump shot. Or not? (or just buy parts, people at Holley got to eat to). Also, if you order a pump cam kit, you will notice that the cams are double profiled. Same idea for the AFB. I intended to move up to a 4 barrel intake and Holley 390 at the same time. If the accelerator is not working try to start the engine to pump some fuel into the fuel bowl. Quick Fuel Holley - $23. We stock rebuilt boat carbs for Rochester, Holley, MerCarb, Weber, Carter & Solex. The accelerator pump nozzels or "squirters" are sized according to the size of the carburetor. Remove the air cleaner. Depending on the region and time of year, E85 pump fuel can be diluted. Not to mention the response of the double-pumper. Finally, Holley offers an E85 checker to determine the level of ethanol content in the fuel. Sadly Louie has passed/ If you happen to be in the dark about what this is, it shows you the duration and lift of the accelerator pump cam,. Some 1920 carburetors had a glass float bowl and the glass and zinc float bowls are interchangeable. times increase. It sometimes is overlooked when replacing parts. I hooked up a dial indicator and degree wheel to a throttle body and measured all the cams myself. There are two. Both of these models can be single- or dual-feed and units with vacuum secondaries have a single accelerator pump. A large aggressive pump cam will cause the accelerator pump to move a larger volume of fuel with each stroke of the accelerator pump, and of course the opposite is true with smaller less aggressive pump cams. Offenhauser Dual- Port (Q-Jet, tested w/ TQ carburetor) [discontinued]. Shut off the engine. Autolite/Motorcraft. Carburetor Part No. 10% higher volume and pressure than the Walbro 460 pump. If I defeat the spring on the accelerator pump arm so the accelerator pump is *forced* to squirt (which is hard on the diaphragm), and I adjust the accelerator pump cam to its most aggressive position, I an almost get the bog to completely go away. One of the most common ailments is a "bog" after the throttle is winged open under load. Also, if I start out at about 75% throttle, I get no stumblebut still get not great performance off the line. These carb tuning aspects are discussed on our Holley Tuning Tips page. Do your accel pump cam charts show relation to throttle position? The one in the HP Books (also a good Holley Book) only has the total output of each cam. A larger hole will shoot fuel at a faster rate with less pressure than a smaller hole. Throttle Position 41R643 Yellow 41R336 Brown. Selling Wholesale Direct to the Public, plus get an Additional $100 off & Free Shipping through the end of the year. holley carburetor listing and code by minuit10. The link is constructed with a bend in the middle. But I think I see your point. US made, ethanol ready. There's pretty much NO documentation that I've ever found that specifies what the differences between them are. and it takes a special tool with an allen tip on it to get at it its almost impossible to get the left front one in. Three of the systems have replaceable components that allow. Then you need to put in a bigger cam. The cruise mixture on a low boost, mild cam engine would be 1 to 1. When properly installed, the link will resemble the letter "S" if viewed from the front, NOT a reverse "S". If you have a longer duration performance or race cam you may need to change the power valves to handle reduced engine vacuum signal to the carb. It is very easy to test the function of the accelerator pump. They include cams that have a different shape or profile to give different results. The brown is a 50cc pump cam; the chart is for the 30cc pump cams. The Accelerator Pump Circuit contains additional parts to. The Brown 50cc pump cam does pump the most volume but it can only be used with a 50cc pump. I've had stuck floats, stuck accelerator pump arms, leaks, etc. Accelerator pump cams on Holley carbs can be swapped out to deliver advanced or delayed accelerator pump delivery depending on your engine's normal idle speed. p holly carb,holly mech. If you decide to go with the Holley, shoot me your engine specs and I'll send you the jet, nozzle, accelerator pump numbers that will get you real close and save you a bunch of R&D time and money. Includes 8 cams for 4150 four barrels and 2300 two barrels with 2 screws. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35. Including the graph on Holleys own website and in their catalog This one seem accurate and in accordance to my personal measurements and experiments. Not sure I typed that too well so here is another explanation I grabbed form MorTec. Accelerator Pump Circuit. Kit includes a helpful tuning chart to assist you in selecting the appropriate accelerator pump cam;. In any given cam there can be multiple mount holes to give a little more adjustability as to when and how much fuel will flow. but i cant get rid of this off idle bog. installation kit with twin weber 32/36 dgev (electric choke) carbs on mercedes benz with 35/40 zenith carbs. 600 0 10 20 30 40 50 60 70 80) Throttle Rotation (Degrees) Pump Cam Lift vs. A one stop shop for all your engine rebuilding, customizing and racing needs from safety equipment to timing and set up gear. It is there for engines that need the throttle idle position to be slightly open due to large cam overlap, mainly for race type conditions where idle RPM's may be 1200-1500 rpm. A larger hole will shoot fuel at a faster rate with less pressure than a smaller hole. Accelerator Pump Cam Kit by Moroso®. Cam Kit #20-12 has a variety of cams to tailor your vehicle’s idle-to-main circuit transition. As mentioned, proper mixture adjustment is key to proper jetting and should be performed first. Depending on the region and time of year, E85 pump fuel can be diluted. Nozzle sizes are stamped on each shooter (for example, a 31. accelerator pump Back off the curb idle adjusting screw and open the choke valve so that the fast idle cam allows the throttle valves to be completely seated in their bores. Reply flowed heads, EFI cam, Edelbrock 1403 on JWR manifold, new distributor with RPI ARP Amplifier, ARP mains studs and a Cloyes roller timing chain set. what are the possible problems to a 1978 ford f100 351 v8 m 2 barrel carb bogging out when pressing the gas pedal and dying unless you take your foot of the gas? It isn't the fuel filter I just recently replaced it. 6% CO (12 to 1 air/fuel mixture) is used on most engines, yet you can go richer if needed to help control detonation. After messing around with all the pump cams i had (pink, orange, and green)i have found that the accelerator pump adjustment bolt and spring was set too tight from the factory. - -----Original Message----- >a bogging holley does not necessarily need bigger jets it probably needs a >larger discharge nozzle >(squirter) for the accelerator pump or it needs a pump cam or cam adjustment >there are two positions for these and many different cams as well as if the >carb is a double pumper or vacuum secondary there are many. Your vehicle's mechanical fuel pump is a fairly reliable piece of low-tech equipment. Continues to flow high volume even at 120 PSI. All products containing or displaying the trademark brands are licensed through their respective manufacturer. The easiest and most common is the accelerator pump linkage. The accelerator pump combats this lean condition by squirting fuel until air speed and carb signal picks up again, easing the transition between light and heavy throttle. Designed using state-of-the-art technology and with customers in mind. If you're not experiencing any pinging or detonation issues now, you might also try a couple degrees additional ignition timing to help get rid of the hesitation. & Screw Mount (1) First, perform the various engine tests & adjustments; Compression, Points, Timing, Vacuum, etc. Alternatively Gary Sypherd reports that an easy way to seal the accelerator pump is the Edelbrock Marine Accelerator Pump Kit part #1471. The Baja 1000 is probably one of the most abusive endurance races to compete in for an engine. AED HOLLEY ACCELERATOR PUMP CAM ASSORTMENT 5560 AED Performance pump cam kit offers a wide selection for tuning the accelerator pump circuit. Holley Accelerator Pump Cam Chart. I tried to come up with something in the mi ddle. 1994 Pontiac Firebird - Roseville, MI For $3,950. The brown is a 50cc pump cam; the chart is for the 30cc pump cams. They include cams that have a different shape or profile to give different results. Holley has been the undisputed leader in fuel systems for over 100 years. The metering block contains the main metering jet and accelerator pump check valves. 49 Trending at $7. A Q-Jet, when set up with the correct metering rod for cruise & idle, will produce a slight hesitation upon acceleration if the accelerator pump is disconnected. The accelerator pump nozzels or "squirters" are sized according to the size of the carburetor. Shut off the engine. If a double pumper, make the primary acc pump cam work faster. You can try different pump cams to lengthen or shorten the shot or you can put a bigger accelerator pump on it, different squirters, etc. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. How did you set your float?. pump cams, Holley jets, and Holley power valves. For a Holley style carb, it sounds like you need a larger accelerator pump squirter and/or different accelerator pump cam. Utilizing this chart will help you determine the. A large aggressive pump cam will cause the accelerator pump to move a larger volume of fuel with each stroke of the accelerator pump, and of course the opposite is true with smaller less aggressive pump cams. My guess is that I'll probably 11-12 psi? vacuum. Connector pigtail assemblies to replace original General Motors (GM) vehicle and engine wire harness sensor connectors. Install the accelerator pump spring, diaphragm, cover and screws. Not to mention the response of the double-pumper. I have plenty of different color cams but no chart. 035" was the one that worked. & Screw Mount (1) First, perform the various engine tests & adjustments; Compression, Points, Timing, Vacuum, etc. How Do You Read the Model Number of a Holley Carburetors? Determine the model number of a Holley carburetor by locating its list number. The accelerator pump squirter is in between the primary bores and have a port that discharges fuel into each of the primaries. Here you'll find AED kits, fuel floats, needles and seats, power valves, and more!. It is there for engines that need the throttle idle position to be slightly open due to large cam overlap, mainly for race type conditions where idle RPM's may be 1200-1500 rpm. ACCELERATOR PUMP CAMS AND SHOOTERS Accelerator pump cams come in various sizes and are color coded and number coded by Holley. IT IS NOT A. Any stock Quadra jet ( choke plate may be removed ) or Holley 4412 with Mr. 49 Trending at $7. Part# 120077. AED HOLLEY ACCELERATOR PUMP CAM ASSORTMENT 5560 AED Performance pump cam kit offers a wide selection for tuning the accelerator pump circuit. 035" Accelerator Shooters (Secondary) Red cams #1 hole in #1 position : Manifold:. Holley makes a pump cam kit, with a variety of color-coded cams for different pump shot curves and amounts. What I don't like about the Summit Carburetor: They advertise it as fully tunable, with changeable air bleeds, pump nozzle restrictions, Holley acc. 025 accelerator pump nozzle-Quick Fuel Technologies secondary diaphragm housing I got it used and rebuilt it when I rebuilt my engine ~5 or 6 years ago. For 20 years, I had heard that these carbs had a huge flatspot so I am surprised that people are still trying to make these work. When the throttle is closed, the diaphragm return spring forces the diaphragm toward the cover, drawing fuel into the chamber through the inlet. This accelerator pump cam assortment kit allows you to tailor accelerator pump performance to the engine's actual requirements. 7) Carter Only. Before you get started, I recommend that you buy a new set of spark plugs (or two) a Holley Jet Assortment kit, a set of reusable bowl gaskets (so you don't have to replace gaskets every time you change jets) and once it's baselined, an accelerator pump cam assortment and a few power valves in various sizes will come in handy! That stuff will. Here you'll find AED kits, fuel floats, needles and seats, power valves, and more!. installation kit with twin weber 32/36 dgev (electric choke) carbs on mercedes benz with 35/40 zenith carbs. The colored charts (Figs. Holley 121-7 Accelerator Pump Discharge Nozzle. If you decide to go with the Holley, shoot me your engine specs and I'll send you the jet, nozzle, accelerator pump numbers that will get you real close and save you a bunch of R&D time and money. Holley Carburetor: Idle and Transition Circuit Calibration Guide July 27, 2015 by Muscle Car DiY At the risk of sounding repetitive, let me say once again, that if you bought an application-specific carb, you probably are only going to need to do minimal adjustments to mixture calibration. The total lift of the pump cam is what determines the amount of fuel dispensed in one stroke of the pump. Note: Brown pump cams only have one index hole and are used on 50 cc accelerator pumps and various other pump cams have three index holes. Order Carburetor Accelerator Pumps for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. In any given cam there can be multiple mount holes to give a little more adjustability as to when and how much fuel will flow. You can find all the Holley technical videos, as well as some pretty fun videos of Holley events, dyno runs and interviews, at HolleyTV. (this may be his problem) That sets the carb up to a basic tune. ” {ad:BLOCK}. John - no, I'm running the factory MC2150, but you'll find most carbs of this type (fixed jet and venturi - Holleys, Webers, MC2100/4100, lots of others) work the same, and the 2150 was apparently connected somehow to Holley, as it uses similar PV and accelerator pump designs. all 3 of the 4180s i have floating around were previously tampered with. Throttle Position 41R643 Yellow 41R336 Brown. I understand that this carb may be a bit big, but it was. The big four suppliers of 4 barrel carburetors today are Edelbrock, Holley, Quick Fuel and Barry Grant, each of these. Those "check balls" are directional, one was in upside down. Cliff's High Performance Quadrajets - Quadrajet rebuild kits, tuning & Carburetor restoration services for Rochester Quadrajet repair, kits and parts. Sometimes with certain changes made to an engine such as cam, headers, etc a step up in jets (richer) may be needed. If you're up at 40 with a typical orange pump cam and it's still stumbling I'd first check your accelerator pump linkage adjustment. " Carb Sizing A quick Google search will find several formulas that recommend a specific carb size based on factors such as engine displacement and rpm range. Calibration of the accelerator pump system is not only by means of jets to control the rate at which the fuel goes in. This accelerator pump cam assortment kit allows you to tailor accelerator pump performance to the engine's actual requirements. Notice: Undefined index: HTTP_REFERER in /home/forge/carparkinc. They are available in a kit, part number 20-12 pictured below. accelerator pump Back off the curb idle adjusting screw and open the choke valve so that the fast idle cam allows the throttle valves to be completely seated in their bores. This is info supplied by Holley. Holley carburetor accelerator pumps further holley carburetors accelerator pump lever holley carburetor accelerator pump adjustment holley carburetor adj holley carb. Below that is a 30cc pump. I have some accelerator pump cams already. The Accelerator Pump Jet has a very small aluminum washer fitted to ensure a correct fit. accelerator pump discharge restrictions that are to large. Should see fuel out the squirter at lightest touch of the throttle. but i cant get rid of this off idle bog. It had too much tension on the pump lever and was starting out already in the stroke of the pump when the peddle was pressed. Order Holley Carburetor Parts & Components for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. This is remedied by the use of a small piston or diaphragm pump which, when actuated by the throttle linkage, forces a small amount of gasoline through a jet into the carburetor throat. ” {ad:BLOCK}. PitStopUSA. Holley 1850 rebuild Tips and Tricks. It is very easy to test the function of the accelerator pump. The Holley 1920 carburetor is a one barrel downdraft carburetor with an aluminum throttle body, zinc float bowl and metering body. Carb Sizing. For low-RPM wide open throttle you can drill out the pump nozzle (and lower the level pin to compensate). Each camshaft has a different shape or profile to give different results and the camshaft lift directly affects the accelerator pump stroke and pump capacity. General AFR Guidance (Holley Tuning) chart available that shows the difference in accelerator pump cams? I found a few online, but they all seem different. Not sure what the squirter size is either. More likely accelerator pump arm and cam not adjusted correctly, power valve too high, idle transition circuit not working correctly because the butterflys are open too far on the primaries, just for 3 possibilities if it's a Vacuum. The system also uses various springs, cams, and diaphragm sizes to control the amount of fuel injected by virtue of the duration of the injection phase. Order Holley Carburetor Parts & Components for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 035" was the one that worked. The accelerator pump is linked to the throttle linkage and squirts a small amount of fuel into the engine when the throttle is being pressed and there are 3 things to tune it on the 5200. 66-51 idle adjusting screw spring id. Do your accel pump cam charts show relation to throttle position? The one in the HP Books (also a good Holley Book) only has the total output of each cam. The same applies to the accelerator pump cams. Marine Rochester. Although Holley makes choosing carbs appear easy in the. Description Accelerator Pump Cam Assortment. Fortunately, replacing a broken fuel pump is a fairly simple task that you can accomplish at home in about an hour or two. 66-51 idle adjusting screw spring id. Throttle Position 41R643 Yellow 41R336 Brown. pump cams, Holley jets, and Holley power valves. Marvel-Schebler. As the throttle is opened, especially at low rpm, air velocity through the carburetor drops and the mixture naturally becomes leaner. We tear down and analyze a small-block Ford that completed the journey, with some parts failures along the way. The two generations of carbs - Before 1989, virtually all pwc's utilized the "round pump" Mikuni carbs. com/public/yb4y/uta. Re: Holley 2300 accelerator pump help I have seen that on more than one post right here on this board. The Accelerator Pump Jet has a very small aluminum washer fitted to ensure a correct fit. These color-coded springs are also available from speed shops (along with various sizes of accelerator pump nozzles). Switch to the Screamin' Eagle part, or route the vent hoses up under the gas tank, then down to under the battery. Re: Holley accelerator cam and nozzle questions May 28th, 2013, 04:53 PM I put 2 little washers on the adjustment bolt of my 670 right under the hole from the arm, it seems to make the contact with the pump arm better,more exact since its kinda sloppy,I used the green pump cam in the #1 hole and a 31 squirter ,works good now. The nozzle hole size determines the rate of fuel discharge. anybody??. Check that each carb opens at the same time and will reach full open at the same time. holley 4000 64-32 leather pump assembly 90-10 see jet chart at end of holley section cam 85-472 30cc plastic pump arm g1717 nozzle bar. I hooked up a dial indicator and degree wheel to a throttle body and measured all the cams myself. Other Rochester Carbs. The chart below shows the differences in rise of lift on the varying accelerate pump cams. Choosing Gasoline for Early Engines by Jim Clark, Hot Rod M. Accelerator Pump cam: varies. The Ford Cologne 2. I think the circuit also suffers from drain back. C1 & C2 Corvettes - Confusion in Tuning the Holley Accelerator Pump Cam - When you look through Holley literature and videos regarding tuning the accelerator (squirter) pump cam, most say to use Position 1 (smaller squirt later) for heavy cars and Position 2 (bigger squirt earlier) for a light car. Below you will find a chart and graph that illustrate the lift of each colored accelerator pump cam at various degrees of throttle rotation. Over carburetion or a non-functioning accelerator pump will pretty much have the same effect, the car may indeed 'fall on its face'. The hole size determines the rate of discharge. In the days of `57 ford 312’s and `60 Dodge 383’s the purpose was for a summer and winter setting of the accelerator pump. 00 shipping. It had too much tension on the pump lever and was starting out already in the stroke of the pump when the peddle was pressed. The 650s if I recall usually have a 20-30cc pump, so you need the 20-30cc pump cams. Test the pump before putting the top back on. Try different shooters and cams until you reach the fastest 60ft time. Rochester Quadrajet accelerator pumps have a plastic end which is often broken or damaged. so i was never able to get a proper count. By changing the size and shape of the arc on the cam, the pump shot can be tailored to start early or later as you go from off idle to full throttle. If the main jet doesn’t solve it, try the pump. How did you set your float?. The accelerator pump circuit illustrated is a means of compensating for fluctuations in fuel demands during acceleration. Something along the lines of what is on Holley's site, but one that is accurate and not full of errors lol. The TV cable management process starts at the vehicles accelerator pedal. The holley's a 670 cfm and I am running a 302. holley 4000 64-32 leather pump assembly 90-10 see jet chart at end of holley section cam 85-472 30cc plastic pump arm g1717 nozzle bar. Holley Carb Accelerator Pump Squirters Nozzles Cams Adjustment Tutorial Overview http://www. holley carburetor listing and code by minuit10. The #1 & #2 refers to the holes in the throttle lever for the screw that attaches the cams, positions 1 and 2. The secondary spring is the "black" spring. Although Holley makes choosing carbs appear easy in the. How did you set your float?. The cam profile does not make a difference if you mash the throttle, just the overall lift. The Most Trusted Name in Carburetors Since 1954. Each cam has a different shape or profile to give. In fact I'm not sure they came with the cam kits. Check that each carb opens at the same time and will reach full open at the same time. As the accelerator pedal is depressed, a mechanical connection (Typically a cable) is connected to the engines carburetor or fuel injection systems throttle linkage. How to Replace Your Car's Mechanical Fuel Pump. Hey Veepster. Holley offers an assortment of. Which type of discharge nozzle do you use in your Holley? I have a lean condition off idle when cracking open the throttle, and know I need to increase my discharge nozzles. I am using the stock ECU from the LS1 2002 Camaro, with the 24-58 reluctor converter, injector adapters and needed sensor conversions, Texas speed and performance has done the basic tune. That's what I did. Note: This is only a rough estimator of carb sizing. Ideally, I would like to see lift versus. See attached chart and graph. The stupid thing is that this was a clean-sheet design, where they could easily have used a Holley-style diaphragm pump that's tried and proven. We are the premiere place for 1st gen and 2nd gen Dodges as well as a great source for newer models as well. I've noticed a lot of questions lately about pump cams on Holley carbs. Not sure I typed that too well so here is another explanation I grabbed form MorTec. In fact I'm not sure they came with the cam kits. As the accelerator pedal is depressed, a mechanical connection (Typically a cable) is connected to the engines carburetor or fuel injection systems throttle linkage. The accelerator pump circuit illustrated is a means of compensating for fluctuations in fuel demands during acceleration. Crane Engine Parts March Billet Pulleys Engine Parts Comp Cams Engine Parts Valve Lash Adjustment Chart Decal Top Dead Center Holley Accelerator Pump Nozzles. These simple changes improved the fuel mileage by over 30 percent. This accelerator pump cam assortment kit allows you to tailor accelerator pump performance to the engine's actual requirements. [4] At the top is a stock 50cc accelerator pump. If a double pumper, make the primary acc pump cam work faster. Replace the float bowl, carefully placing the accelerator pump rod into its rubber boot. When you take the carburetor out of the box, this screw, which is located on the throttle shaft. The power valve operates separately and provides additional fuel when you're still in the throttle after that initial burst. Look,,, most all carbs have an accelerator pump, including the Q-jet. I hooked up a dial indicator and degree wheel to a throttle body and measured all the cams myself. 6% CO (12 to 1 air/fuel mixture) is used on most engines, yet you can go richer if needed to help control detonation. Boy do i feel like a dodo. 2 product ratings - Holley AED QFT CCS 4150 4160 Carburetor Blue Accelerator Pump Cam 41-234 $7. 11 gears (and street tires), the FIRST 5 feet that the car travels is the most critical. All of these pieces are used to tune the basic Holley carburetor. For Carbed engines, you need to up the size of the jets to flow about 20% more for the primary, and 35% more for the secondarys, and tune from there. Holley 4-Barrel Carburetors - Camaro, Chevelle, Chevrolet, Corvette, Chevy II / Nova 1964-67 Holley Components - 4160 Series (Single Fuel Inlet 585 CFM 275 to 390 HP) 1965-72 Holley Components - 4150 Series (Dual Fuel Inlet 780-855 CFM 375 to 450 HP). Utilizing this chart will help you determine the. the PO had it tuned for 3500 above sea level. Designed using state-of-the-art technology and with. Quick Fuel Holley - $23. Holley Accelerator Pump Cam Chart. Hg, "85" indicates 8. CAM KIT - accelerator pump, on throttle shaft arm, allows custom tailoring of accelerator pump response (8 different. Includes 8 pump cams to fine-tune your Holley carb's accelerator pump shot. I understand that this carb may be a bit big, but it was. accelerator pump accelerator-pump adjustment air bleed air cleaner airflow airhorn assembly big-block bimetal booster buretor carb carbure carburetor changes Chevrolet Choke housing choke plate Choke rod cylinders discharge nozzle dual-plane emission engine exhaust Fast idle cam filter flange float Ford four-barrel fuel bowl fuel flow Fuel. Below is a list of different pump cams sized from smallest to largest by pump shot capacity in relation to index hole position. Holley 750 Vac Secondary Accelerator pump Cam Hi Everyone Playing around trying to tune up my carb and I noticed the accelerator pump spring is pushing down a fair bit on the diaphram actuator. holley carburetor listing and code by minuit10. Shut off the engine. We are the premiere place for 1st gen and 2nd gen Dodges as well as a great source for newer models as well. The way to check for this problem is to remove the air cleaner and operate the throttle a few times to see if the accelerator pump is working. What I don't like about the Summit Carburetor: They advertise it as fully tunable, with changeable air bleeds, pump nozzle restrictions, Holley acc. Holley Carburetor: Idle and Transition Circuit Calibration Guide July 27, 2015 by Muscle Car DiY At the risk of sounding repetitive, let me say once again, that if you bought an application-specific carb, you probably are only going to need to do minimal adjustments to mixture calibration. 4150 carb types use a rear metering block with jets similar to the front metering blocks. Equip cars, trucks & SUVs with Accelerator Pump Nozzle from AutoZone. When the throttle is closed, the diaphragm return spring forces the diaphragm toward the cover, drawing fuel into the chamber through the inlet. Once a pump nozzle size selection has been made the accelerator pump system can be further tailored with the pump cam. Silvester V8 Performance has a proud history supplying American V8 performance engine parts and racing equipment for the NZ market for over 40 years. accelerator pump discharge restrictions that are to large. Advice on affordable parts? (accel pump squirter tubes, jets, etc. AED HOLLEY ACCELERATOR PUMP CAM ASSORTMENT 5560 AED Performance pump cam kit offers a wide selection for tuning the accelerator pump circuit. These two charts show the lift profile of the various Holley fuel pump cams when located using hole 1. ACCELERATOR PUMP Mikuni’s HS40 carburetor is fitted with an accelera-tor pump. Or not? (or just buy parts, people at Holley got to eat to). Part# 5560. This cam can be used for tuning the pump duration on any 4160 or 4150 Holley carburetor. Each Holley power valve is stamped with a number to indicate its vacuum opening point. This accelerator pump cam assortment kit allows you to tailor accelerator pump performance to the engine's actual requirements. 040, as recommended by Holley. The nozzle has two holes, one for each barrel of the primaries that squirt down the primaries as they are opened. General AFR Guidance (Holley Tuning) chart available that shows the difference in accelerator pump cams? I found a few online, but they all seem different. The following is a partial list of Holley list numbers for some of their most popular carburetors. Marine Rochester. Holley carburetor accelerator pumps further holley carburetors accelerator pump lever holley carburetor accelerator pump adjustment holley carburetor adj holley carb. Order Holley Carburetor Parts & Components for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. A holley will do the same thing, maybe a minor tweak on the accel pump shooters or cam, or vacuum pod spring, but in general minor tweaking. Accelerator pump cams on Holley carbs can be swapped out to deliver advanced or delayed accelerator pump delivery depending on your engine's normal idle speed. The Renew Kit is the 37-1536 (Holley official rebuild kit; it covers this & similar carbs) The Trick Kit is the 37-933 (contains most everything to rebuild the carb, plus some extra power valves, nozzles, pump cams, etc. Hi, does anyone happen to have a chart that tells which color holley accelerator pump cam is (the plastic cam) the least aggresive to most aggresive? I currently have a green cam installed in the #1 hole and would like to try the next one, which is more aggressive. Selecting and Torquing Nuts and Bolts by Jim Clark, Hot Rod M. More likely accelerator pump arm and cam not adjusted correctly, power valve too high, idle transition circuit not working correctly because the butterflys are open too far on the primaries, just for 3 possibilities if it's a Vacuum.