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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi 50cc pumps on Holley 4150 carburetorsGo | New | Find | Notify | Tools | Reply | |
| 50cc pumps on Holley 4150 carburetors | Login/Join |
| DRR Trophy |
Any experience? using 50cc pump on primary side? 850 and up carbs. Before I try it. | ||
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DRR S/Pro |
On alcohol, yes I do. Tony Leonard | |||
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| DRR Trophy |
yes on alcohol added them to my 750s on tunnel ram been on there 5 years it took away the stumble on when you mat it on the line The difference between ignorance and stupidity. Ignorance is lack of knowledge. Stupidity is the inability to learn. Don't be stupid | |||
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DRR S/Pro |
Why? My understanding is the bigger pump gives you a longer pump shot and the squirter gives you a bigger pump shot along with the cam. My alcohol carb has 30cc pumps but the squirters have been drilled out, can't remember the size but it's big from Rupert.This message has been edited. Last edited by: Eman, | |||
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| DRR Pro |
50cc pumps have always worked great for me. Especially when the carb is actually too large for the application and you have a big hole to cover up on the initial hit. Take care. Tom Worthington If it seems that bracket racing has gotten too expensive for you, maybe you are just doing it wrong. | |||
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| DRR S/Pro |
I think the question to be answered is, do you need it? More isn't always better if all is working well. But if what you have isn't working, and I suspect it is not, it's a tool you can try. I've used 50cc's on different occasions with success. Illegitimi non carborundum | |||
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DRR Top Comp |
That is it many on gas do not need it when tuned right or use it as a crutch to cover up tuning issues. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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DRR Pro |
i used 50cc on front and back on 4150,s footbraking and sg racing and had excellent results on gas . | |||
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| DRR Top Comp |
50cc, if ya got low signal. Put a roller camshaft, that'll fix it. Or just put a Reher Morrison shear plate on it.  | |||
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| DRR S/Pro |
Why are you asking!!!!!!!! Probably no reason to do this. | |||
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DRR Pro |
One thing you can be sure of - the combination will tell you what it needs/wants. Listen to what it tells you! Matt Ward | |||
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| DRR Trophy |
This is not my personal problem. I run a 4500 Doninator on my 468 similar engine, but have a good friend that is determined to run a 4150/950 80496 and seeing my performance would like to achieve the same by making them similar. His car leaves like a snail. Granted he is now trying different converters and maybe there could be a another problem that he needs to be address, but the 50cc pump could? help. Was hoping there would be more racers that use the big pump, but it seems that's not the case. He will try and see if it makes a difference. Thanks for your input. Bob Richmond | |||
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| DRR S/Pro |
It's not the accel pump causing his issue unless it bogs when he goes WOT. The it could be that or the size of the squirters causing a bog. Otherwise it's in the combo! | |||
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| DRR S/Pro |
What size squirters and what pump ams are on the carb now? Squirters are simple bigger number more fuel. Cams have different profiles if you do the google there's a graph of the different cams by color by how quickly they deliver the fuel. | |||
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| DRR Elite |
this for over 25 years https://youtu.be/rbKYio6OvKM and still now top bulb and throttle stop racing. | |||
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| DRR S/Pro |
If you are using a transbrake the squirters/accel pump size etc. just allow the motor to get to the launch rpm cleanly, after that they do nothing with regards to on track performance... Foot braking is another story... | |||
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DRR Sportsman |
Same. Much better throttle response off the foot, and quicker 60', especially with a slightly tight converter and/or heavy car. Dan "Jim" Moore Much too young to feel this damn old!! | |||
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DRR Pro |
All of the bigger 4150's I build have the 50cc pump and diaphragm, but use the correct pump cam for the fuel and engine requirements. A green or blue cam on gas is more than enough, if it isn't usually something else is amiss. Bad ignition components, timing incorrect, plug heat range wrong... Also correct primary t-slot exposure can help with stumble issues. And when holes are drilled in the throttle blades it will usually not allow for enough-t-slot exposure.  Mark Whitener RFD Heads FTI Converter Fab Shop Headers Home built 2 circuit Dominator :-) www.racingfuelsystems.com ____________ Good work isn't cheap and cheap work can't be good. | |||
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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi 50cc pumps on Holley 4150 carburetors
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