Hello All,
Does anyone think a mechanical fuel pump will keep up with a 325 hp supercharged slant? I'm trying to keep thngs simple, but don't want to take any chances frying my eng.
Thanks
Mike

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225 m90 supercharger model T roadster project

I am going to say that would be a no! When running forced induction it always takes more fuel per HP than a N/A setup would.


Now that does not mean you might not still be able to get by with it if you work things out right. It might be possible to have a higher performance pump than the stock pump. In fact if there is not a after market pump that could be used there are some models that had 7psi pumps instead of 4 1/2 psi. Too get the full benefit of one of these pumps a proper regulator & return system would have to be used. Also using a Holley 4 barrel with the center hung float bowls will help becuase of the bigger bowls. Plus a 3/8 fuel line would be needed atleast. I do not know if a setup like this would feed your setup, but it is possible. As long as you have good test equipment like wideband O2 system & fuel pressure gauges that can be read from the driver seat while making a pass you will be able to know if the system is holding up to the demand.


IMHO it would easier to just build a good fuel system though. A real quick and easy way of doing it would be to run one of the inline electric fuel pumps that is made for fuel injection. This requires a special regulator that will bring the pressure back down to the carb operating pressure. In reality it would not cost much more to do this than to beef up a machanical system. And it would work much better. I think for around $250.00 you could buy the fuel pump & regulator. This would still need a return line though, and it would need to be as big, if not bigger than the main line.

In the end there is really no easy way to play this game and be sure you dont melt a engine. It is best to build the better fuel system even when cost is greater. You will have enough to worry about even when the fuel system is up to par.


Jess

I think stock pump MAY be OK to 300 HP, and I have run a few 250-270 HP Slants with a stocker, but I wouldn't push it. You will likely burn pistons by going lean.

Lou

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Home of Slant6-powered fun machines since 1988

Jess is right. Now for a few Questions,,,Is it a street car or racing only ?
Let's go back in time to the old Dick Landy/ Ronnie Sox Chrysler seminars when fuel pumps were brought up. mech.pumps push better than pull,,, so a electric pump was put near the tank to keep a supply of pressured fuel to the mech. pump. Carter made(s) a pump that put out about 5 psi so no regulator was used. This was manualy switched on from the driver seat and turned off when not needed. A light on the dash helps to let you know that the pump is on . I did that after forgetting to turn it on at the starting line. This works so well that I still use this set up today on my street cars. In high heat starts a flick of the switch and no more cranking for a minute or more due to vapor lock.This also works great for the short burst on the street as most of the time you run out of road before you hit high gear and spend most of your time running around on the carbs primaries. In a race car the new set ups are far superior and make a manual pump obsolete.