possibly fuel distribution issues with front discharge 14-71?

Hello all,

I am new in here and this site was recommended on speedtalk. I am an engine builder and race in the top dog class in Central Europe, basically on pretty unprepped airfields where almost everything goes as long as you are faster......so we do have some rather uncommon engine and suspension setups

Still, we are doing 7's in doorslammers if everything goes well.

I have a question, on my 632 BBC, I have self build EFI setup on top of a 14-71 Littlefield hi-helix with 16x 160lbs injectors which I am running in a semi-sequentiell mode via a Haltech E11v2 EFI. I recently changed from Methanol to race E85 as it is cheaper and easier to get and less hassle to take with you when you have to travel across borders.

At same time I have lowered compression slightly to 9.7:1 and changed over to a rebuild front discharge (delta discharge) Littlefield hi-helix with small inlet. Since I have no injectors in intake at all, could a change from old style big discharge to front discharge cause me any fuel distribution issues in rear cylinders at 25psi boost?

thanks for any help

Heinz

 

A few things come to mind:
1-try and get the a/f mixture in each cyl by moving the blower back (I'm not sure this is possible at all RPMs?)
2-adj. compression ratio's in each cylinder to match the amount of fuel and air they are recieving
3-leave the EFI injectors on top of the blower and run a low volume mechanical system which only feeds port nozzles, this will allow you to even out fuel distribution, basically it would be only the port nozzle portion of a MFI
4-combination of the above