Dual feed VE

[Begle1]

Or, with a good enough auxiliary pump, you can put a pressure sensor someplace and use it to control the pump and maintain whatever case pressure you want.

What I want to do is put a regulator on the case pressure to keep it low. If the timing is kept retarded you can utilize more alcohol; what would happen if I were to put a regulator in there and keep the case pressure at 50 PSI... It'd help keep the rods in one piece. And when not running alcohol, you turn the regulator off.

[Cschafer]

So if you were going to be put a pump straight to the case what kind of pressure would you want. Do you just put the 60psi of the aeromotive in to it with a check valve or do you actually want a 120+ psi pump to keep pressures up no matter what. Where would you hook up such a pump into the ve.

[Begle1]

I know that the case pressure causes up to 6 degrees injector advance; when the pumps flowing a lot of fuel, though, the case pressure can drop. The idea with keeping the pressure high would be to maintain that advance even when flowing fuel.

I don't know what would happen if you tried to get even more advanced timing out of it by increasing pressures beyond stock.

I also don't know if I'd be loosing fuel flow by keeping the case pressure artificially low.

The typical idea floated around is to thread the auxillary fuel feed line into the shut-off solenoid hole, and use the cable to shut if off.

[dpuckett]

With an increase in supply line size, you get an increase in volume at the same pressure. And, you find the cross sectional area of the line by using piR(squared). So, increase your hose size by 35%, nearly double your volume.

I think you run out of advance piston room before you run out of pressure in the case. In other words, you would have to trim your timing piston to increase your timing advance.

DP

[Cschafer]

I'm not looking for more or less advance, P-pumps don't have any and they get the job done. My worry is that with the 14mm and edms I can't supply enough fuel through the inlet to keep the pump cool. Just looking for information really.

[seeker1056]

any decent race type fuel pump can pump 3/4 of a Canadian gallon (1 US gallon) in one minute through a 3/8" line using only 9 psi pressure.

Thats about 60 US gallons per hour at 9psi.

So if these motors at thier absolute fuel hungriest are only using 25 gallons per hour at 15 psi where is the issue for fuel supply?

Is the VE pump got issues inside that preclude or prevent letting in more fuel?

When i had my pump lines apart it was apparent that one could easily make the inlet port at the VE pump larger by a considerable amount just be changing fitting type. Worse came to worse one could make the inlet hole larger and use a larger line , but that wouldtn seem necessary when a 3/8" line at 15 psi is apparrently lots big enough to flow 25 gph.

By the way the inlet fitting is the biggest culprit in any stock pump as it only has a hole slightly larger than 1/8" . Just drillin that out to around 11/32 would increase fuel flow by 50%

The mechanics and the math are there, so what am I missing?
thanx

[fergavs]

I am intrested in getting as much info about this as possible.


As far as feeding into the "out" port on the VE and using a T. What kind of pressure are you setting your pressure switch to start forcing fuel into this port. I assume you wouldnt want it doing this all the time or you would probably over heat the electric pump,no? Also the check valve would be located on the electric pumps output so as not to force fuel back through the pump corect? Now once you start making some power/higher RPM most/all of the regular fuel supply would be used, is this why you can start feeding fuel into this port?

So basically the way I picture this is my piston lift pump would feed the VE normally then my electric pump, pressure switch activated, would start feeding fuel into the "out" port of the VE when the case pressure went up to a certain pre determined pressure. Does this sound right?

At what case presure should my pump turn on(if this is how its done), is it ok to feed into the out port or should a guy feed into the shut-down solenoid hole as mentioned earlier?

KTA,
how about you just sit us all down and lets all have alittle traing session on dual feeding the VE so we all can have over 700HP.

[KTA]

When I figure out how to make a reliable 600+ I will let yall know. For now that realm is plagued with many reliability issues and is best left alone unless your truck is a toy and it doesn't matter if its broken.

[DTanklage]

wait until you see the system i designed for josh ayers...

your gonna sh1t

[Begle1]

And when aer you planning on presenting us with your ocular laxitive fuel system (OLFS)?

[DTanklage]

dont know if you will ever see it...

i picked one guy to help smash all ve records and that is who i picked

tank

[Begle1]

You better hurry up.

I haven't had a normal stool in weeks.

[DTanklage]

you better find some fiber or something...

i dont think he is gonna dyno until nov.

[KTA]

dont know if you will ever see it...

i picked one guy to help smash all ve records and that is who i picked

tank

Good I have been needing some motivation to dust off old yellow.

[DTanklage]

lol

i dont think you ought to be worried kta...

josh's truck only has one turbo on it

don

whats your name anyways?