fuel line size/pump size for 600 hp, 10.50 et car?

[mag2555]

This also brings up a question I have as for the need for a one way check valve on the inlet side of the pump to deal with G / launch reactions?
The bigger the ID of the fuel line, the lower the G force level needed to induce pressure drop.

[tenxal]

For a typical carb'd drag race application, 18-20 psi @ the pump outlet with #8 line to a good flowing bypass style regulator and #6 to the carb(s) works well. Mount the regulator as close to the carb(s) inlet as feasible. Bypass from the regulator back to the fuel cell or bypass at the pump back to the fuel cell if the pump design allows. Dead heading into the regulator (no bypass) causes the fuel in the pump to be heated as the pump is just beating on the same fuel. Bypassing allows the unused fuel in the system to return to the tank, thus keeping the pump and fuel cooler and reducing wear on the pump. Bypassing normally results in steadier fuel pressure.

Mounting the pump so the inlet is below and behind the fuel cell outlet is a given, for all the obvious reasons.

[CGT]

This also brings up a question I have as for the need for a one way check valve on the inlet side of the pump to deal with G / launch reactions?
The bigger the ID of the fuel line, the lower the G force level needed to induce pressure drop.

Your sure about that?????

[mag2555]

Yes, my last statement is reversed, sorry!

[CGT]

About which?

The bigger the fuel line, the lower the G force necessary to induce pressure drop

[F-BIRD'88]

Do not confuse pressure with fuel pump motor POWER pumping power.

Re G force imagine a column of liquid that has mass and a bigger column of liquid standing straoght up. 1 G is acting on both...

It takes a more powerull fuel pump motor to lift the column with the bigger mass (weight.).

Fuel pump motor mattets.. Horsepower is a measure of work capacity.


psi is just psi...

[MadBill]

Playing Captain Obvious re backing up F-Bird's first item above: the line diameter is irrelevant to the effects of g forces.

However, the power to lift a given mass per unit time does not vary with the line diameter unless it is small enough to create a substantial pressure drop.

In the same vein, people who should know better (read: fuel log manufacturers) seem to think that a huge log, say 1", diameter is somehow a benefit. Wrong; it does nothing but expose more fuel to engine compartment heat.

[andyf]

I just finished running a 514 inch Mopar engine on the dyno where it made 900 hp. According to the data logger we were using 370 lbs/hour of fuel at WOT. That is just a little over 60 gallons per hour which tells me that you don't need a very big pump to feed 600 hp.

[vortecpro]

From the dyno to the car is a whole different story.

[vortecpro]

So very true-- Twice the number of needle and seats



JOE SHERMAN RACING

Twice the fuel storage as well.

[cjperformance]

So very true-- Twice the number of needle and seats



JOE SHERMAN RACING

Twice the fuel storage as well.

Yes, better bowl recovery , AND more consistent float height to begin with.

[cgarb]

That twin carb set up worked in a drag car true but, would it work on a standing mile car or at Bonneville? 9 seconds wide open really isn't that long.

[F-BIRD'88]

That twin carb set up worked in a drag car true but, would it work on a standing mile car or at Bonneville? 9 seconds wide open really isn't that long.

Yes the fuel pump will move more fuel when working thru 4 needle seats compared to two..

Top speed max top end power is where 2x4's have the advantage.

[F-BIRD'88]

That twin carb set up worked in a drag car true but, would it work on a standing mile car or at Bonneville? 9 seconds wide open really isn't that long.

Yes the fuel pump will move more fuel when working thru 4 needle seats compared to two..

Top speed max top end power is where 2x4's have the advantage.

[cgarb]

OK, say there is 4 holley carbs with 8 needle and seats, all feeding through 1 Holley blue regulator...that is my point, the restriction is not the needle and seat.