Fuel pump choices?
Good advice from 12many.
Disagree that there are better quality pumps. That thinking might come from the fact the Carter elec pumps are cheaper than most others. They are cheap because the design is incredibly simple, self aligning brgs, only two seals, & they are cheap to make.
512 ci @ 6000 rpm requires about 42 gph [ assuming 80% VE at 6k, & 80% is being generous ] with correct A/F ratio.
The Carter 4600 series are rated at 100 gph, so this would supply more than enough fuel with a very healthy safety margin. You could probably also use the 4594, 72 gph, with free flowing lines & filter.
It makes NO sense using a pump that is larger than needed because the pump just works harder dead-heading against the regulator....& wears out quicker.
Who said dead head a bigger pump? Only you. I won’t dead head ANY pump. It’s a bad policy.
I can tell you that the Carter pump is rated higher than it flows. And your numbers may look good on paper, but in the real world don’t mean a lot.
You have to compensate for plumbing losses, G forces, voltage drops and other things that are real world.
When Steve Morris, who has more Bona Fides in his drawers than you will ever have says you can’t have pushrods too big, too much ignition or a fuel pump that’s too big...well what he says and my experience shows means you are wrong. Again.
BTW, what does cubic inches have to do with your math? more bullshit you post to make yourself look smart.
Does 512 inches at 6000 need more or less fuel than 400 inches at 7500? Answer: displacement doesn’t mean a thing. It’s horsepower that matters. It takes roughly .45 pound of fuel per horsepower per hour. I didn’t see displacement in that equation. That is Brake Specific Fuel Consumption and it’s a measure of how well (or not) an internal combustion engine uses fuel on a dyno. Hence the term BRAKE. It’s measured on a water brake.
That’s why a dyno can easily run an engine making well north of 1000 hp with a relatively small fuel pump. That same fuel pump in the car would be as useless as much of what you post.
You can’t have too much fuel pump.
Dont dead head ANY electric pump.
You can’t get the pump feed or return lines too big, with very few exceptions. One BG pump I know of being an exception.
Simple rules to follow. And I know there are guys running low 10’s on mechanical pumps. That doesn’t make it right. And I’d say it’s wrong.
