Mattax
Just the facts, ma'am
On that basis there's more power lost opening one valve!
HP Loss from Mechanical Fuel Pump
- Thread starter 72DMag
- Start date
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Get a washer bottle foot pump.
Rat Bastid
Dunamis Metron
It might, maybe, oil possibly cost 1 hp. Maybe. The only way to know for sure is to measure it on an accurate, repeatable (at least repeatable) engine dyno.
furrystump
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If the car sits for any length of time the electric pump is worth it. You don’t have to crank it over forever because the fuel has evaporated out of the bowls. I picked up 1.5 tenths during a run. It threw the belts off going by the tree. Heard them fly under the car and the steering gets loose when you lose the power steering belt. Learned another thing, shut it down and rolled to a stop on the return road. It was 205 deg’s. Opened the hood and spun the fan by hand. One of those flicking the tie down strap kinda things before you go anywhere. Temp dropped to 180!! Surprised how quickly it dropped by spinning the pump a bit by hand.
Scody21
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Whatever HP gain you might get from going electric, losing an alternator your just canceling out with the belly bloat with the 2nd battery weight… And if street used, running an electric water pump is asking for headaches…
72DMag
Well-Known Member
Not sure where everyone thinks I'm running an alternator? I'm not!! I see the one post about the alternator switch. Cool idea but I'd rather just charge the battery at the track.
The goal is to take as much load off of the 318 engine to gain the hp. If this was a 360 or big block I wouldn't worry about these little things. But given what this 318 is I do think every little thing the motor doesn't have to power will add up.
So to recap:
No alternator
Electric water pump
Electric fan
Electric fuel pump
Red top optima and battery charger
Goal is to hit 380hp with this little 318
The goal is to take as much load off of the 318 engine to gain the hp. If this was a 360 or big block I wouldn't worry about these little things. But given what this 318 is I do think every little thing the motor doesn't have to power will add up.
So to recap:
No alternator
Electric water pump
Electric fan
Electric fuel pump
Red top optima and battery charger
Goal is to hit 380hp with this little 318
Last edited:
72DMag
Well-Known Member
@furrystump Good point about car sitting! The way gas is going this year car will go out less thab usual! Thanks everyone
All I can say is I had about 350 hp. I removed the mechanical fuel pump and my HP fell to zero.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
It was something I seen on IG.
You saying 1 hp and pumping by hand made me think of it in regards to that x rpm.
The skit goes... the guy designs an arm for amputees and in the midst of demonstrating it ...accidentally hits his own "custom" program button.
"Custom" ....well we know what that program was for. LMAO
MOPAROFFICIAL
If it has tits, it's a liabilititty.
At least theres 'some' inertia with the pulley..as opposed to a water pump.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
I suspect people are just going to have to find ways to make a few more horsepower to get over that fuel pump drag.
In other words I wouldn't worry about it unless it was a slant 6 or something which I did run an electric pump on with this very idea 28 years ago.
Of course someone could come up with a gravity fed system with a fish bowl on the roof if it really eats them that much..lol
In other words I wouldn't worry about it unless it was a slant 6 or something which I did run an electric pump on with this very idea 28 years ago.
Of course someone could come up with a gravity fed system with a fish bowl on the roof if it really eats them that much..lol
It's just not a concern to me. lol
MOPAROFFICIAL
If it has tits, it's a liabilititty.
He could have said he was a framer...but the wrist n grip was all wrong.
lolHe could have said he was a framer...but the wrist n grip was all wrong.
Was that the GI Joe Kung Fu grip?He could have said he was a framer...but the wrist n grip was all wrong.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Time for rotary engine
Mattax
Just the facts, ma'am
You expect everyone to read what you typed before replying?
I've hung a fuel can from the coat hanger. Actually worked pretty good for getting around town. LOL
No high speed driving with the hood only held with the secondary latch!
I've also gone through the lights with the fuel pressure showing zero for pretty much all of 3rd gear. I could tell the bowl was running out but it made it. Not my brightest move.
I think that his combination is off. He's got a 650, he wants to use a air gap intake manifold, has a xe268 cam and spring's. Now for what's really going to cost him more power than a fuel pump ever will and that's the restrictive cylinder heads that he has, "302" heads with stock size valve's, those heads have around a 150cc intake runner size at best. I'm surprised that no one else caught this and no mention of a compression ratio either.
Rat Bastid
Dunamis Metron
The alternator takes almost nothing to run. You’ll lose power giving it up because the voltage will drop. You are stepping over a donut to pick up a dog turd.
Those heads are keeping you from getting the most out of your cam. Those heads are okay for a mild build but not for what you are wanting to doWe are running comp cams XE268H. Valves r stock size in the 302 swirl port heads.
I have a couple electric fuel pumps laying around so cost isn't the issue but If I get 5hp sounds like it would be worth it. Honestly shocked if it adds up to even 3hp but couldn't find any evidence to verify. Thanks for all inputs already fellas!!
The voltage comment is pretty much what I said earlier, I'm glad that someone with more experience agreed with me
33IMP
Well-Known Member
I have done the save-all-the-parasitic-drag-you-can routine. Ran an electric water pump drive, electric pusher fan, no alternator, etc. I found that having the car coming back up the return road overheating, the battery needing charging, AND still running the fan, was nowhere near worth the hassle.
I now run a mechanical fan and water pump and alternator. Still have the pusher in place, but rarely need it. I figure I'm giving up 20hp with the fan, maybe 5hp with the water pump, and maybe 2hp with the alternator.
Driving back the return road at 170° instead of 220°, with the battery at 14.5v instead of 10.9v, and the car ready to hot lap is worth more TO ME, than that 25 or thirty hp. It's a brackett car. The way it works is MUCH more important than how fast it is.
I now run a mechanical fan and water pump and alternator. Still have the pusher in place, but rarely need it. I figure I'm giving up 20hp with the fan, maybe 5hp with the water pump, and maybe 2hp with the alternator.
Driving back the return road at 170° instead of 220°, with the battery at 14.5v instead of 10.9v, and the car ready to hot lap is worth more TO ME, than that 25 or thirty hp. It's a brackett car. The way it works is MUCH more important than how fast it is.
Contact 318willrun, he has tons of information and knowledge about making a 318 run. If you have a decent size radiator a quality electric fan probably would help.
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