Oil Pumpage

[Paul Perreca]

Rebuilding the motor w/ an H/C/I combo, smart to get stock oil pump (at this point i dont have one at all, refuse to use my old one w/ 110k on it) OR ge the HIGH VOLUME oil pump from jegs or my parts dealer..... !
Paul Perreca

 

[Paul Perreca]

this is important lol
Pauly

 

[87GTSnake]

I would go with a standard melling oil pump and pickup. Summit has them pretty cheap.

 

[jerryD]

melling M-68 is all you need for a 302. parts stores have 'em.

 

[vristang]

I went with a high volume just because it was on the shelf at the store.

I am not sure I can notice any benefit, but in theory it does provide more resistance than the stocker which means less power to the wheels.

Very smart to not reuse the old pump. That bit me in the @$$ a year ago, even though the pump only had about 2500 miles on it.

 

[Paul Perreca]

so basically dont even worry about it and just get a new stock one, and the sentence,
I am not sure I can notice any benefit, but in theory it does provide more resistance than the stocker which means less power to the wheels.

seems like your saying the high volume one creates more resistance, and will actualy give less power to the wheels than a stock one, so a stock one is better, i dont know if I made the correct sense of that...
Paul Perreca

 

[DMAN302]

Stock is your best bet...by that I mean new unit...not your old one..sorry but want to be clear.

 

[Rick 91GT]

No need for anything but a stock pump in that motor, as stated your local parts store has them on the shelf in many cases. I do like upgrading to a FMS, Probe or ARP pump shaft.

 

[vristang]

so basically dont even worry about it and just get a new stock one, and the sentence,
I am not sure I can notice any benefit, but in theory it does provide more resistance than the stocker which means less power to the wheels.

seems like your saying the high volume one creates more resistance, and will actualy give less power to the wheels than a stock one, so a stock one is better, i dont know if I made the correct sense of that...
Paul Perreca

I'd say you pretty much got the point, even though I didn't explain it well at all.

The high volume pump pushes more volume at the same pressure. Most agree that this is unnecessary for all but extreme builds. The high volume pump does suck more power from the motor due to the increased volume, but the benefit is the increased volume capacity. I don't think the price difference is very much if even mentionable.

Just have to decide if the pros are worth the cons.

 

[Paul Perreca]

the reason for this thread was that the CRATE MOTOR out of california mustang (or somethin) had the gt40 heads, and the motor was only supposed like 300 horsepower, but in the engine comes the HIGH volume oil pump, i didnt know whether all rebuilds should have it beings this motor they sell is not at all EXTREME... I just wanted some clarification, the price doesnt matter cuz its the heart of my engine, just want my heart to be strong ya know - but if stock is strong enough, well than stock on man!!!!!!!!

 

[crazypete]

The high volume pump wont help you unless you open up the oil passages in the entire motor a bit. Otherwise, the HV pump will draw all this HP to pump all this extra oil and the oil meets this massive resistence right away. These pumps have a pressure relief valve, I'm pretty sure, so all that extra oil is basically going out the side of the pump back into the pan.

 

[Paul Perreca]

yea but the block is bran new, you mean machining the oil passages?? Cuz there is nothing in this motor at all, clean as a whistle - bran new block i mean

 

[crazypete]

No I mean the factory oil passages are too small to make use of a HV pump.

I think they "chamfer the passages" or something like that to prepare the oiling system for high flow.

 

[vristang]

No I mean the factory oil passages are too small to make use of a HV pump.

I think they "chamfer the passages" or something like that to prepare the oiling system for high flow.

I can't say for sure, but my thought is that the passages would not be the restriction point, but rather the clearances between the crank and bearings, and between cam and bearings, etc.

Just my thoughts.

Either way the HV pump is probably not worth the hp loss. I am questioning my use of it, but I felt I would have enough power to be able to make that sacrifice.