BuckeyeROC

What is best for a street and some track driven small block making between 400-450 HP and why?

AJ_92RS

I've heard that you just want to stick with high volume. High pressure robs HP. Although I don't think that high volume is really needed either. The pickup and internals are larger, but if the oil passages and galleries remain the same size in the block/heads, then how is more volume gonna help? Seems to me that it would cause more pressure if those two things are restricting flow.

I dunno for sure. Maybe someone else can elaborate more.

AJ

ede

use a melling M55 with a mr gasket #26 spring and weld a brace on the pick up and bolt it to the pump body. stay away from the high volumn or preasue pumps if you're driving a street car.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

MikeH

iTrader: (10)

I agree with EDE.. I wouldnt use the high volume pump. I didnt some recearch on this and even Lingenfelter says not too use it. It costs power to turn, more oil the rings will have to deal with on the walls of the cylinder. The M55 is all you need, set it up for 10psi of oil pressure for every 1000 rpms you plan to spin the motor. If your not going to spin it past 6000 rpms= 60 psi of oil pressure.

Summit sales a bracket to secure the pickup to the pump if you dont have a way to braze it or dont feel comfortable with the press fit of the stock setup.



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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

RB83L69

High volume pumps are only worthwhile if you have done certain things to the engine to increase it overall oil flow. If you have cross-drilled the crank, grooved the cap half of the main bearings, grooved the rod bearings, drilled the rods for pin oiling, and you're running bearing clearances greater than .003" besides, then you might benefit from one. If your bearings and oiling system are stock, then the HV pump will do more harm than good.

My favorite street pump setup is exactly the same as ede suggests. M55 with Mr G #26 spring.

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"So many Mustangs, so little time..."
ICON Motorsports

jcb999

the main problem with the highvolume pumps, is that they can suck a stock pan dry. You need to make sure you have sufficent volume in the pan and good oil return flow. If you do that, you really don't need to worry about anything other than good pressure.

The old method making a high volume pump, was simply to use a big block pump housing. They have physically larger gears and do take more hp to turn.

Now days, companies make special smallblock housings that have larger internal passages. They really don't take anymore hp than a standard volume and they are more efficent. Speedpro, dynagear (it comes with a hex drive shaft and 3 springs for pressure adjustment) and moroso make such pumps. I really don't think they are needed much.

But, i am going to use one on my new 400 (i am of the opinion that 400s could use more volume bc of their larger mains). I really did not like the way the oil pressure would drop on my old engine after it was fully warm and I don't want to take the chance with this one.