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Author Topic:   hv or stock oil pump
dode
Dirt Freak

Total posts: 417
posted March 31, 2003 04:27 PM UIN: 13209501
Stock oil pan with 1.5 qt accumulator, running 6000 rpm in a 9:1 compression small block chevy, which oil pump should I run? I am leaning toward stock, but wanted some more opinions.

John

Alltel
Dirt Full Roller

Total posts: 39
posted March 31, 2003 04:33 PM
Everybody always says that you need the high volume pump, but I have run the same motor for 3 years with stock pump. 355 with around 11.5 to 1 at around 7200 rpms.

dirtbuster
Dirt Freak

Total posts: 353
posted March 31, 2003 05:05 PM
If you have close to stock clearances then you should be fine with the stock pump. .002-.0025 should work good. More than that i might lean toward the HV pump.

The Rascal
Dirt Roller

Total posts: 13
posted March 31, 2003 05:49 PM
Our general rule #1 is PRESSURE…especially on dirt…if it’s a “stop & go” deal we need pressure to float the crank…I’m not sure how it works in the others but in a Mopar unneeded volume is just dumped into the sump and power is wasted pumping it…on pavement or a big high RPM bowl if dirt…we need to replace oil that’s slung from the rod journals…this set of rules has served well for decades and…again Mopar only…the only time we’ll go to high volume on lower rpm or stop and go motors is with a long stroke…because of the larger circumference of the rod journal…or faster journal speed if you will…our rules for that deal are loosely set at higher than 3.580” (stock 360) and 3.750” (stock 440) for bigblocks…like anyone cares…LOL….Rascal

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"blessed mother of acceleration don't fail us now!" Elwood Blues

rico 08
Dirt Freak

Total posts: 372
posted March 31, 2003 08:58 PM
Stock volume,almost always with stock pan.

Racer14K
Dirt Freak

Total posts: 247
posted April 01, 2003 05:24 PM
I'm running a 406 with 8qt pan spinning at 7800 with the Z28 pump ( stock volume high pressure ). Have not had a problem, Melling number is M55A.

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