using high volume oil pump

[chevyart]

what are pros and cons of using a high volume oil pump i SBC race engine. i have always heard drag racers they dont like them because it may suck the pan dry under certain conditions. would really like some comments on this topic as i am getting ready for oil pump install in a new engine. any comments on high pressure oil pumps? chevy art

[oldandtired]

You mentioned high volumn and high pressure. Different animals...

I run a standard volumn BBC pump on the small block (special length oil pump drive required). Gives plenty of volumn and resonable pressure.
JMO. Dave

[curtisreed]

I have never seen the need to run a high volume pump on a SBC in a naturally aspirated engine. Unless you are running huge clearances I believe the standard volume pump is plenty. Running a higher volume pump would just bypass more oil and use up more horsepower to run. Pressure is completely different. I do change the spring to have more pressure than what a stock pump has. Usually around 65-70lbs hot pressure at speed. Just my unqualified opinion.

Curtis

[zipper06]

Man that's a good question and i'll bet the answers will come in all kinds of different opinions. i personally run high volume pumps but i also run .0025/.003 clearance rods and mains. I use the stabndard spring (42 lbs) with 20/50 oil. It will maintain 40/50 lbs at rpm, but idles around 20/25 lbs. hot. I haven't run one yet but i like the B/BLK pump with the 3/4" pickup. The problem with high pressure is that it robs a lot of HP, causes cam distortion, wears distributor gears, and causes irratic distributor timing. If i could i'd have 25 lbs. pressure crossing the finish line or go dry sump. I do run a front distributor drive on the blower motor.

Like i said varied opinions for sure.

Zip.

[cepx111]

HV77 here, stock spring.

[curtisreed]

Zip, you are right it seems there are always more ways than one to skin a cat. Many people develope there combination over the years and no particular way is always best.

Curtis

[cncmotorsports]

Use Melling 10550

Reeving over 7500 use 10550c

Nasty engine use 10990c over 8000 rpm, change spring to low pressure spring.

[kwkracing]

Whats the difference in the 10555 pump?

[zipper06]

Whats the difference in the 10555 pump?

Here you Go,

Zip.

http://www.mellingselectperformance.com/Products/CastIronOilPumps.aspx

[Tod74]

I use a high volume but I did it because my clearances are .003 on the rods and .003- .0035 on the mains.

[TS1955]

Just be sure you have a good oil supply when running a high volume pump. I've seen guys put a high volume pump on a "stock" capacity pan and suck it dry at high RPMs. Just my 2 cents.

TS1955