High Volume Oil Pump?
Melting Slicks
Joined: Dec 2005
Posts: 2,441
Likes: 0
Originally Posted by sweethence
For the same reason people upgrade waterpumps yeah the old one worked, but there is always room for improvement
Last edited by shafrs3; Mar 1, 2006 at 10:15 AM.
Racer
Joined: Jul 2004
Posts: 254
Likes: 1
Originally Posted by Eric79-L48
So based on what I am reading, for my 100% stock L48 with 72k miles I am going with the Melling M55 Standard Oil Pump. Aside from the "religious" issues, as it were, any reason why this is a bad idea??
Note we have NHRA Super Stockers running SBC to 9000 rpm with 3 qts of oil and a std volume pump.
Chris
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I did make a little white lie though, I run the "Z28" pump with a little stiffer spring for a bit more pressure 
Still not regarded as HV or HP
Still not regarded as HV or HP
Instructor
Joined: Dec 1999
Posts: 229
Likes: 1
From: Buenos Aires, Argentina
Originally Posted by 80TexasC3
I did a high volume melling with my 383 conversion... consistently puts out 60 to 80 lbs of pressure...vs 20 to 45ish with the stock... must be good.
Le Mans Master
Joined: Jan 2006
Posts: 8,319
Likes: 7
From: Wilmington DE, Drive it like you stole it, 68 327 4 speed coupe
Originally Posted by shafrs3
When the glass is full more water is not an improvement.
the glass is hardly full with a plain jane GM water pump , come on now
Burning Brakes
Joined: Sep 2005
Posts: 993
Likes: 3
From: Iowa
That’s the beauty of a dry sump oil pump. You can set the oil pressure and it will never vary more than a few pounds throughout the entire RPM range! It has its place right on the side of my aluminum race engine but for your street car with a stock engine I would run the standard pump. Road Race guys love high volume in the outlaw classes with the idea that more oil = more cooling from it; but that is debatable. I think that most of the hp/hv arguments stem from the "hey if it works on this race engine it has to work even better on my street engine right?" WRONG! Just my thoughts and slight rant.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I am building a 383 For my car. Comp Cams Retro 288 Hydraulic roller cam. Now I am worrying about the High volumn vs. High pressure debate. Blowing a lifter is BAD NEWS! So is pumping all your oil into the valve covers. Good post. I will keep my 
open!
open!
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Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I run oil restrictors in the rear galleys and they limit the oil to upper valve train and keep more down towards the center of the motor, cam, lifters etc. seems to worlk pretty good for me, my solid roller lifters looked brand new after 10,000 miles
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
Originally Posted by sweethence
the glass is hardly full with a plain jane GM water pump , come on now
The stock GM water pump is not the weak point of the cooling system despite what jeg's and summit would like you to believe.
Race Director
Joined: Feb 1999
Posts: 16,978
Likes: 7
From: In Dreams There Is Truth Ohio
I'm going to give my opinion on this:
If you take the oil pump appart, you well see wear marks between the teeth. It may not seem like much, but the wear marks are there, hence purchasing a new pump, standard pump, makes a lot of sense.
Now, regarding the HV/HP pumps. If you're running a roller cam, especially a solid roller, it is imperative the lifters get lubrication, lots of lubrication and a HV pump will ensure the lifters will get lubricated.
If I were the poster of this thread, I would not hesitate to get a new pump, a standard pump. Using the old pump, the oil pressure will be there at cruising speeds, but at idle, the pressure will drop significantly due to the wear on the gears.
Something else...a new pump's gears should be packed with vaseline
If you take the oil pump appart, you well see wear marks between the teeth. It may not seem like much, but the wear marks are there, hence purchasing a new pump, standard pump, makes a lot of sense.
Now, regarding the HV/HP pumps. If you're running a roller cam, especially a solid roller, it is imperative the lifters get lubrication, lots of lubrication and a HV pump will ensure the lifters will get lubricated.
If I were the poster of this thread, I would not hesitate to get a new pump, a standard pump. Using the old pump, the oil pressure will be there at cruising speeds, but at idle, the pressure will drop significantly due to the wear on the gears.
Something else...a new pump's gears should be packed with vaseline
Drifting
Joined: Oct 2005
Posts: 1,257
Likes: 4
From: North Carolina
Originally Posted by Cstraub69
I would put a stock pump back on it but not a HV. HV were intended for engines that had loose bearing clearances or run at very high rpms for extended period of time. I don't see either of these being your case. Along with that an HV pump takes more HP from the engine over stock to turn.
Chris Straub
Stef's Performance Products
Chris Straub
Stef's Performance Products
Dan
Melting Slicks
Joined: Oct 2004
Posts: 2,662
Likes: 8
From: Knoxville Tennessee
I have always replaced with high volume, not high pressure, and have never had a problem. But I would at least replace with an OEM pump while I had the opportunity. Just my 2 cents.
Bernie
Bernie