Re: Such a thing as TOO MUCH oil pressure
[Re: astrobuf]
#1488828
08/23/13 12:41 AM
08/23/13 12:41 AM
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Joined: Oct 2003
Posts: 11,702 W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,702
W. Kentucky
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Quote:
Quote:
Years ago I had a 440 with a high pressure pump in it, in cold weather it would peg a 100# gauge at start up. At temperature it ran almost 75# at cruise rpms. The only oil I ever ran in it was Havoline 10-40. After beating on it for five years I rebuilt it and installed a standard pump.
High pressure and high volume pumps are two entirely different things. I high pressure pump simply has a higher rated relief spring. A high volume pump has a higher displacement volume.
Astrobuf
You are correct.
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Re: Such a thing as TOO MUCH oil pressure
[Re: TooMany62s]
#1488831
08/23/13 12:35 PM
08/23/13 12:35 PM
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Joined: Sep 2006
Posts: 3,017 Sac, CA
mopowers
master
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master
Joined: Sep 2006
Posts: 3,017
Sac, CA
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Quote:
Quote:
Quote:
Quote:
Years ago I had a 440 with a high pressure pump in it, in cold weather it would peg a 100# gauge at start up. At temperature it ran almost 75# at cruise rpms. The only oil I ever ran in it was Havoline 10-40. After beating on it for five years I rebuilt it and installed a standard pump.
High pressure and high volume pumps are two entirely different things. I high pressure pump simply has a higher rated relief spring. A high volume pump has a higher displacement volume.
Astrobuf
You are correct.
Not correct. A high volume pump has more displacement and a higher bypass pressure. http://www.melling.com/Aftermarket/Tech-Tip-Videos
Not all high volume pumps are high pressure
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Re: Such a thing as TOO MUCH oil pressure
[Re: mopowers]
#1488832
08/23/13 01:12 PM
08/23/13 01:12 PM
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Joined: Jan 2003
Posts: 26,538 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,538
Rio Linda, CA
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I've never seen a HV pump that didn't have the black high pressure spring.
The INTERNET, the MISinformation superhighway
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Re: Such a thing as TOO MUCH oil pressure
[Re: 70VERT]
#1488837
08/24/13 12:19 AM
08/24/13 12:19 AM
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Joined: Feb 2005
Posts: 4,333 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,333
Prospect, PA
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... and around 70# at 2000 while hot.
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I rarely take it over 5K but at those revs and hot it pushes about 55-60#.
These two statements seem to contradict each other. Are you saying hot at 2000 rpm oil pressure is 70 psi, and drops to 55 psi at 5000 rpm?
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Re: Such a thing as TOO MUCH oil pressure
[Re: 70VERT]
#1488838
08/24/13 01:25 AM
08/24/13 01:25 AM
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Joined: Jun 2012
Posts: 1,902 MYRTLE BEACH SOUTH CAROLINA
ek3
top fuel
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top fuel
Joined: Jun 2012
Posts: 1,902
MYRTLE BEACH SOUTH CAROLINA
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Quote:
My 440 makes about 90# of oil press at 1000 RPM cold and around 70# at 2000 while hot. Is this abnormal or anything I should try and rectify?
smokey yunick put it best . you need 10 lbs of oil pressure per 1,000 rpm. if your engine will see 9,000 rpms , then it will benefit from 90 lbs of oil pressure . with the tight clearance in todays engines, coupled with the advancement of synthetic oils, 15-20 lbs hot @ idol with 65 lbs maximum is the standard for most street strip engines. many older engines with less quality machine tolerances will need the heavy weight oils to keep pressures up when hot. remember this... an engine which is on oil by-pass is not filtering the oil...get your pressure corrected and you will solve all issues.
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