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02-07-2009, 02:17 PM
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CC Member
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Join Date: Oct 2006
Location: Virginia Beach,
va
Cobra Make, Engine: BDR #250
Posts: 234
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Not Ranked
Acceptable Oil pressure at Idle
Is 37-40 psi acceptable at idle when the engine is at operating temp? I have a new KC 363 Dart block engine. I'm just getting all the feed back I can...Thanks Mike
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02-07-2009, 02:32 PM
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CC Member
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Join Date: Dec 2004
Location: Kansas City,
KS
Cobra Make, Engine: jbl
Posts: 2,291
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Not Ranked
mine runs 25 whether i used 5w30, 10w30, or 20w50.
i was told to let the idle fall where it may, and have read where it takes very little pressure at idle, less than 10 lbs., to keep things working. you just want your working pressure to be where it should be from my understanding.
higher flow could be preferred over pressure in some instances.
but jmo
hth
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02-07-2009, 03:13 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,001
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Not Ranked
Quote:
Originally Posted by Mac VABCH
Is 37-40 psi acceptable at idle when the engine is at operating temp?
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That's plenty. FWIW, the 1970 Ford shop manual (Boss/429/428cj/scj/429cj/scj) states that the correct psi is 25-60 lbs @2000rpm HOT. FURTHER, it lists the minimum psi as 6lbs at 400 rpm! BTW, my FE runs high-teens at idle when blistering hot. |
02-07-2009, 04:37 PM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
Any oil pressure above 10 psi at idle is fine in any motor, as long as the pressure value is consistant over time.
My 351 has 45 PSI at idle and 55 to 60 PSI at speed. Have 18K miles and no problems internal so far ... knock on wood.
__________________
Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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02-07-2009, 05:53 PM
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Banned
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Join Date: Oct 2003
Location: Yorba Linda,
CA
Cobra Make, Engine: SPF w/392CI stroker
Posts: 3,293
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Not Ranked
Sounds good (my hot pressure @ 800-850 rpm idle is 38-39), and as a general rule of thumb, you want to pull 10psi for every 1,000 rpm.
-Dean
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02-07-2009, 05:56 PM
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CC Member
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Join Date: Oct 2006
Location: Virginia Beach,
va
Cobra Make, Engine: BDR #250
Posts: 234
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Not Ranked
Thanks for the response I was pretty sure that it was ok...Thanks again Mac
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02-09-2009, 06:06 PM
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CC Member
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Join Date: Jul 2005
Location: San Tan Valley,
AZ
Cobra Make, Engine:
Posts: 194
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Not Ranked
We used to use 10 pounds per 1,000 RPM.
Not sure why.....but It seems to work.
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02-09-2009, 06:18 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
wtm442....You been listening to Smokey and doin' the math?
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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02-10-2009, 01:56 AM
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CC Member
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Join Date: May 2008
Location: San Jose CA,
CA
Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
Posts: 2,523
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Not Ranked
Keep in mind if you are using an oil cooler setup you will drop -- 5-10PSI due to the added volume of the circuit.
--Steve
__________________
Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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