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Author
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Topic: How much oil pressure do you guys like to have?
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Mike_R
Gearhead Posts: 178
From: Indianapolis, IN 46237
Registered: Feb 2001
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posted 05-15-2003 10:50 AM
   
I'm curious about how much oil pressure is enough and how much is overkill and hurts horsepower?My current engine runs at about 20 pounds at idle but goes up as the engine revs up. Just wondering if I should try to have higher oil pressure with my new engine by restricting the top end or if it would be just wasting hp. Thanks
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kid vishus
Gearhead Posts: 6395
From: middle of NC
Registered: Oct 2000
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posted 05-15-2003 11:06 AM
I think how much oil pressure is something that is also determined by what motor it is, and what clearances are. My cleveland for example, runs fairly loose clearances, and has around 100 lbs at idle when cold. Once it gets warmed up,it carries around 40-45 at idle and around 70 lbs at WOT. And that's using a 5W-30 synthetic oil.
I don't think most windsor (289-351) based combos run that much pressure. But, since I've never ran a windsor that wasn't basically stock, I don't really know.
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65_302
Gearhead Posts: 262
From: Bixby, OK
Registered: Jul 2001
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posted 05-15-2003 01:00 PM
My son's 302 crate engine runs 25 at idle and 55 at WOT. Has been that way since it was new and if has ~8K on it now.
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Fastymz
Moderator Posts: 20638
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 05-15-2003 03:25 PM
quote:
Originally posted by 65_302:
My son's 302 crate engine runs 25 at idle and 55 at WOT. Has been that way since it was new and if has ~8K on it now.
Mines the same way 
As long as it has pressure I'm happy.
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SCOOP
oddly obsessed with big scoops on little Mustangs
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
[This message has been edited by Fastymz (edited 05-15-2003).]
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two89w
Gearhead Posts: 315
From: sydney australia
Registered: Sep 2002
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posted 05-15-2003 05:00 PM
60 at hot idle, 100 at cold idle,80cruise
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N266fords
Gearhead Posts: 1652
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 05-15-2003 07:16 PM
You should have 10 psi pressure rise for every 1000 rpm increase over idle.. Bruce
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 05-15-2003 11:50 PM
I put a blueprinted stock pump in my 331 because of all the horror stories about dist. gears wearing out and pins shearing. My hot engine oil pressure stays at 40 psi idle, 55 cruising, and 65 max. I checked my dist. and cam gear yesterday and the wear pattern looks good even using the stock gear with the street roller cam. I did my first 3000 mile oil change and found NO particles in the oil filter or even on the magnet in the pan!.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
So far: 12.11 @ 114 mph (7.68 @ 93 mph)
DanH [This message has been edited by bluestreek (edited 05-16-2003).]
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N266fords
Gearhead Posts: 1652
From: Sierra Vista ,Az USA
Registered: Apr 2003
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posted 05-16-2003 01:24 AM
Bluestreak are you kidding me you are running a cast gear on your rollerits not the dist gear thats wearing its your cam gear Use a steal dist gear made buy crane cams
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kid vishus
Gearhead Posts: 6395
From: middle of NC
Registered: Oct 2000
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posted 05-16-2003 07:51 AM
A lot of, if not most, street rollers are designed to be used with a cast distributor gear.As for the 10 psi for every 1000 rpm, thats a really old "standard" started by those outdated techs at Crower. You know, the same techs that say not to use synthetic oil  . That standard is also outdated and is nothing more than an old wives tale now. I have seen a lot of roundy round motors with wet sump systems live at 8000+ rpm with only 60 psi oil pressure, and do it for an entire season.
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