What's accetable oil pressure (at idle & 2500 @ rpm) for a '92 Chevy 454 truck engine? This is a hot rod question because the truck containing this engine would be used to pull a 8,500 lb. trailer whose contents include a rod with a Ford engine. Don't want to be left stranded in the middle of nowhere. The truck in question has about 100,000 miles on it with no engine work done in the past. Current oil pressure (when hot, registered on an Autometer guage) is about 22 lbs. at idle, and 35 lbs. at 2,000 - 2,400 rpm. Any help greatly appreciated.
4 Jaw Chuck
08-13-2002 09:41 PM
Thats fine, don't worry be happy! :D
08-14-2002 12:08 AM
My buddy has a 91 305 SBC and it drops too 7 psi at idle...and its been doing that for 4+ years...so with 20-30 you are without a doubt fine.
[ August 14, 2002: Message edited by: BuggyMan303 ]</p>
08-14-2002 12:10 AM
Not that 4 jaw chuck needs any back-up, (I've read alot of his posts the last few days, definatly knows his stuff!) but I read once that 10 psi per 1000 rpm would offer the maximum protection and that any more just causes extra power loss from pumping excessive oil that is not needed.
08-14-2002 07:33 AM
Wow!!! I might have a real problem if this is correct. My 350 reads 80 psi on the stock truck guage (84 Chevy). After it warms up it goes to about 65/70 and around 30/40 at idle sometimes a little lower depending on the engine temp. Could this be an indication of a problem or maybe just a bad guage.
08-14-2002 12:46 PM
My 455 runs at 60 psi when cold,(initial start of the day) drops to 20 when at idle and 30,30+ when normal driving.
08-14-2002 10:35 PM
I'm not saying that more than this is going to be a problem, I'm just saying that is all that is required for proper operation. In a street car that sees many miles of use and ware you have to start with a higher pressure because when things wear it will eventually get lower. If you start out on the edge when new, you would need freshining up after maybe 10,000 miles. On another note I have seen dyno tests that show that if you run your oil level at the bottom of the acceptable range versus at the most full of the acceptable range, you can see a 7-10 hp increase. How is that for a free tenth in a pinch!?