Oil pressure question
Thread Starter
Advanced
Joined: Sep 2012
Posts: 86
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From: Rochester NY
Oil pressure question
Is there an ideal oil pressure? I have a 350, bored .060. It has an oil pressure of 80. Is that normal? Seems high, since the gauge only goes up to 80. What's normal, safe, high, etc...?
Thanks.
Thanks.
Instructor
Joined: Nov 2012
Posts: 219
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From: Irma Northern WI
As a rule of thumb, that is high but, many rebuilders stretch or shim the oil pump bypass spring to raise pressure. Check it with a good gauge and be sure that it is actually that high. The viscocity and temperature of the oil also has an impact on pressure.
Thread Starter
Advanced
Joined: Sep 2012
Posts: 86
Likes: 2
From: Rochester NY
Is that pressure measured at idle? Are you using the factory gauge and believe that to be accurate?
As a rule of thumb, that is high but, many rebuilders stretch or shim the oil pump bypass spring to raise pressure. Check it with a good gauge and be sure that it is actually that high. The viscocity and temperature of the oil also has an impact on pressure.
As a rule of thumb, that is high but, many rebuilders stretch or shim the oil pump bypass spring to raise pressure. Check it with a good gauge and be sure that it is actually that high. The viscocity and temperature of the oil also has an impact on pressure.
Burning Brakes
Joined: Oct 2001
Posts: 1,241
Likes: 4
From: Okinawa Okinawa
Seems a little high. I would talk to the engine builder about what they think it should be. You want 10psi per 1000 rpm that your engine is running.
What oil are you using? 10w30, 10w40 ect, not what brand.
Could be the sender or gauge. What was it reading on your old engine?
I have a ZZ4. It runs about 50psi when cold, 40 psi at idle when up to temp w/ 10w30.
What oil are you using? 10w30, 10w40 ect, not what brand.
Could be the sender or gauge. What was it reading on your old engine?
I have a ZZ4. It runs about 50psi when cold, 40 psi at idle when up to temp w/ 10w30.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,114
From: Crossville TN
Factory stock engines (most of them) run at about 40-45 at highway speed and can run anywhere from 10-20 at idle. If your engine is putting out 80 psi, it has had a pressure regulator spring change (or a complete pump change).
