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HEADSUP113 05-07-2011 08:24 PM

Oil pressure
 
Sbc 434 new engine 20/50 brad penn oil , what should be the max oil pressure cold ? 80 psi seems high to me. Any thoughts

Matt Warner 05-07-2011 11:52 PM

Re: Oil pressure
 
My small block ford has 80 psi cold at idle around 1200 rpm, drops to around 65 to 70 psi warm. I am running a Melling high volume pump and 10/30 oil, what is your bearing clearance? in my experience 80 psi is not uncommon to see with a cold engine and a high volume pump in a small block with .002 bearing clearance. I have heard it said that you want to see 10 psi per 1000 rpm. Mine goes through the traps in the 7000 rpm range with about 85 psi.

Bill Baer 05-08-2011 08:03 AM

Re: Oil pressure
 
Headsup 113

If you build your motors with ~.002-.0025" bearing clearance like I do my big blocks and use 20-50 oil,80 psi cold is about normal.
I always make sure that I throughly warm the oil before I rev it. Although I have never done it it's probably possible to blow out the oil filter gasket or o-ring if you rev it cold.

67champ 05-11-2011 01:57 PM

Re: Oil pressure
 
That does not seems too high with 20/50 cold.....

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Bob Verwold 05-11-2011 09:19 PM

Re: Oil pressure
 
Quote:

Originally Posted by HEADSUP113 (Post 257227)
Sbc 434 new engine 20/50 brad penn oil , what should be the max oil pressure cold ? 80 psi seems high to me. Any thoughts

Same oil in a 421 sbc and mine has always been 75-80 psi until it warms up.


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