Oil pressure

HEADSUP113 · 05-07-2011, 08:24 PM

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

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

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

That does not seems too high with 20/50 cold.....

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Bob Verwold · 05-11-2011, 09:19 PM

Quote:

Originally Posted by HEADSUP113

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.

05-07-2011, 08:24 PM	#1
HEADSUP113 Junior Member Join Date: Dec 2010 Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	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

05-07-2011, 11:52 PM	#2
Matt Warner Junior Member Join Date: Feb 2011 Location: Sumas, WA. Posts: 13 Likes: 6 Liked 0 Times in 0 Posts	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.

05-08-2011, 08:03 AM	#3
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	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. __________________ Bill Baer 3391 SC, 339B SC, QR

05-11-2011, 01:57 PM	#4
67champ Junior Member Join Date: Feb 2002 Location: Ohio Posts: 48 Likes: 7 Liked 4 Times in 2 Posts	Re: Oil pressure That does not seems too high with 20/50 cold..... d t