[Amc-list] Oil Weights

[Nick ALFANO <71amx@xxxxxxxxxxxxx>]

Cliff,
 
It really depends on the clearance you have in your engine.  If you built it a little loose for racing, then stick with the 50 weight.  If the engine is tight, go ahead and switch to 40.  It shouldn't hurt anything.  If you don't start this car in cold weather, you can run straight grade.  40lbs of oil pressure is not what I would call too high but  more in the realm of just right.  If it was 65-70 hot and over 80 cold, then I would say yes, that is too high and more than you need.  My assumption is that you are saying it is 40lbs at an idle after it has warmed up to operating temp.  Again, I would judge the viscosity of the oil I use based on the clearances in the engine first.
 
If it is a flat tappet engine, run something high in zinc and phosphorus.  Rotella CJ4 diesel oil, certain synthetic racing oils or Joe Gibbs Hot Rod oil (this is the highest concentration I have found).
 
Nick
 
Alfano Performance
4849-76 st.
Kenosha, WI. 53142
262-308-1302
262-942-8271 after 6pm central and weekends 
 
 
Message: 11
Date: Sun, 13 Apr 2008 08:46:26 -0400
From: "Clifton  Danley" <am401@xxxxxxxxxxx>
Subject: Re: [Amc-list] Oil Weights
To: <mail@xxxxxxxxxxxx>
Message-ID: <000601c89d64$6351ba10$0201a8c0@cliff>
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    reply-type=original

Frank, Nick, and others:

I have a 401 Spirit drag car which does see some street time, and I run 
15W-50 Mobil 1. Recently I gave a ride to a friend who happens to be an 
experienced AMC V-8 builder, someone whose judgement I thoroughly trust. He 
saw my oil pressure and said to change to 10W-40 (he thought it was too 
high). It never goes below 40 PSI (mechanical gauge). I have the Milodon 
sump with external lines to the oil pump. I plan to switch to diesel 15W-40, 
both reducing the viscosity and getting the additives only found in diesel 
oil now. Comments?

Cliff Danley
Jacksonville, Florida 
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