You lost me Bob?
Where did you install a 1/4 inch bolt?
Mark
----- Original Message -----
From: "Bob Spidell" <bspidell at comcast.net>
To: "healeylist" <healeys at autox.team.net>
Sent: Saturday, April 30, 2011 10:16 PM
Subject: [Healeys] Pressure relief valve
> Background: my BJ8 has run low oil pressure at idle for as long as I've
> had it. At startup I get 60psi, but after running on hot days I would
> register, for all intents and purposes, zero psi at idle. In spite of
> this, the engine has run and performed well for me for over 100K miles. I
> use 20W-50 dino oil.
>
> There has been a lot of discussion on the BCF about replacement relief
> valve springs being shorter than spec. It has been suggested that putting
> washers or other shims or a 1/4-inch bolt behind the spring could increase
> running pressure. I actually didn't believe it because AFAIK the valve is
> there to keep pressure from getting too high, and presumably would be
> fully closed at normal running pressure. But, I was curious ...
>
> So today I pulled the relief valve and measured the spring at 2 & 11/32";
> quite a bit less than 'spec.' So I installed the 1/4-inch bolt and fired
> her up; 70psi on cold start/fast idle--not too surprising. What's
> surprising is even after the engine has warmed-up--when I would normally
> see 10-20psi, before a long run in hot weather--I am getting 40psi. And
> the max pressure is still at 70psi; so the effect is max pressure is up
> 10psi, but the hot idle pressure could be up 10-20psi!
>
> My questions to the forum are: is 70psi too high a max oil pressure? Any
> explanations for this phenomenon? Should I split the difference with some
> shims? Go back to the spring-only setup so I can sleep?
>
> Bob
>
> --
> *******************************************************************
> Bob Spidell San Jose, CA bspidell at comcast.net
>
> *******************************************************************
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