If you run the typically thicker oil we run in our Healeys--20W-50, say--and
start the engine on a cool morning, the
oil pressure you see at fast idle should be the setpoint (around 60psi) for the
relief valve, no?
It seems to me, at any pressure below the relief valve setpoint the spring
would make no difference, but the seal of the
valve against the bypass passage would, as it could be just another pressure
'leak.'
bs
On 9/29/2010 7:03 AM, Robert Duquette wrote:
> That's a lot of "what ifs". :)
> I have a bad memory, so correct me if I'm wrong. Here's the way I remember
> the issue:- he had more oil pressure before he rebuilt his engine- he replaced
> the oil pressure relief valve ( or just the spring? ) as part of the
> rebuild- His original question was regarding whether air in the line to
> the gauge could be affecting things.
> "What if" he just put the old spring back in so that he's comparing apples to
> apples?
> ( while perhaps comparing the 2 springs for length while they're both in his
> hand. I'm not sure how you would compare the strength of the springs. Someone
> knows. )
>
> I believe the response that he got to the "air in the line" question was that
> "pressure was pressure", but I really don't think that it would hurt to try
> that. We tend not to like air in our brake lines. So what do you have to
> lose besides time?
> I'm really an ignoramus on these issues, but I was just thinking ... I know,
> it doesn't become me! ;)
>
>
--
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Bob Spidell San Jose, CA bspidell@comcast.net
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