[Healeys] Pressure relief valve

[Bob Spidell]

I expected the higher cold pressure, too.  What I didn't expect was higher hot at idle, because the valve should be 
fully closed (shimmed spring or not).

Bob


On 5/1/2011 6:16 PM, Robert Blair wrote:
> Result is what I would expect - 70 cold should not a problem, but dont run it at 4krpm till it warms a bit.
>
> A coil spring exerts a pressure proportional to the compression.  So by compressing the spring more when seated, you require a higher pressure to move it of the seat.  You are simply moving its operationg point up the pressure curve.
>
> Ideal 3k rpm hot would be 55ish, 1k idle hot would be 35ish.
>
> Robert N. Blair  Yellow 65BJ8  RNBmail at yahoo.com
>
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Bob Spidell           San Jose, CA            bspidell at comcast.net

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