Joe Huffaker told me that he found 50 + + psi was the reason for GM V8
core plugs being expelled from the blocks at high RPM..
I made a "long neck" 7 psi cap for my racing TR3 by adding an extra spring
or two to the cap, and testing the blow off pressure with a gauge and a
garden hose. When I still ran the TR3 heater for extra cooling, it was OK
with 7 psi.. I did slow down the water pump on the race car at a later date.
TR Regards,
Hardy
In a message dated 3/17/2012 11:03:08 A.M. Pacific Daylight Time,
triumphs-request at autox.team.net writes:
From: "Randall" <TR3driver at ca.rr.com>
To: "'Cosmo Kramer'" <tr4a2712 at yahoo.com>
Cc: triumphs at autox.team.net
Subject: Re: [TR] Radiator Caps
> I've know places to pressure test the
> cooling system up
> to 15 PSI (over night).
Something that complicates this picture: The pressure is not constant
throughout the system when the engine is running. In order to circulate
the
water, the water pump has to create a pressure differential. How big the
pressure differential is depends on several factors, including engine rpm.
Some of the racers have reported finding over 30 psi at the heater fitting
on the rear of the head (with no heater attached, of course) during
sustained high rpm operation.
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