[TR] Radiator Caps

[Catpusher at aol.com]

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
Message-ID:  <007d01cd045c$bce9e580$0301a8c0 at randall>
Content-Type: text/plain;  charset="us-ascii"

> 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.