[TR] TR2/3 rad cap pressure

Randall tr3driver at ca.rr.com
Thu Jul 8 11:04:39 MDT 2010


> My '2 came with 
> a 7lb. cap. 
> I thought they were supposed to run a lower pressure cap. Any 
> thoughts? 

The stock cap was 4 psi.  Running a slightly higher pressure cap does not
seem to be a problem, as long as you don't also have an original type
"aneroid" (bellows) thermostat.  Since the bellows works on air pressure vs
coolant pressure, running higher coolant pressure can upset it.  Or such is
the theory anyway, I've never actually tried it.

I'm running a 10 psi cap on my TR3, but it has a modern "wax pellet" type
thermostat and no heater.

Randall


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