[TR] 4 or 7 PSI radiator cap

[Bud Rolofson]

I was wondering the same thing about the 7 psi versus 13 psi radiator  
caps for a TR6.  The 7 psi appears (Moss catalog) to be for early cars  
up to 71 and the 13 psi for later cars but I've always run the 13 psi  
on my 71 TR6 and now I don't remember why...probably a result of  
advice from the list.

Any ideas on what changed, why the difference might be in running  
temps or other considerations?

Thanks
Bud Rolofson

71TR6 CC57365 (Good 6)
66TR4A CTC57806 (The Wreck-Almost parts)
66TR4A CTC57529 (The Project)
71F-250 Camper Special (Triumph Support Vehicle)
Z-50A Hardly Davidson 1977 Honda Mini-Trail Bike (Triumph Pit Bike)
levilevi at comcast.net




On Sep 19, 2010, at 6:51 AM, amcewen2 at cogeco.ca wrote:

> Any fundimental difference between the cooling system on a 3A vs. 3B  
> that would explain the different recommended cap?
>
> My 4-5 year old 4PSI cap fell apart in my hands (can't remember if  
> it was from Moss or TRF), and since it lifts and
> causes water loss under most conditions I figured I'd subsitute the  
> 7PSI one.  Waterpump, rad and hoses are new the only
> possible weak point might be the heater core.
>
> PS reproduction seat bracket rails falling apart before my eyes as  
> well.
>
> Thanks,
>
> Art
>
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