Bob,
I would agree. If the radiator fluid, whatever it is, boils at certain
temperature under certain conditions, say sea level and one atmosphere
of pressure, I recall from college or high school chemistry that under
greater pressure, the boiling point rises. So if you have a 4lb cap, it
will open as a relief valve at a lower temperature than the 13lb cap. I
wouldn't think it would affect how hot or cool the car runs but it won't
be able to resist an overheating situation as well. You'll lose more
coolant and ultimately that might cause you to run hot.
Bob Clark
'69 TR6
The more pressure in the cooling system, the higher the boiling point
for
the coolant is.... so the 13 pound cap is your better bet for the 6
since
your coolant would not boil as easily under that pressure.
Maybe the PO had some issues with the radiator or hoses leaking with the
higher pound cap, so he/she went to the 4 pound? Keep an eye on your
system once you switch over!
- Aldwyn
At 08:37 PM 8/13/2007, Bob Danielson wrote:
>While poking through the 6-Pack forums, I saw a post on the impact of
>radiator caps and thermostats on cooling the car. I understand the
>thermostat impact but what does the radiator cap do cooling wise? It
>somehow raises or lowers the boiling point? I checked and my car has a
>4 lb cap while Moss & TRF state that a 13 lb cap is needed for my model
>year. Does the 4 lb cap make the car run hotter or cooler?
>
>Thanks
>Bob
>
>Bob Danielson
>1975 TR6 CF38503U
>Running w/ Throttle Body Injection http://tr6.danielsonfamily.org
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