What is the reason for changing the pressure on the radiator cap.
This is something that we have been doing for many years, it is
simple you raise the boiling point of the water in the cooling
system. How many of you are always having to top off the radiator
because when you stop the car on a hot day and the temp gauge goes up
and up. Then it spits out a little water out the overflow. What is
happening is the pressure in the system is exceeding the cap pressure
and then it lets the excess pressure and thus loosing water. This may
not be a problem in cooler climates but in most climates and in most
driving conditions when you start getting that temp up it will loose
water when you shut the engine down.
By raising the pressure this stops this loss of water every time you
shut the engine down on a hot day.
Yes the bellows type thermostat is original but original is not
always best, There are many things on these cars that new upgraded
things are available, and we use them all the time.
Who is driving around on Bias ply tires versus Steel belted radials
How many are using the tar top batteries that crack and leak acid in
the trunk
Who is running electronic ignition
How many have changed to chrome 72 or 60 spoke wheels
DIsc brakes on early cars
Convert to negative ground
Rear crankshaft seals to stop the original oil leaks
etc. etc. etc
David Nock
British Car Specialists
Stockton Ca 95205
209-948-8767
www.britishcarspecialists.com
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On May 25, 2006, at 7:51 AM, Editorgary@aol.com wrote:
> Roger Moment and I reviewed the one-page flyer that Mike Grant from
> Moss sent
> us. It shows and describes in detail the two sliding-sleeve
> thermostats Moss
> sells. In Roger's opinion, the Moss part 434-165 bellows-type
> thermostat is
> the correct one to use on all Austin-Healeys, but it should be
> noted that a
> seven-pound cap, as original, should be used in conjunction with
> this thermostat.
> Moss also sells a "wax capsule" thermostat that does have a sliding
> sleeve,
> but it is designed to work with higher-pressure systems using e.g.
> a 12-pound
> cap, and in Roger's view, running a higher pressure in the cooling
> system might
> not be a good thing in Healeys and could lead to other problems.
> The worse that's going to happen with an original thermostat and
> seven-pound
> cap is that if the system overheats seriously, the pressure will be
> exceeded
> and the excess coolant will spew out the overflow hose. If that's
> of concern,
> one might consider installing an overflow/return tank that allows
> the coolant
> to return as the system cools down.
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