Trevor,
The business end (the Waxstat or whatever) gets the direct flow of hot =
water from the bypass. There is a temperature drop by the time it gets =
to the new thermostat position because of loss to atmosphere (due to the =
fan). Also in the new position, it is getting heat only from the water, =
not from conduction through the engine metal. My experience is that =
there is about 5-10 degrees C difference, so if your thermostat is 82 =
degrees C, the exit temperature from the head may be at 92 to open the =
thermostat. That's no problem, is it?
Remember that the whole point of this is not because of a problem, but =
to minimise energy loss from petrol already burnt and to use this energy =
to even out the engine temperature and make it more efficient. It also =
cures overheating since the radiator is not normally used. Seems =
logical to me, but I must admit that when I first heard about this it =
was a couple of days before I could really see the wisdom of it.
One problem I have had is that it takes too long for the engine to get =
to temperature and I've now put an 88 degree C thermostat back in the =
top housing for warm up and have an 82 degree C in the bottom. Seems to =
work.
I think you need this top thermostat anyway because without it, the =
faster you drive the cooler it gets.
----------
From: Trevor Boicey[SMTP:tboicey@brit.ca]
Sent: Thursday, 31 July 1997 16:00
To: Bob Hutton
Cc: 'Shop Talk'
Subject: Re: Automotive cooling
Bob Hutton wrote:
> It involves moving the thermostat from the hot water outlet
> at the top of the engine to the cold outlet at the bottom
> of the radiator.
This is my first exposure to this idea. However, I have
one warning sign that pops up.
The business end faces the engine, but I am not so
convinced that the thermostat is getting the hottest
water the engine has to offer.
Which would mean that the thermostat might not allow
flow until the water IT is in gets to 180 degrees or
whatever the rating of the unit. This might mean the
water elsewhere in the engine could be Darn Hot.
You might need to fiddle with thermostat ratings. I
don't have a problem with the current location, so I
would probably not bother to do that much fiddling
for a non-problem.
--=20
Trevor Boicey
Ottawa, Canada
tboicey@brit.ca
http://www.brit.ca/~tboicey/
|