Instead of the bypass, would drilling a couple of 1/8th holes in the
thermostat body do the same thing? It would allow some flow out of
the head before the thermostat opens up. What does the group think?
Joe(B)
----- Original Message -----
From: Jack Brooks <brooks@belcotech.com>
To: <fot@autox.team.net>
Sent: Thursday, May 03, 2001 1:22 PM
Subject: RE: cooling?
> Jack,
>
> For the street cars, the conventional wisdom is to block off the
bypass, but
> leave a small hole. With a T-stat and a blocked bypass there will be
> essentially no water flow when the engine is off.
>
> In my engine, I use a modern thermostat, a Robertshaw (#330-160
HiFlow) and I
> have a 1/4 hole in the bypass block to allow some water to circulate
back to
> the head and block. BTW - I use the Robertshaw HiFlow because it
has about
> twice the open area of a normal T-stat, which according to the
recent threads
> about the desirable water pressure in a block may or may not be a
good thing.
>
> Conversely, since this is a race engine not a street engine, I
believe you
> could accomplish the same result by leaving the bypass blocked but
add a few
> small holes in the T-stat itself, allowing some small amount of
water to flow
> through the radiator at all times. This would protect the block and
head from
> localized overheating, etc., during warm up, but still control the
flow of
> water during the race, to reduce the overcooling. (Overcooling - Is
this a
> Triumph?)
>
> The bottom line is to make sure some water can flow through the
engine at all
> times. You don't want localized overheating, then rapid cooing when
the T-stat
> finally opens up.
>
> Jack Brooks
>
> >-----Original Message-----
> >From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net]On
> >Behalf Of Jack W. Drews
> >Sent: Thursday, May 03, 2001 7:36 AM
> >To: fot@autox.team.net
> >Subject: cooling?
> >
> >
> >Okay, here's a new twist and a question with it.
> >
> >My TR4 runs too cool, Temperature-wise, that is.
> >
> >I fitted a large aluminum stock car style radiator to it and solved
all
> >cooling problems once and for all. It's great.
> >
> >However, now the engine doesn't get warm enough! On a 90 deg July
day it
> >will run 160, and on a 50 - 60 deg day it will run 120 or so.
> >
> >I don't have a thermostat in it, and I blocked off the bypass hose
when
> >I was trying to cool it down while running the stock radiator.
> >
> >Here's the question: If I put a thermostat in it, should I make
the
> >bypass hose operable again?
> >
> >--
> >
> >uncle jack and New Blue
>
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