Scott: What Chip said. I just got my TC back on the road and when
doing the thermostat (pellet type) I did not install a restriction in
the bypass. I thought I would leave it open to see how the
temperature would react here in central Florida in the summer. I
also wasn't sure of the condition of my radiator. In the last few
days of driving I find that the engine does not get above 150 degrees
with the bypass open. BTW the thermostate is a 180. So I will now
congratulate myself on a good radiator and add a blocking plate to my
"to do list". You might want to do the same, that is put it together
without the plate and see how your temperature is and then put the
plate in later as needed. It is easy enough to do afterwards.
Regards, Larry
----- Original Message -----
From: Chip Old <fold@bcpl.net>
To: <mg-t@autox.team.net>
Sent: Wednesday, September 27, 2000 11:38 PM
Subject: Re: Blocking the Bypass
> On Wed, 27 Sep 2000, Scott Allen wrote to mg-t@autox.team.net:
>
> > I'm finishing up on my TD's cooling system, and have the
thermostat
> > off the car. As such this would be the time to consider blocking
the
> > bypass. I remember there being some discussion about this in the
> > past, and have searched the archives which indicates that doing
this
> > is a bit controversial. I need to know from the listers why it's
> > desirable or undesireable to do this, and the best way to do it if
I
> > decide to go ahead with it.
>
> You didn't say what type of thermostast it is, and that has a
bearing on
> the answer.
>
> If it's the original bellows-activated type with a bypass sleeve
valve,
> and if it still works, put it back and don't worry about the bypass.
When
> the thermostat is closed the bypass will be open, routing coolant
through
> the engine but not through the radiator. When the thermostat is
open the
> bypass will be closed, routing all coolant through the engine.
>
> If it's a replacement housing or an original housing modified to use
a
> modern pellet-operated thermostat, then either leave the bypass
unblocked,
> or (better) reduce the bypass passage to a 1/4 inch diameter hole.
There
> are a number of ways to do that, but the simplest is a plate between
the
> housing and the bypass elbow with a 1/4 inch hole drilled in it.
>
> Don't block the bypass completely. If you do, when the thermostat
is
> closed there can be no water circulation through the engine. That
can
> cause localized hot spots. That might not cause any immediate
problems,
> but over the long haul it will contribute to short exhaust valve
seat life
> and faster cylinder bore wear.
>
> Others here will disagree, so now I'll step well back and watch the
fun...
>
> --
> Chip Old 1948 M.G. TC TC6710 XPAG7430 NEMGTR #2271
> Cub Hill, Maryland 1962 Triumph TR4 CT3154LO CT3479E
> fold@bcpl.net
>
>
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