Phil et al.
The blanking thermostats were original on the early B-Series as fitted
to the Magnette and MGB. We don't recommend them for later cars that
have a high pressure cap fitted. The coolant pressure can get high
enough to jam the soft copper bellows in the thermostat.
The bypass passage in the B-series head is not large enough to be a
problem on street driven cars. The Blanking sleeve is only really
useful if the car is racing and coolant flow through the radiator is
critical.
The bellows blanking thermostat is really useful on cars that have a
large bypass passage such as the TR3-4A, Austin-Healey and Jaguar 3.8L.
Kelvin.
-----Original Message-----
From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net] On
Behalf Of Phil Bates
Sent: Thursday, June 29, 2006 1:52 PM
To: Max Heim
Cc: MG List
Subject: Re: front license plate
Another thing people have done is get a bypass blanking thermostat (I've
done that). They are expensive at about $35 (from moss) when a run of
the
mill thermostat is less then $5. What it does for you is this - when
the
thermostat opens, a sleeve closes off the bypass that keeps coolant flow
during warm-up. That way all flow is diverted to the radiator for
cooling, none through the bypass. I think they're only available as
1600F
units. This does help if your cooling is marginal - if you have real
cooling problems, you will still have problems.
Phil Bates
'67 MGB
'58 MGA
misc others
> Might as well try it.
>
> Don't go the blanking sleeve route, though -- a lot of folks seem to
have
> this kneejerk reaction to blame the thermostat, when if everything
else
> was
> working right, the thermostat would not be an issue.
>
> Have you replaced the radiator diaphragm seal? It is important in
> directing
> the air through rather than over the radiator.
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