Paul:
The current unit that Moss carries performs both services.
http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=58155&Sort
Order=1
It restricts flow through the bypass passage (the passage is in all B
series blocks) and also reduces the diameter of the thermostat mounting
passage slightly giving the same diameter as a fully open thermostat.
The current available unit is configured after the factory part number
11G176 as supplied on the factory race cars.
I do not recommend using this on the street. I'd qualify it as a race
only part though Moss is happy to sell them to anyone. I think the text
I wrote for catalog and website gives a pretty accurate representation.
Btw. The bypass passage in the B series engines is fairly small, so the
effect on cooling from using this blanking sleeve or the original style
bellows thermostat is pretty minor. Engines such as the Jaguar 3.8L and
Triumph TR2-4 have much larger bypass passages and will get a
significant improvement by using the bellows style blanking thermostat.
Kelvin Dodd
> -----Original Message-----
> From: mgs-bounces+doddk=mossmotors.com@autox.team.net [mailto:mgs-
> bounces+doddk=mossmotors.com@autox.team.net] On Behalf Of Paul Hunt
> Sent: Thursday, October 18, 2007 1:46 AM
> To: RampantNM@aol.com; mgs@autox.team.net; MG-MGB@yahoogroups.com
> Subject: Re: [Mgs] Thanks
>
> I've see 'blanking sleeve' applied to two different things. One is on
an
> A
> and possibly a 3-bearing B and restricts the flow of coolant through a
> port
> which bypasses the thermostat to give a quicker warm-up. I'm not sure
> whether this is relevant to 5-bearing Bs. The other is a restrictor
used
> *in place of* the thermostat, to restrict the flow of coolant through
the
> engine and radiator to that which would occur if a thermostat were
fitted
> and fully open. These are often used by racers as the thermostat is
> superfluous but could stick closed. Running without one of these *or*
a
> thermostat causes a greater coolant flow rate through the engine,
which
> causes turbulence, which can result in local recirculation and
hot-spots.
> But for the purposes of brief testing when looking into a possible hot
> running problem this restrictor isn't required, although one can be
> fashioned out of an old thermostat by removing the spring and pellet
and
> just leaving the disc.
>
> PaulH.
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