Hi Guy ,
I believe they are talking about "A" series engines here .
Mark Hanna
AN5L/13731
> -----Original Message-----
> From: Guy [SMTP:Guy@weller-lakes.freeserve.co.uk]
> Sent: Thursday, May 06, 1999 11:54 AM
> To: wizardz@maxinter.net; Jeff Boatright; spridgets@autox.team.net
> Subject: Re: Heater Control Valves
>
> Just checked out my (UK spec) 1978 1500.
> The heater circuit seems to have little to do with the circulation of
> water
> to the block or head and I can see no way that it should effect the
> cooling
> effect to any individual cylinder.
> First there is a cicuit from the thermostat housing at the front of the
> cylinder head, through the heat exchange set up for the carbs (SUs) and
> back
> to the water pump. This operates all the time, flow being controlled only
> by the thermostat valve which will help with quicker warm up of the carb
> inlet manifold in cold condtions.
> The heater circuit is a sub-circuit off this, and has no direct connection
> to the block.
> There are two "T" connections to the inlet manifold heater pipework, both
> near the rear of the engine, with a valve in this to close it off when no
> heater is required. When ther valve is open the water supply must be
> shared
> between the manifold and the heater core. The circuits are in parallel,
> not
> in series.
>
> Guy
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