Hi Simon,
I'm afraid you've drawn the wrong conclusion from your expreience with
the '74 B. I have a '69 B that comes up to temp and puts out plenty of
heat in sub-freezing weather. You probably had a 160 degree thermostat,
or maybe none at all in the engine which kept it from warming up more
than that.
The thermostat opens at its preset temp (approx) and that's as cool as
the engine can run. After that the engine temp is up to the cooling
system in whatever driving conditions are encountered.
Charley Robinson
'69 B
Simon Matthews wrote:
>
> Pre-'75 cars will not come up to temperature in cold weather, whatever the
> thermostat -- remember the oil cooler is also providing engine cooling and
> some water goes past the thermostat.
>
> I know this because I drove my '74 MGB (US spec) 70 miles during one trip
> when the temperature gauge barely moved off the low mark.
>
>
> Simon
>
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