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I was doing some reading* on this the other day, idly wondering if Triumph got the cooling system figures wrong
They didn't get their figures wrong because if they had then no car would run at the correct temperature!
They did however go wrong with the "expansion tank" system because it permits a situation where the level can drop within the engine but not the tank.
This is easily cured by using a proper header tank.
Further, the water pump design is poor leading to a hot spot at the back of the cylinder head. Again this can be overcome using more recent technology,
that is by the use of Evans Waterless Coolant, because unlike a water based coolant, EWC stays in contact with all surfaces constantly,
thereby removing the pump's tendency to cause cavitation (and the resulting hot spot).
Alternatively an electric water pump can be employed, however to plumb one in
properly involves reworking the car's plumbing a lot. A Stewart EMP pump
flows at 200 litres/minute and is guaranteed for 10,000 hours. Unfortunately these are not sold in Europe so have to be imported from the USA. The performance record
of they pumps speaks for itself.
With regard to Graham's overheating problem, I feel a more systematic practical approach is required.
The cooling system needs to be pressure tested first. The ambient temperature doesn't matter for this test.
Ian.