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Bob
I would suggest that with a 12 volt coil you are only getting about 
15000 volts at the plugs, instead of about 30000 volts with a 6 volt 
coil,so the engine does not start easily and runs rough,especially 
under load.
cheers                             
All the various models call for a 6 volt coil in
> conjunction with the in-wire ballast resistor. The car has a 12 volt  Lucas
> coil. What connection does this have to the running problems? FWIW, this car
> has been modified to 2500TC specs with a 150HP PI cam.
> 
> Bob Kramer
> TR4, TR4A, TR6, 2.5 Saloon
> rgk@flash.net
Mike Kitchener
60 TR3A TS 75178
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