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JamesWilson
Yoda
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HELP!
I have a 1275, twin carb MG Midget engine in my Rochdale Olympic kit car.
It starts well when cold and runs fine, both at idle and at speed.
Dwell and timing seem spot-on. The plugs, wires, distributor cap, rotor, condensor and coil are all new or new-ish. It is not impossible that one may be faulty, but they all seem to work OK when cold....
It has a new thermostat, water pump and radiator (for a 2.6 liter London Taxi, because the original was too prone to overheating it had a small area and low capacity- this fix seems to allow it to come up to operating temp and stay there regardless)
The problem is that I can take it out for a drive and after 4-5 miles it starts to act like it's overheating, mis-firing and running increasingly poorly until it stalls and dies. It will not restart. But if left to cool almost completely down it can be restarted and runs as though nothing happened.
I'm at a complete loss to explain it.
I thought it might be vapor lock but there's fuel in the carb float chambers and in the underhood fuel filter. There is no heat shield between the exhaust and the carbs. Ive not had this problem before.
The coil seems quite hot, but swapping it for a cold spare one doesn't fix the problem.
The temp guage never goes above the normal range and the coolant doesn't seem excessively hot.
The only explanation I can now think of is some kind of internal bloackage to coolant flow in the engine block that causes localized overheating....
Any ideas/suggestions?
I have a 1275, twin carb MG Midget engine in my Rochdale Olympic kit car.
It starts well when cold and runs fine, both at idle and at speed.
Dwell and timing seem spot-on. The plugs, wires, distributor cap, rotor, condensor and coil are all new or new-ish. It is not impossible that one may be faulty, but they all seem to work OK when cold....
It has a new thermostat, water pump and radiator (for a 2.6 liter London Taxi, because the original was too prone to overheating it had a small area and low capacity- this fix seems to allow it to come up to operating temp and stay there regardless)
The problem is that I can take it out for a drive and after 4-5 miles it starts to act like it's overheating, mis-firing and running increasingly poorly until it stalls and dies. It will not restart. But if left to cool almost completely down it can be restarted and runs as though nothing happened.
I'm at a complete loss to explain it.
I thought it might be vapor lock but there's fuel in the carb float chambers and in the underhood fuel filter. There is no heat shield between the exhaust and the carbs. Ive not had this problem before.
The coil seems quite hot, but swapping it for a cold spare one doesn't fix the problem.
The temp guage never goes above the normal range and the coolant doesn't seem excessively hot.
The only explanation I can now think of is some kind of internal bloackage to coolant flow in the engine block that causes localized overheating....
Any ideas/suggestions?
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