> I'm still puzzled about the Race of Champions. They raced several designs 
> of car which seemed to be using *external combustion* to propell 
> themselves, rather than the more traditional *internal combustion*. (As 
> evidenced by the huge flashes and bangs as they raced round the track.)

That's quite common on race-tuned carburetor-engined cars, under certain 
circumstances they simply pour so much fuel into the engine that some of it 
goes unburnt through the exhaust system and ignites once the exhaust 
mixtures mixes with enough oxygen in the atmosphere.

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