Gasoline engine without spark plug

[ggdorm]

My 7.5 cc (os 46 ax) is 1.65 hp and 16 rpm to be precise.
This gives 1.214 kw so 1.48 l / kwh.
In fact, consumption is exorbitant ... To remain competitive in relation to engine size and on-board weight, it is impossible for them to improve consumption. It's really a shame this waste, I will be curious to calculate the performance of its micro-motors! What understand the breakthrough of the electric in the world of model making ...

[oiseautempete]

u
this consumption is not due to poor ignition: thermodynamics is very unfavorable to too small engine

Error:
Certainly thermodynamic level there is an effect of volume, but the unburnt is the lack of advance: the duration of combustion is fixed, so the faster the engine the more you have to put in advance ... Besides I recently repaired an old car that no longer had power and consumed 18L per 100 instead of 9, which is exactly double ...: it was the distributor's feeders in advance that were seized ... CQFD