Thread: How a Car Engine Works... for dummies.

Yaaaaay: Suck, squeeze, bang, blow.

Originally Posted by genki

But what about wasted spark? Some car uses waste spark (ignites on exhaust stroke) mainly because it's cheaper to have one coil handling 2 spark plugs at the same time than to have 2 smaller coils for each plugs.

Fires on the exhaust and power IIRC.