How many times does the spark-plug fire
Answers:
Spark plugs fire at the top of the compression stroke. That happens once for every rotation of the crankshaft. So it depends on how many rpms your engine is doing at the time (observable on your tachometer). If your engine is idling at 1000 rpms each of your plugs is firing 1000 times a minute.
The spark plug is fired once every two revolutions of the crankshaft on a 4 cycle engine, so at 1000 rpms the spark plug fires 500 times.
Poprivet is right and I stand corrected. They do fire every other rotation of the crankshaft.
The true answer is once every 4 rotations in a 4 cycle engine and once every other in a 2 cycle engine.....
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Relevant answers:
Depends on the size of your engine. IE if, you have a 6 cylinder (v-6) it requires 6 spark plugs etc.
4st
Four plugs, one per cylinder.
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