in a 4 cylinder four stroke engine, how many times does the spark plug ignite if the engine is idling at 800 rpm

Asked by Mar 28, 2015 at 09:49 PM about the 1998 Toyota RAV4 4 Door L Special Edition

Question type: General

I'm confused on something this simple. Could someone please explain.

2 Answers

505

The spark plug to each cylinder will ignite once per engine revolution. So, at 800 revolutions per minute each spark plug will be sparking 800 times a minute.

I've always thought it would be 800 rpm divided by 4 (cylinders) because the crankshaft operates with a total of all the cylinders

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