Author Topic: Why Does a Saw 4-Stroke?  (Read 1671 times)

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Offline Chris-PA

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Re: Why Does a Saw 4-Stroke?
« on: December 30, 2016, 09:48:33 pm »
I have always understood it is a function of speed and fuel/air mixture. The engine speeds up to a point where it runs out of fuel and is overly lean, it momentarily drops back then starts revving again. Once it is under load it doesn't rev high enough to run out of breath.
But at 10,000rpm a revolution takes 0.006s, and when it's 4-stroking it will fire every other one.  I have a hard time believing it's actually changing speed back and forth that rapidly. 

Also, if it were going lean at higher rpm that caused it, then how would turning it richer cause it to 4-stroke more?

 

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