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Knock Knock and Oil to Cam

Subject: Knock Knock and Oil to Cam
From: "Frank van Dalen" <F.vanDalen@LR.TUDelft.NL>
Date: Thu, 30 Nov 1995 17:07:56 +0100
I think you got it wrong John...

Each piston has combustion once every 4 strokes of 180 degrees, ie once every
two crankshaft revolutions. If there was a knock from one piston/rod, you would
hear it 500 times per minute at 1000 RPM, ie 500/60 = 8.33 times per second.
The camshaft goes round at half the speed of the crankshaft, 4.17 a second,
which is the frequency of the knock in question. Or have I gone mad?


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