Camshaft revolutions

on the 3.4 s type do the camshfts go round twice to every once of the crank.

Hi Robert,

Nope, if I understand the question correctly, on all 4-stroke engines the camshaft(s) make 1/2 a turn when the crank makes a 360 degrees turn.

So for each complete camshaft rotation the crank makes two rotations. 2:1.

Cheers!

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As Pekka states, cams rotate at 1/2 the revs of the crank.