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Old 11-22-2014, 09:55 AM   #7 (permalink)
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Ever spun a camshaft with a wrench Neil? With all the valve train except the timing chain connected.

The reciprocation of the piston mass and a portion of the conn rod, means you are accelerating and decelerating each of those masses 8 times per combustion stroke (2 revs of the crank). Exponentially greater losses than valve actuation losses.

regards
mech
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