Quote:
Originally Posted by Clifford Pope
Most older engines surely have the same basic tappet arrangement - the camshaft pushes a flat surface of some sort which then pushes either a pushrod or the valve itself. If the valve spring has the same strength then the scraping action of the camshaft lobe on the flat surface will be the same?
Some more modern designs have a roller which runs on the camshaft lobe, so the friction is reduced. But no 240s?
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Rocker shafts on pushrod engines are geared. You also have the weight of the pushrod and follower acting on the cam and the face is much smaller