Quote:
Originally Posted by niky
You can implement VVT with gear-driven cams. The mechanism for variable timing is in the gear on the camshaft, anyway, and doesn't care whether it's belt, chain or gear driven.
But those systems are complex and noisy. Almost completely maintenance free, though.
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I think Porsche, at least on the M96/97 engines, used variable chain tensioners to adjust timing instead of the usual on-camshaft actuator. However the chains wear grooves into the tensioners and I imagine that's not good for the engine's performance.