Pontiac Solstice Forum - View Single Post

More answers but new questions:
Is this right? As I interpret it, their Variable Valve Timing does only that, it advances and retards the intake and exhaust cams at higher RPMs and changes overlap. There's no change in lift or duration. and it does it with the oil pressure?

I like that there's a timing chain and not a belt. That's $250 every 80,00 miles I won't be spending on a new belt.

Anybody know if that chain is driven on steel (not plastic) sprockets? I've had to replace the plastic sprockets on two GM 305's.

Also does anybody know (don't know the term) if the valve travel encroaches on the area occupied by the piston at top dead center? Honda's and Toyota's do. On their motors, if the timing belt breaks, the engine is trashed. The same would happen with a plastic sprocket.

But, I love the new info.

	DreamerDave Founding Member Join Date: Apr 2004 Location: Kemah, Texas	More answers but new questions: Is this right? As I interpret it, their Variable Valve Timing does only that, it advances and retards the intake and exhaust cams at higher RPMs and changes overlap. There's no change in lift or duration. and it does it with the oil pressure? I like that there's a timing chain and not a belt. That's $250 every 80,00 miles I won't be spending on a new belt. Anybody know if that chain is driven on steel (not plastic) sprockets? I've had to replace the plastic sprockets on two GM 305's. Also does anybody know (don't know the term) if the valve travel encroaches on the area occupied by the piston at top dead center? Honda's and Toyota's do. On their motors, if the timing belt breaks, the engine is trashed. The same would happen with a plastic sprocket. But, I love the new info.