wes bender wrote......

"If you want to get picky, when a timing chain (or belt, for that matter) fails in an interference engine, the valves do NOT travel down at a high rate of speed and contact the pistons which are travelling upward. The valves become stationary, some in the open position, and the pistons contact them on their upward stroke".
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My response is........

wes bender (or larry?),
Just suppose a belt/chain fails while the engine is turning at 5,000 revs....are you suggesting that the camshaft just instantly stops dead?....In fact, there will be a certain amount of momentum (or energy) whereby the camshaft will still be operating the valves during the milliseconds it take for valves and piston to meet...therefore i maintain that at least one of the multi valves would be travelling down as a piston comes up to meet it.




ps....maybe a less aggressive attitude would be in order!