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post #2 of (permalink) Old 01-15-2019, 12:19 AM
machine.gun.kelly's Avatar
Join Date: Sep 2016
Location: Graceland
Posts: 451
The biggest problem with over revving, is valve float (the valve spring can't return the valve to the seated position fast enough to follow the cam profile). When valve float happens, the heads of the valves may tangle with the crown of the piston. Since the valves are at an angle (the axis of the valve is not coincident with the center line of the cylinder bore) to the piston, the valve will get bent or even break off. If the valve is bent enough to cause it to stick in the valve guide, you will see a loss of power. Since the engine is still running, none of the valves broke off. To get a warm, fuzzy feeling about that engine, you can run a bore scope down in through the spark plug hole and look for indentations in the piston crown. If none, no harm, to foul.

The over rev probably happened on a down shift...

Whoever said that island life is great was never committed to Alcatraz...
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