Over-rev of 2.0 Liter Four, Need to Replace a Valve Options

[motorvated]

Missed a shift and over-revved the engine and leak down indicates that I have bent the intake valve on Cylinder #1. So I will need to replace it with something. Should I try to source a factory replacement valve, new or used, or an aftermarket steel valve. At this point, I am not planning on replacing all the valves, so what is my best option for replacing this one valve. Would a good straight used intake valve be acceptible, or is that being too risky? All comments welcome.

[Jack Standz]

Might consider waiting until you tear down the motor to inspect and assess the entirity of the damage done. Let us know how that goes & you'll likely get better suggestions on a path forward.

In the meantime, a good suggestion is to invest in a rev limiter (you indicate a missed shift and not a mechanical over-rev from downshifting to the wrong gear). As simple as a special ignition rotor or as complex as an ignition system with a rev limiter.

[motorvated]

Might consider waiting until you tear down the motor to inspect and assess the entirity of the damage done. Let us know how that goes & you'll likely get better suggestions on a path forward.

In the meantime, a good suggestion is to invest in a rev limiter (you indicate a missed shift and not a mechanical over-rev from downshifting to the wrong gear). As simple as a special ignition rotor or as complex as an ignition system with a rev limiter.

It happened on the track and might have been 4th to 1st (instead of 3rd) downshift that brought the revs up to around 7K+. Then a loss of around 15-20% power. Rev limiter wouldn't have helped since this was a mechanical over-rev. I'll open it up and assess the damage. And I've learned my lesson and I'll be upgrading my shift linkage to clean up the shifting and hopefully not do this again.