Valve Timing Specs?

[DanH]

Working on a project. Need the intake valve timing, preferably for a roller cam angle valve. It would save some time if someone here had the specs.

Lycoming said no to the request, despite that fact anyone with an engine can measure it.

[lr172]

Good luck. I have looked for a while and can't find any valve timing specs. I am sure the folks that make aftermarket cams for high performance applications have the OEM specs. Can't remember the names of the companies making them though.

Larry

[rocketbob]

Many valvetrain-related problems could be easily diagnosed if lift specs were published. Why this is not...who knows.

On the roller cams they actually detuned the cam profile, because they would make more than certified power and the FAA doesn't like that.