Thorp Air Command - T18.net

In the lycoming manual is says my engine is rated at 2600 RPM. I've got a whirlwind prop and I find that 10-15 sec after I level off if I don't pull out the throttle I can get much higher than 2600 RPM so I have to manage that after cruise, descending, etc. I see other guys say they are running WOT with their 290's and running much higher than 2600 RPM. My question is there any reason I can't go higher? Am I going to damage something, wear something much faster, etc, etc?

Thanks

Chad

Reno racers I’ve talked to go as high as 3500rpm. You will, mostly likely wear the engine a bit faster. But the biggest problem I know of is that the valves can float. If stock springs are used, you can possibly hit a piston with a valve.
Might ask your prop manufacturer if there are any harmonic issues above 2600.
Cubes

As Cubes said, most RPM limits are on the prop.

_________________
Bob Highley
N711SH
SN 835
KLAL

Yeah it’s “rated” at 2600 ... the motor can spin up ... I’m confident if you want to run it to 2700 you’re fine. The prop was most certainly built with that number in mind.

_________________
Lee Walton
Houston, TX
N51863,N118LW
KEFD

Thanks guys, yes definitely not a prop limitation - it's designed for 2700.

Dang, picked up 8MPH - not bad cruising around at 190MPH on an o-290. Tried to upload a pic but keep getting an error.

That’s awesome! Now go smoke some RVs.
Cubes