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chadmaisel2
 Post subject: 0-290D2 MAX RPM
PostPosted: Sun May 17, 2020 4:55 pm 
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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


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James Grahn
 Post subject: Re: 0-290D2 MAX RPM
PostPosted: Sun May 17, 2020 5:31 pm 
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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


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fytrplt
 Post subject: Re: 0-290D2 MAX RPM
PostPosted: Sun May 17, 2020 5:35 pm 
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As Cubes said, most RPM limits are on the prop.

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leewwalton
 Post subject: Re: 0-290D2 MAX RPM
PostPosted: Sun May 17, 2020 5:39 pm 
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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.

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chadmaisel2
 Post subject: Re: 0-290D2 MAX RPM
PostPosted: Sun May 17, 2020 5:51 pm 
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Thanks guys, yes definitely not a prop limitation - it's designed for 2700.


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chadmaisel2
 Post subject: Re: 0-290D2 MAX RPM
PostPosted: Mon May 18, 2020 4:43 pm 
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Dang, picked up 8MPH - not bad cruising around at 190MPH on an o-290. Tried to upload a pic but keep getting an error.


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James Grahn
 Post subject: Re: 0-290D2 MAX RPM
PostPosted: Mon May 18, 2020 8:58 pm 
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That’s awesome! Now go smoke some RVs.
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chadmaisel2
 Post subject: Re: 0-290D2 MAX RPM
PostPosted: Mon May 25, 2020 12:17 pm 
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;)
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