Rodney Zapf wrote:Well, that didn't take long, the only reason 2550 is the limit is because Lycoming says it is the limit--why isn't the geared engine limited to 2550? It is the same powerplant! Sure don't want to start a fight, just looking for correct answers and the reason for them-- So many of the LYC 0-145 owners complain about the HP being 10 to 15 hp less than 65, take a look at what it puts out with just a few more rrrr's. If you can, please explain to me why the 0-145 is limited to 2550. I can understand anything except the "book says so". I would like to know why the book says so then turns right around and says the G motor can turn more (rrrs are measured at the engine, not the prop) More Rrrr's might shorten the TBO a smidge, but other than that, 2550 is a very slow RPM. Rod
Well, it is "slow," but my engine is 70 years old, rebuilt in 1979.
My motorcycle will rev to 14,500 redline.
But neither is meant to run at redline consistently.
So I take the Lycoming manual as the wisdom of the guys who actually built the engine, and figure if they said 2550 is max RPM with a new engine, I should probably take heed.
Just my humble opinion, of course!