Frank,
Even if others advise you it's OK to spin a climb prop higher than 2400 rpm, I would, personally, never cruise higher than 2575 on a C-85 engine. As someone said, "Unlike a rotary engine, Continental pistons must constantly move in one direction, stop, move in the reverse direction, stop, and repeat the cycle over and over." There are a lot of individual parts involved and spinning them faster does add more strain, even if the engine is lightly loaded. So, don't over do it on rpm. I can't advise you to cruise higher than 2400 because I just don't know if it's OK. I once heard that on the O-200, Continental recommended staying with 2525 for max climb and max cruise. Fly happy and safely. Ed
