"Bob Chilcoat" wrote in message ...
My partners and I have all noticed that takeoff roll and climb in our Archer
is a bit long and anemic, respectively. The partner who has had a share the
longest has said that normal TO RPM has always been around 2,250. One of us
recently flew a Cherokee 180 (same engine) that climbed much better and got
over 2,500 RPM during TO. We have roughly 1,500 SMOH on the engine, and
compressions are all in the 70's. Someone on the Piper group suggested that
the muffler might be plugged. The POH says nothing about normal static RPM.
Any thoughts?

Whups, hit send too soon on my other post.

My thought which I haven't heard mentioned elsewhere is, check
and double check the carb heat to be sure it's really OFF when
the control is in the off position. A worn carb heat actuator
arm or valve which isn't really quite seated "closed" can easily
cost you 100 rpm.

Cheers,
Sydney