All rpm indications were within spec (for static run-up, etc). When on
the takeoff roll, rpm was about 2100, which seemed low, but there is
no spec in the POH for rpm for the takeoff roll. The rpm went much
higher after we were cruising (2300 or so).

Look at the TCDS (3A12) and you'll find static RPM limits. Go he
http://www.airweb.faa.gov/Regulatory...keModel.nsf/0/
EE81A0B13ADB620986256E2B0054B119?OpenDocument

Static RPM, I would think - flame on, is a pretty good indication of overall
engine health. At least it's a place to start. Only 2100 during the takeoff
roll sounds like something ain't right.

Has it been this way since last Summer?

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