> So the 2575 is really a conservative max rpm.
>
When Continental developed the O200 they made changed to the case to
strengthen it, particularly in the area of the center main bearing. The
center studs were replaced with through bolts. Prior to that the
maximum continuous RPM allowed was (IIRC) 2575. The C90 was certified
for 2625 RPM and 95 HP but with a 5 minute limit.
Also, as Hartmut pointed out, there are differences in the valve train.
The C90 and O200 have forged hardened cam shafts whereas the C85 and
down were cast. Valve springs are different, too, and some versions
have 3 springs where others only use 2.
Bottom line, if you exceed 2575 RPM you're a test pilot and all bets are
off.
John
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