[Spridgets] First oil change & break in

[Karl Vacek]

Depends - redlines are typically much lower than high-preformance cars,
anywhere from 2100 to 2800 RPM usually.  But remember that the RPM is related
to stroke length, and aircraft generally have longer strokes than cars, so
maximum piston surface speed isn't all that much lower.  RPM's are usually
limited in aircraft by propeller tip speed, though.  If the tips go supersonic
the prop loses efficiency and noise is high - think of an aerobatic  plane in
a dive at an airshow.

Point is that slow running at light throttle during break-in glazes cylinders.
You want to maximize the pressure in the cylinders, and that comes at wide
throttle settings.

Karl




  OK, very interesting.

  My only question is what kind of rpm do piston aviation engines run at?

  Regards

  Daniel1312