Surging

[flyingfool]

I see this is an old thread but wanted to say thanks and pile on.
Governor in question is a P-860-4 REV-E with an IO-360, and Hartzell Prop, RV-7.
Experiencing RPM oscillations on takeoff, it would bounce back and forth between ~2530 - 2670 RPM. If you weren't ready for it , it could put you back on the runway after rotation
The blogs all suggested it was the governor being too old of a REV.

Finally got it out to the MT guys in FL, they were helpful and responsive. I had to pay for the rebuild (had been 7 years) but this rework fixed the issue have a rock steady climb RPM.
Something about the speeder spring (I think) It is now REV-H
Anyway ... thanks

[Ted RV8]

Had the same problem with an MT governor and it was long before the Hartzell Composite prop existed.

Switched to a PCU5000 built for me by Aerotech(now Aircraft Propeller Service). Been completely trouble free since.