Prop pitch adjustment?

[kbalch]

While conducting a full-power runup today prior to first flight, I determined that, with 2650 RPM indicated, I still had about two inches of throttle travel left to go. Clearly, going to full throttle on takeoff would result in overspeeding the engine.

This is a -14A with the standard IO-390 and Hartzell scimitar setup. My G3X is set for the P-mag?s required 2 pulses. I used the Van?s-supplied control cables and all were setup per the manual.

Do I need to adjust the prop?s low pitch screw to achieve 2650 RPM on full-throttle static runup or is this a governor issue?

[Birkelbach]

It sounds like you need to adjust the low pitch stop on the propeller. Pretty common. I had to do it on my RV-7 as well. I was getting 2800 or so WOT.

[BobTurner]

You need to do both. First, adjust the prop?s fine pitch stop so the RPMs just reach red-line as the throttle is full forward (sea level, no wind). Then adjust the governor until the rpms come down to 2640, then re-adjust to barely get back to 2650.

[kbalch]

Makes sense, guys; thanks. Tomorrow's task...

[propjoe]

Clear direction given in Hartzell owners manual 115N. Look on page 6-33:
https://hartzellprop.com/wp-content/...000-R23-WA.pdf