TJCF16
Well Known Member
I have an RV-9A with a O-320 and a C/S prop in it. I was flying at 10,500 ft and started a decent. I pulled the throttle back but the Digital RPM gauge showed the rpms at redline. The engine was running well below redline as the manifold pressure was 15. At the time I contributed it to the turbulence i was encountering.
Today was the first flight I went on since the above incident. After 1000ft agl i brought the throttle back to obtain 2200 rpms, however: i kept bringing throttle back but but the RPM was still showing over 2400 and the manifold was at 12. The engine was definitely at close to idle. I advanced the throttle as to stay flying and the rpm was showing redline.
So I have an indication problem. I have a light speed ignition and a slick Mag. I did not build the airplane, so I was tracking down where the TACH gets its signal from. I confirmed it comes off the MAG by disconnecting the wire on the mag and running it. I had no RPM indications.
With that said I am not sure wether the MAG's output is bad or is it the TAC. I have an EII (Electronics International Inc) R-1 RPM indicator. Does anyone have any suggestions on which way to proceed? Oh, during sunup and mag check everything was fine.
Tim Crouch
Dues Paid 2016
Today was the first flight I went on since the above incident. After 1000ft agl i brought the throttle back to obtain 2200 rpms, however: i kept bringing throttle back but but the RPM was still showing over 2400 and the manifold was at 12. The engine was definitely at close to idle. I advanced the throttle as to stay flying and the rpm was showing redline.
So I have an indication problem. I have a light speed ignition and a slick Mag. I did not build the airplane, so I was tracking down where the TACH gets its signal from. I confirmed it comes off the MAG by disconnecting the wire on the mag and running it. I had no RPM indications.
With that said I am not sure wether the MAG's output is bad or is it the TAC. I have an EII (Electronics International Inc) R-1 RPM indicator. Does anyone have any suggestions on which way to proceed? Oh, during sunup and mag check everything was fine.
Tim Crouch
Dues Paid 2016