No one has answered so I will jump in with my first post. I am far from an expert, I just bought a 74 traveler in November. It has the Precision STC and the 7359 propeller. It has done some sitting prior to me and the compression is not that great. 74/68/73/71. I bought a digital tach so I am confident in the RPM numbers. 40 degree days in Seattle I get about 2330 RPM static. At 100 mph climb I get a bit over 2500. With stronger compression I would consider a 61 but I am more interested in getting off the runway than I am in going fast.

I hope using fly therapy the compression will get a bit better…

If history is any guide it should. I have seen many engine come up in compression over the years when they had a dormant stretch, but not all. You an try switching to W100 straight weight oil to help some say.

Fly it hard and often.

Cheers

Roscoe

I just had my Cheetah go through Fletchair and did the 160 hp STC and the Powerflow exhaust. I went with the 61″ prop and can really tell the difference. The climb is considerably better. I did it because it seemed like a waste of HP to get an upgraded engine and then not use it.

Thank you Roscoe, next oil change I will check the compression and if still low give the oil a try.

Powerflow exhaust should ship later this month. Will try to get as specific as possible on my before/after numbers.