Originally Posted by
kevarc
Ran another tank through mine this one mostly around half throttle and above. All cylinders were around 180 most of the time and i was using a 24x12 2 blade prop.
The rpm at half throttle was about 5,000 and it went up to around 6000 near full. As I approached full the rpm dropped off.
As i reduced the throttle .the rpm would pick back up. Other than that the throttle response was pretty smooth.
I have watched the tuning video Saito has and not sure how to apply it to the gas motor.
I reduced the low speed until the rpm dropped and the opened a half turn.
Adjusted the high speed a little but did not want to get it too lean.
Any advice on how to go about the tuning would be appreciated.
Thanks
Kevin
Kevin, I set the high speed about 1/8 turn richer from max RPM and leave it there, it has a slight miss on the test stand. Do the low speed until it transitions good, then richen it up about 1/8. Lot of people try to get max power, good way to blow it up. If the weather ever cooperates I'll get the 190 up and see how it does in flight, I don't plan to run it at full power more than a few seconds anyway, should be fine. FYI my needles are 4 turns low, 2-3/4 high.
Tom