RE: GRPRO 26
Hi Guys,
I promised that I would post results today and that is what I am doing. Ran the motor yesterday evening. Now please bear in mind: I am at 6800 feet ASL fuel used 93 octane 32:1 Castrol TTS about two weeks old (the mix) weather very very dry at about 30 degrees C.
Choking the motor is a nightmare, without the cowl I can reach through the firewall and put my finger over the carb opening (remember no choke) once the cowl is on, there is no way I will ever get to the back of the carb.
Started the engine with a starter, and it took very quickly and was purring away with a JFX 16X8 prop. I let it warm up and opened the throttle to about 1/2, by now it was evident that something was not right. The engine was not running smoothly...I tried to tune it like I always do, L-end first to obtain Idle, and then the H-end to obtain max RPM, but the engine was not running cleanly. Then I stopped it an loosened the ignition pickup (the way its fitted, you can not move it at all, you will have to take one screw out completely to move it to either side.) I advanced the timing as far as it would let me, with one screw removed and restarted the motor, this time by flipping it. I started on the 3rd flip and it was immediately running smoother. I let it warm and opened the throttle, low end was a bit lean for a clean transition so I richend it ( It’s very easy to adjust this engine while it is running, as the needles are on top of the rear mounted carb far off the prop). Now there was something happening, it ran very nicely, idle at 2000RPM constant, instant transition and a good clean top end. I tach't it at 6900RPM on the 18X6 JXF, thinking that this is poor. I let it sit at idle for a while and the decided to put on a Menz S 18X6 prop. Restarted (with a starter) and it was running well. Let is sit at just above idle for about 5 minutes and opened it up, transition was not instant, but good with a slight amount of splutter (this might be what PE had experienced with the case filling) now the engine tach't at 7300RPM steady with the 18X6 Menz. It was left to idle some more and after about 5 more minutes, it tach't at 7400 on the 18X6........So, would I recommend it...I think so, its easy to handle and except for the ignition being retarded to far, it ran flawless, the power is not very good, but it is apparently getting stronger. It comes with a nice muffler that has to prove itself, Vibration is very little and it starts easy (with a starter). I think it's quite good, I will report back about what it will do in the air after the weekend.
Regards
Andreas