G62 Compression Test
11-20-2007 | 01:37 PM
#2
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From: mims,
FL
RE: G62 Compression Test
im not sure what the compression should be on this motor, but 118 sounds pretty good. how much time is on this engine?? are you having problems with it??
11-20-2007 | 04:04 PM
#8
RE: G62 Compression Test
ORIGINAL: Pat Roy
Two things I should have added to the above.
1) Has the fuel filter been changed and the carb screen cleaned?
2) Has the plug been checked and changed?
Do those before looking at the rings.
Two things I should have added to the above.
1) Has the fuel filter been changed and the carb screen cleaned?
2) Has the plug been checked and changed?
Do those before looking at the rings.
11-20-2007 | 05:48 PM
#11
Senior Member
RE: G62 Compression Test
ORIGINAL: mrbigg
I did a compression test on my G62 and got about 118psi, flipping by hand. Is it time for new rings?
I did a compression test on my G62 and got about 118psi, flipping by hand. Is it time for new rings?
So if your engine has a compression ratio of 7, you should read 7 Bar (!100 psi) 118 seems not bad at all! I am inclined to suspect your engine/muffler/prop setup as being responsible for the lowish power you have.
11-21-2007 | 01:18 PM
#14
RE: G62 Compression Test
Just tested a new g-62 this last week. We fly at 5,000 feet so our engines will be a little down on what you should be getting, but here are the results. 22x8 BME prop-7200, 22x8 menz--7000, 22x8 mejelik-6700, 20x8x14 Zinger 7000. Of these props, on a TF-47, the Zinger gave the best performance. The BME and Menz were very close and the Mejelik was good but not quite as good. Trying a 20x10 mejelik gave results similar to the zinger. I would think that your Mejelik prop is probably a little too much for the engine combo you are using. Also we are using Bennet mufflers. Very low restriction. Going to 32 to one oil saw a slight increase in rpm over 50 to one.
Larry
Larry
11-21-2007 | 01:46 PM
#15
RE: G62 Compression Test
ORIGINAL: larry@coyotenet
Just tested a new g-62 this last week. We fly at 5,000 feet so our engines will be a little down on what you should be getting, but here are the results. 22x8 BME prop-7200, 22x8 menz--7000, 22x8 mejelik-6700, 20x8x14 Zinger 7000. Of these props, on a TF-47, the Zinger gave the best performance. The BME and Menz were very close and the Mejelik was good but not quite as good. Trying a 20x10 mejelik gave results similar to the zinger. I would think that your Mejelik prop is probably a little too much for the engine combo you are using. Also we are using Bennet mufflers. Very low restriction. Going to 32 to one oil saw a slight increase in rpm over 50 to one.
Larry
Just tested a new g-62 this last week. We fly at 5,000 feet so our engines will be a little down on what you should be getting, but here are the results. 22x8 BME prop-7200, 22x8 menz--7000, 22x8 mejelik-6700, 20x8x14 Zinger 7000. Of these props, on a TF-47, the Zinger gave the best performance. The BME and Menz were very close and the Mejelik was good but not quite as good. Trying a 20x10 mejelik gave results similar to the zinger. I would think that your Mejelik prop is probably a little too much for the engine combo you are using. Also we are using Bennet mufflers. Very low restriction. Going to 32 to one oil saw a slight increase in rpm over 50 to one.
Larry
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