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G62 Compression Test
I did a compression test on my G62 and got about 118psi, flipping by hand. Is it time for new rings?
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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??
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RE: G62 Compression Test
Bought it used a while back. I think it's 2 to 300 rpm low. Runs good though and is easy to start. I played with the timing a while back and got no gain there.
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RE: G62 Compression Test
ORIGINAL: 2 to 300 rpm low. Runs good though and is easy to start. |
RE: G62 Compression Test
i would wait for the right reply on this issue before doing anything.
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RE: G62 Compression Test
A 300 rpm drop from new peak indicates that either the state of tune is way off or the rings are worn if everything else is the same.
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RE: G62 Compression Test
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. |
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. |
RE: G62 Compression Test
Are you using a different muffler?? Some are very restrictive
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RE: G62 Compression Test
I used the slimeline pitts and the abell r/c side dump. Here's a nice read.....[link]http://www.pumaracing.co.uk/comp.htm[/link]
[link]http://www.dansmc.com/compression_test.htm[/link] |
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? 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. |
RE: G62 Compression Test
23x8 Mejilik at about 6350. Either muffler don't make a difference. I just picked up a tuned pipe. I'll see what that does. I'm still going to throw some rings in it. Easy to do and not exspensive.
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RE: G62 Compression Test
Go straight to Frank Bowman for the rings :)
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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 |
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 ghhdh |
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