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Post by smithy1 on Oct 27, 2021 23:19:29 GMT -5
Hi Shanaka, Thank you for your input. The clearance on one side of the compressor is about .004", however on the opposite side it's roughly .019", way too much. This weekend, I'll remove the front cover and add more Bondo or JB weld. Static balancing, isn't any where near accurate enough. I've used the prop balancer too, even machined a hub adapter to go from the 5/16" turbine hole to the 1/8" axel on the prop balancer with < .001" concentricity on the adapter. Problem is if you spin the adapter, you get different results, very frustrating. Regards Jeff Balance needs to be better than 10mg-in otherwise the bearings will not last more than a few minutes and it's possible the engine will just destroy itself. Smithy.
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Post by jetjeff on Oct 28, 2021 14:34:55 GMT -5
Hi Smithy,
Yeah, the GRW bearings in this engine are showing signs of wear (slight rumbling when you spin the rotor), even though total time on these bearings can't be more than 50 or so minutes.
Regards
Jeff
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Post by smithy1 on Nov 1, 2021 19:59:33 GMT -5
Hi Smithy, Yeah, the GRW bearings in this engine are showing signs of wear (slight rumbling when you spin the rotor), even though total time on these bearings can't be more than 50 or so minutes. Regards Jeff I have a Kingtech K180G and a K45G, both with more than 70hours on them ...on the same bearings....balanced them myself on an old 1980's Schenck CAB 960 balancing machine....(less than 1mg-in). Smooth as a babies bum, (not that I go around feeling babies bums though ). When I put a finger on the housing whilst running it's so smooth you wouldn't think they were running except for the noise. Smithy.
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Post by jetjeff on Nov 2, 2021 14:21:49 GMT -5
Hi Smithy,
Yeah, I wish I had access to one of those balancers. I did have the original turbine wheel balanced, and there was zero vibrations.
I was able to bond up the .019 gap on one side of the compressor wheel, so if it doesn't run now it never will. I'll try starting it in the next few days.
Regards
Jeff
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