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Aluminum Cox .049 Pistons

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Post  NEW222 Mon Apr 22, 2019 1:16 am

Good job so far on the crankcase repair. However, I noticed one thing not mentioned throughout this. I will go back and re-read, but wanted to mention the oil groove. In the original cankcase nose, there is an oil groove for lubrication. Did you make one in your sleeve, or is it the fact that if using bronze, one would not need an oil groove?
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Post  NEW222 Mon Apr 22, 2019 1:19 am

I guess it would also be fair to ask. How long is your bushing? Is it the full length, or is it just near the tip of the crankcase? Great restoration of a run-out engine.
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Post  Iceberg Mon Apr 22, 2019 1:24 am

Hi I went just past the oil collector in the shaft. Exactly 4 mm. I am really impressed how much improvement was over aluminum.
Thanks
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Post  NEW222 Mon Apr 22, 2019 1:31 am

Thank you for clearing that up.
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Post  F4D Phantom II Mon Apr 22, 2019 6:43 pm

Hello Iceberg
                   I guess you placed the crankcase in the milling machine and bored thru or just place the crankcase in the jaws of the lathe and used the end mill on the tailpost. Thanks for posting the information. Let us know how it runs,great job!
                                                                                                   Juan
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Post  Iceberg Mon Apr 22, 2019 7:28 pm

Hi Juan
I used the milling machine to hold the block. Much easier to do accurately for me.
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Post  Iceberg Tue Apr 30, 2019 8:38 pm

After running the aluminum piston for the .049 I would not give much of a positive comment. It seemed to lose compression after only 4-5 runs. The RPM was not any higher I think than the normal piston. I think the aluminum was just an experiment is all. The block with bronze RC Plane  insert is undoubtedly awesome though.
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