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Cox .15 Medallion Piston

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Cox .15 Medallion Piston

Post  Cox International on Tue Dec 04, 2018 12:53 pm

The .15 Medallion conrod usually has the traditional "ball-joint" connection to the piston but we have come across at least one that was a "pin" version, like the .15 TD Special. Was the latter version only supplied for certain build years?

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Re: Cox .15 Medallion Piston

Post  Levent Suberk on Tue Dec 04, 2018 3:18 pm

Cox TD .15 Special has been manufactured between 1961-65. So I think that pin style pistons assembled to Medallions between these years. (Production date from MH Aerotools web site)
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Re: Cox .15 Medallion Piston

Post  Cox International on Tue Dec 04, 2018 3:34 pm

Thanks and that is what I was thinking as well.
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Re: Cox .15 Medallion Piston

Post  Cribbs74 on Tue Dec 04, 2018 4:54 pm

To be honest I have never followed the Medallion line, I do know they came with either. Early had ball sockets, later were pinned. I don’t know how long Medallion .15’s were made. I would be willing to bet that the piston pin was used until end production.
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Re: Cox .15 Medallion Piston

Post  Jason_WI on Tue Dec 04, 2018 6:03 pm

I think the later versions had the issue with the piston catching the port edge during running. It happened to me on one engine. That piston and cylinder were ruined. I believe a few other members had that happen as well.
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Re: Cox .15 Medallion Piston

Post  Ken Cook on Tue Dec 04, 2018 6:14 pm

Jason, I experienced this twice. I still have 2 in the case which I will probably never run. Sadly, the cases have been beat up a bit. I also know some others in which that happened. When it stops, it's quite aggressive.
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