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.09 Con Rod Hole Empty .09 Con Rod Hole

Post  Iceberg on Tue Jun 18, 2019 8:50 pm

I have an .09 piston that the con rod has a small hole in it. I have seen them plugged before is this normal? If so why the different pistons?

.09 Con Rod Hole _09_co10

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.09 Con Rod Hole Empty Re: .09 Con Rod Hole

Post  balogh on Wed Jun 19, 2019 12:49 am

Ice it is the first production runs of 049 and 09 TeeDee-s that came with that oiling hole. COX later may have recognized that the lubrication of crankpin is equally good without this hole and abandoned it to save manufacturing costs.

I was wondering if the large end of the rod with this oiling hole had a bit smaller diameter eye for the pin for a tighter pin to rod fit, that was also increased when the hole was abandoned, in order to facilitate the access of oil in between the pin and the eye, but I cannot measure such tiny differences if there is any at all. At least the pin to rod fit looks visually tighter in my old stock 049 TeeDees with the oiling hole on them.
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.09 Con Rod Hole Empty Re: .09 Con Rod Hole

Post  Iceberg on Wed Jun 19, 2019 1:05 am

Thanks Balogh!
Good explanation.

The Piston you sent hadn't arrived. Hopefully soon. I'll be in touch via PM.

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