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Cox Engine of The Month
October-2018
Mudhen's

"Prototype T.D. .010 c.1960"



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Wanted: .020 Pee Wee cylinders

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Wanted Wanted: .020 Pee Wee cylinders

Post  braggs on Wed Jan 24, 2018 2:46 pm

Looking for good condition .020 pee wee cylinders. If a piston passes through it smoothly, I’ll take it!
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Wanted Re: Wanted: .020 Pee Wee cylinders

Post  Jason_WI on Mon Jan 29, 2018 6:54 pm

I can de-burr your 020 cylinder if needed under magnification. Sent me a PM.

Jason
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Wanted Re: Wanted: .020 Pee Wee cylinders

Post  ThermalSniffer on Tue Jan 30, 2018 4:27 pm

Also, despite what people say about pistons and cylinders being interchangeable, my experience says otherwise. I have a few pistons and cylinders obtained in various parts lots from eBay. I keep them loose in a parts drawer and every time I want to make an engine with them I have to first try the pistons for fit in the cylinder - some are obviously far too tight - then I have to run them because it's difficult to detect when a piston is a smidgeon small for a cylinder meaning it leaks. I am going to have to go through them soon and match them up.

I would have a go at deburring or give it to Jason to do for you since he's offered.
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Wanted Re: Wanted: .020 Pee Wee cylinders

Post  balogh on Tue Jan 30, 2018 5:28 pm

I only found otherwise interchangeable COX pistons too tight if they had a roundness issue like
having been overhammered when the balljoint was reset. Then the piston should retire for good before it kills an otherwise usable cylinder..
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Wanted Re: Wanted: .020 Pee Wee cylinders

Post  ThermalSniffer on Wed Jan 31, 2018 4:26 pm

One pattern I have discovered is that in my 020 cylinders pistons for thin wall cylinders do not fit my stepped cylinders. Another, not cylinder related, is that there is enough variance in crankshaft diameter that some will not fit certain crankcases. This applies to both 020 Tee Dee and Pee Wee. I have enough of these parts on hand now that I am pretty sure these were manufacturing changes.
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