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Older Thin Wall TD .049 Cox_ba12




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Cox Engine of The Month
September-2023
balogh's

"Beefed up old stock 290 on my Quickie100 RC after plenty of airtime hours..."

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Older Thin Wall TD .049

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Post  anm2 Sun Mar 23, 2014 3:00 pm

I picked this engine up at an estate sale yesterday.  It was frozen, and had 50 years of dust and fuel residue on it when I got it.  Also, the carburator was washed out and had a split in it.  Came home and cleaned it out (not refurbished).  It turned out to be a very nice example with excellent compression.  Some interesting things I found.  It has an unmarked #4 cylinder.  The Gold anodizing looks like a rose color similar to the older Golden Bees.  The crankshaft was purple in color across the back web and the front.  Overall a really nice early model TD.  Andy
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Post  Ken Cook Sun Mar 23, 2014 6:17 pm

Andy, does the conrod have a oil hole in the bottom of it? I have 2 very similar to this one. I found them to be terrific runners. Ken
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Post  anm2 Sun Mar 23, 2014 6:44 pm

Ken Cook wrote:          Andy, does the conrod have a oil hole in the bottom of it? I have 2 very similar to this one. I found them to be terrific runners. Ken

Ken,

Yes, it does. I noticed the hole in the bottom of the conrod when I was putting it back together. I meant to mention that too. I vaguely recall a conversation about it on the forum but didn't remember why it was there. I am guessing this is from the first year the engine came out, only because it is before they started numbering the cylinders. Either that, or they made a mistake, but I am guessing this is an early run engine. The deep purple hue of the crankshaft really caught my eye. Andy
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Post  Cribbs74 Sun Mar 23, 2014 7:36 pm

I have an .051 that is identical. Mine has a 5 on the cylinder though.

The purple hue on your crank puzzles me. Are you sure it just didn't get really hot at one time?

Ron
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Post  Mark Boesen Sun Mar 23, 2014 8:24 pm

That's likely what happened, as the anodizing is faded. When anodized aluminum gets hot over a period of time the colors can fade. None the less its still a pretty nice early Tee Dee.

I can't remember for sure, but I think the new crank/case number came out in the early seventies?
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