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Cox Engine of The Month
December-2024
roddie's

".049 reed-valve marine conversion"

More info on this engine!




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Post  JPvelo Sat Nov 17, 2012 2:59 pm

What's the best way to determine the age of an Ok Cub?
Jim
https://i.imgur.com/8W3ug.jpg
https://i.imgur.com/wArb0.jpg
https://i.imgur.com/gsKXV.jpg
https://i.imgur.com/3VUnp.jpg
https://i.imgur.com/nmzWe.jpg
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Post  dckrsn Sat Nov 17, 2012 3:11 pm

Jim, I seem to remember the .049b with the serial numbers
were exclusive to 1953. Note:seem to remember.
Here's mine with the 128tpi needle assembly retrofit.
Bob
Ok cub manufacture date 00324
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Post  dckrsn Sat Nov 17, 2012 3:35 pm

On closer inspection, those are patent numbers
on the underside of the engine.
Mine has the same number as yours.
Bob
Ok cub manufacture date Cub_0411


Last edited by dckrsn on Sat Nov 17, 2012 3:53 pm; edited 1 time in total
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Post  SuperDave Sat Nov 17, 2012 3:50 pm

Mark Boeson is the CECF "resident authority" on Cox engines.

Perhaps Mark will "drop in" and tell us how to determine the manufacture dates (as opposed to age) Wink
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Post  dckrsn Sat Nov 17, 2012 5:43 pm

Jim,
'Til Mark checks in, here's this from his site.
I believe this is the one.
Bob
http://groups.yahoo.com/group/049Collectors/photos/album/408072958/pic/631152468/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
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Post  Mark Boesen Sat Nov 17, 2012 10:31 pm

Jeez, I wish! Mud is the king of the Thimble Drome world! I've been collecting Cox stuff for twenty years or so, but it’s a drop in the bucket compared to Mud.

As far as Herkimer stuff goes, unlike Thimble-Drome I don't think anybody really bothered to take a lot of notes 'back in the day' or likely save any info. I've emailed Ted Brebeck several times (founders grandson) and he's a nice guy, but he doesn't really have much for detailed info. What info that’s been published in ECJ is pretty basic as well.

The original 'large case' .049/.074 with serial numbers only lasted a year or so, less then two and were pretty much done by '50, early '51. Your .049B came out in 1953 and was in production up into the late 50'S. I noticed it does have the larger diameter knob on the needle, which seemed common up to '56-'57(?), so about the best I can say it’s a 'mid-fifties' .049B :^(...

http://groups.yahoo.com/group/049Collectors/photos/album/408072958/pic/list
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Post  JPvelo Sat Nov 17, 2012 11:09 pm

Thank you!
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Post  gcb Sun Nov 18, 2012 9:59 pm

One you don't see often is the .049C. It was made by adding an .049A tank with an .049B engine via a dural plate. These were assembled from factory parts but not while OK was in production. It's in the upper left of this pic.

George

Ok cub manufacture date Ok049s10
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Post  dckrsn Sun Nov 18, 2012 10:14 pm

Very cool George. Never seen or even heard of the "C".
A+B=C The nuns were right!
Thanks,
Bob
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