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Author Topic: OK B-C class engine with ball/socket rod?  (Read 1182 times)

Offline Terry Caron

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OK B-C class engine with ball/socket rod?
« on: March 17, 2015, 02:51:07 PM »
Am I correct in thinking some of the old OK .29 or .35 had a ball and socket rod/piston assy?

Thanks.

Terry
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Offline Robert Zambelli

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Re: OK B-C class engine with ball/socket rod?
« Reply #1 on: March 17, 2015, 03:28:24 PM »
Hi, Terry.
Every OK engine I've owned had a standard wrist pin piston assembly.
Bob Z.
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Offline Terry Caron

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Re: OK B-C class engine with ball/socket rod?
« Reply #2 on: March 17, 2015, 04:12:01 PM »
Here's a pic of it - any idea what it's for?

Terry
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Offline Tim Wescott

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Re: OK B-C class engine with ball/socket rod?
« Reply #3 on: March 17, 2015, 04:41:04 PM »
I know that there were a few engines in that size class that used a ball & socket "wrist joint".  To the extent of my scant knowledge, this technique enjoyed a short surge of popularity right after WW-II.  There's no way I could even guess what engine your con rod might go to, however.
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Offline Terry Caron

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Re: OK B-C class engine with ball/socket rod?
« Reply #4 on: March 18, 2015, 09:45:15 AM »
Possibly Mohawk?
I know nothing about them other than that they exist, but I think were also an early Herkimer product.

Terry
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Offline Andrew Hathaway

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Re: OK B-C class engine with ball/socket rod?
« Reply #5 on: March 18, 2015, 10:19:15 AM »
The Mohawk .29 is just the early OK .29 with some cosmetic changes to the case, and no main bearing.  The rod is/was a typical piece with a normal wrist pin.

That's not a Mohawk part.
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Offline Terry Caron

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Re: OK B-C class engine with ball/socket rod?
« Reply #6 on: March 18, 2015, 10:36:00 AM »
Well, rats!
I'm sure someone could use this, if I could find out what it's for.
Just in case:
OAL 1.722"
Crankpin ID .218"
    "       width .214"
Ball diam .209"

Terry

P.S. - just found that I also have 2 unfinished .29 Mohawk con rod rough castings, typical as you said Andrew, PM if anyone could use one.
And a finished .29 Cub rod.
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Offline Andrew Hathaway

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Re: OK B-C class engine with ball/socket rod?
« Reply #7 on: March 18, 2015, 01:15:34 PM »
I could use the Mohawk 29 rods.  OK's idea of finishing the rod is to cut 90% of the way through the crank pin hole with a hacksaw for lubrication.  I think I've got about a dozen OK and Mohawk 29s, but I'm short a few rods since they like to crack at the saw cut.  I've been meaning to order a few of the castings from OK, but I'm pretty sure the last catalog I received from them was dated 2011.   n~ 
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