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Ohlsson & Rice: Odd Piston & Rod

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Anyone know what type of O&R engine uses these large, beefy pistons and connecting rods? I’ve never opened up a 20A, is that what this is for?

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I don't think that is anything to do with O&R engines, the Series 20A has a one piece crankshaft, no chance of fitting that. Did it come with some O&R spares?

 

I thought I had uploaded the 20A manual. :poke:

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David

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Thanks David. I just didn’t have time to look through the 20A manual last night.  I did get it with some other O&R parts.  Maybe it’s for a small Tecumseh or something. I’ll be sure to purge it from my O&R spares...

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Maybe if you add some dimensions and we could move this to the "What is it?" section, someone might recognise it.

 

O&R stopped using alloy con-rods in the model engines that pre-date the Compact engine, the alloy con-rods couldn't handle the modern glow fuels of the era, the replacement steel con-rods wouldn't bend and the worse case scenario was the cylinder getting blown off instead, or the crankcase splitting.

 

David

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