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Doing a pair of Rumely cylinders


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Old 01-11-2019, 09:41:25 PM
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Default Doing a pair of Rumely cylinders

Boring and sleeving the cylinders from a Rumley. Not sure of the model but the bore is 8Ē.
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Old 01-11-2019, 10:51:46 PM
Bubbles Bubbles is offline
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Default Re: Doing a pair of Rumley cylinders

20-40 Model G.
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Old 01-12-2019, 09:16:08 PM
DTurner DTurner is offline
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Default Re: Doing a pair of Rumley cylinders

Whatís the clearance for that ,between the piston and cylinder?
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Old 01-13-2019, 09:41:31 PM
Mark Schneider Mark Schneider is offline
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Default Re: Doing a pair of Rumley cylinders

That's a good question...or slightly rephrased would be "What was the original piston to cylinder bore clearance that Advance Rumely gave their 2 cylinder Oilpull engines when new?"

I imagine that this clearance would be dictated by the operating temperature of the cooling system and the related components under load. Most of the "rule of thumb" clearance numbers used now are calculated assuming water as coolant. With water being used maximum cooling system temps are limited to the boiling point of water...212 degrees F. However the tractor in question uses light oil as a cooling medium without the benefit of a conventional tubular radiator so this temperature has to be hotter...and maybe much hotter?

Has anyone established just how hot the cooling oil gets in an Oilpull engine under load?

Last edited by Mark Schneider; 01-13-2019 at 11:47:24 PM.
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Old 01-13-2019, 10:40:29 PM
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Default Re: Doing a pair of Rumley cylinders

They run hot enough that any water trapped in the cooling oil will turn to steam and it will vent off like a guyser at Yellowstone! Those big pistons will heat up and expand a good bit, likely will need .008- .010 clearance?
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Old 01-13-2019, 11:19:23 PM
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Default Re: Doing a pair of Rumley cylinders

Just did mine... did 11 thousandths
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Old 01-18-2019, 09:45:34 AM
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Default Re: Doing a pair of Rumley cylinders

Iím doing them 8.000. The clearance is on the pistons.
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