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#1
04-03-2011, 09:23 PM
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External Oil Cooler System
When I pulled apart the K241 on my 100, I noticed that there is a lot of open space in the bottom of the motor, which I assume is part of the design. Given that we're running air-cooled motors in a slow-speed application, would it be beneficial to add a external oil cooler to the motors? I'm not saying make it a full-on pressurized system that modern machines & vehicles have, but something low pressure, nothing more than a little circulation pump, that moves the engine oil thru the cooler and then back into the pan in a continous loop. My general thinking is that keeping the oil temp down along with the added capacity of the system would add longevity to the motor itself. Being that most of us are doing rebuilds anyways, maybe its not a bad idea to make that work & effort last longer. The picture I attached is of the oil cooler on my Honda sport quad, which would be a good size to fit my 100's grill.
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Mike  - Ramsey, MN'65 100 - #126432 Options: V61's, 8.5" Tru-Powers, stock sleeve hitch, Xtreme sleeve hitch adapter Attachments: Dad's 42" Dozer Blade & 38" 3-spindle deck, 42U deck, Homemade Sleeve Hitch Dethatcher & a QA36A Snowthrower Mods: K301 Upgrade, IHinIN's clutch pivot upgrade, SST driveshaft, custom bar axles "Why buy something shiny & new when you can save something old." 
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#2
04-18-2011, 08:53 PM
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You'd have to drill (and tap) 2 holes in the block, one in the bottom for a feed, and I'd do one on the side for a return. You'd need a solution for airflow to the cooler as well, some small 12v fans. THen make sure that your charging system is up to the task. Lots of stuff, but do-able!
I'm not sure if an oil cooler is really necessary though, especially with synthetic lubricants that can take higher temperatures seen by our hardworking engines (especially if they're lugged). I do know that some Kohler command v-twin engines have an oil cooler (the 23hp unit on dad's Simplicity Prestige has one) that's mounted in a hole in the shroud so it sees some airflow. That's pressure lubed, so an oil cooler would be a lot easier to add to an engine with that feature.
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CC 128 (Sept. 74)... and other vintage non-CC LT/GTs.
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