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Ron Colonna 1/4 Scale Offy

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Art K:
Mike,
Ron's Offy is on my list of engines to build. This video is from 2012 NAMES.
http://www.youtube.com/watch?v=OXKV7ez2wEg
Ron used every book and detail he could find to make it as close to "as designed as possible" and still be possible to install all the internal bearing webs. I have the CAD over 90 percent complete but am not convinced that is the way I want to build it. I like Terry Mayhugh's split case, if you haven't read his build article on HMEM it's worth a look before you get to far along in the design process.
Art

Mayhugh1:

--- Quote from: uuu on March 14, 2025, 10:02:04 AM ---I'm interested to see the split block in the link uses bearing caps on the lower section.  I wonder if you could dispense with these and have the upper part of the bearing as part of the upper block - rather like Japanese motorcycles?

Wilf

--- End quote ---
You could certainly make the upper half of the crankcase also be the upper half of the main bearings, but scraping them in becomes a hassle. - Terry

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