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Robert W. Yost Dayton, IN rwy42@Frontier.com 9/30/2010
Inline 4 cylinder, 4 cycle, design by Ron Colonna
Machining the Scale Offy
In 2000 I saw on the front page of Strictly I.C. a picture of Ron Colonna’s 1/4 scale 270 Offy.
I ordered the book from Ron-Building the 1/4 Scale 270 Offy.
The complete 1/4 scale Offy
This engine was completed in December of 2003
I saw Ron at the N.A.M.E.S. Show in Wyandotte, Michigan in April of 2001. I saw the engine and heard it run. I then decided to attempt to machine the engine.
I ordered the material for the 1/4 scale Offy.
Machining the crankcase
Showing the crankcase and cylinders
Pistons and rings
Milling the side panels
Engine with side panels
Ready for gear tower
Machining the gear tower
Cutting a valve
Gear tower installed
Showing a bearing, piston and a valve
Making the exhaust
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