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Robert W. Yost                     Dayton,  IN                  rwy42@Frontier.com                          9/30/2010

Offy 270
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.

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I ordered the book from Ron-Building the 1/4  Scale 270 Offy.

 

The complete 1/4 scale Offy

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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.

                                                                                                                                                       

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I ordered the material for the 1/4 scale Offy.

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Machining the crankcase  

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Showing the crankcase and cylinders

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Pistons and rings

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Milling the side panels

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Engine with side panels

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Ready for gear tower

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Machining the gear tower

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Cutting gears

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Cutting a valve

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Gear tower installed

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Showing a bearing, piston and a valve

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Making the exhaust

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