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Thread: Sirio evo 4 & Orion Alpha .12engine
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Old 03-07-2010 | 05:10 AM
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Maddin21
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Joined: Oct 2005
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From: Germany
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The Orion Alpha .12 are based on or actually are Sirio XXX engines.
The Evo 4 had a different bore and stroke...and the well known sleeve layout.
The XXX engines have a much shorter liner where the TDC is the top of the sleeve.
So both...p/s sets and combustion chamber are different between both engines.
Same for the crankshaft...

Conrod and bearings are interchangeable...


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