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Old 03-05-2010, 07:42 AM   #1
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Default Sirio evo 4 & Orion Alpha .12engine

Hi guys, I need more information about this 2 engines therefore hope that u all can help me!

From what i know the new .12 Orion Alpha is a sirio based engine and i know that both Sirio evo 4 n Orion Alpha share the same engine bearing size.. So i would like to know do they share the same p/s, rod and crank? Thanks
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Old 03-07-2010, 06:10 AM   #2
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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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Old 03-07-2010, 05:55 PM   #3
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Quote:
Originally Posted by Maddin21 View Post
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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can i fit a orion alpha PS set into a sirio STI4?
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Old 03-08-2010, 02:06 AM   #4
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Quote:
Originally Posted by NitroWD View Post
can i fit a orion alpha PS set into a sirio STI4?
Did you actually read what he posted?
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Old 03-08-2010, 02:24 AM   #5
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Quote:
Originally Posted by stefan View Post
Did you actually read what he posted?
ya i know, he stated a shorter liner; so maybe we could adjust with shims?

sorry i'm not too versed in engines.
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