R/C Tech Forums - Sirio evo 4 & Orion Alpha .12engine

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jameslow

03-05-2010 06:42 AM

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 :sweat:

Maddin21

03-07-2010 05:10 AM

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...

--- MARTIN ---

NitroWD

03-07-2010 04:55 PM

Quote:

Originally Posted by Maddin21 (Post 7101553)

can i fit a orion alpha PS set into a sirio STI4?

stefan

03-08-2010 01:06 AM

Quote:

Originally Posted by NitroWD (Post 7103777)

can i fit a orion alpha PS set into a sirio STI4?

Did you actually read what he posted?

NitroWD

03-08-2010 01:24 AM

Quote:

Originally Posted by stefan (Post 7105607)

Did you actually read what he posted?

ya i know, he stated a shorter liner; so maybe we could adjust with shims? :confused:

sorry i'm not too versed in engines. ;)

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