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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS .91SZ vs. Align .91H Internal Specs Comparison
03-08-2012 04:53 PM  6 years agoPost 1
breedatrad

rrApprentice

NW PA

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Hi All;

Is there a thread that compares these two engines' specs like bore, stroke, intake timing, cylinder port timing, combustion chamber shape, squish, etc?

I'd like to see what all Align changed to make this engine their own.

Brian

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03-08-2012 05:09 PM  6 years agoPost 2
Mike Fortin

rrElite Veteran

USA

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Align doesn't make the engine, the engine is produced by OS for Align.

They are identical and you can interchange and swap parts between the two.

Have Rotors, Will Fly!

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03-08-2012 06:36 PM  6 years agoPost 3
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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The OS HZ and Align H is the same not the OS SZ.
The OS SZ is a different older engine with different internals. Think if I remember right the ring and the rod is the same the rest is different internally from the later newer now widely used OS and Align branded HZ engines.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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