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Old 03-05-2012, 04:28 PM
markscogg markscogg is offline
Join Date: Mar 2005
Location: Charlotte, NC
Posts: 303
Default Compression check on Rotax 912 ?

How do you check the compression on a Rotax 912?
Differential check just like a lycoming or continental?
Or PSI check like a car?
I have heard both.
Mark Scoggins
Charlotte, NC
RV-6 bought,flown and sold.
Rv-4 bought, flown and sold.
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Old 03-20-2012, 04:10 PM
Tracer 10 Tracer 10 is offline
Join Date: Mar 2011
Location: Oregon
Posts: 79
Talking Rotax 912 Compression Test

I used a differential compression tester; the same as used on the Lycoming/Continental Engines.
Just be darn careful that you have the piston on top dead center of the compression stroke and a qualified/experienced person holding the prop; before applying air pressure to the cylinder being tested.
I also highly recommend balancing the carburetors with a manometer; you won't believe the difference in how well that engine can run with balanced carb's. As far as i am concerned--the Rotax engine is a well proven and excellent engine.
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