Compression Test on PT-422

[Frank Sorbello]

I checked the compression on my PT-422 22hp Robin. On the left side I got 135psi. On the right side I got 145 psi. I couldn't find the specs for the compression on Robin's website. Does anyone know or have any information on where the compression for this engine should be?

Thanks
Frank

 

[BobRip]

I have the service manual, but could not find a value. The compression ration is 8.3. When I multiple 8.3 x 14.7 I get 122. Your numbers are close enough to each other that I doubt there is a problem.

 

[Frank Sorbello]

Thanks Bob