OS 91 I vs II Same Power and specs?Differences/Changes
 

My old OS performance sheet shows the 91 Surpass I puts out 1.6bhp/11,000rpm.. The specs for Surpass II that I have seen are the same. Any one know for sure. What your practical experience with the two models? IS IT MORE POWERFUL?

Heres a link to tower info with info
http://www2.towerhobbies.com/cgi-bin...SY82&P=ML#tech

heres the os link
http://www.osengines.com/engines/osmg0896.html

the 2nd link makes no mention of an increase in power. After reviewing both i believe the output is equal. Bore and stroke are the same.

RE: OS 91 I vs II Same Power and specs?Differences/Changes
 

There are no power differences between the O.S. FS-91 Surpass engine and the FS091 Surpass II. There were changed to accomodate the pump system, so changes were made to keep commonality in parts.