ORIGINAL: DarZeelon
Ed Moorman and Hugh,
Since the ASP is a clone of the OS; and since you discuss the ASP being at its best between 8K and 9K RPM, is the OS1.08FSR also at its best in this range???
I seem to remember it being good for much higher RPM and it's rated by its manufacturer at no less than 16K...
Please explain.
I think the ASP 108is more of a clone of the OS .91 FSR
http://www.osengines.com/history/osm...-max-91fsr.jpg
I have been told that the 1.08 has smaller passages than the OS 1.08 and does not breath as well, thus the slower revs than the ASP .91. But Ihave never compared them side by side. I stated that the ASP and Magnum 1.08 should rev at or slightly above 9 K not 8K. But come to think there are several versions and the timing may different for each. I think there is the ASP red head, the later grey head, the Magnum 108, 108A, and possiby a 108B. There may be differances in the best prop and revs for some of these versions.