Just a little back ground on this subject. In 1969 OMC introduced a 437 cc opposed cylinder snowmobile engine rated 25 HP. Now we all know (some of us anyway) that both Evinrude and Johnson have built 4 cylinder opposed engines in the past. Sooooooooo, Snowmobile engineering was asked to put two 25 hp together and see about a possible production 50 hp+ sled. Ok, now we have a 874 cc 54 hp prototype is fan cooled engine, and the next question is how does this compare to our competition? But we have no competition, there are no snowmobile 4 cylinder engines. Enter Konig with a claimed HP of 90 HP @8000 RPM.
The following test was run at OMC Resarch in Milwaukee on 11/11/69 by James Danahue.
Konig VC rotary valve 4 cylinder opposed water cooled racing outboard motor. Bore 2.11 in./ 53.5 cm, stroke 2.13 in/54 cm, displacement 29.64 cu/in, 492 ccm.
Port timing - exhaust port opens at 88.5 degrees atdc, back port opens 107.5 degrees atdc and transfer port opens 114.5 degrees atdc. Rotary valve starts opening 126 degrees btdc, full open 75.5 degrees btdc, starts to close 6 degrees atdc, full close 59 degrees atdc.
Now the big one, - 82.5 CBHP @8500 RPM with stock Konig mufflers, no expansion chambers.
Bookmarks