Disc valve for intake was side mount, had a assimetrical timing on intake opening- think of Detroit Diesel with exhaust valves that are not open/close at same point in intake/exhaust cycle. Disc intake allows for a earlier opening in intake to the crankcase and closes before pulse back that would be a slight waste of intake charge as common on piston port timed intake to crankcase. Later Reed Valve has a simpler mechanism, can be fitted to basic 2 stroke of earlier pattern without making new tooling for new crankcase and provides some of variable intake timing reducing pulse back to carburetor. Rotax still has some disc valve designs I think, ATV and snowmobile with less EPA hassles but may have had to stop selling them in some places. Good idea for time, proven from MZ racers but they could have some problem with disc failure. RN
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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