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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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