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#11
11-10-2008, 07:15 AM
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Re: M22 transmissions
One of the problems with the standard muncie gear angle is that it places a large thrust load on the front input bearing and retainer, causing cracked cases and thread stripping around the bolt holes when launching at high RPM on slicks. The torque also tries to seperate the gears based on helix and tooth pressure angle causing the countershaft to flex. Some of the transmissions designed for racing have a center support near the middle of the countershaft and mainshaft to control the deflection. Straight cut gears with a 14 1/2 degree pressure angle would work well, and would not create power robbing thrust friction forces. I think the Jerico boxes used in NASCAR are similar with dog style synchro engagement. These would make a nice transmission for really fast shifts if the rules permitted.
Paul
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