pic: 2 speed tranny

[kramarczyk]

Originally Posted by Hachiban VIII

...a crash shifting transmission looks simpler to build than a dog-shifting one. I wonder why more teams don't do it. Why did you choose crash-shifting over dog shifting?

Can somebody clarify the differences between crash shifting and dog shifting for those of us in the peanut gallery?

[lukevanoort]

Crash shifting (also sometimes referred to as blind shifters, 116-style shifters, sliding gear shifters, and gear munchers) is when you have gears slide to engage a different set of gears like so:



Dog shifting (also sometimes referred to as 45-style or 716-style shifters, depending on the dog design) engages a set of gears by using a 'dog' to lock to the shaft one of a pair of freewheeling gears. Like so:

The orange part is the dog, green and blue are the freewheeling gears, red part is the output shaft, and the yellow part is the shifting rod that actuates the sliding action of the dog. (The shifter appears to be in the middle of shifting and the dog isn't really engaging either of the gears)

[Kevin Sevcik]

While that piston orientation save a ton of space, it looks like a royal pain to install and maintain. Is there a good reason not to just turn your two clearance holes into notches so the piston can be removed with the pneumatic fittings still in place?

Very nice! Not sure what all the complaints are about, this looks like a very solid design! 3.2 pounds is amazingly light for a 2 speed shifter. I believe the only thing lighter was the 254/968 gearbox, but that thing was just insane.

Looks very, very nice. What made you go with crash shifting, instead of dog shifting, or a ball lock alternative?