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GENERAL => BIKE TALK => Topic started by: FloydV on October 31, 2005, 02:23:21 PM

Title: Back cut gears - what are they
Post by: FloydV on October 31, 2005, 02:23:21 PM

I have seen a reference to people using back cut gears in their transmissions. What is this and why is it helpful?

Title: Re: Back cut gears - what are they
Post by: h82bbad on October 31, 2005, 02:43:10 PM

keeps it from popping out of gear. A common problem with drag raced Busa's (and some street driven ones)

Title: Re: Back cut gears - what are they
Post by: Twisted on October 31, 2005, 03:12:42 PM

"dogs"

(http://w6rec.com/duane/bmw/trans/gear2.jpg)

input output BMW tranny, not exactly how a busa tranny is laid out but it gives you an idea how they grip, I think they notch the dogs so they grip and hold better?

(http://w6rec.com/duane/bmw/trans/gear6.jpg)

busa tranny looks more like this, constant mesh type

(http://www.gdlcycles.com/general/10transgears.jpg)

Title: Re: Back cut gears - what are they
Post by: FloydV on October 31, 2005, 03:29:42 PM

Thanks. Big difference between the two.

Title: Re: Back cut gears - what are they
Post by: Quijinn on October 31, 2005, 06:56:47 PM

Fav I took some pics of my trans when I had it apart. If you want I can post picks of the undercut dogs.

Title: Re: Back cut gears - what are they
Post by: abe67 on October 31, 2005, 08:29:54 PM

pic's please

Title: Re: Back cut gears - what are they
Post by: FloydV on November 01, 2005, 09:03:38 AM

Yeah, pics please.

Title: Re: Back cut gears - what are they
Post by: TRNorBRN6001 on November 01, 2005, 09:23:08 AM

APE has pics and explaination on cut trans. Most people cut trans so dog ears (gears) engage easier under a load. Not nescesary for clutchless shift, but aids in engagement(shift fork moves gear over to another to ramp up and lock together). Can cut the other side also so that dis-engagement is easier too. Need some trans guys on here to give a better eplaination. I think MH has some in stock for ya. :D :D :D   

Title: Re: Back cut gears - what are they
Post by: Jay on November 01, 2005, 09:19:45 PM

http://www.aperaceparts.com/transmissions.html