lots more about these gears if you want to know more.


http://www.allcars.org/manual_transmission.html

sorta shows you what a synchro does in relation to everything else. you can see the dog collar and how that works as well.

 

http://www.jackknight.co.uk/dogbox.htm

 

thats crazy so if you wanted the "reverse whine" all you would need is straight cut gears...

 

Um yeah, you don't put straight cut gears in a car just to make it whine while it's moving forward.

 

Transmissions that come in a dog box, quite obviously.

 

alot of new cars are coming with helical cut reverse gears now. people are getting very picky and didnt like the reverse whine.

and, if you were to put a straight cut gear against a helical cut gear that were made of hte exact same material against each other, the helical gear is stronger, and has much better lubrication properties. the gears in race transmissions are built out of different kinds of alloys, which are usually kept secret.

 

I think you have that backwards. Straight-cut gears are stronger. The contact load is spread out more evenly across the gear tooth.

The most famous example of this is the M21 "rock crusher" transmission from GM circa 1970. It was essentially the same transmission as the M22, which used helical-cut gears. But the M21 with its straight-cut gears handled a lot more torque.