Dog Box? Anyone done it / running one?

[jezza323]

a straight cut gear with teeth of the same width and height as a helical gear will not be as strong

pls google this topic for more information....preferrably find some where with the correct information

[Mr_will]

yep, sick of telling people to google stuff, so i do it myself

[Mr_will]

a straight cut gear with teeth of the same width and height as a helical gear will not be as strong

pls google this topic for more information....preferrably find some where with the correct information

noone said they would be.

much of the strength of a straight cut box comes from the fact that you use bigger teeth, so your point is kinda stupid

additionally, you'll never achieve the same shift speeds with a synchro box as with a dog box.

and you CAN have helical cut dogboxes, if you think that is the best of both worlds for your application

[Paul1985]

I reckon the whine sounds cool. Probably would get tired of the sound quick though..

Think of going flat out in reverse, thats what it would sound like.

[jezza323]

do your research, main reason for straight cut gears is that they are about 100 times easier and cheaper to cut

[Mr_will]

do your research, main reason for straight cut gears is that they are about 100 times easier and cheaper to cut

ummmmmmm then why are they used on high budget drag and track cars?

because they allow quicker shifting, without the clutch, thats why.

they also take up less room

[jezza323]

because they replace them frequently

[Mr_will]

because they replace them frequently

most of those teams could afford to replace helical gears frequently too.

so do you have any argument for the fact that dog boxes allow for much quicker changes, without the clutch? doesnt sound like you do...

[jezza323]

they actually take up more room, because they have to be wider, so that you can have something as strong as a narrower helical cut gear

also....you cant just make bigger teeth, as you wouldnt be able to fit as many teeth on each gear, therefore changing the gear ratio significantly

[jezza323]

yes a dog box allows quicker shifting, not disputing that at all

EDIT - just trying to point out incorrect information being passed to someone who does not know much about it. also trying to make sure ppl understand a dog box + a street car is not a good mix

[Mr_will]

they actually take up more room, because they have to be wider, so that you can have something as strong as a narrower helical cut gear

also....you cant just make bigger teeth, as you wouldnt be able to fit as many teeth on each gear, therefore changing the gear ratio significantly

you have misunderstood - the teeth are WIDER because the dog mechanism is smaller than a syncro, so for any given amount of space, the gear can be longer in a dog box setup.


any arguments for the idea of the extra end thrust created by helical gears? or the fact that they are less efficient as far as torque transmission?

[jezza323]

any arguments for the idea that dog rings wear much faster than a synchro?

im not saying they are not good for certain applications, my guess is no one on this forum (unless the IPRA guys are on here) has an application to suit a dogbox