Sequential Dog Shift

[guysh]

Can anyone tell me waht one of these type of gearboxes are really like? I can understand the advantages of them on the track (which is where it would get used most if i get one) but what would the disadvantages be on the road other than having to change down through the gears and the noise?

[GreenV8S]

Can anyone tell me waht one of these type of gearboxes are really like? I can understand the advantages of them on the track (which is where it would get used most if i get one) but what would the disadvantages be on the road other than having to change down through the gears and the noise?

I suspect there are two questions in here - sequential gearbox, and dog box. Never driven a sequential box myself (except in a cart, which doesn't really count!) but I imagine simply finding neutral could get quite tedious - something that is quite common in normal driving. Unless you have a fancy control system to find neutral for you, I think it would get annoying.

Have driven a dog box (with a standard H pattern shift) on track and it was brilliant when driven hard, but crashed and banged a lot and needed careful footwork going down the box. Driven gently it was a real pain and 'felt' horrible in that you could never tell quite when it had gone into gear. Again I think I'd soon get fed up with it on the road.

Cheers,
Peter Humphries (and a green V8S)

[pdv6]

Dunno what a "dog box" is, but I used to have a car with a dog-leg 1st gear.

No different to a 'normal' H pattern gate except that 1st is back left, 2nd is front middle etc.
R24
135

Basic idea is that you never really use 1st gear once on the move, so why force the driver to go right over to the left for 2nd?

Maybe also helps to have 2nd/3rd in line with each other when hacking 'round a track...

[GreenV8S]

pdv6 said: Dunno what a "dog box" is.

AKA "crash box", a non-syncromesh gearbox.

[pdv6]

Aha.

Short for "A right dog to drive one?"

[MDG]

Try here www.howstuffworks.com/category.htm?cat=Transm

MDG.

[guysh]

Thanks chaps,
Although I've been told you can have a Sequential box with a dog engagement - I think after reading how stuff works I can work out what it means - I assume if you have no syncromesh and have dog engagement it's a much stronger box and can cope with more power, but is more difficult to use

Guy

>> Edited by guysh on Tuesday 5th November 16:26

[mel]

GreenV8S said: Never driven a sequential box myself (except in a cart, which doesn't really count!) but I imagine simply finding neutral could get quite tedious - something that is quite common in normal driving.

I don't use neutral that much in normal driving, my guess is that it would be more like a bike, where when you stop for short periods you use the clutch, if you need neutral its simply crash down all the way then a straight forward half click up

[Simonelite501]

If its anything like the Mercedes EPS sequensial box that they use on Lorries, there is a push button which selects neutral on the control lever and one opposite that to select reverse.

[NDT]

guysh said: Thanks chaps,
Although I've been told you can have a Sequential box with a dog engagement

IIRC bike gearboxes are sequential with dog engagement aren't they?

Nick

[alfa dave]

It's when you've stepped in one pile of poop and you're turning round to find out what you've stepped in and your other foot finds another dark brown dougnut.

Edited to say Oh sorry shift

[350matt]

The big advantage of a dog box is the speed of the shift, as a normal box relies on the syncro cone braking the gear down to speed to allow it to mesh with the drive hub,this takes time. With a 'dog' box the drive dogs are just smashed together and enage almost at once, disadvantages are: pretty violent gearshift action required to make it work, hence very sudden shift and the dogs wear out faster than syncros.
And yes nearly all bikes are a dog box.

Matt