whats a "dog box"?
Discussion
In a normal 5 speed you have whats called a 'Double H' where the two H's share their right and left edge, the standard 5 speed with reverse in bottom right.
In a dog box you have First at the lower left position then 2nd where first usually is and 5th where 4th usually is.
I think they are designed like this for racing as first is seldom used. There is probably a more technical reason with regards to the alignment of the actual cogs but I dont know about that.
Or...that could be a dog leg box, not sure!
Matt.
>> Edited by plotloss on Tuesday 2nd April 11:58
In a dog box you have First at the lower left position then 2nd where first usually is and 5th where 4th usually is.
I think they are designed like this for racing as first is seldom used. There is probably a more technical reason with regards to the alignment of the actual cogs but I dont know about that.
Or...that could be a dog leg box, not sure!
Matt.
>> Edited by plotloss on Tuesday 2nd April 11:58
quote:My 924 Turbo had a dog-leg first, it meant I was paranoid each time I left the car in the hands of someone else (other than a Porsche dealer) because it was so easy to reverse it away from the lights! Rich...
Hmmm.. maybe you're thinking of a 'box with Dog-Leg 1st Gear??
Layout is thus:
R 2 4
1 3 5
Advantage? novelty value I expect ..
A lot (all ?) of Ferrari's have dog-leg boxes too (like my 308). Probably useful on a race track where, as mentioned, you (hopefully !) only use 1st once then use 2-5 the rest of the time. Just novelty on a road car (and slight theft prevention for idiot thieves .... it's not easy to get reverse (i.e. first to a numpty car nicker) without pushing the gear lever down first ...)
Mind you, a dog leg box does mean you occasionally forget which car you're driving, and go for an imaginary 6th where 5th is normally
Mind you, a dog leg box does mean you occasionally forget which car you're driving, and go for an imaginary 6th where 5th is normally
quote:
Hmmm.. maybe you're thinking of a 'box with Dog-Leg 1st Gear??
Layout is thus:
R 2 4
1 3 5
Advantage? novelty value I expect ..
Old VW Transporter vans used to have this layout. The main advantage from what I found was that you could scare the living be-jesus out of the people behind at traffic lights.... Did this many a time when you put it in Reverse and then move backwards once you are on green....
Managed to do it to a L driver once too - sorry if you are out there, I didnt mean it. Mind you, you should have seen their face - sheer panic....
Cheers,
Paul
quote:
Layout is thus:
R 2 4
1 3 5
Actually, a little known fact is that this layout also appears on those small tipper trucks you see on building sites. Working one summer hols on site, no one told me about the gears until I started one up, put it in (what I thought was) first and let go of the clutch. It threw all its torque into reverse, tossing me over the wheel into the (fortunately empty) bucket at the front!
Manek is nearly right.
A standard gearbox has helical cut gears (gear teeth are skewed spirally across) and synchromesh to automatically match the speed of the gears when you change up or down and avoid gear grinding.
A 'dog box' replaces the synchromesh with pairs of plates with teeth (dogs) on. It allows you to change gear more quickly, once you've mastered heel & toeing. The really skilled can do this in nano-seconds without using the clutch at all.
A 'straight cut' box uses gears with straight teeth as you can make them bigger and stronger than the helical ones for the same size gearbox, so they can take more power. Downside is they whine like you're in reverse all the time.
Most competition gearboxes have both straight cut gears and dog engagement, hence "straight cut dog box"
AdrianR
A standard gearbox has helical cut gears (gear teeth are skewed spirally across) and synchromesh to automatically match the speed of the gears when you change up or down and avoid gear grinding.
A 'dog box' replaces the synchromesh with pairs of plates with teeth (dogs) on. It allows you to change gear more quickly, once you've mastered heel & toeing. The really skilled can do this in nano-seconds without using the clutch at all.
A 'straight cut' box uses gears with straight teeth as you can make them bigger and stronger than the helical ones for the same size gearbox, so they can take more power. Downside is they whine like you're in reverse all the time.
Most competition gearboxes have both straight cut gears and dog engagement, hence "straight cut dog box"
AdrianR
quote:
Actually, a little known fact is that this layout also appears on those small tipper trucks you see on building sites. Working one summer hols on site, no one told me about the gears until I started one up, put it in (what I thought was) first and let go of the clutch. It threw all its torque into reverse, tossing me over the wheel into the (fortunately empty) bucket at the front!
Pablo - Bristol this weekend, get to the RPU. I've got the new six-speed sequential dog-box in. I'll demonstrate "look no left foot" changes
Find a straight enough, quite enough piece of road and you can have a try too.
Graeme.
________________________________________________________
graeme finlayson | tyre warmer | fluke motorsport
graeme.finlayson@vicorp.com | www.fluke-motorsport.co.uk
Barbados Rally Carnival Experience
Find a straight enough, quite enough piece of road and you can have a try too.
Graeme.
________________________________________________________
graeme finlayson | tyre warmer | fluke motorsport
graeme.finlayson@vicorp.com | www.fluke-motorsport.co.uk
Barbados Rally Carnival Experience
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