mads
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| posted on 5/4/10 at 12:10 PM |
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what is a 'locked' diff?
can anyone explain what it means when a diff has been 'locked'? can it be un-locked?
We gain knowledge faster than we do wisdom!
Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in
sideways, thoroughly used, totally worn out and loudly proclaiming... "f*ck, what a trip!"
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CRAIGR
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| posted on 5/4/10 at 12:14 PM |
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Normally a diff thats had the planet gears welded up so that both wheels will only turn at the same speed. Lots of tyre scrubbing on cornering or
plenty sideways.
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prawnabie
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| posted on 5/4/10 at 12:14 PM |
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This reminds me of the thread on another forum with the guy that welded his crownwheel and pinion up!
Locking a diff usually entails either welding , or pinning the planet gears inside the diff so that there is no speed difference between the two
driven wheels. Ok if you need to drive straight, but or and corner you will either lose control, rip the tyres to shreds or break whatever link you
have from the diff to the wheels.
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prawnabie
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| posted on 5/4/10 at 12:14 PM |
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This reminds me of the thread on another forum with the guy that welded his crownwheel and pinion up!
Locking a diff usually entails either welding , or pinning the planet gears inside the diff so that there is no speed difference between the two
driven wheels. Ok if you need to drive straight, but or and corner you will either lose control, rip the tyres to shreds or break whatever link you
have from the diff to the wheels.
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Liam
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| posted on 5/4/10 at 12:18 PM |
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You might also see diffs referred to as 'lockable' - mostly in off-roaders. They are essentially an on/off LSD - either fully open or
fully locked with a manual control in the car. Of course this type of diff can be unlocked as well as locked!
Liam
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speedyxjs
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| posted on 5/4/10 at 12:25 PM |
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Normally only used for drag racing and drifting. Be carful if welding it yourself though as if the weld breaks, its bye bye diff! 
How long can i resist the temptation to drop a V8 in?
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omega0684
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| posted on 5/4/10 at 12:42 PM |
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its when you fill the diff with lock tight and not diff oil 
I love Pinto's, even if i did get mine from P&O!
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hillbillyracer
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| posted on 5/4/10 at 12:44 PM |
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Welded diffs are used in Autograss quite a bit, I did mine on a front wheel drive & it made the car more predictable than a plate LSD but you did
have to be a bit rough with it to get it to turn into the corners. Once turned in though it was fine.
The only real trouble was you had to be careful when moving about in the pits etc, it was quite easy to pop an outer CV if you wer'nt careful
but it was never a problem when you were thrashing it!
& if you do weld it up have the halfshafts/driveshaft stubs in while you tack it up as they'll likely be out of line otherwise.
I've heard of them being filled with lead too to do the same thing.
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Canada EH!
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| posted on 5/4/10 at 05:36 PM |
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Locked or welded diffs have been used in circle track racing, early days of NASCAR.
I believe they now use a Spool, which is similar to the spider gear carrier. The crown wheel is bolted to the spool and the axles slide into the
splines in the spool, no spider gears, therefore no differentil gearing.
The 105E Anglia and Datsun 1200 I raced in the 60's and 70's had welded spider gears, no problems on the track, just as stated in the
pits, hard to steer.
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delboy
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| posted on 5/4/10 at 06:06 PM |
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As above really, they are welded up. I'm assuming you've seen the 3,38 7" sierra diff on ebay . It wont be much use in a kit car
unless you want to try racing it on the ovals.
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Volvorsport
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| posted on 5/4/10 at 06:15 PM |
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some diffs can also be described as locking , ie when the stop the inside wheel spinning , they lock up 100% and usually result in opposite lock and
lots of swearing if it catches you out .
search on ebay for a detroit locker
www.dbsmotorsport.co.uk
getting dirty under a bus
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