Lotus Elan

LSD ???

PostPost by: l10tus » Wed Apr 18, 2018 11:39 am

bd37011f-1432-4e8e-a4de-bfa3646f74e6.jpg and
f131d133-0fd1-4863-90ee-80531bd43f4b.jpg and
ea2b045e-16c1-417e-974f-aef80c67fe87.jpg and
ea2b045e-16c1-417e-974f-aef80c67fe87.jpg and
Upon stripping this ex. Racing diff (USA) it seems to be a basic LSD type - can anyone identify which make it is, or any info on its operation? The inner unit appears to be a cam design operation type, which I'm not familiar with.

Thinking about its operation, it would seem to suggest it to be either engaged or not, so I need to understand it's operation & worth??

Any help would be appreciated,

Ta!
Philip.

UK '72 Sprint DHC

Sometimes my Lotus makes me cry.
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PostPost by: promotor » Wed Apr 18, 2018 3:44 pm

That's known as a "cam and pawl" LSD. Not sure on maker but it's not a very common design for English diffs. I seem to remember looking around for spares for one previously and finding a dead-end.

As you say it is more like a switch in the way that it operates ie either on or off, no in between. Other than that I can't really add anything of value!
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PostPost by: everettmse » Wed Apr 18, 2018 6:38 pm

If I am correct it may be an early Hewland type. It should have balls or small chicklet type elements that engage the two key large parts. It works on centrifugal force as the balls will engage. I don't believe them to be as smooth as a Salisbury or Plate Type LSD.

Alpine Renault A110's used these for their rally and competition transaxles and you can still find them available so they are not completely obsolete, if you don't consider the A110's obsolete. I know who we are all talking about dealing with our 40 plus year old cars.

Of course everything needs to be clean so the parts can work freely inside the diff case. The one picture does look like it has the balls that engage everything. I think there should be a ball for every detent.

I have one in an old Elan Diff not installed in a car if it needs to be clarified further, I would be happy to do that.
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PostPost by: l10tus » Fri Apr 20, 2018 9:24 am

Gents,

Thanks for the replies, seems there's consensus the it would be 'all-in or all-out'

So probably not a good idea to use on a road car, me thinks?

Ta!
Philip.

UK '72 Sprint DHC

Sometimes my Lotus makes me cry.
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