Re: 1750 differential

[Steve Moresi <smoresi@domain.elided>]

Anybody who knows better please correct me.

My understanding of the Alfa LSD is that it is a clutch type.  The 
only one of those I have ever touched worked like this...  There are 
little clutch disks that sit between the side gears and the 
differential carrier.  On the diff carrier side though there are 
little "pressure plates" that touch the clutch packs on one side, and 
have little ramps on the other side.  The little ramps on the 
"pressure plates"  meet ramps on the diff carrier.  So what all this 
means is when you step on the gas and a wheel is slipping the 
difference in speed causes the ramps to put pressure on the clutches 
locking up the differential.

The diff should then have this behavior:

coasting, (and spinning a wheel up on jacks) the diff should be 
relatively free.

driving up a gravel driveway and punching it in second gear or 
anything of the sort:  diff "locks" up and both wheels spin evenly


At least that is how mine acts.

Steve
'74 Spider
'64 Spider

At 7:41 PM -0400 9/23/02, Ed & Marsha Prytherch wrote:

> And now a question for the experts. In the Autobooks manual for 1962-1978
> Giulias, is the following - "The propeller shafts on vehicles equipped with
> limited slip differentials cannot be turned with only one wheel clear of the
> ground as with conventional differentials." It goes on to warn about driving
> the car off the jack stand if the prop shaft is forced to turn with one
> wheel on the ground. Both my 1973 GTV and my 1979 spider allow the prop
> shaft and the raised wheel to spin freely. Are my LSD differentials now
unlimited slip or is the book incorrect?
Ed Prytherch

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Steven R. Moresi

smoresi@domain.elided
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