RE: Born slippy: All about limited-slip differentials

[300bhp/ton]

We need more PH articles like this!!! Fab. Maybe one on direct injection or multivalve heads next time.

Thanks PH

[blade7]

Hmmmn, judging by the drive I get out of junctions and on roundabouts the *effect* isnt gone on my 944 turbo, I fitted a LSD axle to my capri 2.8 turbo years ago, the difference it made was amazing and that diff had done a few miles too.

[kourgath]

teabagger said:

How would one go about checking the state of his viscous LSD?

For Range Rover some had viscous coupling as the centre diff locking mechanism. According to

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RRC, Workshop Manual, Section 41 Transfer Gearbox, Overhaul, Dismantle, Inspection & Overhaul.

You can either do this test on the bench or in the car with the handbrake on and one front wheel lifted.

Viscous unit - rolling resistance Bench check NOTE: Testing should be carried out in an ambient of 20 ?C.

1) Secure the output shaft ...

2) Apply a clockwise torque of 27 Nm to the (front propshaft) output flange nut. If no resistance to turn is felt, unit requires replacing.

3) If resistance to turn is felt, apply a clockwise torque of 20Nm to the (front propshaft) output flange nut for 1 minute, this should result in a rotation of approximately 25? - 30?. If no rotation or a greater force is required, unit requires replacing.

27 Nm = 20 lbf-ft 20 Nm = 15 lbf-ft

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Clearly this may be different for other VC's but it may be of help to do a basic test.

Great article, love this stuff. It also helps when teaching how diffs work for 4x4 off-road use. And that part about Audi and Land Rover...

[anonymous-user]

Thank you!

[PhillipM]

cptsideways said:

Cars came with LSD's in the 30's -- nothing new!!

We had brake steer back then too!