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Author Topic: Slipping gearbox/clutch  (Read 2459 times)

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Andy B

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Re: Slipping gearbox/clutch
« Reply #15 on: 06 May 2007, 16:53:04 »

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..... and there were no tell tale twin black tyre streaks on the road ......

LSD then?

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TheBoy

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Re: Slipping gearbox/clutch
« Reply #16 on: 06 May 2007, 16:58:19 »

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Quote
..... and there were no tell tale twin black tyre streaks on the road ......

LSD then?

It is possible to get 2 blackies without an LSD. Apparently  ::)
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Andy B

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Re: Slipping gearbox/clutch
« Reply #17 on: 06 May 2007, 18:18:38 »

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Quote
Quote
..... and there were no tell tale twin black tyre streaks on the road ......

LSD then?

It is possible to get 2 blackies without an LSD. Apparently  ::)

Oh! ;D
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TheBoy

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Re: Slipping gearbox/clutch
« Reply #18 on: 06 May 2007, 21:12:50 »

Quote
Quote
Quote
Quote
..... and there were no tell tale twin black tyre streaks on the road ......

LSD then?

It is possible to get 2 blackies without an LSD. Apparently  ::)

Oh! ;D
Harder with FWD, as the front tends to bounce a bit whilst doing it. Again, apparently....
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Martin_1962

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Re: Slipping gearbox/clutch
« Reply #19 on: 07 May 2007, 09:41:31 »

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 I had to be swift as the wazzock at fault and causing the sudden movement by me was thundering hard towards my rear at the time.  Good job I had an eye on the rear mirror....

THat is interesting - I would guess than 90% of drivers would have been rear ended. :y
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Kevin Wood

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Re: Slipping gearbox/clutch
« Reply #20 on: 08 May 2007, 11:10:33 »

It is possible to get a clutch slipping by a very aggressive start when otherwise it will handle the full torque of the engine with no problems. Take the scenario that you accelerate to the limiter in 1st gear and then quickly snatch second. The engine may be up at 6500 RPM and there is a serious amount of energy stored in the rotation of the flywheel and crankshaft.

In second the revs may drop to say 5000 RPM (not sure how big a jump there is between 1st and 2nd on a manual Omega). If you are quick you'll have grabbed second and released the clutch before the engine has slowed significantly. The difference in speed between the clutch plates is 1500 RPM. That can't disappear immediately due to the huge energy that needs to be dissipated to slow the flywheel. It must be dissipated by one of the two friction surfaces in the system - between the tyres and the ground or betweeen the clutch plates. If traction was good, maybe the clutch plates started slipping in this instance. It's a toss up between how much torque either friction surface can handle.

My experience is that once a clutch slips a little in this instance, it will continue to slip under engine torque for a second or two before biting, maybe because of heat buildup on the friction material.

Kevin
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hotel21

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Re: Slipping gearbox/clutch
« Reply #21 on: 08 May 2007, 12:18:52 »

Thanks for that, Kevin.  Your comments are in line with my thoughts.  I think I simply got the power/clutch thing a bit out of sync, such that the revs overtook the bite of the clutch - it was a really rapid dump and go!  The very hurried and snatched change to second probably had the same adrenaline input as the launch, hence the continued slipping.  All was good afterwards, though.

cheers.   :y  
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