smiffyraf1
New member
hi guys mines started making a clunking on initial application of throttle and lift off, more like one clunk and a jolt, like getting bumped from behind, any ideas?? 
clunky acceleration and lift off
- Thread starter smiffyraf1
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smiffyraf1
New member
excuse ignorance but whats a cush?! lol does this mean im looking at a new clutch
peanut
Active member
Don't worry Baz is an expoit at middle earth spek
the centre of original clutch plates is made of rubber like a CV joint if you like. It cushions the transmission take up on acceleration and de-acceleration.
Once the rubber starts to deteriorate the connection between the engine and your transmission gets sloppy and eventually the rubber breaks up leaving small metal clips to take up the strain. These are a 'limp home device ' and eventually these will give up and you'll be stranded in the middle of nowhere in a blizzard at night with no drive. (ask me how I know [])
Suggest you drive with eggshells under your right foot and book the car for a checkup /new clutch
the centre of original clutch plates is made of rubber like a CV joint if you like. It cushions the transmission take up on acceleration and de-acceleration.
Once the rubber starts to deteriorate the connection between the engine and your transmission gets sloppy and eventually the rubber breaks up leaving small metal clips to take up the strain. These are a 'limp home device ' and eventually these will give up and you'll be stranded in the middle of nowhere in a blizzard at night with no drive. (ask me how I know [
])Suggest you drive with eggshells under your right foot and book the car for a checkup /new clutch
smiffyraf1
New member
sh*thouse! was hoping just needed a good bleeding or something! wheres the best place to purchase said clutch from, cheapest i can find is £500
JamesBall
Member
If these symptoms happen with the clutch engaged ie happen when applying and lifting off the throttle but not touching the clutch, how can the clutch be responsible? Surely these symptoms imply the clutch "cush" has gone if they happen when engaging and dis-engaging the clutch?
Or am I just exposing my lack of mechanical knowledge?
Or am I just exposing my lack of mechanical knowledge?
Clutch centre (normally done with springs, hence called a 'cush drive', but done with a lump of rubber on 944's) experiences force when applying drive in either direction - i.e. when pushing the throttle or when moving onto the over-run. Hence will clunk on both scenarios.
Before you go hugger-mugger on changing it tho, have a look in the inspection port on the side of the bellhousing, and see whether there are any other signs of problems. Lumps of rubber hanging around are a bad sign. Also look for other causes - is there anything loose in the suspension? Anything broken? Anything else amiss?
Changing the clutch is a big, but easy, job. The parts are expensive, as has been noted. Do you have any history as to when it was last changed (if at all)?
Oli.
Before you go hugger-mugger on changing it tho, have a look in the inspection port on the side of the bellhousing, and see whether there are any other signs of problems. Lumps of rubber hanging around are a bad sign. Also look for other causes - is there anything loose in the suspension? Anything broken? Anything else amiss?
Changing the clutch is a big, but easy, job. The parts are expensive, as has been noted. Do you have any history as to when it was last changed (if at all)?
Oli.
smiffyraf1
New member
have found a second hand one with 5k on it for 170, is it worth it or should i bite the bullet and buy a spanker?
In no way would I consider fitting a second-hand clutch. Particularly not to a 944; the amount of work involved in getting to the clutch to replace it would mean that it's worth fitting the best clutch you possibly can find, and only doing the job once. Saving a couple of hundred on the part would be a complete false economy.
Cheapest place for the clutch I found was Max Schenker at Frazer Part. Great service from them too.
Oli.
Cheapest place for the clutch I found was Max Schenker at Frazer Part. Great service from them too.
Oli.
peanut
Active member
you need to think about how the rubber centre clutch works or better still look at a picture of one. The whole object of the ndesign is to allow some cushioning in the drive so it works when you are driving ie with the clutch plate engaged
Its similar to what the springs do in an ordinary clutch plate but much more so.
peanut
Active member
Smify you need to get someone to check it out for you. The symptoms you describe could also be caused by other components of the transmission.
The way to test is todrive at a steady 40mph in forth gear then put your foot on the gas then take it off again and back on the gas and off again. If there is a huge clunk or significant delay in take -up in the drive then you have a problem with the transmission somewhere. It could be a CV joint ot prop shaft UJ or clutch centre or possibly the gearbox .
If you jack the rear nearside wheel off the ground and put the gearbox in first gear you should be able to locate the problem by turning the rear wheel forward and back vigourously .
You need to get the car checked by a good Porsche technician before you buy anything or book the car in for work . A check shouldn't cost anything.
You'll also need a new clutch cover and thrust bearing which is what bumps the cost up so much.
The way to test is todrive at a steady 40mph in forth gear then put your foot on the gas then take it off again and back on the gas and off again. If there is a huge clunk or significant delay in take -up in the drive then you have a problem with the transmission somewhere. It could be a CV joint ot prop shaft UJ or clutch centre or possibly the gearbox .
If you jack the rear nearside wheel off the ground and put the gearbox in first gear you should be able to locate the problem by turning the rear wheel forward and back vigourously .
You need to get the car checked by a good Porsche technician before you buy anything or book the car in for work . A check shouldn't cost anything.
You'll also need a new clutch cover and thrust bearing which is what bumps the cost up so much.
peanut
Active member
I meant the rubber centre gave more cushioning effect than the plate with springs Oli []
Sorry Oli missed the additional question. I have to say I have only lost one clutch which was the rubber centred version. The rubber simply deteriorated with age (9 years 72000 miles)
I would gladly have another rubber version because I drive fairly calmly and never ever do racing starts and aggressive gear changes. I appreciate the gentle gear changes and cushioning of the transmission .
For a driver that drives aggressively I would suspect that the sprung clutch plate would be preferable because they don't break up and can take the extra stress of banging the clutch in and out on 6000+rpm and wheelie starts []
]Sorry Oli missed the additional question. I have to say I have only lost one clutch which was the rubber centred version. The rubber simply deteriorated with age (9 years 72000 miles)
I would gladly have another rubber version because I drive fairly calmly and never ever do racing starts and aggressive gear changes. I appreciate the gentle gear changes and cushioning of the transmission .
For a driver that drives aggressively I would suspect that the sprung clutch plate would be preferable because they don't break up and can take the extra stress of banging the clutch in and out on 6000+rpm and wheelie starts [
]Gotcha.ORIGINAL: peanut
I meant the rubber centre gave more cushioning effect than the plate with springs Oli [
I guess it probably does cushion more than springs. Snag is that it perishes. Shame Porsche never considered that their cars would still be going strong 20 years later. (Same problem with the cam chain on the S/S2 in so many ways. The cars have outlasted the design life of the component, and Porsche never considered that it should be a service item ... )
Oli.
smiffyraf1
New member
yeah have had a good old look today cv boot was a bit leaky but nothing major am pretty sure the clutch has gone as there isnt delay its more of a snatching so backs up what other people have mentioned, it seemed to have happened all of a sudden as well wasnt doing it yesterday.
smiffyraf1
New member
have found one for 375 +VAT dont think im gonna do much better than that
ORIGINAL: peanut
Once the rubber starts to deteriorate the connection between the engine and your transmission gets sloppy and eventually the rubber breaks up leaving small metal clips to take up the strain. These are a 'limp home device ' and eventually these will give up and you'll be stranded in the middle of nowhere in a blizzard at night with no drive. (ask me how I know [
how do you know? [
] well you did ask..
peanut
Active member
thats a good point Oli.
My first 944 was a lux and the zinc plating on that was fantastic. 22 years and no rust anywhere !
Obviously the S2 and late cars were made to last the 10 year warrantee period and not much more .
Its sad that so many 944's have been scrapped . It means we have some useful cheap spares to keep our cars on the road but eventually they will become scarer and the price will be beyond ordinary folk's pockets .
When i was young there were 100's of Mkll Jaguars in every scrapyard. You were tripping over them . I ripped all the gauges out of many to put in my old bangers. I'd love to own and drive a 3.8 mkll now but the prices for a good one have gone crazy.
My first 944 was a lux and the zinc plating on that was fantastic. 22 years and no rust anywhere !
Obviously the S2 and late cars were made to last the 10 year warrantee period and not much more .
Its sad that so many 944's have been scrapped . It means we have some useful cheap spares to keep our cars on the road but eventually they will become scarer and the price will be beyond ordinary folk's pockets .
When i was young there were 100's of Mkll Jaguars in every scrapyard. You were tripping over them . I ripped all the gauges out of many to put in my old bangers. I'd love to own and drive a 3.8 mkll now but the prices for a good one have gone crazy.
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