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So with the help of Luke and a few others today we got the gearbox out of my car to try and find out what was behind the bad grinding sounds and gear selecting problems. As soon as the clutch came off the reason for the grinding sound was pretty clear. The clutch centre was rubbing on the bolt heads on the centre of the flywheel. Im not to sure what caused this to happen but im very happy that the clutch didn't explode at the time attack on monday as the result could have been pretty bad.

I'll have a look on here to see what i can find but if anyone has any hook ups with clutches let me know. Gonna go for a twin plate this time round, need some thing thats good for 300kw+

flywheel.jpg

clutch2.jpg

clutch.jpg

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Woah! Lucky it didn't let go at the time attack.

Glad to hear you caught it just in time. Didn't look like it would have lasted much long.

and +1 to never seeing a clutch like that before. :)

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Kubos motorsport, do good GENUINE Exedy clutches, all parts branded Exedy, not mix and match crap. Talk to him, very helpfull, good quality and great prices. There are some RB25/30s running these clutches, i'm pretty sure cubes was impressed with his.

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The clutch centre was rubbing on the bolt heads on the centre of the flywheel. Im not to sure what caused this to happen but im very happy that the clutch didn't explode at the time attack on monday as the result could have been pretty bad.

Pretty clear that the clutch centre let go 1st and then bowed out against the flywheel bolts......obviously bolts need to be replaced now regardless if they're still tight.

Seen clutches like that before....usually caused by hard launches or flat changing causing the centre to over flex.....also if it's excessively tight over the splines during release.

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The springs probably bottomed out also, causeing shock loading which made it crack. I'm no expert on clutches but I know my metals, those cracks look like a combination of high temps and shock loading.

I was just saying the other day at vilis that i didn't like those clutches after a bad exerience I had with mine.

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i could probably get you an os for a decent price.

If you could find out that would be awesome, I'm after a twin plate to take 350-400rwkw and lots of track use. Also need it ASAP!

Cheers!

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True twin plates are never going to be as good as a single for very quick gear changes as you're attempting to release 2 driven plates as opposed to 1.

However, we don't have a drag strip and grip racing doesn't require the lightning fast changes that drag racing does, hence why I went for the Coppermix Twin plate......which in actual fact, is not a true twin plate (ie. with intermediate plate) cause it uses a single sprung Boss Drive. The other reason I went this way is cause of the lighter diaphram that you can get away with and still get a greater clamping pressure.

I've never ever liked solid centre style driven plates or the metal button style ones either cause they're not forgiving as a daily driver. Also double diaphram pressure plates used to be the rage years ago but your left calf muscle needs to be bigger that your right, lol. Drivelines also hate these 3 style of setups.

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yeah I had one let go in similar fashion , opened up the pressure plate to find shrapnel inside it on my RX7, Aluminum flywheel / Center force racing clutch

make sure you check the run out on the flywheel, bet it could be borderline to thin?

also check the bearings on the input shaft ,always replace the center pilot bearing, you call it something else in OZ. but it goes into the crankshaft?

good time to swap out the seals on the input shaft as well ?

and if your real bored polish the casing to mirror finish..hahahah

sucks mate but least your floor doesnt have a hole in it from the flywheel

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yeah I had one let go in similar fashion , opened up the pressure plate to find shrapnel inside it on my RX7, Aluminum flywheel / Center force racing clutch

make sure you check the run out on the flywheel, bet it could be borderline to thin?

also check the bearings on the input shaft ,always replace the center pilot bearing, you call it something else in OZ. but it goes into the crankshaft?

good time to swap out the seals on the input shaft as well ?

and if your real bored polish the casing to mirror finish..hahahah

sucks mate but least your floor doesnt have a hole in it from the flywheel

Scopot Bush?!

Edit: Damn word filter, i mean one of these - i bet the word filter messed with the link.

Edited by Aberax
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