exedy hyper single sr20det, fixable? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jimmytango00 · 07-17-2009, 03:23 AM

so i bought this exedy clutch for dirt cheap on craigslist. According to the owner and from what i understood, he resurfaced the pressure plate which created more space in between, so he lost clamp force and the clutch would slip under load. Now im hoping this is an easy fix , something a machine shop can take care of. I was thiking they can resurface it and take very very little just to clean it up and maybe trim the area where the bolts go through into the fly wheel to bring the pressure plate in more and close in that space, not sure if it'll work but maybe worth a shot? Im no clutch expert so all this is based on the little bit of reading i did.

hopefully some gurus can jump in.

If i do resurface, i will make sure it is a good and well known machine shop.

blu808 · 07-17-2009, 05:35 AM

if you can get the specs on the pressure plate thickness, then measure your current one it should tell you if that is really the case.

It could be worn out clamps on the pressure plate, or a glazed clutch disc.

fast-datsun · 07-17-2009, 10:49 AM

YOU getting into DANGER area pressure plates can explode and cause damage to your car and your legs. Do not attempt a repair by grinding or modifing the pressure plate, have a clutch company repair it or JUNK it .
You life or legs are worth more than a few bucks.....

tommyboi · 07-17-2009, 11:14 AM

i hear some machine shops will take it apart and put in like washers or spacers or something to get it to proper height. but as fast datsun said is it worth it?...

XenoVibe · 07-17-2009, 11:15 AM

^ +1
Anyone remember the discussion of those ebay clutchs that were stock but painted red to look like aftermarket? Oh it was XTD or XTR clutches.

Anyways, some guys clutch broke and ripped up through the floorboards, firewall, dashboard and through the windshield. Now would you really wanna put your balls in that situation just to save a few bucks? You have to take the tranny out anyway, why not spend a few extra on something that will last longer and save you money in the long run?

jimmytango00 · 07-17-2009, 11:20 AM

like said above,if i did make any modificaction to it, i would have a professional machine shop take care of it, I will not attempt to do any "grinding" my self.

Im thinking if what this guy said is true then i can just have a machine shop take a little off of where the bolts go in to bring it in closer.

what do you guys think?

jimmytango00 · 07-17-2009, 11:25 AM

Quote:

Originally Posted by XenoVibe

^ +1
Anyone remember the discussion of those ebay clutchs that were stock but painted red to look like aftermarket?

Oh it was XTD or XTR clutches.

This isnt a ebay clutch. I was on the porsche forums yesterday and alot of the guy's there resurface the pressure plate but im talking about like 0.5 mm or less. Im not sure how much the guy who sold it to me chopped off but i hope its not much. Im having a hell of a time findin the specs on the pressure plate (thickness) so i can messure it.

WagDatto · 07-17-2009, 11:32 AM

Here are a few pictures I found online of a cobra who's clutch/pp/flywheel exploded...

And here's my buddy's 510... The bolts holding the PP to the flywheel threaded out, the PP swung around and blasted a hole in his bellhousing...

Don't trust what you don't know...

fast-datsun · 07-17-2009, 11:33 AM

a machine shop can not saftely do it because they DO NOT know the safe limints and if the previous own took to much off already you asking for trouble. I have seen and been in a car when the pressure plate exploded and its not pretty. It lifted our car 12 " off the ground and send parts 100' in every direction blowing a hole in the saftey shield and a 6" hole in the floor by the gas pedal.....

XenoVibe · 07-17-2009, 11:35 AM

Quote:

Originally Posted by jimmytango00

This isnt a ebay clutch. I was on the porsche forums yesterday and alot of the guy's there resurface the pressure plate but im talking about like 0.5 mm or less. Im not sure how much the guy who sold it to me chopped off but i hope its not much. Im having a hell of a time findin the specs on the pressure plate (thickness) so i can messure it.

My point was a clutch isnt something you want to go cheap on. I mean, what if they resurface it for you but it doesnt work. You wont get your money back, you'll be wasting more money and reducing the longevity of it. Not to mention if it only works until you're driving at high speeds and it cracks?

Im just saying that the cons outweigh the pros and that i'd personally rather opt for a new (6puck ACT) clutch or something instead just because it will be more predictable.

And .. Wow Datto thats intense.. and i have the same shoes as the guy in the first pic :P

XenoVibe · 07-17-2009, 11:36 AM

"delete this post of mine pl0x"

jimmytango00 · 07-17-2009, 11:54 AM

just got off the phone with exedy, he said its not recommended to resurface a PP but if it is done you need to take off some meat from the bolt hole section. So pretty much they said to find out how much he cut and take that off from that section and the clutch should work fine if everything else is in good shape.

fast-datsun · 07-17-2009, 02:34 PM

YOUR car and YOUR life to do with as you want....

jimmytango00 · 07-17-2009, 02:42 PM

yeah might just buy a new pressure plate and get it over with.

unless someone wants to buy this so i can just get a stock clutch.

anyone?

sil*eighty · 07-17-2009, 02:46 PM

Quote:

Originally Posted by WagDatto

Here are a few pictures I found online of a cobra who's clutch/pp/flywheel exploded...

And here's my buddy's 510... The bolts holding the PP to the flywheel threaded out, the PP swung around and blasted a hole in his bellhousing...

Don't trust what you don't know...

not sure about the first one or the others for that matter,
but the second and third picture are of a skyline here in Edmonton Alberta. during friday night "street racing" i had it on tape lol
poor matt but hes onto much bigger and better things now

jimmytango00 · 07-17-2009, 02:47 PM

Quote:

Originally Posted by sil*eighty

not sure about the first one or the others for that matter,
but the second and third picture are of a skyline here in Edmonton Alberta. during friday night "street racing" i had it on tape lol
poor matt but hes onto much bigger and better things now

any idea what the cause was?

sil*eighty · 07-17-2009, 03:48 PM

I could ask him if you would like?

discosteak · 07-18-2009, 02:05 AM

haha yeah i was about to say that cobra looks just like an r32

sil*eighty · 07-19-2009, 12:49 AM

i just asked him

"What happened was the flywheel was remachined, they didn't machine it within tolerance, it developed a heatcrack due to the metal being thinner then spec and basically the flywheel cracked. The crack was unlucky, thats what caused all the damaged, because when it cracked, it broke a spot weld on the ring gear. The motor was turning 8,000 RPM at this point and the ring gear slowly peeled off, acting like a sawblade by cutting the exhaust, frame, bell housing and starter to pieces. When all the welds finally broke, it blew through the hood."

WagDatto · 07-19-2009, 01:15 AM

Like I said, I just found pictures online and linked them. They were posted and I saw the word Cobra, so I just copied. Regardless, the damage would be the same under any circumstances.

godsmack · 07-19-2009, 04:08 AM

ya i saw that happen b4 also. personally i'd buy a new one. i will never shorten a strength point for something that spins that fast. nothing might ever happen but imho its not worth the risk.

jimmytango00 · 07-19-2009, 04:44 AM

i wont be touching the disk anymore only the area where the bolts go through into the flywheel and it will be done by a machine shop, the previous owner said after they resurfaced the PP, it would grab on flat grounds but not going up hills or under heavy load. Im assuming they didnt grind more than 1mm so it just lost some clamp force. IM getting a shatter shield made aswell incase of anything. If i had 375 to spend on a pressure plate it would be on its way by now. there are no heat cracks on the PP and everything else seems good.

royisagas · 02-28-2013, 11:28 AM

If the clamping surface was surfaced than you will loose clamping force and durability
The usable range of travel is limited for pressure plates
The disc is considered worn out when it is .030 " thinner, if that much was removed from the clamping face, it's no gonna work. If you want to sell it as is let me know. Im making a flywheel for my next project car, and I could compensate for the changes made to That one
Royisagas

07-17-2009, 03:23 AM	#1
jimmytango00 Users Awaiting Email Confirmation Join Date: Jan 2006 Location: Los Angeles, CA Age: 36 Posts: 2,249 Trader Rating: (14) Feedback Score: 14 reviews	exedy hyper single sr20det, fixable? so i bought this exedy clutch for dirt cheap on craigslist. According to the owner and from what i understood, he resurfaced the pressure plate which created more space in between, so he lost clamp force and the clutch would slip under load. Now im hoping this is an easy fix , something a machine shop can take care of. I was thiking they can resurface it and take very very little just to clean it up and maybe trim the area where the bolts go through into the fly wheel to bring the pressure plate in more and close in that space, not sure if it'll work but maybe worth a shot? Im no clutch expert so all this is based on the little bit of reading i did. hopefully some gurus can jump in. If i do resurface, i will make sure it is a good and well known machine shop.

07-17-2009, 05:35 AM	#2
blu808 Post Whore! Join Date: Dec 2002 Location: Campbell, Ca Age: 38 Posts: 5,010 Trader Rating: (3) Feedback Score: 3 reviews	if you can get the specs on the pressure plate thickness, then measure your current one it should tell you if that is really the case. It could be worn out clamps on the pressure plate, or a glazed clutch disc. __________________

07-17-2009, 11:32 AM	#8
WagDatto Zilvia FREAK! Join Date: Nov 2007 Location: Sacramento, NorCal Posts: 1,283 Trader Rating: (6) Rides Gallery: WagDatto Feedback Score: 6 reviews	Here are a few pictures I found online of a cobra who's clutch/pp/flywheel exploded... And here's my buddy's 510... The bolts holding the PP to the flywheel threaded out, the PP swung around and blasted a hole in his bellhousing... Don't trust what you don't know... __________________ http://garagezoku.blogspot.com

07-19-2009, 01:15 AM	#20
WagDatto Zilvia FREAK! Join Date: Nov 2007 Location: Sacramento, NorCal Posts: 1,283 Trader Rating: (6) Rides Gallery: WagDatto Feedback Score: 6 reviews	Like I said, I just found pictures online and linked them. They were posted and I saw the word Cobra, so I just copied. Regardless, the damage would be the same under any circumstances. __________________ http://garagezoku.blogspot.com

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07-17-2009, 10:49 AM	#3
fast-datsun Leaky Injector Join Date: Aug 2002 Posts: 116 Trader Rating: (0) Feedback Score: 0 reviews	YOU getting into DANGER area pressure plates can explode and cause damage to your car and your legs. Do not attempt a repair by grinding or modifing the pressure plate, have a clutch company repair it or JUNK it . You life or legs are worth more than a few bucks.....

07-17-2009, 11:14 AM	#4
tommyboi Join Date: May 2008 Location: Minnesota Posts: 45 Trader Rating: (5) Feedback Score: 5 reviews	i hear some machine shops will take it apart and put in like washers or spacers or something to get it to proper height. but as fast datsun said is it worth it?...

07-17-2009, 11:15 AM	#5
XenoVibe BANNED Join Date: Jun 2009 Location: Canuckistan Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	^ +1 Anyone remember the discussion of those ebay clutchs that were stock but painted red to look like aftermarket? Oh it was XTD or XTR clutches. Anyways, some guys clutch broke and ripped up through the floorboards, firewall, dashboard and through the windshield. Now would you really wanna put your balls in that situation just to save a few bucks? You have to take the tranny out anyway, why not spend a few extra on something that will last longer and save you money in the long run?

07-17-2009, 11:20 AM	#6
jimmytango00 Users Awaiting Email Confirmation Join Date: Jan 2006 Location: Los Angeles, CA Age: 36 Posts: 2,249 Trader Rating: (14) Feedback Score: 14 reviews	like said above,if i did make any modificaction to it, i would have a professional machine shop take care of it, I will not attempt to do any "grinding" my self. Im thinking if what this guy said is true then i can just have a machine shop take a little off of where the bolts go in to bring it in closer. what do you guys think?

07-17-2009, 11:33 AM	#9
fast-datsun Leaky Injector Join Date: Aug 2002 Posts: 116 Trader Rating: (0) Feedback Score: 0 reviews	a machine shop can not saftely do it because they DO NOT know the safe limints and if the previous own took to much off already you asking for trouble. I have seen and been in a car when the pressure plate exploded and its not pretty. It lifted our car 12 " off the ground and send parts 100' in every direction blowing a hole in the saftey shield and a 6" hole in the floor by the gas pedal.....

07-17-2009, 11:36 AM	#11
XenoVibe BANNED Join Date: Jun 2009 Location: Canuckistan Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	"delete this post of mine pl0x"

07-17-2009, 11:54 AM	#12
jimmytango00 Users Awaiting Email Confirmation Join Date: Jan 2006 Location: Los Angeles, CA Age: 36 Posts: 2,249 Trader Rating: (14) Feedback Score: 14 reviews	just got off the phone with exedy, he said its not recommended to resurface a PP but if it is done you need to take off some meat from the bolt hole section. So pretty much they said to find out how much he cut and take that off from that section and the clutch should work fine if everything else is in good shape.

07-17-2009, 02:34 PM	#13
fast-datsun Leaky Injector Join Date: Aug 2002 Posts: 116 Trader Rating: (0) Feedback Score: 0 reviews	YOUR car and YOUR life to do with as you want....

07-17-2009, 02:42 PM	#14
jimmytango00 Users Awaiting Email Confirmation Join Date: Jan 2006 Location: Los Angeles, CA Age: 36 Posts: 2,249 Trader Rating: (14) Feedback Score: 14 reviews	yeah might just buy a new pressure plate and get it over with. unless someone wants to buy this so i can just get a stock clutch. anyone?

07-17-2009, 03:48 PM	#17
sil*eighty Zilvia Junkie Join Date: Sep 2007 Location: Edmonton Alberta Posts: 378 Trader Rating: (6) Feedback Score: 6 reviews	I could ask him if you would like?

07-18-2009, 02:05 AM	#18
discosteak Leaky Injector Join Date: Aug 2007 Location: Maryland Age: 35 Posts: 109 Trader Rating: (0) Feedback Score: 0 reviews	haha yeah i was about to say that cobra looks just like an r32

07-19-2009, 12:49 AM	#19
sil*eighty Zilvia Junkie Join Date: Sep 2007 Location: Edmonton Alberta Posts: 378 Trader Rating: (6) Feedback Score: 6 reviews	i just asked him "What happened was the flywheel was remachined, they didn't machine it within tolerance, it developed a heatcrack due to the metal being thinner then spec and basically the flywheel cracked. The crack was unlucky, thats what caused all the damaged, because when it cracked, it broke a spot weld on the ring gear. The motor was turning 8,000 RPM at this point and the ring gear slowly peeled off, acting like a sawblade by cutting the exhaust, frame, bell housing and starter to pieces. When all the welds finally broke, it blew through the hood."

07-19-2009, 04:08 AM	#21
godsmack Zilvia Addict Join Date: Feb 2009 Location: Allentown, PA Age: 36 Posts: 652 Trader Rating: (0) Feedback Score: 0 reviews	ya i saw that happen b4 also. personally i'd buy a new one. i will never shorten a strength point for something that spins that fast. nothing might ever happen but imho its not worth the risk.

07-19-2009, 04:44 AM	#22
jimmytango00 Users Awaiting Email Confirmation Join Date: Jan 2006 Location: Los Angeles, CA Age: 36 Posts: 2,249 Trader Rating: (14) Feedback Score: 14 reviews	i wont be touching the disk anymore only the area where the bolts go through into the flywheel and it will be done by a machine shop, the previous owner said after they resurfaced the PP, it would grab on flat grounds but not going up hills or under heavy load. Im assuming they didnt grind more than 1mm so it just lost some clamp force. IM getting a shatter shield made aswell incase of anything. If i had 375 to spend on a pressure plate it would be on its way by now. there are no heat cracks on the PP and everything else seems good.

02-28-2013, 11:28 AM	#23
royisagas Join Date: Feb 2013 Location: Vancouver Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	If the clamping surface was surfaced than you will loose clamping force and durability The usable range of travel is limited for pressure plates The disc is considered worn out when it is .030 " thinner, if that much was removed from the clamping face, it's no gonna work. If you want to sell it as is let me know. Im making a flywheel for my next project car, and I could compensate for the changes made to That one Royisagas