Clutch Fun

"CaptDale - is secretly British" (captdale) 04/26/2020 at 20:16 • Filed to: C4 Update, C4 Corvette

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My partner convinced me I should look at the clutch while I’m already there. I know he was right, but as I feared the amount of wear on the clutch really shows I should probably replace it since I am there and don’t want to have to pull this all again. My bigger issue is the flywheel.

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It has some hot spots, but is a dual mass, which means I can’t really have it machined. Since these are no longer made my two options are to run it with a factory clutch replacement or to do a conversion kit to a single piece flywheel.

I wouldn’t mind doing the single piece flywheel, but it is a bit pricey and not money I’d like to spend right now. What do you all think? I’ m not really sure if that flywheel is “good” to put a new clutch on.

For Sweden > CaptDale - is secretly British 04/26/2020 at 20:23

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Gripping

RacinBob > CaptDale - is secretly British 04/26/2020 at 20:38

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I assume its the C4 right? If it wasn’t slipping before, m y instinct is to say it will be fine. Materials can look bad and still work ok,. I am assuming there are no power adders.

RacinBob > RacinBob 04/26/2020 at 20:45

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The pressure plate and disk are the key parts to replace. as long as the pressure plate is new, and you have a new disk you will have a more than 50% improvement. I doubt you wou ld feel the difference if you did the flywheel as long as you did the disk and pressure plate .

RacinBob > CaptDale - is secretly British 04/26/2020 at 20:50

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PS, I have probably replaced 4 or 5 disks and pressure plates with success. Several of them because they had started slipping in race conditions. I have never replaced a flywheel, regardless what they looked like or regretted not changing one. 

SBA Thanks You For All The Fish > For Sweden 04/26/2020 at 21:17

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it’s a real pressure cooker

ITA97, now with more Jag @ opposite-lock.com > CaptDale - is secretly British 04/26/2020 at 21:46

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That friction surface doesn’t look as terrible as I expected it to  on the flywheel. I think your bigger question is the condition of the internals of the dual mass flywheel and if those will last the life of a new factory clutch. Normally dual mass flywheels are automatically replaced when a clutch is, assuming a normal car where replacement parts still exist. The tell tale on these cars is noise. If there is a drive train noise that sounds different idling in neutral with the clutch engaged vs. disengaged, you know there are worn parts. A worn throw out bearing will give a bearing noise in that scenario, a worn dual mass flywheel will give more of a rhythmic clacking type sounds.

CaptDale - is secretly British > RacinBob 04/26/2020 at 22:09

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I always have done all of the parts clutch, plate, t/o bearing, flywheel, and pilot bearing.

CaptDale - is secretly British > ITA97, now with more Jag @ opposite-lock.com 04/26/2020 at 22:12

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There is a way to check the condition of the dual mass flywheel, so I will have to take it off to see.

CaptDale - is secretly British > RacinBob 04/26/2020 at 22:12

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Well the ting is is the internals on the dual mass can go bad, so I will have a loot at that tomorrow. 

pip bip - choose Corrour > CaptDale - is secretly British 04/27/2020 at 03:51

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def put a new clutch in, as for flywheel?

see how the original one goes. 

I like cars: Jim Spanfeller is one ugly motherfucker > CaptDale - is secretly British 04/27/2020 at 10:19

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A wise man (the guy I bought my Golf from)  told me to always replace the clutch and flywheel whenever I pulled a transmission because it’s a bit of a headache to pull a transmission. However, he also told me China built ebay clutches were totally fine to use, and the car chatters quite a bit when I get on it on a hot day, so you probably don’t need to replace that flywheel.

CaptDale - is secretly British > I like cars: Jim Spanfeller is one ugly motherfucker 04/28/2020 at 21:07

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No you can resurface SMFs but DMFs are a pain cause you always should replace them cause they can be really bad if the internals are worn. With a SMF you can get away with not doing anything or at the very least having it resurfaced. 

CaptDale - is secretly British > pip bip - choose Corrour 04/28/2020 at 21:08

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Yeah Clutch is a must and pressure plate, but we shall see on the flywheel.

I like cars: Jim Spanfeller is one ugly motherfucker > CaptDale - is secretly British 04/28/2020 at 21:09

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I’ve never had a car with a dual mass flywheel. I’m surprised they aren’t produced anymore, especially since your car isn’t THAT uncommon. 

CaptDale - is secretly British > I like cars: Jim Spanfeller is one ugly motherfucker 04/30/2020 at 18:17

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They are expensive ($600 from GM when they still had them) and most auto makers if there isn’t a real need to keep that part around for other models they discontinue the part quite quickly. Also the supplier Valeo stopped producing them so that could be part of it too. 

I like cars: Jim Spanfeller is one ugly motherfucker > CaptDale - is secretly British 04/30/2020 at 18:23

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That stinks. And I imagine a custom DMF is more expensive than a SMF conversion. 

CaptDale - is secretly British > I like cars: Jim Spanfeller is one ugly motherfucker 04/30/2020 at 18:32

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And unheard of. Honestly I’d rather go SMF anyway as DMF are not particularly  sporty in nature and can’t take hard abuse of autocross or racing which I’d like to do once the car is looking tip top.

I like cars: Jim Spanfeller is one ugly motherfucker > CaptDale - is secretly British 04/30/2020 at 19:51

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I’d love to see a smf/dmf comparison. A friend has a GT350 with a dmf. It seems pretty sporty to me. 

CaptDale - is secretly British > I like cars: Jim Spanfeller is one ugly motherfucker 05/03/2020 at 16:16

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Well I am sure that modern DMF compared to that of the early 90s are a big step up in the game. The main reason GM had to use a DMF was the ZF box has a bit of chatter at idle and out of gear that a sprung clutch disk could not take up. So hence the big spinning disk of rubber.

I like cars: Jim Spanfeller is one ugly motherfucker > CaptDale - is secretly British 05/03/2020 at 16:35

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Yeah that makes sense I suppose. Does the SMF conversion have anything besides a new flywheel/beefier clutch? Or is there a modification to the slave cylinder etc?

CaptDale - is secretly British > I like cars: Jim Spanfeller is one ugly motherfucker 05/03/2020 at 17:28

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The only changes are to a SMF and a sprung clutch disc. The pressure plate is the same design as is the TO. The very first kits for these were people taking Camaro LT1 SMF and having them cut down to fit the Vette, then use a Camaro sprung clutch disk, and a Corvette Pressure plate. Since the LT1 Camaros used a T56 and not the ZF it wasn’t a complete swap.

I like cars: Jim Spanfeller is one ugly motherfucker > CaptDale - is secretly British 05/03/2020 at 19:25

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Cool. Thanks!

CaptDale - is secretly British > I like cars: Jim Spanfeller is one ugly motherfucker 05/03/2020 at 20:20

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Qui te welcome