Originally posted by N20LT4Bird
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Spec stage 2 clutch question
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fastTa
Most likely the flywheel was not set up properly on the lathe. Unfortunately this is fairly common when having flywheels turned. Part operator error and part level of difficulty. If the wrong adapter is used or if they do not use enough spring pressure, the surface will not be cut true. Another thing is that due to the mass of the flywheel, it is hard to balance properly on the lathe to get a true cut.
You could take the flywheel back out and have someone else re-turn it to just remove a few thousandths. This may help, but might not totally fix the problem.
Just a thought, but you might check your local salvage yards and look for a used one out of a car with fairly low mileage.
The other alternative, although not the most economical, would be to get a new flywheel.
Good luck Jeff!
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Originally posted by fastTAMost likely the flywheel was not set up properly on the lathe. Unfortunately this is fairly common when having flywheels turned. Part operator error and part level of difficulty. If the wrong adapter is used or if they do not use enough spring pressure, the surface will not be cut true. Another thing is that due to the mass of the flywheel, it is hard to balance properly on the lathe to get a true cut.
You could take the flywheel back out and have someone else re-turn it to just remove a few thousandths. This may help, but might not totally fix the problem.
Just a thought, but you might check your local salvage yards and look for a used one out of a car with fairly low mileage.
The other alternative, although not the most economical, would be to get a new flywheel.
Good luck Jeff!
BTW It was flat ground on a grinder with a cup wheel not turned on a lathe.2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"
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fastTa
Actually I meant to say grinder (I just got my rotors turned today and was thinking brakes) and yes you are supposed to use a flywheel grinder. A lathe cannot effectively remove scoring and it cannot reference the cluch surface to the cranshaft mounting surface. The
Jeff, did they use a straight edge to measure any any high spots? Did they reference the clutch surface to the crank mounting surface?
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Originally posted by MN6WS6Please tell me you didn't just say you used a grinder on your flywheel. Please don't say that...
Originally posted by fastTAActually I meant to say grinder (I just got my rotors turned today and was thinking brakes) and yes you are supposed to use a flywheel grinder. A lathe cannot effectively remove scoring and it cannot reference the cluch surface to the cranshaft mounting surface. The
Jeff, did they use a straight edge to measure any any high spots? Did they reference the clutch surface to the crank mounting surface?
I don't think he used a straight edge on the flywheel before he ground it. The flywheel didn't look that bad. He said it only took about .010 to completely clean it up. He said it was in good shape. I was surprised there weren't even any marks on the outside teeth.2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"
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Rip it out and go Lightweight aluminum!!97 Chevy 'Raro Z28 M6- Ported & Polished LT1 heads,beehives,1.6/1.94 valves, 226/231 custom cam,K&N FIPK, 94-95 BBK shorty's,ORY,Magnaflow Catback,no cats,BMR LCA Relocation Brackets,Lower Control Arms,Adjustable Panhard Bar,Eibach Pro Kit,SPEC Stage 1,Walbro 255 Fuel Pump,30LB Injectors,Pro 5.0,Short stick,MSD 8.5's,NGK TR55's,LT4KM
01 Honda CBR600 F4i-Two bro's,Corbins,SS brake lines
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I went with the Spec 3 and the aluminum flywheel. Yes, it was grabby and vibrated at starting off in first or reverse. I just developed a "finese" for letting off on the clutch, and it taught me over a thousand mile break in. Now it and me are fine.The Old Guy! '94 z-28, m-6, t-tops, go-fast red, 316k. Now with '96 engine w/ Lt-4 hot cam, roller rockers, heavy duty timing chain, and Spec stage 2 clutch.
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fastTa
Originally posted by Jeff 95 Z28He did not resurface the flywheel to crank surface. I've never heard of redoing that surface. It's set below the surface and would require a very small cup wheel to grind but I guess it could be done. I've never seen a cup wheel that small but I didn't specialize in grinding. I hate grinding. It's a dirty slow process.
I don't think he used a straight edge on the flywheel before he ground it. The flywheel didn't look that bad. He said it only took about .010 to completely clean it up. He said it was in good shape. I was surprised there weren't even any marks on the outside teeth.
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A normal person would deduce that you had used a hand grinder by reading your post, which is why I said what I said. There was no mention of a machine specifically used for doing that, so it scared the bejeezus out of me when you posted that.
Anyway, I can't recommend using an aluminum flywheel if you expect to keep this as a daily driver. You lose torque with an aluminum flywheel, and torque is what helps us kill the ricers out of the hole. I also tow a small trailer with my car, and an aluminum flywheel makes that much more difficult. I have no problems with my machined flywheel, so I don't know what could be wrong with it that could be causing your problem. I do however agree with the "don't turn brake rotors" argument because I have had the pulse problem as well. I change brake pads and leave the rotors alone until they are out of spec, then replace them with new ones. But a flywheel is a little different. You don't have to put a "wave" in a flywheel to kick the pad back out like you do a brake rotor, so I don't know how you could machine it wrong. Flat is flat, pretty simple."No, officer, that bottle is my onboard Halon system"
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Originally posted by MN6WS6A normal person would deduce that you had used a hand grinder by reading your post, which is why I said what I said. There was no mention of a machine specifically used for doing that, so it scared the bejeezus out of me when you posted that.2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"
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That clutch price isn't that bad in my book. When compared to the other performance clutches on the market, it's actually a deal. And like somebody said earlier, if it's determined that it is a clutch problem, Spec will switch it out for you. They are really good people, and will do whatever is necessary to fix the problem, so give them a chance before you go back stock. I've heard a lot of good things about Spec which is why I went with them."No, officer, that bottle is my onboard Halon system"
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When i had my clutch done, the mechanic showed me a book that stated clearly whenever you replace the clutch on the f-body it must be equipped with a brand new flywheel, he told me i would face problems with a resurfaced flywheel. Just some input1996 Z-28 6 speed, Airfoil, K&N FIPK, Flowmaster muffler, Motive 3.73 gears, BBK shorty headers, cut-out, LS1 Driveshaft, no power options (Rare), Prothane tranny mount, MSD 8.5mm wires, Accel U-Groove Plugs, Chrome hurst short throw, TB Bypass, ES Torque arm mount, BMR subframe connectors (weld-in), Lt4 Knock Module, Descreened MAF, '02 SS wheels, Pioneer HU, MTX & JL amps, 2 12" JBL's, T-Top Conversion!
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My buddy came over and drove the car. Well sort of. He let the clutch out, rolled it about a foot and stopped. He said he thought it was the flywheel too. So all of ya'll and him made me go ahead and order a new flywheel. Looks like another fun weekend.2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"
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