well, after getting tired of the slipping clutch i decided to take a peek and pulled it out. :0 the disk is still has 90% of it's material, the damage is to the pressure plate and the flywheel. the pressure plate is glazed and hot spotted. the flywheel sufered much worse. is has to 'blue' spots 180* apart on the wheel and is cracked and crazed like a busted windshield. glazed over in many spots as well. i was running an AP racing clutch that was rated for 364lbs of torque with a static clamp load of 2400lbs. clearly i'm putting out more looks like i'll be going custom, i've talked to Mcleod who is willing to make me a line of ferrari flywheels and double disk clutch packs. i'm also talking with RAM. i'll see in the next few weeks where cost is and who i decide to go with. i'm leaning on mcleod only becouse they have the disks off the shelf with our odd 1 1/4 x 10 spline. here's a small pic of the damage, i'll see if i can get a better one. Image Unavailable, Please Login
Nice work. You glazed that flywheel like a Thanksgiving turkey! Go with a custom clutch............like mine. Image Unavailable, Please Login
depends on who did the clutch, there are literaly hundreds of clutch mfgs out there. the commen ones are tilton ram mcleod hays AP centerforce quatermaster clutch master RPS and on.... the one downside to multi clutch packs is the need to replace the pressure plate at the same time, it adds $$$ but if done right the multi disk will last longer so it's a wash. i'm on new ground here as most 308's don't have this problem.
I got it made for me by fellow Aussie Fchatter.......ferrarifixer. He did a fantastic job with it and I could not be happier. Here are the 2 related threads to my 348 clutch madness from 2 years ago. http://www.ferrarichat.com/forum/showthread.php?t=86136&page=8 http://www.ferrarichat.com/forum/showthread.php?t=93933&page=11
Scott, It looks like you glazed the wheel wheel, after that it was all over....it looks familar I pulled out in 3rd gear, the engine's got so much torque I didn't really realize until I went to shift.....after that it was just never the same and looked a lot like yours when it came apart..... Quarter master has a dual disc 7.25" clutch pack that can be used right off the shelf that is pretty reasonable. Nick sells it as part of has kit, but I'm sure it could be adapted to a stock flywheel. They have a several friction materials available. Steve is running one he got from Nick and likes it...athough it a bit digital I guess. Tilton also has stuff that would work. I adapted a tilton triple disc carbon-carbon to my flywheel and it's been pretty happy, nice and smooth. They have other choices too.
A related question from one who is out of touch with the newer clutch types. I was tought that the three finger clutches, especially the "Long" type clutch was better for high RPM applications as they increase clamping force as RPM increases. Why are diaphram clutches used on Ferrari's? I have a three finger Borg and Beck pressure plate with 10.5" Hays disc on my 440 GTX that easilly handles about 500 LB-FT of torque. Just want to learn!
UMM, Interesting link. However, I must quibble with: "Diaphragm clutches rely completely on static pressure which is unaffected by engine RPM." The pedal pressure on a 308/328 clutch is a LOT LIGHTER at 6000 RPM than it is at 2000 RPM. Try it for yourself, the difference is dramatic. I can't see how pedal pressure can be dramaticly lighter unless the pressure on the clutch disc is also lighter. Anyway, If I ever need another stock application clutch i'm going to have Centerforce rebuild one for me. chrismorse is really happy with the one they did for his 308.
On what car/gearbox did you put the triple disc on? Because i tried that also on a 348 Gearbox. But the splineshaft on the gearbox is to short. I only got two discs over it. Then i ran out of spline. But ok the two discs should still be enough to transfer my horses and torques without slip And its 7kg lighter with much less inertia. Some pictures of it and the pony maker. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
