: Can I replace my 11" clutch with a 12"???
Jul 13th, 09, 07:00 PM
Put 'er on the flatbed tow truck this afternoon. I was asking way too much from my non-performance clutch setup as I kept doing little power adders. She finally let loose and now it's time for that Centerforce dual friction kit I've been looking at. I currently have an 11" setup and I'm wondering if I can get away with a 12". I have really big tires and some decent torque so I thought the more clutch surface area the better. Any reasons/disadvantages as to why I wouldn't want to do that? Once I get the trans and the flywheel off, How will I know if my current setup will handle a 12"? Is there a way to measure and how close can I come to the pressure plate mounting holes in the flywheel? Thanks!
South Side Goons & Hitmen
Jul 13th, 09, 10:58 PM
dubs, if it's a 168 tooth flywheel which it more than likely is a 12" disc should work. I tried doing a search on line for you and here is the best article I could find. It's a T56 install with a 12" clutch disc in a 1992 RS Camaro. I know, what an RS?. Yep. Pretty good article though. I hope it helps. http://www.chevyhiperformance.com/techarticles/148_0502_chevrolet_305_ci_engine_build/index.html
I personally like Ram Clutches. http://www.ramclutches.com/
Jul 14th, 09, 04:00 AM
Call Centerforce and ask, but yes you can probably get the bigger clutch in there. I run a McLeod Dual Performance 12-inch behind my BBC, on a GM 168-tooth flywheel, inside an OE 621 bell. No clearance issues, and it is one smooth, strong clutch. I would assume CF offers something similar, but it is best to check with CF tech (if they have decent tech dept anymore).
Jul 14th, 09, 07:22 AM
Well she's a 168 so I will call CF and see what they say. What good, sound advice.....call the manufacturer! duh! lol
Jul 14th, 09, 08:10 AM
I had similar issue with my clutch that wouldn't hold under boost. It was a performance clutch but wasn't strong enough. I didn't go with a larger set up for space reasons so I went the multi disc route. I just put a McLeod Street Twin in my car. So far it's holding great behind my Blown BBC with sticky, soft compound 18.5 Mickeys. McLeod says they are good for 1000 hp. I really like the set up. I also installed their SFI bell at the same time as the clutch swap. My set up is slightly different since I'm running a T56 with a puller style clutch and a hydrolic set up but McLeod offers the Street Twins for most applications. The other applications are much cheaper than what I had to spend too...lol.
Here's a picture I posted a little while back in the ProStreet section when I installed the twin disc set up.
Jul 14th, 09, 11:33 AM
ouch! that looks expensive!
Jul 14th, 09, 12:00 PM
ouch! that looks expensive!
If you mean my set up, you're right. It was pretty pricey. I really didn't have many, if any, other options since most of companies I spoke to were unsure their set ups would hold the torque of my motor with a puller style clutch. Not much out there for my application at any price, but for a "normal" application the McLeod Street Twin is about half the price I paid for the hybrid set up I had to use.
Jul 16th, 09, 06:48 AM
I just thought that I would add to this post that yes, in fact, the CF dual friction clutch WILL work with a stock BBC flywheel. What's kinda cool is that even though it's a bigger clutch, it is designed a little bit shallower out at the edges. It actually has more room in the bell housing than the stock 11" one had and man, there is some serious clamping surface area. You also DO NOT need a big block 12" truck bell housing. I'm sure the 621 works. I can also tell you that the plain jane one I have works too. I am stoked!! I can't wait to go break my rear end!!! lol
Jul 17th, 09, 06:35 AM
I am stoked!! I can't wait to go break my rear end!!! lol
It's funny you say that. About three weeks after I installed the twin disc in my car I replaced the third member in the rear . It started making noise not long after the clutch swap and now that the clutch was holding the rear probably wasn't going to be around much longer. I was never real happy with the set up I had anyway so I swapped out the whole thing for a Strange Nodular set up with a TrueTrac. I also went with a different gear ratio while I was at it. I figured I'd replace it before I broke it.
Jul 17th, 09, 04:42 PM
It's been printed of GM's dual disc clutch set-up that you can leave it in your will, it's that good!