Clutch disc wider than flywheel surface
Thread Starter
Racer
Joined: May 2007
Posts: 407
Likes: 0
From: San Antonio Texas
Clutch disc wider than flywheel surface
I just got my Centerforce DFX 12" clutch in. I measured the disc diameter and the diameter of the friction area on the flywheel. The disc is 0.125" wider in diamter than the friction area on the flywheel. I know it is a small difference, but I want to make sure it wont cause any issues down the road.
This is the flywheel: http://gripforce.com/store/index.php...roducts_id=409
The manufacturer says that if the Centerforce is made to work with my stock flywheel (which it is) then I will not have aany issues with theirs.
Does anyone have any insight?
This is the flywheel: http://gripforce.com/store/index.php...roducts_id=409
The manufacturer says that if the Centerforce is made to work with my stock flywheel (which it is) then I will not have aany issues with theirs.
Does anyone have any insight?
Thread Starter
Racer
Joined: May 2007
Posts: 407
Likes: 0
From: San Antonio Texas
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Your best choice in my opinion is to talk with the flywheel manufacture with your dimensions. I would expect that as long as the disc contact area on the flywheel is raised above the rest of the noncontact surface, the clutch system will work fine. I’m sure you know that the launches with this flywheel will take some getting used to. My guess is you will be fine.
Thread Starter
Racer
Joined: May 2007
Posts: 407
Likes: 0
From: San Antonio Texas
Matt,
Your best choice in my opinion is to talk with the flywheel manufacture with your dimensions. I would expect that as long as the disc contact area on the flywheel is raised above the rest of the noncontact surface, the clutch system will work fine. I’m sure you know that the launches with this flywheel will take some getting used to. My guess is you will be fine.
Your best choice in my opinion is to talk with the flywheel manufacture with your dimensions. I would expect that as long as the disc contact area on the flywheel is raised above the rest of the noncontact surface, the clutch system will work fine. I’m sure you know that the launches with this flywheel will take some getting used to. My guess is you will be fine.
Thanks Eric,
It is raised so I am sure you are right. I sent the question to tech at CF too and am waiting on their response. The FW manufacturer said I am good to go, but it never hurts to be over cautious
Take care
Thread Starter
Racer
Joined: May 2007
Posts: 407
Likes: 0
From: San Antonio Texas
Got this response from Centerforce:
I would not recommend using a flywheel in which the friction material overhangs the friction surface. I would recommend using a smaller clutch assembly with a smaller disc or a different flywheel manufacture with a larger friction surface.
AND I also asked him if ARP bolts will interfere and it looks like they will.
The flywheel surface needs to be flat for a LS1 Application, no step. The problem we found with the A.R.P. bolts is, we are supplying a different style of spring pack in the clutch disc and if the A.R.P. bolt is used the head of the bolt is taller that the factory LS1 stock flywheel to crank bolts which results in the spring pack of the disc interfering with the head of the A.R.P. bolt.
Looks like I am going to just have my stock flywheel resurfaced and balanced......
I would not recommend using a flywheel in which the friction material overhangs the friction surface. I would recommend using a smaller clutch assembly with a smaller disc or a different flywheel manufacture with a larger friction surface.
AND I also asked him if ARP bolts will interfere and it looks like they will.
The flywheel surface needs to be flat for a LS1 Application, no step. The problem we found with the A.R.P. bolts is, we are supplying a different style of spring pack in the clutch disc and if the A.R.P. bolt is used the head of the bolt is taller that the factory LS1 stock flywheel to crank bolts which results in the spring pack of the disc interfering with the head of the A.R.P. bolt.
Looks like I am going to just have my stock flywheel resurfaced and balanced......
Tech Contributor
Joined: Jan 2007
Posts: 19,511
Likes: 1,186
From: Dyer, IN
Got this response from Centerforce:
I would not recommend using a flywheel in which the friction material overhangs the friction surface. I would recommend using a smaller clutch assembly with a smaller disc or a different flywheel manufacture with a larger friction surface.
AND I also asked him if ARP bolts will interfere and it looks like they will.
The flywheel surface needs to be flat for a LS1 Application, no step. The problem we found with the A.R.P. bolts is, we are supplying a different style of spring pack in the clutch disc and if the A.R.P. bolt is used the head of the bolt is taller that the factory LS1 stock flywheel to crank bolts which results in the spring pack of the disc interfering with the head of the A.R.P. bolt.
Looks like I am going to just have my stock flywheel resurfaced and balanced......
I would not recommend using a flywheel in which the friction material overhangs the friction surface. I would recommend using a smaller clutch assembly with a smaller disc or a different flywheel manufacture with a larger friction surface.
AND I also asked him if ARP bolts will interfere and it looks like they will.
The flywheel surface needs to be flat for a LS1 Application, no step. The problem we found with the A.R.P. bolts is, we are supplying a different style of spring pack in the clutch disc and if the A.R.P. bolt is used the head of the bolt is taller that the factory LS1 stock flywheel to crank bolts which results in the spring pack of the disc interfering with the head of the A.R.P. bolt.
Looks like I am going to just have my stock flywheel resurfaced and balanced......
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
It sounds like you have your plans set. I measured a stock disc and the diameter is 11.69 inches. Sound like the disc you have is larger than a stock unit.
As far as the spring pack hitting the bolts, they must be using larger diameter springs for the pack than stock as well. Personally I would just use NEW stock flywheel bolts.
As far as the spring pack hitting the bolts, they must be using larger diameter springs for the pack than stock as well. Personally I would just use NEW stock flywheel bolts.
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Thread Starter
Racer
Joined: May 2007
Posts: 407
Likes: 0
From: San Antonio Texas
Thats a great question. I dont have a flywheel to measure, but know someone that might. Other threads I read show the clutch fits the stock FW, but they dont give any size. All I would be worried about is the point when the friction material on the disk wears down over time and the lip on the outside of the disk eventually begins to wear on the material outside of the face. Its a tiny area (0.0625") beyond the entire border of the FW friction surface. I am not sure it would make any difference or if I would even notice it when/if it got to that point since it such a small area compared to the rest of the clutch.
Thread Starter
Racer
Joined: May 2007
Posts: 407
Likes: 0
From: San Antonio Texas
It sounds like you have your plans set. I measured a stock disc and the diameter is 11.69 inches. Sound like the disc you have is larger than a stock unit.
As far as the spring pack hitting the bolts, they must be using larger diameter springs for the pack than stock as well. Personally I would just use NEW stock flywheel bolts.
As far as the spring pack hitting the bolts, they must be using larger diameter springs for the pack than stock as well. Personally I would just use NEW stock flywheel bolts.
I just sent that measurement to CF for their input. Is the surface area on the stocck flywheel raised or is it level with the surrounding FW material?
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
The Stock flywheel contact area is all one plane, if I remember correctly, has no step. I don’t have one on hand to look at.
One other item you may already know about, but be sure to check the flywheel outer diameter for any added weights in any of the many through holes just inside of the ring gear. If you are going to replace it or have it re-surfaced, you will want to have the new unit matched or transfer the weight to the new unit.
One other item you may already know about, but be sure to check the flywheel outer diameter for any added weights in any of the many through holes just inside of the ring gear. If you are going to replace it or have it re-surfaced, you will want to have the new unit matched or transfer the weight to the new unit.
Thread Starter
Racer
Joined: May 2007
Posts: 407
Likes: 0
From: San Antonio Texas
The Stock flywheel contact area is all one plane, if I remember correctly, has no step. I don’t have one on hand to look at.
One other item you may already know about, but be sure to check the flywheel outer diameter for any added weights in any of the many through holes just inside of the ring gear. If you are going to replace it or have it re-surfaced, you will want to have the new unit matched or transfer the weight to the new unit.
One other item you may already know about, but be sure to check the flywheel outer diameter for any added weights in any of the many through holes just inside of the ring gear. If you are going to replace it or have it re-surfaced, you will want to have the new unit matched or transfer the weight to the new unit.
Thanks! I am 99% sure I will be sending the flywheel back. There is a 25% restocking fee though
. I will just have the stock flywheel resurfaced and balanced with the clutch. It seems like that is the way to go for me right now. At least the money I get bacck will pay for a new slave
Thanks for aall the help!
