Evo Clutch.....
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,028
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From: Poolville
Evo Clutch.....
I posted this in the Trans/primary drive section with no response and was wondering what you guys might think of this attempt to more clutch disengagement...
On my 98 Evo clutch I never could get more than .068" travel as measured at the release plate in the clutch basket with a dial indicator. I believe the FSM calls for .080".
The total movement allowable at the ramp is .122" which is limited by the amount the clutch lever action. So with that in mind I am trying to figure a way to get more ramp expansion with the limited amount of clutch lever travel that cannot be changed. I tried a 21* ramp as compared to the stock 18* ramp and there was no significant change. So I disassembled the ramp and took a look at the design and to me the ball bearings look small for the size of the notches in the ramps.
So I'm thinking if I increase the diameter of the ball bearing this would aide in increasing the amount of ramping with the same about of clutch lever travel.... The stock ball bearing measure .375". A larger bearing of 10mm or .394" would have a larger circumference which should make the ramp move the same distance with less pull...
I ordered them yesterday and hopefully I'll be able to get it all together on Sunday and make the same measurement with my dial indicator... Me goal is reaching .080" travel at the clutch release plate... What do you guys think....? thanx all......
On my 98 Evo clutch I never could get more than .068" travel as measured at the release plate in the clutch basket with a dial indicator. I believe the FSM calls for .080".
The total movement allowable at the ramp is .122" which is limited by the amount the clutch lever action. So with that in mind I am trying to figure a way to get more ramp expansion with the limited amount of clutch lever travel that cannot be changed. I tried a 21* ramp as compared to the stock 18* ramp and there was no significant change. So I disassembled the ramp and took a look at the design and to me the ball bearings look small for the size of the notches in the ramps.
So I'm thinking if I increase the diameter of the ball bearing this would aide in increasing the amount of ramping with the same about of clutch lever travel.... The stock ball bearing measure .375". A larger bearing of 10mm or .394" would have a larger circumference which should make the ramp move the same distance with less pull...
I ordered them yesterday and hopefully I'll be able to get it all together on Sunday and make the same measurement with my dial indicator... Me goal is reaching .080" travel at the clutch release plate... What do you guys think....? thanx all......
Seasoned HDF Member
Joined: Aug 2007
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From: NW AR
I think it's worth a try. You have the slack out of the system? The hinge pin in the lever is in good shape and not adding slack? Pulling the lever results in the clutch action starting without undo slack anywhere? No one has put one of those EZ clutch things in, right?
Seasoned HDF Member
Joined: Jan 2015
Posts: 15,947
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From: Sandy Eggo's North County
Might make the clutch pull harder. .068" separation should be enough, as long as there's nothing warped within the basket.
What is your "target" measurement? .080"? That's only 12 thousandths more. About 5 human hairs. (6 if she's a real redhead.)
Are you experiencing clutch drag now?
Got full lockup?
No slippage at WFO?
Just trying to see what your priorities are with this.
What is your "target" measurement? .080"? That's only 12 thousandths more. About 5 human hairs. (6 if she's a real redhead.)
Are you experiencing clutch drag now?
Got full lockup?
No slippage at WFO?
Just trying to see what your priorities are with this.
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,028
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From: Poolville
The hinge pin has no play and I installed new a new pin for the cable and no, no one installed an EZ setup..
Thread Starter
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,028
Likes: 7,549
From: Poolville
Might make the clutch pull harder. .068" separation should be enough, as long as there's nothing warped within the basket.
What is your "target" measurement? .080"? That's only 12 thousandths more. About 5 human hairs. (6 if she's a real redhead.)
Are you experiencing clutch drag now?
Got full lockup?
No slippage at WFO?
Just trying to see what your priorities are with this.
What is your "target" measurement? .080"? That's only 12 thousandths more. About 5 human hairs. (6 if she's a real redhead.)
Are you experiencing clutch drag now?
Got full lockup?
No slippage at WFO?
Just trying to see what your priorities are with this.
yes...
No.....
012" is a lot. It would be all the difference in smoother shifts without drag....
Dirt don't hurt
Joined: Jan 2011
Posts: 21,062
Likes: 4,547
From: Haslet Texas
How old is your clutch cable?
Could it have stretched a bit?
Not entirely sure bigger ball bearings will help as they still need to be small enough for the snap ring to be installed over the ramp plates.
FWIW I just bought a scorpion low profile lock up clutch set up for my 111" motor.
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,028
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From: Poolville
I'm guessing you replaced the OEM clutch parts to match up with your bigger motor.
How old is your clutch cable?
Could it have stretched a bit?
Not entirely sure bigger ball bearings will help as they still need to be small enough for the snap ring to be installed over the ramp plates.
FWIW I just bought a scorpion low profile lock up clutch set up for my 111" motor.
How old is your clutch cable?
Could it have stretched a bit?
Not entirely sure bigger ball bearings will help as they still need to be small enough for the snap ring to be installed over the ramp plates.
FWIW I just bought a scorpion low profile lock up clutch set up for my 111" motor.
The cable is only a few years old and any stretching would have been adjusted out if any...
Correct on the bigger ball bearings. That's why I measured everything. They will only be .022" larger in circumference which will actually fit the ramps better. The OEM seem very small as compared to the ramps.
Theoretically because of the larger circumference it will change the position of the ball in the ramp and should have more movement in the ramps with the same amount of clutch lever movement. So with that creating a little more lever travel I'm thinking I might be able to maximize the ramp separation to it designed potential... I'll know this weekend...
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Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
Having an older Evo which has always had marginal clutch-plate clearance I shall watch with interest. I adjust mine at the clutch by the book, but take out most of the cable slack. Makes me feel better, as if I've achieved a little improvement!
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Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
Same here....