MA6 heavy duty clutch

[Clem Z.]

Re: L88 Clutch use a single disk

with the lining bonded to thin aluminum and then rivited together. the reason i know this is that my 68 Z-28 kept throwing the lining off of the clutch disk because of the 8000 rpm power shifts so bill howell at GM set me up with the L-88 clutch disk. i have no idea why GM came out with that dual disk clutch setup because it just added weight to the rotating assy and made for slow acceleration and more work for the tranny synchronizers

[Clem Z.]

the L-88 clutch disk also had

a better cushion hub setup to prevent the stops from bottoming out and causing the trans input shaft to break. we had this happen several times before we saw where the cushion hub on non L-88 disk were hitting the "stop" and putting a shock to the trans input shaft. this was on a 500+ cu in all aluminum dirt track engines with a heavy car. we were on the pole at a big at that time $10,000 to win race in west va. the first time this happened.

[Clem Z.]

the L-88 clutch disk also had

a better cushion hub setup to prevent the stops from bottoming out and causing the trans input shaft to break. we had this happen several times before we saw where the cushion hub on non L-88 disk were hitting the "stop" and putting a shock to the trans input shaft. this was on a 500+ cu in all aluminum dirt track engines with a heavy car. we were on the pole at a big at that time $10,000 to win race in west va. the first time this happened.

[Duke W.]

Re: dual disk clutch

A multiple disk clutch does not need as much clamping force for a given torque capacity, so the dual disk clutch was probably designed primarily to reduce pedal effort and was primarily a street clutch, not a racing clutch.

Modern racing clutches are multidisk, but are very small - say 7" in diameter and use a similarly sized flywheel, all to reduce rotational inertia.

Duke

[Duke W.]

Re: dual disk clutch

A multiple disk clutch does not need as much clamping force for a given torque capacity, so the dual disk clutch was probably designed primarily to reduce pedal effort and was primarily a street clutch, not a racing clutch.

Modern racing clutches are multidisk, but are very small - say 7" in diameter and use a similarly sized flywheel, all to reduce rotational inertia.

Duke

[Clem Z.]

duke they are down to 5" diameter now

and they use a revese mounted starter with the ring gear on the pressue plate to farther reduce rotational inertia. i have one that uses a cone type clutch that you engage by pushing in the clutch to get rolling and when you release the clutch it engages a dog type clutch for direct drive. simple but effective to reduce the rotational inertia as the whole thing weighs only several pounds.

[Clem Z.]

duke they are down to 5" diameter now

and they use a revese mounted starter with the ring gear on the pressue plate to farther reduce rotational inertia. i have one that uses a cone type clutch that you engage by pushing in the clutch to get rolling and when you release the clutch it engages a dog type clutch for direct drive. simple but effective to reduce the rotational inertia as the whole thing weighs only several pounds.

[Mike Cobine]

Re: the L-88 clutch disk also had

You'd have loved my triple disk. It had no cushions, a solid hub. When you let the clutch out, you were either engaged or disengaged. There was no middle ground.

Imagine an on/off switch with 600 hp in front.

Imagine that with a 3.08 rear.

[Mike Cobine]

Re: the L-88 clutch disk also had

You'd have loved my triple disk. It had no cushions, a solid hub. When you let the clutch out, you were either engaged or disengaged. There was no middle ground.

Imagine an on/off switch with 600 hp in front.

Imagine that with a 3.08 rear.

[Clem Z.]

Re: the L-88 clutch disk also had

all the triple disks are solid hub because there is no room for the cushion.

[Clem Z.]

Re: the L-88 clutch disk also had

all the triple disks are solid hub because there is no room for the cushion.

[Mike Cobine]

Re: the L-88 clutch disk also had

Wasn't any room for the throwout bearing, either. I had to add a 1/8 space with the block plate in place to keep the clutch engaged. And that was the short throwout.

[Mike Cobine]

Re: the L-88 clutch disk also had

Wasn't any room for the throwout bearing, either. I had to add a 1/8 space with the block plate in place to keep the clutch engaged. And that was the short throwout.