+1. i've heard only good about this clutch. i'd be running it if i was making big power.

 

You ever look at their site? Holy expensive, batman. $3479 for the triple

 

Another vote for ATS carbon/ carbonetic triple. Smooth as glass and very light pedal effort.

It is expensive but it will outlast and outperform especially for a DD.

 

from AMS's website:

assuming that's BHP and it holds 640whp, then that would be about right for OP's goal. carbon should last forever, so it makes sense it holds up well over time. you gotta pay to play if you want crazy powa, i guess

 

my choice would be the ats non-conversion twin. maintains pull configuration with twin disk, and with 3000 lb clamp load cover, should be good for 600+ whp.

http://www.ppi-ats.com/NC-pull.html

street price is $2100, but cover is not included. any factory compatible cover will work. could use an act or other brand cover.

 

The twin is rated at 700hp with a 2425lb pressure plate. Would hold a lot with the ACT XT pressure plate. Which is 2900lbs, I think. Its still over $2500 with a pressure plate and new TOB. Almost worth it to just spend the extra money and get the full shebang with the push conversion..

 

I dont recall multiplate clutches having long service lives. Most need to get rebuilt 30k so you'd be lucky to have one last as long as a timing belt.

 

I like the pull-style because its what the crankshaft thrust bearing was designed to withstand.

 

That is a misconception, any damage related to clutch on crank thrust bearings has nothing to do with the type of clutch system used, but with specific clutch systems used of either type. Two main features that can cause damage to crank bearings and thus crankwalk i.e , are the wrong pressure plate used and the wrong distance created between clutch disks and flywheel during the disengagement-engagement sequence.





Marios

 

push and pull both put loads on thrust. just opposite sides of thrust. I like pull style clutches because they have ~25% more holding tq for a given pedal pressure. on a push style clutch the pp flexes away from clutch disc. so any flexing results in less holding power. on a pull style the pp flexes toward the disc. so there is no loss of holding power.

 

same here. i don't know anyone with a multi-plate clutch that doesn't have to constantly do something with it be it adjusting, rebuilds, etc.
they definitely aren't for me.

finally. a reason for the pull-style clutch. i could never come up with a decent reason for it.

 

Exedy twin with pivot ring upgrade. Holds plenty of TQ and drives beautifully

 

Doesn't the "pull" side of the thrust bearing have oiling grooves while the "push" side does not?

 

As I said this is a misconception. The oil grove is there not because of the way the clutch system works, but for solely lubrication reasons in relation to the rest of the rotating assembly. It is located at the "pull" side because mitsubishi chose to design the 4g63 crank bearing in this way, considering the fact that it is either the best bearing design in relation to other factors and not due to the clutch system, or just because they simply chose that side. I strongly believe that if the grooving was on the other side, it would still make no difference in lubrication. Both sides, and the whole bearing surface, no matter where the grooving was would get the same amount and quality of lubrication regardless of the type of clutch used. If what you say was the case, which is not either in theory or in practice, none of some well known clutch manufacturers would create push type clutch systems for the 4g63 nor serious 4g63 projects would use them in serious events, such as the Time Attack world tournament, hillclimbs etc. In fact it has been noticed that most crankwalk issues in general, due to the clutch system, happened and will continue to happen using the "pull" type clutch system. I personally like both systems, as long the system I use is properly designed and constructed.

The short article below explains more of what I am saying here and gives a bit of insight of how are bearings and why.



http://www.vandervell.co.uk/images/s...gPerforman.pdf









Marios

 

I just put in an Exedy Triple after 4 years on the quartermaster 6 and 8 leg clutches and I am soooo happy with how it drives. So smooth. A little noisy but it doesn't groan when you engage the clutch like the qm does. Just rattles on disengagement and driving around. Hopefully it can shift as quick as I want it to.