Exedy clutch
For those that have a 4g94 engine. Exedy have a clutch kit listed as MBK-7229. This kit have a MUCH lighter duty clutch disc and might not last long (at least not as long as the original) worse if you do some 4x4.
I am getting the clutch done by a friend that have a workshop and he contacted me as he didn't want to fit the Exedy clutch While this kit should fit the friction material is about 30 % less than the original clutch disc and the spring are 1/2 the size !
Several clutch manufacturer have been contacted but only one seems to have something that look like the original fitting. I haven't received the new clutch yet but it is made by Clutch Pro (I think). I haven't find much about them on the web, apparently made in Victoria.
The problem with that type of parts is if you get it done somewhere, and if they don't care...you end up with a much lighter duty clutch without knowing
I will post some pictures later.
Happy io
Exedy clutch
OK, I have bought the Exedy clutch and contacted several other clutch maker. Most, but one, have the same light duty clutch disc with their kit. This disc clutch should be fine for every day 2WD but I, and every one that saw it, doubt that it is suitable for heavier 4x4.
All said, I am not an engineer working for a clutch company....
The only people, that I found at least, that make a suitable clutch is Xtreme Clutch, kit ref KM1 220212-1A. This kit is classified as the heavier duty for the io. It is normally listed for the 1.8 litre but fitted my 2 litre io. The kit is what Glen found and the pictures of it are just above. The friction contact is a touch smaller, the spring seems stronger, overall a much better match than the Exedy.
Exedy clutch costed $180, Xtreme clutch kit costed $485.
Here is a picture of my old disc clutch and the Exedy one. Please note that my clutch was only replaced because I am going to the Simpson desert, not because it was faulty or worn out.
Much smaller friction contact and smaller spring. Old one on the left, new Exedy on the right.
If I have any problem with this kit, I will let you know...unless I am drying in the Simpson desert !!
Happy io
don't worry
the narrower friction material increases the clamping pressure andtorque transfer:
the torque transfer relationship between friction and perpendicular coupling is based on the median friction point, i.e. the average radius of the friction material.
while decreasing the fricton material conact patch seems like it is worse, in most cases a small reduction of suface area INCREASES the clamp due to th PSI increasing (same pressure, less surface area) tip this too far and the net friction drops off due to simply not enough contact patch and makes the situation worse.
With a smaller friction pad the median radius (mid point between inside of fricton pad and outside edge of friction pad) can be effectivly moved outward, this presents an advantage like a lever, further the radius, more advatage, more torque transfer.
balancing the increased torque and clamping pressure with less area is difficult but exeedy have experience I trust. makes for better lighter clutches that don't last as long, but mine was still good at 225,000kms so my new one should see me beyond my io's lifespan.
true but
You wrote: "in most cases a small reduction of surface area INCREASES the clamp due to th PSI increasing (same pressure, less surface area..."
You are 100% and this is exactly why the workshop didn't want to fit it.
First this is not a "small" reduction but a lot of it ! For me "same pressure, less surface area" equal to more heat then overheating then burn the clutch. This increase with the load. When you tow a heavy trailer or have to stop in the middle of a steep climb and have to start again, you may have to "play" with the clutch to move. How many time did you smell burn clutch by doing this or similar....it will happen even more with this light duty clutch.
Now, I also agree that the smaller friction increase the clamp, if you have a big load by again...towing a big trailer or doing that steep hill start up (yes you should do it without touching the clutch in low gear...but not always possible, lets not go there !), if you have more "torque transfer" you put more stress on the gearbox and the rest. The spring inside the clutch disc are to help protecting the gearbox by dampening the shock of the clutch engaging. If their designed the clutch disc to give more torque, so more stress to the gearbox, why did they fit smaller spring ? these spring will fail quickly....
For the warranty, will it work if you return a burn out clutch ? maybe not....
The car will not fall apart from fitting the Exedy clutch, but the clutch will not last. I think that they are trying to save money, and betting that these little io don't get out of the black top too often, and they are right, but if you do...you might take a big gamble with their kit.
Again, I am not an engineer, I just thought that it should be mentioned as this is a BIG difference between what Exedy offer and the original fitting. If think that this disc clutch is bad but I have been wrong many time before...ask my wife !!!
Happy io....one month to go before going to the Simpson:)
Where did you get your
Where did you get your clutch? Price is a little steep. Mine was just over $300.
I have tried many clutches on my race car. I ran a button clutch, held ok but was harsh with no ability to slip. swaped to a larger diameter and got more holding ability as well as the ability to not stall when taking off from the lights. Was tempted to run a tiny multi plate tilton clutch as some of my mates have done. But it is just an on / off switch once i do that :)
I agree with your logic of wanting more surface area to give your car better ability to slip the clutch. we abuse them a lot this way off road. Im sure Bobs correct that the exeedy will see him through the rest of his iOs life just fine too.
Im planing to start a turbo build at the end of this year or next year. Ill be needing something that can hold a little more torque yet hopefully be nice off road.
pajero io clutch
I got the clutch kit from Autopro Fyshwick, I usually get a good price....maybe I looked desperate to get my car back on the road :)
Maybe Bob's will outlast my clutch, size is one thing, quality is another and Exedy have been around for a while.... My idea was mainly to point the difference, and find a similar looking clutch as my original one.
Happy io....
Syndicate
Yes pics would be good!. Ill
Yes pics would be good!.
Ill post some pics of my xtreme clutch latter today for comparison.
Yippy i-O
31s 245/75/16 BFGs(33s next) 5" lift Coilovers with 290mm stroke. - 5.29 diffs with Kaiser Lockers.