True the MC pully is lighter than the weight of a MCS Pully.

Still this is Rotating Mass. And 1 ounce of rotating mass is like 4 ounces of non-rotating mass.

 

Agreed, but my original statement stands. The effect is more noticeable in an MCS

 

Why, cause more people have done it MCS vs. MC? Or have you experienced the difference in actuality?

 

I personally wouldn't waste the $$$ on parts and labor for a lightened 0% crank pulley; it could be better spent elsewhere or saving up.

 

It that is addressed at me than it's simple logic. Saving 6 lbs of rotating mass will have a greater noticeable effect that saving 1.5 lbs of rotating mass. I don't think I actually need to install anything for that to make sense.

 

they're not warrentying your engine against cracks just the pulley they're sending you .don't get me wrong i've purchased from webb and i'm very happy with the products but the lack of dampening may effect the block in time. maybe there are lighter flywheels out there to put on instead .

 

Ah, so you have no experience. I don't disagree with the mass logic, but see, mods affect the two cars quite differently. With the MC, saving a bit of weight could lead to big gains.

 

Actually we do warranty any faults that are directly caused by our part if your car is under the factory warranty - check out the warranty here.

Hope that helps!
Randy

 

I, for one, am a huge proponent for using the lightened crank pulley. I am using the 0% Alta one currently and couldn't be happier. The engine revs much more freely and it doesn't seem to have had any negative side effects. I've been running the pulley for over 10k miles and haven't had one concern over it affecting the life of the engine. As a matter of fact, I took it up to another level and bought the M7 lightened flywheel and I'm amazed at how quickly my car responds to throttle input. Even with the lighter crank pulley, the reduction in mass of the flywheel made HUGE changes in drivability. The car reacts so quickly that I'm finally able to execute perfect double-clutch downshifts without having to wait for the engine to respond and get to the correct RPM. It is definitely a recommended upgrade if you plan on ever replacing your clutch or getting any work done that requires the removal of the transmission. As a side note, you might want to get the work done professionally, as it took me two grueling days to do the install myself and it's something I would highly consider just paying someone to do. Unless you're a gear nut, then more power to you!

GotMINI

 

Speaking of the install on this part, is there a HOW-TO posted somewhere on this, (hopefully with lots of pictures)?

It sounds like a great mod, depending on how easy or hard it is to install.

 

There have been many requests for install pictures, videos, parties, etc. If any of the above do exist I haven't seen them, but the process of installation is not that difficult but certainly not like changing tires or plugs. I, and several others have added our thoughts to an installation thread of the crank pulley. Do a search and you will find quite a bit.
If you don't have a factory Bentley manual - get one. That should be your first step toward pulley install nirvana.

Paul

 

Khuevo was kind enough to do the Crank Pulley install in my MINI, while I took pictures and took notes. I had a 15% Alta and put the +3% oversized crank pulley. The idea was to write a DYI for this installation. But, I have been very busy traveling due to work. I need to get some time to do the write up and find somebody who wants to host the pictures in the write up. With the right tools (OEM) and a second person helping with the brake, this takes about 2 hours to do at a nice pace. It is not that difficult, but attention to detail is the key. Khuevo was telling me how much easier it was to do my car than his own, when he did not had the help for the brake. I kept wondering why it seem to be so easy, that I was worried that something was going wrong. My MINI is now just great. For the first time, I feel OK with using the AC and not feeling like the MINI has the brake on, in terms of performance. I hope to post it soon.

Cuernos Largos

 

Ok, so you have no expeience either?

 

I've had the 15% SC pulley for 2 years and the 2% crank pulley for a year now. I really loved how the 2% allowed the engine to spool up so much faster, not to mention the small increase in boost. I really enjoy this mod as much as the sc pulley... it made a wonderful change in the driveability day to day.

Oh yes... and Randy Webb installed mine.

 

My first impression is that there are significant improvements from -15% to -15% +3%. The question is how much of that is from boost gain vs. mass reduction. You would know the answer only if you did -15%, then -15%+0% and finally 15% +3%. I am not going through the problem, but somebody here has surely done it.

The biggest gain would come from the percentage increase in the crank pulley, since that is increasing boost, fact.

The one thing that weight reduction gives you, without a doubt, is the better drivebility. The car runs so much smoother from stop and Revs up quicker. There is some more engine vibration. But, I do have the engine damper, so that is expected.

I would not go back.

Bomboasy

 

i was looking at your "out of warranty " part which most modders are. you're covering the part . it doesn't bother me any cause i would expect nothing more. who's gonna warranty a block cause a guy took his harmonic off ? cmon!

 

I was curious, so I made an attempt to come up with the math to determine how much overdrive you get with different SC and Crank Pulley sizes. This is what I came up with:

The Increase in Rotational speed of the SC Pulley =((1+Y)/(1-X))-1 where X=SC Reduction in decimal (15%=0.15) and Y=Crank increase in decimal (2%=0.02). Given a 19% Pulley, the increase would be ((1+0)/(1-0.19))-1=0.2346 or 23.46% and a 17% reduction with a 2% Crank would be ((1+0.02)/(1-0.17))-1=22.89% for a difference of 0.57%.

Here is the Proof (Click to enlarge):

 

I believe there are several different versions of these calculations. The last one I remember being posted is this one (just results): https://www.northamericanmotoring.co...5&postcount=16

There are probably others before. I'll let you guys figure out which one is the correct one. I'm 10 years removed from my Dynamics and Engineering courses, have awful memory, and I haven't calculated anything similar since