M7 16%
M7 2%

28,000 miles

Hard driving, 7,000 RPMs every time I drive the car.

No problems

Bill

 

No preference to any vendor, just happen to be what was available on sale by other owners in NAM:

-15% Alta installed at 5K 2 1/2 years ago, Randy Webb did it. +3% Alta installed at 21K by Khuevo. I wrote a DYI for this installation. +5% Altanator installed at 22K by myself. No problems. No issues. Some vibration after the 3%, but not a lot more than what was there since I installed the engine damper that ties the engine to the frame. I do not race, but I drive like I stoled it sometimes.

Bomboasy

 

I've been struggling how to deal with some of the "problems" mentioned by some contributors.

For example, bomboassy states that he experienced a slight increase in vibration. While some may discount this, others may not. For this reason, I have erred on the cautious side and placed it in with the others that have had problems. I have also quoted the actual comments made by the "problematic" crank pulley instances.

 

You would have to define "with problems". Some vibration is to be expected. It will be there. Physics tells us that. No damper will result in vibration. How much is the question. I know there is some, but do not really know how much from that modification. The engine damper is bringing most of the vibration. It was there first and when the crank pulley went in, the difference was minimal if any.

I would not like to be included on the "with problems" list. I am trying to tell you that I do not know how much vibration occurs in my installation due to the Crank pulley. The vibration that I feel comes mostly if not all of it from the engine damper. I know that some vibration is expected from the light UNDAMPED crank pulley. I would not go back to stock because I have seen what happens to the old stock cranck pulleys when the rubber detaches or comes loose.

Thanks for wanting to help us see patterns, but I do not want to be part of the wrong pattern. Either take me out of the survey, or let me tell you how much vibration is there without the engine damper. I would have to take it out to find out.

Bomboasy

 

I am ready to do the PULLY ...

2 things if I may:

I need to buy , rent , borrow the tools ... ANY HELP ???

I am going to do an ALTERNATOR pully as well ... any help / how-to on that ???



THANKS ALL

 

15% supercharger pulley Alta
2% crank pulley Alta

15500 miles

so far, one problem, dealer blaming the crank pulley on a weird noise on the alternator... though they never said why... but its charging fine, battery has never ever been flat.. makes me wonder

 

I suppose that that the way I read your post was that there was incremental vibration in addition to the vibration added by your engine damper. Now to some people they would understand the vibration added by the engine damper, but would find probable worry to have vibration from the crank pulley as it would mean that it is causing extra vibration to the crank and thus extra vibrations throughout the engine block. I can understand if you don't find this a problem, but some people may. That is why I have posted each person's "problem" on the first post so each person can judge for themselves whether it matters to the person and they don't have to look very far.

In addition, one shouldn't put too much weight on the table as it doesn't really mean very much. What's more important is the anecdotal evidence below the table. For example, Cor Blmy has probably seen the very first post and judged for himself that he doesn't really care if the crank pulley may cause problems at very high RPMs as per M7's new judgment. All people have their own standards and all I have done is laid it out for them to decide for themselves. I hope that makes sense.

 

Its been alittle over a year from when this thread has started. Is everybody still happy with there crank pulley? Has there been any new issues that occured?

 

A blast from the past. I still have my 3% crank pulley. You and I have almost the same mods, but I do not put too many miles in mine, do not have to, but would like to. I am at 37K in a 2003 MCS. Crazy. Not problems at all with my inspired driving.

Bomboasy

 

Holy old thread BatMan!

But a good idea to have folks check in again!

 

Both the Alta -15% and +2% pulleys, 22K miles, no problems.

No vibration for 15K miles but then installed the Engine Damper and did notice some very minor vibration. I attribute the vibration to the damper and not the pulleys.

 

Alta 3% crank and 5% underdriven alternator pulleys
No problems, and no looking back

 

Wish I'd heard this news 2 weeks ago:
http://www.mini2.com/forum/engine-dr...ml#post3316484

 

This is good news actually . This thread is just about 2 years old now and there have been no issues reported which have been directly attributed to the lightened crank pulleys. I know of one engine failure but the car was run up to 8400 rpm and the oil pump gear gave way. We thought it MAY have been an issue but it was never fully proven. With thousands in use and hundreds of thousands of miles driven it would be safe to assume that the lightened pulley is a fairly safe bet

Randy
M7 Tuning

 

A 15%+2%, Lots of street mile, and lots of track miles. not a problem.

Chad
Detroit Tuned

 

The 16+2 combo has been great so far for 12k

 

JCW and WMS 2% coming up on 2 years, 5-6 track days, 6-7 autoX days and about 10kmi (not my daily driver) still humming along. Dealer didn't even squawk when I had the idler tensioner replaced because it was rattling!

 

I should have said above as well as my Batman comment, that we have had ZERO reports of any issues from around the world. Several thousand crank pulleys sold, so if there were an issue I SWEAR we would have seen it. I trust it enough to put it on my GP (haven't made time to do it, but will ASAP!)

I skimmed the MINI2 thread above. I am skeptical that the cars reported to have failed, can be directly linked to the crank pulley as RMW seems to have implied. (I like Jan so no poke there.) I would suspect other factors caused those failures. My point is again, there are thousands of ALTA versions and who knows how many other mfr's of similar design, that if this was an issue we ALL would have heard about it long ago.

Just my two cents.

 

103,000 miles, still track and autox. Crank pulley on for 80,000. Original supercharger.

Steve

 

The tools from the dealer to do the job are fairly pricey - can anyone recommend discounted sourcing or rental options?

 

I have since switched to a 06 crank Pulley and a 15% and the car is much happier... the M62 is off the car with an 06 SC

 

Have both Alta 15%and 2% on my 05,plus 20,500 miles.No problems what so ever,Q

 

I have seen the responses, but it looks like all of the pulleys being used are either alta, or m7. Does anyone one have any experience with the one that minimania sells? I got one super cheap, but I wanted some info before I put it on. Thanks

http://new.minimania.com/web/item/NM.../InvDetail.cfm

 

I've been wondering about that too...

 

04 JCW MCS with 3% GTT crank pulley. No vibration issues. No other problems. Nice pulley - a stainless steel sleeve is heated up and fitted on the crank nose, interference fit when cooled down so no possibility of slipping. The balanced aluminium crack pulley bolts down on the sleeve mith M5 cap screws and the same center bolt as used with the stock CP. The belt tracks perfectly true. Very satisfied. Also visiting the redline often, however with the engine spooling up quicker I found it less necessary to rev the daylights out of the engine. It also got rid of a common JCW flat spot, "dip in the proceedings" around 3000-3500 rpm as the engine accelerates through this range quicker. There are photos of this pulley on GTT Tuning's website