Hello, I have a MCS 2005 with a pulley Sc 15% and I will like to assemble a cranck pulley 2%. Can you tell me the risk compared to the other accessories on the belt (motor air-conditioning, alternator...)
Thank

 

Welcome to NAM Bonsai. Here you will find tons of information on any and all things MINI. But it all requires alot of reading when it comes to product research. Please check out the links below to learn more about the crank pulley.

http://store.webbmotorsports.com/for...opic.php?t=707
https://www.northamericanmotoring.co...archid=1001864

 

I read already much but I am French and I have a little evil. I seek to know the incidence of the modification of the diameter of the crank pulley about the other accessories. I saw that Alta proposes a pulley alternator but for the clim?

 

I see you have installed the minipowerprog - how is it working out?

 

A lot has been written about the good and bad aspects of the lightweight Alta pulley. The forum has a search function which will locate the information. Mine causes a little roughness and vibration at low rpm. Higher RPm is never an issue. There are a lot of opinions on this mod.

 

Here is the url for a loooong thread on the topic with a lot of personal attacks:
https://www.northamericanmotoring.co...ad.php?t=54503

All of the aftermarket pulleys currently available are "undamped":

If I can summarize the discussion briefly, there are two sides to the issue:

- One side is that of the SAE and every auto manufacturer in the world - that an undamped crankshaft pulley will drastically shorten the life of your engine. Every auto manufacturer in the world uses "damped" crankshaft pulleys, to extend the life of their engines and transmissions, despite the extra cost of doing so.

- The other side is that of the aftermarket manufacturers, distributors, and purchasers of undamped pulleys - which can be summarized as "well, my engine hasn't come apart (yet)."

You judge the risk - you can believe the zealots who revere Alta and Randy Webb, or the majority of the auto engineers in the world. You place your bet and you take your chances...

 

that is one thing i had to agree with OldRick, I am not looking at the crank pulley idea very well

 

I did the 2% Crank Pulley about 2 months ago and the car revs quicker and runs awesome.

 

The ONLY reason auto manufacturers use damped crank pullies is to allow for more differences in tolerances, which actually SAVES them money because the engine on the edge of the tolerances will last through the warranty period. They're not replacing engines as much.

 

You judge the risk - you can believe the zealots who revere Alta and Randy Webb, or the majority of the auto engineers in the world. You place your bet and you take your chances...[/quote]

I'll go with Randy ANY day over the manufactures. Mini cannot even produce even HALF the ECU that the aftermarket guys do. Same goes for the pulley's too IMO.

My motto is, you only live once, so, might as well do as you please with mods and not worry about what COULD happen to your engine 200K miles later, especially considering, NOONE has had any problems with the pulley as of yet.

 

First - I appreciate my zealots - and I worked hard to gain their respect!

Second - not anywhere near every manufacturer uses a damped crankshaft pulley.

Third - we did much more than placed a bet and took chances, and despite the pressure from everywhere to release our data early, we spent just about a year testing at the track, on the dyno and on the street. We also used more than one car, in other words, several set ups. We checked endplay before and after. We also talked with part of the design team on the Tritec (the engine under discussion). We finally gleaned info from the Neon community - who have been around quite a bit longer and have similar motors (none of which have had early catastrophic engine failures by the way). I'm sure I did more as well, but that's enough to make a point.

Fourth - we now have a fleet of cars running this set up on the track and the street - SteveS is the only one who has felt anything (I drove the car) as a result.

OldRick, I can appreciate your input and opinion, but please refrain from sarcasm directed toward me - I try to treat everyone on the board with respect.

Thanks!
Randy

 

Randy,

Maybe I can track you down here. If you have a chance please reply to recent posts on the WMS forum and your PM's.

Hope to see you in L.A. in April.

 

i do not want to start a heated discussion here, but that is his attitude and i call it irritating than sarcastic, Randy

 

We also were against the Lightened crank pully at first. After several discussions with a variety of knowledgable people at SEMA this year and some followup up investigation we decided to offer our own. I have had one on my car for awhile now with no ill effects whatsoever. We have also sold over 30 to date and our coustomers have had no problems either . I will be the first to say this is not conclusive but it is all positive so far.

Randy
M7 Tuning

 

bear in mind that a major parameter in the factory design is "comfort." To that end, you get the soft motor mounts, soft suspension bushings, soft shocks, soft swaybars, noise reducing intake tube, restrictive but quiet intake path, vibration damped pulley, 50lb wheels. Probably would run longer as well.
now in comes the enthusiast...

 

Old Rick is correct when he states a lightened pulley will cause some vibration.Vibration is and will shorten engine life.How much it will be reduced depends on the amout of vibration and how and how much its driven.Me personally i love mods,but feel this one is not worth it.Thats me,i have friends who have and told me they don't care,so be it.

 

For some reason im sitting at work and thinking i want more power, and then i remember seeing this thread. So now the crank pully is on my mind.

 

I am sitting at my desk thinking the same thing! I have a 04 JCW and to have 8 more HP with 4 pounds of tourqe sounds great to me and it cheap! But I worry about the vibration damper as well!!

 

BTW I've corresponded with Randy apologized for any offense given, and discussed my issues with a few of the products he sells.

 

You sure about that statement? A reasonably balanced pulley, regardless of weight, will not CAUSE vibration. That's like saying lighter weight wheels will CAUSE vibration.

Anyway... this same pissing match has been going on for years and years on car forums - and noone's yet to provide any facts either way. File this along with the "which oil is best" threads.

 

Actually, the vibration comes from the attached accessories creating periodic vibration through the belt to the pulley.

Not having any damping on a pulley transmits these vibrations (from the SC, for example) directly to the crankshaft, where it can cause the crankshaft to resonate against its bearings, causing long-term damage.

I agree that it's not worth pursuing any further: those who believe in magic instead of engineering will continue to buy these undamped pulleys no matter what evidence is presented.

 

right... and those who believe engineering has ceased and damped crank pulleys will be needed forever and always will never buy these lightweight crank pulleys.

I'll stay on the fence a while longer.

 

pilo racing carrys a damped crank pully, atleast i remember seeing it on their site. and so far they are the only ones that carry it

 

Mine goes on this week(0% Alta).

Give me one person who has had an issue.

Anyone?

I have seen this same post on several sites for several different cars, never have I seen anyone say that their engine was damaged because of one.

Craig

 

The theory behind the lightened crank pulley is that it reduces drivetrain loss, right? The crank hp remains the same, but whp goes up, no?