15% Alta supercharger pulley: about 20,000 miles, ZERO problems

2% Alta Crank Pulley: about 9000 miles, again, ZERO problems

the pulley has been pushed, the crank pulley tops have been taken to about 6.5k, but not much more

 

Oh Snap! I am telling you it is easy. Pull the passenger front wheel off, pull the wheel liner. Un-tension the belt (with Barney's tool) remove lock bolt. Heat pulley up to expand it (as it is press fit). It will slide off. Place new pulley on. Torque down. replace belt. Test drive and enjoy.

 

Cool, thanks I think I'll have to get one on order

 

Alta 15% SC Pulley
Alta +2% Crank Pulley
3K miles & 0 problems

 

those running crank pulleys - what redline are u guys running? 7200? 6900? etc - also do u drive it to the redline much at all? just think this would be abit more informative.. i mean having a 15/2 or 19/0 setup, driving xxxxx miles, and never really driving it hard doesnt say much about reliability of the cranks if u get what im saying. Thanks anyhow

 

On the track I hit my rev limiter a lot more than I should. In the hills I am routinely betwen 4800 and 6500 rpm.

Randy
m7 Tuning

 

15% sc/2% crank

My rev limiter has been set at 7200 rpm. On the street I will frequently wind out to 6800-7000 in 1st and 2nd gears. HTH

 

Not having removed a pulley on the MINI, but would it be possible to have my local garage install a crank pulley without using the specific MCS belt-tensioner tool? Would they need any specific specialist tools? Pardon my ignorance.

 

No ignorance and a good question. The job would be a lot easier with a proper pulley tensioning tool. Getting the pulley off and replacing it is easy but you do need to have the belt loose to do it.

Randy
M7 Tuning

 

Driven hard daily...7k shifts and plenty of cruising at 4k ready to go...

 

I'll chime in. Driven hard not infrequently and 8k redline.

 

Alta 15% 9000 miles and Alta 2% 5500 miles no problems what so ever.Q

 

Alta 15% SC Pulley 45,000 miles
Alta 0% Crank Pulley 25,00 miles
Moved up to:
Alta 2% Crank Pulley 10,000 Miles

Track and Street, no problems and no Alt. Pulley.

 

Steve, We can do this and you camber plates in an afternoon. What did you decide to do about accessing the adjustment screw on the KW's through the Helix plates?

I have some time this weekend and next Saturday (15th) if you want to get together. Maybe we can do it over at here at the April Drive speed shop as I have all the impact tools and stand we need, as well as the Bentley. We just need Barney's belt tensioner tool. Maybe he would even like to join us??

 

With a 14% problem rate at an average of 6,000 miles the risk adjusted bang-for-buck does not look so good. Are Alta, M7, and WMS still recommending the crank pulley? I know Dinan and some L.A. MINI tuners don't recommend it.

 

Alta 15% - 9000 miles no problem
stock crank pulley

 

Can you really say 14% yet? I am sure this is well under a good sampling of the number of crank pulleys installed. And like anything, if you have had problems you are more likely to speak up and more likely to have found your way to NAM looking for solutions (known as sampling error in the statistics world)

Brian or Randy can you pipe up as to how many crank pulleys you have done now and how many problems you have seen??

What about M7, how many have you guys sold or installed?

Alta? how many have you sold directly to consumers.

I think we don't have a full denominator in this calculation.

 

It would be good to know these stats if Alta, M7 and R.Webb could chime in- ie how many miles, redlines, hard/soft driving etc did they do through their testing?

also - did u guys have to 'run in' the crank pullies?

 

You are absolutely right. There is sampling error and the N value is low but three problems at low miles is disturbing especially compared to virtually zero problems with the 15% sc pulley. I hope the data looks better as we get more responses. Everyone with a crank pulley - PLEASE VOTE

 

I agree let see how it continues to accrue.

Ha!

Kinda like a clinical trial!

And remember, a wise man once said:
"There's lies, damn lies, and then there's statistics"

 

Hardly scientific data. For example, none of MDSBrain's vehicle problems can be blamed on the crank pulley. In fact, his entire engine was just replaced due to a fault in his engine block. Notice that the ppl that have issues have very low miles on the crank pulley? Not sure what to make of that...but it's interesting anyhow.

To answer others... I dog my car out daily. Every on-ramp, off ramp, and safe place to do so, I'm in it hard.

 

did u guys have to 'run' in ur cranks?

 

I'm not familiar with mdsbrain's problem, but could it not be that the fault was caused by the crank pulley?

On the second issue, wouldn't it be typical for a person that had a problem with a crank pulley to be low mileage. I know if I was having a problem, it'd be coming off right quick and not staying on for an additional 20,000 miles.

All the table seems to show this moment to me is that a crank pulley isn't as foolproof as some of the other mods that are available.

 

looks like the crank pulley is a bit schizophrenic. Maybe it just doesn't go well with certain engines. The people that have it with no problems love it to bits, and the people who have had problems get the problems straight away (which is good in a way). I think it's not a long term problem at all, just a trial and error thing

 

I think from our survey this simply shows that more study must be done on this part. Just that maybe more of a better How-to with a better explanation is needed.