Resolution for broken KW C38 blower pulley bolt that breaks?
Thread Starter
Joined: Dec 2007
Posts: 4,757
Likes: 120
From: Waukesha, WI
Resolution for broken KW C38 blower pulley bolt that breaks?
Hello all,
My friend and I are in the middle of installing the new KW C38-91 blower kit onto his S2000. I have seen a lot of threads about the blower pulley adapter bolt snapping in half. I was wondering what the resolution is to this issue. Are people settling for a warranty repair through KW/Rotrex? Are people upgrading these bolts?
As far as the kit goes, I plan to do a thread about it, but for now Id like to focus on this bolt and how to address the issue.
This is the bolt I am referring to:
(Pictures from "The Machine")
My friend and I are in the middle of installing the new KW C38-91 blower kit onto his S2000. I have seen a lot of threads about the blower pulley adapter bolt snapping in half. I was wondering what the resolution is to this issue. Are people settling for a warranty repair through KW/Rotrex? Are people upgrading these bolts?
As far as the kit goes, I plan to do a thread about it, but for now Id like to focus on this bolt and how to address the issue.
This is the bolt I am referring to:
(Pictures from "The Machine")
Joined: May 2007
Posts: 5,491
Likes: 12
i will do it if no one has post a picture before i receive my kit. maybe a week maybe longer.
Joined: Oct 2012
Posts: 1,115
Likes: 7
Looks like a socket head cap screw with a class 8.8 wonder if they would upgrade to a 12.9
Joined: Apr 2003
Posts: 3,244
Likes: 4
From: Northern KY
Originally Posted by Habitforming' timestamp='1435215185' post='23659863
It would be great if someone could get a good pic of the head of the bolt, one of you that has a kit you haven't installed yet... we should be able to determine what grade it is.
Now I'm wondering if I happened to catch a pic of it when I did my install... time to go digging
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Joined: May 2007
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hi rain H&R i Brake 3 bolts in 5 month... now i have the car in the shop we are working on a cnc port head , custom intake manifold and cams.... and also we are building a new custom Billet forged bolt .. i will upload pics in a few days of the bolt and the other parts in my topic. since this bolts brake when you hit the rev limiter a lot and oversping the blower... i look for the arp bolts but they dont have the head alem that use the pulley from KW. 
he or anyone els never mentioned any of these.
3 bolt in 5 months.
now i started to get nervous, i just placed the order for 91 blower n i5mm pulley.
Joined: Oct 2012
Posts: 1,115
Likes: 7
Originally Posted by jojobrown' timestamp='1435255525' post='23660469
[quote name='Habitforming' timestamp='1435215185' post='23659863']
It would be great if someone could get a good pic of the head of the bolt, one of you that has a kit you haven't installed yet... we should be able to determine what grade it is.
It would be great if someone could get a good pic of the head of the bolt, one of you that has a kit you haven't installed yet... we should be able to determine what grade it is.
Now I'm wondering if I happened to catch a pic of it when I did my install... time to go digging
[/quote]
I am just referring to the picture above, I am still on the fence for the kit at the moment and don't want to pull the trigger because of this. One of the main concerns is that if you open the blower and replace the bolt yourself you pretty much void the warranty and only way to get this repaired is sending the blower back to Rotex which will just cause more downtime for the car.
Joined: Apr 2003
Posts: 3,244
Likes: 4
From: Northern KY
You don't have to open up the blower to replace this bolt, at least I can't see any reason to need to do so. I think Nik is the only one with multiple broken bolts. Anyone else that experienced this only had it happen once, that I've seen.
I have several thousand miles on my kit and I've hit the the rev limiter several times. No broken bolts here.
I think hitting the limiter a bunch, and having an aggressive limiter are big factors in this. My limiter is fairly soft (Aem v2, Evans tuned). I rarely hit it, as a rule, even before I was boosted.
I have several thousand miles on my kit and I've hit the the rev limiter several times. No broken bolts here.
I think hitting the limiter a bunch, and having an aggressive limiter are big factors in this. My limiter is fairly soft (Aem v2, Evans tuned). I rarely hit it, as a rule, even before I was boosted.