ROTREX C30-94 supercharger noise - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Tuning & Upgrades Discuss performance enhancements for your Alfa Romeo

Reply
 
Thread Tools
(Post Link) post #1 of 29 Old 03-09-11 Thread Starter
Status: rebuilt engine after ROTREX trouble
AO Member
 
PtiSéb's Avatar
 
Join Date: Jul 2009
Location: France
County: Paris / Ill de France
Posts: 86

Member car:

Gtv 3.0 Q2

ROTREX C30-94 supercharger noise

Hi all,

I've bought a used (25.000 miles) ROTREX C30-94 supercharger for my Gtv 3.0 V6 24v from a member here (from Poland) who told me it was in very good condition and worked properly.

The kit has just been fitted (one month ago) by my mechanic (now 333 bhp) and at cold start I have a noise that disappears when warm. My mechanic also told me it was not in so good condition and it seems in Poland they have salty roads because of snow in winter and some parts from the supercharger kit had some rusty points.

Here is a video of the noise :

http://nuvola916.free.fr/Videos/bruitcourroie2.AVI
(i already put some WD40 lubricant near accessory belt and i replaced supporter's supercharger bearings but the noise still there). Oil's level is good from rotrex radiator and oil is new.

The seller is telling me the supercharger is subject to wear ( ) and I have to send it to ROTREX (Denmark) in order to change the internal bearings... Too bad the warranty is over and ROTREX doesn't seem to fix or rebuild them...
Although it was used, i had in mind to drive my car at least a few thousand miles without any troubles...

I found a american company who rebuilds them :
Supercharger Rebuilds
The bill is 650$ including shipping charges and 500$ more if planetary rollers have to be replaced...

What do you think about this noise ? Can I drive like this (no more noise when warm) ?
Do I have to buy a new one (on ebay there are some sometimes) or only to check the noise ?

Needless and useless to say i'm angry about seller's behavior.

Thanks for any advice or feedback about ROTREX superchargers.
Cheers,
Seb.

1997 PH1 Trackday Gtv 3.0 V6 24v 1245 kg

Last edited by PtiSéb; 11-09-11 at 08:20. Reason: bad conversion
PtiSéb is offline  
Sponsored Links
Advertisement
 
Status: a good shot of nitrous will sort that!
AO Silver Member
 
jbsmith1's Avatar
 
Join Date: May 2008
Location: United Kingdom
County: Essex
Posts: 1,968
sounds like it could be one of those smaller wheels with the belt wraped round, are they water pump and belt tensioner pulleys? could be one of those that has the squeeky bearing, and the sc is fine.
Thinking about it, a worn belt can squeek like that, have you got another belt to try.
Nice hp btw.
jbsmith1 is offline  
Status: -
AO Member
 
gtv 3lturbo's Avatar
 
Join Date: Jan 2009
Location: France
County: Paris / Ill de France
Posts: 233

Member car:

gtv 3l turbo

Quote:
Originally Posted by jbsmith1 View Post
sounds like it could be one of those smaller wheels with the belt wraped round, are they water pump and belt tensioner pulleys? could be one of those that has the squeeky bearing, and the sc is fine.
Thinking about it, a worn belt can squeek like that, have you got another belt to try.
Nice hp btw.
noise from the compressor all the other rollers or belt no noise.
gtv 3lturbo is offline  
Status: a good shot of nitrous will sort that!
AO Silver Member
 
jbsmith1's Avatar
 
Join Date: May 2008
Location: United Kingdom
County: Essex
Posts: 1,968
Quote:
Originally Posted by gtv 3lturbo View Post
noise from the compressor all the other rollers or belt no noise.
yeah fair enough.

I found this clip that sounds alot worse and a propper rumble.
If your sure its coming from the sc then these things never get better only develop into an expensive fix, catch it early, and fingers crossed its just bearings.
AA SC E36 M3 - YouTube
jbsmith1 is offline  
Status: no pain, no gain
AO Silver Member
 
yan.ko's Avatar
 
Join Date: May 2010
Location: Czech Republic
County: Moravskoslezský
Posts: 1,951
Garage
Quote:
Originally Posted by jbsmith1 View Post
Eeh, sounds like coffee grinder ;-)
yan.ko is offline  
Status: a good shot of nitrous will sort that!
AO Silver Member
 
jbsmith1's Avatar
 
Join Date: May 2008
Location: United Kingdom
County: Essex
Posts: 1,968
Quote:
Originally Posted by yan.ko View Post
Eeh, sounds like coffee grinder ;-)
Exactly!! Hope this helps the op
jbsmith1 is offline  
(Post Link) post #7 of 29 Old 04-09-11 Thread Starter
Status: rebuilt engine after ROTREX trouble
AO Member
 
PtiSéb's Avatar
 
Join Date: Jul 2009
Location: France
County: Paris / Ill de France
Posts: 86

Member car:

Gtv 3.0 Q2

The accessory belt is new. And thanks god no noise like the one recorded on your video
Only occurred at cold start and it disappears when warm.
The pressure remains constant when supercharger loads, no pressure or power drop/decrease...it's OK.
Just the noise at cold start.

I would like to fix or rebuild it later.

Any ideas about this noise ?

Seb.
PtiSéb is offline  
Status: wondering what to tweak next...
AO Silver Member
 
Join Date: Sep 2007
Location: United Kingdom
County: North Yorkshire
Posts: 2,793

Member car:

Alfa 156 GTA

daft question, but is that pulley in the centre of the video on correctly? the centre of it seems to oscillate intead of just spin, look at the egg shape it's making in the centre......
aziraphale is offline  
Status: Meh.
AO Platinum Member
 
NineOneSix's Avatar
 
Join Date: Dec 2006
Location: United Kingdom
County: Hertfordshire
Posts: 30,067
Garage

Member car:

GTV V6 3.0

The centre pulley on the crank has a weight inside which is to balance with the crank, it just gives an illusion it's oscillating.
NineOneSix is offline  
Status: wondering what to tweak next...
AO Silver Member
 
Join Date: Sep 2007
Location: United Kingdom
County: North Yorkshire
Posts: 2,793

Member car:

Alfa 156 GTA

said it was a daft question :P
aziraphale is offline  
Status: Meh.
AO Platinum Member
 
NineOneSix's Avatar
 
Join Date: Dec 2006
Location: United Kingdom
County: Hertfordshire
Posts: 30,067
Garage

Member car:

GTV V6 3.0

Don't ask, never know

NineOneSix is offline  
Status: -
AO Member
 
Join Date: Oct 2001
Location: Ipoh, Malaysia
Posts: 223
PtiSéb,

Did you custom make the brackets or was the S/C sold with the brackets? I'm thinking of putting a C30-74 in a 155 3.0 24V.

Also, how was the low end power? No difference compared to N/A?

Thanks!
75evo is offline  
Status: -
AO Member
 
Join Date: Dec 2007
County: -
Posts: 53
Garage
I don't have any answers to your questions, but I do have a remark: WD40 as lubrication? It's more like a solvent..
SW_Joost is offline  
(Post Link) post #14 of 29 Old 07-09-11 Thread Starter
Status: rebuilt engine after ROTREX trouble
AO Member
 
PtiSéb's Avatar
 
Join Date: Jul 2009
Location: France
County: Paris / Ill de France
Posts: 86

Member car:

Gtv 3.0 Q2

Quote:
Originally Posted by 75evo View Post
Did you custom make the brackets or was the S/C sold with the brackets? I'm thinking of putting a C30-74 in a 155 3.0 24V. Also, how was the low end power? No difference compared to N/A? Thanks!
The custom bracket was sold with the supercharger.
here are the dyno power graphs :



PtiSéb is offline  
Status: More money !!
AO Member
 
andyt34's Avatar
 
Join Date: Mar 2008
Location: United Kingdom
County: Essex
Posts: 681

Member car:

147 GTA

I prety sure that the rotrex chargers are only good for 60k miles and then you need a new 1 as rotrex do not rebuild or recommend having them rebuilt
andyt34 is offline  
Status: -
AO Member
 
gtv 3lturbo's Avatar
 
Join Date: Jan 2009
Location: France
County: Paris / Ill de France
Posts: 233

Member car:

gtv 3l turbo

Quote:
Originally Posted by andyt34 View Post
I prety sure that the rotrex chargers are only good for 60k miles and then you need a new 1 as rotrex do not rebuild or recommend having them rebuilt
The Rotrex is not 60k miles. The noise only appears cold, we think of a lubrication problem cold.

it will be refurbished by the company: Supercharger Rebuilds

does anyone know?

cheers
gtv 3lturbo is offline  
Status: More money !!
AO Member
 
andyt34's Avatar
 
Join Date: Mar 2008
Location: United Kingdom
County: Essex
Posts: 681

Member car:

147 GTA

Quote:
Originally Posted by gtv 3lturbo View Post
The Rotrex is not 60k miles. The noise only appears cold, we think of a lubrication problem cold.

it will be refurbished by the company: Supercharger Rebuilds

does anyone know?

cheers
If you go on the rotrex site it's say the life span of the unit is 100,000km
andyt34 is offline  
Status: -
AO Member
 
gtv 3lturbo's Avatar
 
Join Date: Jan 2009
Location: France
County: Paris / Ill de France
Posts: 233

Member car:

gtv 3l turbo

Quote:
Originally Posted by andyt34 View Post
If you go on the rotrex site it's say the life span of the unit is 100,000km
his has only 40000kms.
gtv 3lturbo is offline  
Status: More money !!
AO Member
 
andyt34's Avatar
 
Join Date: Mar 2008
Location: United Kingdom
County: Essex
Posts: 681

Member car:

147 GTA

He said at the top that he bought a used 60k miles rotrex charger.

I'm not talking about the milage of the car
andyt34 is offline  
Status: -
AO Member
 
gtv 3lturbo's Avatar
 
Join Date: Jan 2009
Location: France
County: Paris / Ill de France
Posts: 233

Member car:

gtv 3l turbo

you're right, sorry.
gtv 3lturbo is offline  
Status: More money !!
AO Member
 
andyt34's Avatar
 
Join Date: Mar 2008
Location: United Kingdom
County: Essex
Posts: 681

Member car:

147 GTA

Quote:
Originally Posted by gtv 3lturbo View Post
you're right, sorry.
No worries.

I think it would be better to buy a new unit as nobody knows of, or used this company before the parts will not be original rotrex and may end up being a waste of money
andyt34 is offline  
(Post Link) post #22 of 29 Old 11-09-11 Thread Starter
Status: rebuilt engine after ROTREX trouble
AO Member
 
PtiSéb's Avatar
 
Join Date: Jul 2009
Location: France
County: Paris / Ill de France
Posts: 86

Member car:

Gtv 3.0 Q2

Quote:
Originally Posted by andyt34 View Post
He said at the top that he bought a used 60k miles rotrex charger.
Sorry, it's 25k miles. I made a mistake in the conversion (40.000 kms).
This US company has good feedback. Maybe it would do the trick ?
PtiSéb is offline  
Status: More money !!
AO Member
 
andyt34's Avatar
 
Join Date: Mar 2008
Location: United Kingdom
County: Essex
Posts: 681

Member car:

147 GTA

Quote:
Originally Posted by PtiSéb View Post
Sorry, it's 25k miles. I made a mistake in the conversion (40.000 kms).
This US company has good feedback. Maybe it would do the trick ?
It very well might do. It's just a risk because they must have to make there own parts as rotrex do not sell spares.
Looking at the full cost if it need a complete rebuild you could probably buy a new one with a guarantee or find a new one one eBay.

But that's just me, I don't belive in recons. Never found them to last or work 100% like a new part
andyt34 is offline  
Status: More money !!
AO Member
 
andyt34's Avatar
 
Join Date: Mar 2008
Location: United Kingdom
County: Essex
Posts: 681

Member car:

147 GTA

The rotrex also needs an oil and filter change every 6k miles which I don't think a lot of people know or do
andyt34 is offline  
Status: Remembering why I dislike working on old cars....
AO Silver Member
 
ChrisS's Avatar
 
Join Date: Sep 2001
Location: Worcestershire
Posts: 2,712

Member car:

Mercedes C350e

Are you 100% certain it isn't one of the belt idler or tensioner bearings? Pop the belt off then spin each one by hand. Any hint of dryness or noise and that's likely the culprit. Also check it's not the waterpump bearing (not that likely...but worth a check) or alternator or PS pump or A/C compressor.

While the belt is off, make sure all the grooves in the pulleys are clean as well - they tend to accumulate junk so carefully scrape out each goove.

One other thought, the belt pulley on the crank can become misaligned as the rubber ages. Make sure that runs true as well.

Does sound a bit like the belt too - try a new one if you haven't already, best quality you can find, perhaps try a Gates Gatorback or Dayco PolyCog if you can find one.

Personally, I had a bad experience with a US firm that was supposedly expert in rebuilding superchargers. If it really is the blower, I think I'd just go buy a new one from Rotrex if they won't service it. That way you get a guarantee. Not the cheap option for sure....but honestly, I think it'll be the simplest and best answer if it really is the blower.

HTH
ChrisS is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Tuning & Upgrades

Tags
c3094 , noise , rotrex , supercharger

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome