Classic Audi Technical Mech/Tech Engine » KV exhaust

Reply
 
Thread Tools Display Modes
Old 07-06-17, 01:18 PM   #1
Mellis46
Aero Advocate
Classic Audi Club Member
 
Mellis46's Avatar
 
Join Date: Aug 2014
Location: Lancashire
Posts: 1,060
Default KV exhaust

The back box on my 1989 B3 90 2.2 KV quattro has rotted through again where the intermediate pipe meets the back box. MOT is looming!

I struggled last time to find a back box for it hence plumping for a CES supplied Bosal jobbie, but this one has only lasted about 6 years, now they seem to be even thinner on the ground. I perhaps should have gone for a stainless one back then but...

Question: could the (more easily obtained) back box from a 90 quattro 20v be a straight swap? The triangular flange where the back box bolts up certainly looks similar. Part numbers are subtly different, but then so are the tail pipes. Something is niggling me the intermediate pipe diameters might be different...? I'm only talking back box, not going into cats or downpipes or anything else I know is different further up the system

I suppose i could get one made, have heard of people having issues with clearance that mean they keep having to go back for "fettling" however.

Anyway, thanks for any input anyone can provide!
__________________
-1987 90 2.2E / Sapphire Blue (Rest in Pieces)
-1989 90 quattro with Sport Equipment / Satin Black
-1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)
-2012 A1 Sport TFSI / Glacier White (Sold)
-2017 A1 Sportback S-line TFSI / Scuba Blue
Mellis46 is offline   Reply With Quote
Old 07-06-17, 03:57 PM   #2
mikes2
Senior Member
Classic Audi Club Member
 
Join Date: Nov 2007
Location: Polmont
Posts: 1,465
Default

pipe size is different on the 20v - 60mm instead of 55mm on the 10v.

you may get away with it bolting up ok
__________________
1991 90 quattro 20v sport
1993 S2 estate
mikes2 is online now   Reply With Quote
Old 07-06-17, 04:10 PM   #3
quattrodave
Grown up member
Classic Audi Club Member
 
Join Date: Dec 2010
Location: Bingley
Posts: 441
Default

Quote:
Originally Posted by mikes2 View Post
pipe size is different on the 20v - 60mm instead of 55mm on the 10v.

you may get away with it bolting up ok
A few years ago I managed to fit a NOS geniune Audi S2 rear box to my dads KV engined B3 90 quattro (got it at the then bargain price of 90), regretfully we sold the car about 4 weeks later before I had chance to swap it for one of my other non geniune spare ones. So yes it can be done I think we used a section of the (uncorroded) original exhaust as a packer with lots of exhaust cement to ensure a tight fit.

If you really struggle to find a rear box I have a spare 60mm (from a V6 coupe quattro) I can sell you.
quattrodave is offline   Reply With Quote
Old 07-06-17, 07:23 PM   #4
Mellis46
Aero Advocate
Classic Audi Club Member
 
Mellis46's Avatar
 
Join Date: Aug 2014
Location: Lancashire
Posts: 1,060
Default

Mike, Dave, Thanks for the info, appreciated

Will see what i can sort
__________________
-1987 90 2.2E / Sapphire Blue (Rest in Pieces)
-1989 90 quattro with Sport Equipment / Satin Black
-1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)
-2012 A1 Sport TFSI / Glacier White (Sold)
-2017 A1 Sportback S-line TFSI / Scuba Blue
Mellis46 is offline   Reply With Quote
Old 08-06-17, 07:06 AM   #5
Tun
Grown up member
Classic Audi Club Member
 
Tun's Avatar
 
Join Date: May 2011
Location: Buxton
Posts: 678
Default

Mark, this is the one I fitted to my 90 prior to selling it. The service was exceptional and I was really impressed with the quality. As Mike says the bore is bigger but it does show the part number for the KV (893 253 609 P).

http://www.ebay.co.uk/itm/1218754050...%3AMEBIDX%3AIT
__________________
1988 MB quattro
2012 S4 Avant
Tun is offline   Reply With Quote
Old 08-06-17, 07:29 AM   #6
Mellis46
Aero Advocate
Classic Audi Club Member
 
Mellis46's Avatar
 
Join Date: Aug 2014
Location: Lancashire
Posts: 1,060
Default

cheers Royston, will take a look
__________________
-1987 90 2.2E / Sapphire Blue (Rest in Pieces)
-1989 90 quattro with Sport Equipment / Satin Black
-1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)
-2012 A1 Sport TFSI / Glacier White (Sold)
-2017 A1 Sportback S-line TFSI / Scuba Blue
Mellis46 is offline   Reply With Quote
Old 10-02-18, 04:22 PM   #7
Mellis46
Aero Advocate
Classic Audi Club Member
 
Mellis46's Avatar
 
Join Date: Aug 2014
Location: Lancashire
Posts: 1,060
Default

I finally purchased the exhaust in Royston's link. The genuine back box was available from Audi Tradition but at last look it was well over 500Euro. This one was a little over 150Euro when I bought it plus postage.

The quality did indeed seem to be very good, sporting an extra brace across the common failure point just before the silencer itself.







As it is meant for the 20v it does indeed have a wider diameter pipe, the flange was also noticeably larger. Despite this the existing sealing ring fitted inside quite happily and by gradually tightening each nut and rotating both sides together I was able to get a tight fit without too much bother...



It mightn't look too pretty but it doesn't leak!

Being really picky the pipes sit slighty lower and with more space in between them than the old one, but the car sounds a whole lot healthier now and is obviously that bit more roadworthy again!

Time for the knackers yard for this crusty thing!



Cheers again for all the help given all those months ago!
__________________
-1987 90 2.2E / Sapphire Blue (Rest in Pieces)
-1989 90 quattro with Sport Equipment / Satin Black
-1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)
-2012 A1 Sport TFSI / Glacier White (Sold)
-2017 A1 Sportback S-line TFSI / Scuba Blue
Mellis46 is offline   Reply With Quote
Old 10-02-18, 06:22 PM   #8
vorsprung durch technik
4 ring whore!
Classic Audi Club Member
 
vorsprung durch technik's Avatar
 
Join Date: Feb 2014
Location: Near Watford.
Posts: 6,503
Default

A good result Mark, looks like a plan came together well!

vorsprung durch technik is offline   Reply With Quote
Old 10-02-18, 06:24 PM   #9
Mellis46
Aero Advocate
Classic Audi Club Member
 
Mellis46's Avatar
 
Join Date: Aug 2014
Location: Lancashire
Posts: 1,060
Default

Well, a big saving was made on something which is essentially a consumable. Allowed me to spend elsewhere
__________________
-1987 90 2.2E / Sapphire Blue (Rest in Pieces)
-1989 90 quattro with Sport Equipment / Satin Black
-1997 A4 Avant quattro TDI 110 / Tropical Green (Sold)
-2012 A1 Sport TFSI / Glacier White (Sold)
-2017 A1 Sportback S-line TFSI / Scuba Blue
Mellis46 is offline   Reply With Quote
Old 10-02-18, 06:27 PM   #10
vorsprung durch technik
4 ring whore!
Classic Audi Club Member
 
vorsprung durch technik's Avatar
 
Join Date: Feb 2014
Location: Near Watford.
Posts: 6,503
Default

It's looking well Mark.
vorsprung durch technik is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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
Forum Jump


All times are GMT. The time now is 04:29 PM.

Powered by vBulletin®
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright ©2007-2008 Classic Audi | Site by Roadrunna