Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > BMW Tech
BMW Tech BMW Tech Forum - For Questions specific and of interest to BMW riders only.
Photo by Daniel Rintz, Himba children, Namibia

The only impossible journey
is the one
you never begin

Photo by Daniel Rintz,
Himba children, Namibia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 3 Jun 2009
Registered Users
HUBB regular
 
Join Date: Jan 2005
Posts: 48
Header pipes R80GS basic

I have decided to replace the header pipes on my basic. The original pipes had a standard cross-over piece but I have seen some for sale for a paralever 80GS that just has the 2 pipes without the cross-over. Anyone know if this arrangement is ok interms of carb balancing etc? If this was such a good idea why wasnt the bike factory fitted with them in the first place? I have already got rid of the (rust) collector box in favour of a Y-piece, is a change of header-pipe configuration as well going to cause any problems?
cheers
mark
Reply With Quote
  #2  
Old 3 Jun 2009
AliBaba's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Apr 2001
Location: Norway
Posts: 1,379
Best setup = crossover + collector
Reply With Quote
  #3  
Old 4 Jun 2009
Registered Users
Veteran HUBBer
 
Join Date: Oct 2002
Location: Stockholm - Sweden
Posts: 317
low-rev torque is affected tremendously.

I have dual balance-pipes and have tested singel balance pipe on one of my R100 bikes. The R100 lost so much low-rev torque that I "tossed" those down-pipes.
At higher revs 4500(?) and up - it seems not to matter so much.

If you ride at 3000rpm and below off-road... I strongly recommend that you use -dual- balance pipes.

MOTOSPEED.se - Your Performance Partner
Made a serious study into balance pipes on R1100 japanese engines back in the late 80:ties or early 90:ties. I have not found that study on their homepage now... however, they used their study in their ads back then. Just ask them and they should send their old ad/study to you -
__________________
Drive Safely,
Albert
Reply With Quote
  #4  
Old 4 Jun 2009
Registered Users
HUBB regular
 
Join Date: Jan 2005
Posts: 48
Thanks for your replies, I will stick to the cross-over pipes
Reply With Quote
  #5  
Old 16 Jun 2009
Airhead Wrangler's Avatar
Registered Users
New on the HUBB
 
Join Date: Apr 2009
Location: Seattle
Posts: 14
I have a 1984 R80ST that's been modified to be a monolever GS. I'm looking at replacing the stock exhaust system so I don't ruin it on a long trip to south america (I've saved all stock parts for the bike so that I can make it stock again someday if I want) I was thinking of using a system off a paralever GS, but thought I'd ask if it's worth adding the forward balance pipe. I probably wouldn't use the HUGE GS collector because there probably isn't any room for it in the space for the ST / G/S collector which is much smaller. I would probably go with a y-pipe instead. Any input? Any reasons I shouldn't?
Reply With Quote
  #6  
Old 17 Jun 2009
Contributing Member
Veteran HUBBer
 
Join Date: Aug 2001
Location: B.C. Canada
Posts: 209
Hi Wrangler, simplemind,
I have a 84' R80RT BMW and an 81' G/S.
The RT has the crossover and the G/S does not. I notice no difference in the performance of the engines.
The RT has 400,000kms on it and has been around the world.
The G/S has 40,000miles and has been around the block.

Wrangler,
You do not need to worry about wrecking your exhaust on a south America trip.
Watch out for the Topes (speed bumps, mostly unmarked) in Mexico and parts of Central America.
The Canyon del Pato road (a must) up to Huaraz in northern Peru has some pretty big sharp rocks, and Ruta 40 in Argentina is kind of hard on the undersides of bikes, but mostly it is good going.
The hardest part of a South America trip is Central American Border crossings. Check out Jeff Munn's Central America border crossing info on ADV Rider, it is helpful stuff.
The best part of a South America trip is the wonderful People you will meet and the Amazing places you will get to go to.
Suerte Amigo
Reply With Quote
  #7  
Old 19 Jun 2009
Registered Users
Veteran HUBBer
 
Join Date: Feb 2002
Location: Wessex, UK
Posts: 2,136
Y piece on my 80GS is fine

I have a complete stainless steel Keihan exhaust system on my 1992 paralever GS including the y piece replacement for the collector box, it all works fine and last for years
Reply With Quote
  #8  
Old 8 Jul 2009
Gold Member
Veteran HUBBer
 
Join Date: Mar 2001
Location: British Columbia
Posts: 246
My '82 R80 G/S has no crossover on the (I believe) stock pipes, just the collector box at the rear. I have run this system as well as a supertrapp with the larger header pipes (from an R100), no cross over, and a 'Y' type collector replacement - again it seemed to be fine. Any changes to your exhaust can affect carburetor setting, so it is worth making sure that your bike is tuned properly to the exhaust fitted.
Reply With Quote
  #9  
Old 13 Aug 2009
Registered Users
Veteran HUBBer
 
Join Date: Jun 2005
Location: Cape Town / South Africa
Posts: 207
Balance Pipe = Low RPM torque

The R80G/S from 1980 to 1987 produced 56.7 Nm / 41 ft lb at 5,000 rpm. This model did not have the balance pipe and the collector box was a simple but flawed design.
The Later models fitted with balance pipe and large centre box was giving 61 Nm / 44 ft lb at 3,750 rpm.
The short shaft and centre stand of the pre 87 models does not accommodate the larger centre box so in this case fitting some of the aftermarket systems might not have much of a negative influence on low RPM torque.
If you do not mind the slightly reduced Horse Power and prefer torque at low RPM it will be best to stick with the original exhaust from BMW on all the models from 87 onward. Basically this is all the models fitted the with Parra-lever suspension.
Reply With Quote
  #10  
Old 13 Aug 2009
Registered Users
Veteran HUBBer
 
Join Date: Jun 2005
Location: Cape Town / South Africa
Posts: 207
Quote:
Originally Posted by mark manley View Post
I have a complete stainless steel Keihan exhaust system on my 1992 paralever GS including the y piece replacement for the collector box, it all works fine and last for years
Hi Mark, post us a picture of that bike of yours...I like the looks of that tank you have fitted.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
motad header gavxt600e Yamaha Tech 4 29 Mar 2008 13:18
Rotor and regulator R80GS Basic AliBaba BMW Tech 2 6 Mar 2002 16:10
Panniers and Frames for R80GS Basic coops BMW Tech 5 14 Dec 2001 09:42

 
 

Announcements

Thinking about traveling? Not sure about the whole thing? Watch the HU Achievable Dream Video Trailers and then get ALL the information you need to get inspired and learn how to travel anywhere in the world!

Have YOU ever wondered who has ridden around the world? We did too - and now here's the list of Circumnavigators!
Check it out now
, and add your information if we didn't find you.

Next HU Eventscalendar

HU Event and other updates on the HUBB Forum "Traveller's Advisories" thread.
ALL Dates subject to change.

2024:

Add yourself to the Updates List for each event!

Questions about an event? Ask here

HUBBUK: info

See all event details

 
World's most listened to Adventure Motorbike Show!
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)



Ripcord Rescue Travel Insurance.

Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.

Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.

Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!


 

What others say about HU...

"This site is the BIBLE for international bike travelers." Greg, Australia

"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK

"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia

"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA

"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada

"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa

"This is the answer to all my questions." Haydn, Australia

"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany

Lots more comments here!



Five books by Graham Field!

Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook

"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.



Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!

New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.




All times are GMT +1. The time now is 03:35.