G/S - ST Header pipes

Discussion in 'Old's Cool' started by TEXASYETI, Nov 22, 2008.

  1. TEXASYETI

    TEXASYETI Call me "thread killer!"

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    I am going to take a set of headers down to my local master tube bender guy and see about having a duplicate set made.

    Anyone ever done this? :ear

    I need a set and finding them used has proven to be a challenge. I see that Motobins sells them new and so does Keihan (UK) direct but they are pricey!

    BMW fiche shows only one side of the black G/S pipes and while you can get both for the ST in chrome they are 220 a side! :huh Chicago BMW might be cheaper but I am going to see what they can do locally.
    #1
  2. opposedcyljunkie

    opposedcyljunkie Heavyweight Boxer

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    Replicating them isn't a challenge at all for those guys. Just send them the originals to copy from and make sure the correct gauge of metal is used. If the gauge is thinner, they may sound different (usually with a higher note).
    #2
  3. Solo Lobo

    Solo Lobo airhead or nothing

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    MIght be interested in a set myself.... and btw, what's the part number of the rear fender you bought for your G/S?
    #3
  4. TEXASYETI

    TEXASYETI Call me "thread killer!"

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    Cool, I'll put you down for 10 sets at 400.00 per set! :evil

    Seriously though, depending on the cost - and if they can do it - I may have a few sets made. I will post the results and if you are interested let me know.

    Here is the part number for the fender. Current MaxBMW price is $80.??. Not too bad if you ask me!

    46621242635
    #4
  5. bikecat

    bikecat Long timer

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    On a side note, am I right to say that all of the airheads Type 247 engines have 38mm headers except for the R65 which has 35mm?

    Or is this too general a statement?

    Cheers
    #5
  6. Hawk Medicine

    Hawk Medicine Coyote's Brother

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    Not realy...

    Some of the post '77' bikes had 40mm pipes and those ae very desirable bikes.
    #6
  7. Joerg

    Joerg Long timer

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    These guys may be able to help you - in stainless steel: http://www.sr-racing.de/ (German required :D)
    #7
  8. Gimmeslack

    Gimmeslack furthur

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    Yep, very nice stuff. Expensive, of course...

    Note lack of collector. They claim HP increases with no flat mid-range. Also avail in Ti.

    I wonder if it makes wheel removal any harder since pipe is not tucked up as high?

    Attached Files:

    #8
  9. Gimmeslack

    Gimmeslack furthur

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    Joerg, can you interpret?
    Anyone have first-hand experience with SR?

    Attached Files:

    #9
  10. Joerg

    Joerg Long timer

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    No :lol2
    No personal experience, but I know a few people that have installed the SR exhaust and that are pretty satisfied with it. In a nutshell:

    - the exhaust is usually sold as a complete unit, which explains the lack of the collector box. It is not "just the Y pipe" that would increase torque - anyone who would claim this has not done his homework :D

    - If you drop by personally, the exhaust is custom-made for the specific bike and config (carb settings, camshaft, but also clearance for luggage bags etc). They do the carb fine-tuning and establish a dyno chart "before vs. after".

    - It is louder ... up to the legal limit. Personally I perceive it as nice but too loud - no comparison with the BROOOoooooaaaaAAAAAPP of the good old cigar exhaust on a /7 :-)

    - There are vivid discussions if their dyno charts are realistic or somewhat "influenced". Then again, many riders confirm somewhat better performance but this may be due to the sound influence ... I mean, the influence of the sound :lol3

    Disclaimer: I have no connections to that company, but I trust the first-hand reports of a few people that I know ... such as this one:
    http://maliwi.it/warzenpower/hpn/sr-racing-auspuff.html (again, in German, but also rather critical). Please note that, when you look as his charts, this is already a 1043-cc-engine, so don't expect miracles ...
    #10
  11. Solo Lobo

    Solo Lobo airhead or nothing

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    Thanks Yet, what is the number of the fiche page? I can't find it!
    #11
  12. TEXASYETI

    TEXASYETI Call me "thread killer!"

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    I am looking at fiche number #46_0019 on the Max BMW fiche for R80g/s.

    Good luck!
    #12
  13. Wirespokes

    Wirespokes Beemerholics Anonymous

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    Will these be stainless?
    #13
  14. Solo Lobo

    Solo Lobo airhead or nothing

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    Found it, Thanks!
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  15. Gimmeslack

    Gimmeslack furthur

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    :ear
    #15
  16. TEXASYETI

    TEXASYETI Call me "thread killer!"

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    I checked on stainless steel tubing today and the price was pretty Freaking steep. Lets just say I am going to try some other suppliers!

    $25.?? dollars a foot!

    Granted, this was from a supplier who sells aerospace quality tubing. I don't think we need quite that standard of quality for our little old exhaust headers.

    More to come!
    #16
  17. TEXASYETI

    TEXASYETI Call me "thread killer!"

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    I noticed on my G/S templates that the end of the header is flared to 38mm where it would attach to the head. The rest of the tube is about 35mm od. If someone who is good with a micrometer and wants to give me exact dimensions, including wall thickness, that would be cool. I am going to measure my stuff and we can then compare results.

    If Anton is done measuring his fork, maybe he can help? :ear

    Edit: I did do some looking and found a national supplier with an office in Fort Worth. I am going to go down there tomorrow or wednesday and see what's what.

    Also, it seems like most of the suppliers I am running into measure their stuff in inches. I did a quick calculation of our 38mm headers and that = 1.496 inch

    Any ideas on how that would fit without modification or alteration. there is a little wiggle room but is that enough?
    #17
  18. Frank Warner

    Frank Warner Traveller

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    Don't think you'll get thinner than the bm originals! Done for weight savings I'd think... very thin.

    The G/S ones were painted flat black. The ST ones were chromed .. and lasted all of 6 months more ... in my experience. I eventually got the staintune system. Still on the bike.

    Staintune would still make these .. place order and wait for factory to make them. They will still be 'on the books' - so makeable.
    Think Staintune uses 308 stainless.
    #18
  19. Wirespokes

    Wirespokes Beemerholics Anonymous

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    Most stainless exhausts I've seen are made from 308. And 38mm is close enough to pass for 1.5", which will work just fine.
    #19
  20. Caddy82rats

    Caddy82rats Long timer

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    The R100 GS headers are not the same ?
    #20