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Technical 6-71 blower

Discussion in 'The Hokey Ass Message Board' started by Claes Persson, Dec 15, 2016.

  1. Claes Persson
    Joined: Dec 15, 2016
    Posts: 7

    Claes Persson

    I recently bought a 6-71
    The seller told me it is a big bore BDS
    There is no name on it
    on the inside it is stamped Drmi 12r8 5155866
    Hope somebody can help me decoding it
    Thank you
    Claes
     
  2. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,504

    gimpyshotrods
    Member

    How about some pictures?
     
  3. 19Eddy30
    Joined: Mar 27, 2011
    Posts: 979

    19Eddy30
    Member
    from VA

    X2.
    Go to BDS web site , is it aBDS case or One converted by BDS?
    Pics will help us,
     
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 44,346

    squirrel
    Member

    that's the GM casting number for a 6-71. Does it have end plates, etc? my BDS blower says BDS on both ends of it...but they changed how they did things, over the years. Pictures will help us figure it out, of course.

    and you're supposed to ask these questions before you buy
     
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  5. Claes Persson
    Joined: Dec 15, 2016
    Posts: 7

    Claes Persson

    ok i will try to post some pictures asap
    Claes
     
  6. Fordors
    Joined: Sep 22, 2016
    Posts: 2,366

    Fordors
    Member

    I think the Drmi might be DRM1. The 5155866 is most likely the GM number that identifies the casting and the part number for the case, once machined, would be different than that. Sounds like an OEM GMC/Detroit Diesel blower that was set up by BDS.
     
    loudbang likes this.
  7. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,504

    gimpyshotrods
    Member

  8. Claes Persson
    Joined: Dec 15, 2016
    Posts: 7

    Claes Persson

    Ok i understand
    So in the beginning Weiand. Bds and other companies took OEM blowers
    and rebuilded them.
    Any idea what DRM 1 stands for
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 44,346

    squirrel
    Member

    probably something to do with the casting process, or tooling. I doubt it's important.

    this is what my BDS blower says underneath.

    blowerdate.jpg
     
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  10. Claes Persson
    Joined: Dec 15, 2016
    Posts: 7

    Claes Persson

  11. Claes Persson
    Joined: Dec 15, 2016
    Posts: 7

    Claes Persson

    Thank you all for you
    Help
    Next spring i will put it on top of my CBB


    Sent from my iPhone using The H.A.M.B. mobile app
     
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  12. Claes Persson
    Joined: Dec 15, 2016
    Posts: 7

    Claes Persson

  13. squirrel
    Joined: Sep 23, 2004
    Posts: 44,346

    squirrel
    Member

    If it doesn't say BDS on it anywhere, or have their stamp (circle with BDS inside) and a serial number stamped by them, then it is probably not a BDS rebuilt unit. That is not a bad thing, it just means that the seller was telling a fib, which is pretty common.

    Looks like a fun thing to do! Might want to use a square tooth, 1/2" pitch belt and pulleys, for the old time look.
     
  14. I like where your putting the blower.....
     
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  15. Visionary pinstriping
    Joined: Aug 6, 2011
    Posts: 35

    Visionary pinstriping
    Member
    from amherst ny

    That looks like an 8MM pulley on there now with a nice billet snout. the front bearing housing is original Detroit diesel unit, the triangle shaped plate is where the injector pump once was. those original housing ends are desirable with the nostalgia racers.
    Do the rotors have any strips in them ? you just need to make sure that the clearances are set up for gasoline and not alcohol, they actually machine the ends of the rotors for expansion.
     
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  16. Claes Persson
    Joined: Dec 15, 2016
    Posts: 7

    Claes Persson

  17. That triangle plate was where the fuel transfer pump was, the injectors in the head developed the high pressure. but i'm just splitting hairs. ;)
     
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  18. ago
    Joined: Oct 12, 2005
    Posts: 2,200

    ago
    Member
    from pgh. pa.

    There was two sizes of GMC 6-71 blowers. Rotor diameters.
     
  19. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,504

    gimpyshotrods
    Member

    The HAMB search engine is fairly literal. You will likely have more and better result if you search on the term 6-71, rather than the mathematical ratio 6:71.
     
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  20. DDDenny
    Joined: Feb 6, 2015
    Posts: 12,907

    DDDenny
    Member
    from oregon

  21. squirrel
    Joined: Sep 23, 2004
    Posts: 44,346

    squirrel
    Member

    I thought search engines ignored those funny characters like - and : and only look at the numbers and letters? but the HAMB search only works on longer numbers than 2 digits.

    But yeah, the colon bugged me too
     
  22. ago
    Joined: Oct 12, 2005
    Posts: 2,200

    ago
    Member
    from pgh. pa.

    A trio of GMC blowers: 3-71, 4-71, 6-71. IMG_0716.JPG IMG_0717.JPG IMG_0718.JPG
     
  23. porknbeaner
    Joined: Sep 12, 2003
    Posts: 41,391

    porknbeaner
    Member

    if you want real old school you use primary chain. :D :D :D
     
  24. Gene Boul
    Joined: Feb 9, 2006
    Posts: 807

    Gene Boul

    What are you going to do with it? Is it show or go? If it is a "show" puffer then it will work without rotors. If you are going to race then you need to start over. Rotors need strips and end clearance setup etc.
     
  25. ago
    Joined: Oct 12, 2005
    Posts: 2,200

    ago
    Member
    from pgh. pa.

    I would not run an empty blower. I set up a 6-71 on my Hemi. Might put the 3-71 or 4-71 on Dodge Hemi. Clearance no problem. You don't need strips on street motor, They wear out in time. without strips can make over 7psi boost or more with pulley change. Don't need much more on street motor.
    Have over 20,000 miles on my blown 354 Hemi 7psi.
     

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