14/71 BilletBlowers ?

Discussion in 'PSI Superchargers Tech Questions' started by lucky devil, Jun 14, 2016.

  1. lucky devil

    lucky devil Member

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    Just curious for future decisions...
    Who has experience with "worked" 14/71 blowers. What results did you see over anything else you used previously ?
    Running at 20 over.

    Thanks Wayne
     
    #1
    lucky devil, Jun 14, 2016
  2. Will Hanna

    Will Hanna We put the 'inside' in Top Alcohol
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    From what I gather talking to people, the billet case is more for longevity of strip life. If you had a fresh cast case with the same mods with a fresh billet, I believe they would be pretty close.

    The blower is the most important part on the car, so anything you can do to make it better, especially with restricted overdrive, is huge.
     
    #2
    Will Hanna, Jun 14, 2016
  3. lucky devil

    lucky devil Member

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    Thanks Will.
    I am interested in the difference in boost gains , say between a modified K11 and a brand new Billet piece. It would be great if some racers have real world experience of then and now.

    P.S great site Mr Hanna
     
    #3
    lucky devil, Jun 14, 2016
  4. Mike Canter

    Mike Canter Top Dragster
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    the critical part of sealing for boost in a blower is the normally white stripes and they do not rub against the case of the blower and only push against the rotors. They are there to stop the compressed air from pushing back up between the rotors. The black strips on the rotor tips are what rub against the case and they are not as critical in wear. Given all that I would fail to see what big difference a billet case would make other than the rotor alignment being more accurate for the bearings from one end of the case to the other.
     
    #4
    Mike Canter, Jun 14, 2016
  5. lucky devil

    lucky devil Member

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    Thank you Mike.

    I appreciate your answer as always.
     
    #5
    lucky devil, Jun 15, 2016
  6. Mike Canter

    Mike Canter Top Dragster
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    From what I have been told that bearing placement both front and back is what makes the difference between two of the same model Superchargers putting out different amounts of boost. Top fuel guys would buy many blowers and test them to get the ones that put out the most boost. You can see the same problem in screw blowers but since they have no stripping they coat the screws to close the gap and make more boost.
     
    #6
    Mike Canter, Jun 15, 2016
  7. jay70cuda

    jay70cuda Well-Known Member

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    Here's what I've been told and witnessed , it all depends on the case. Even billet ones are bad from the get go. I've seen chf cases be out of round and useless. Never having a rotor put in it. Problem with buying a new one is how do you know if you got a good one? Just cuz it's new doesn't mean it a good piece. I'd rather buy a used blower from Janis, galot where you know there a proven piece.
     
    #7
    jay70cuda, Jun 16, 2016
  8. lucky devil

    lucky devil Member

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    Hi Jay ,

    thanks for your input.
    I am hoping some racers can come back to me with real world experience of the increases they have seen after having their blower re-worked.
    Thanks again Wayne
     
    #8
    lucky devil, Jun 16, 2016
  9. Mike Canter

    Mike Canter Top Dragster
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    I agree with Jay and ask to look at the amount of boost on a Racepak run
     
    #9
    Mike Canter, Jun 16, 2016
  10. lucky devil

    lucky devil Member

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    I have been speaking to someone with real world numbers
    He had an M5 , and switched to a worked K11 and now sees 44psi at 25 over.
     
    #10
    lucky devil, Jun 19, 2016
  11. jay70cuda

    jay70cuda Well-Known Member

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    M5 is not billet. I had one of those. I've had stock k11, m5 , billes mod m5, and billes cast bad ass legal blower. Boost means nothing? I had my m5 at 20 over make 42lbs of boost. Wouldn't run. A camshaft will lie and manipulate boot to where you want to see it. That's why a cam from Janis or billes , any builder will run you $1500. When they sell cams for 650$. You think crane, comp, Bullet cams is selling you the same cam that any of those guys run??? Never!
     
    #11
    jay70cuda, Jun 19, 2016
  12. lucky devil

    lucky devil Member

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    Hi Jay
    I know the M5 isnt billet. Maybe you can share the results you experienced between the blowers you have used ? I get your point on the cams
     
    #12
    lucky devil, Jun 19, 2016
  13. lucky devil

    lucky devil Member

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    Iam really surprised we didnt get more real world input with this thread. Maybe everyone is keeping their experiences a secret :)
     
    #13
    lucky devil, Aug 26, 2016
  14. HootersFunnyCar

    HootersFunnyCar Member

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    It's not just the case, the rotors play a vital role in making power.
    I had a Littlefield K-8 that scuffed up the rotors pretty bad so I put in a brand new set of "See's" Spelling?? rotors ( supposed to be a copy of the K-8 ) and ran most of the year. The car was slow and fought it most of the season until broke a shaft on the rotor. Put the old beat up K-8 rotors back in the same case and picked up over a tenth on the first pass. Big difference in performance between these two rotor profiles.
     
    #14
    HootersFunnyCar, Aug 26, 2016

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