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What Makes A Blower Whine...

Discussion in 'The Hokey Ass Message Board' started by 345 DeSoto, Sep 2, 2009.

  1. I've heard that it's the belt either too loose or too tight, worn drive gears, air rushing through the carbs, etc, etc. Does anybody know for sure?...
  2. Used Up Junk
    Joined: Nov 12, 2008
    Posts: 673

    Used Up Junk
    from Merced, CA

    If I had to guess I'd say it's the drive gears for the rotors making most of the noise, kind of like the sound a gear drive for a cam makes.
  3. can't se it being a loose baby blower was brand new..weiand has a spring loaded tensioner and it's a stick prick.....rotors???i do know that when i put my foot in it, it would get louder..:cool::cool::cool:.... more air gettin stuffed????:confused::confused:
  4. Mazooma1
    Joined: Jun 5, 2007
    Posts: 13,598


    the technical answer:
    lot of shit moving around in there

  5. Al Napier
    Joined: Feb 6, 2007
    Posts: 400

    Al Napier
    from Central CT

    The toothed belt (when interfacing with the pulleys) creates the whine, similar to what happens with straight cut gears.

    You can minimize it if you'd like with some strategic drilling, but why would we want to? :)

    Al in CT
  6. bulletproof1
    Joined: Feb 23, 2004
    Posts: 2,080

    from tulsa okla

    i dont care what causes the noise, i just like it.
  7. Periah Bon3s
    Joined: Jun 21, 2009
    Posts: 57

    Periah Bon3s

    yeah no kidding, not to mention its spinning at some outrageous rpms. what is it like 16k or maybe more?
  8. roddinron
    Joined: May 24, 2006
    Posts: 2,677


    Holding her by the ears.:D
  9. onedge
    Joined: May 25, 2006
    Posts: 1,000


    gears a spinning moving all the induction. it's a great noise!
  10. Bullrack
    Joined: Aug 14, 2008
    Posts: 336

    from Louisiana

    It's the drive gears that makes them whine. Stop and think for a minute, where did the first blowers come from? Detroit diesel engines, right? Well, a Detroit diesel engine did not use a belt at all anywhere in the system and they whined too. So, what was the common factor? The drive gears are the answer. Steven.
  11. Brahm
    Joined: Oct 4, 2001
    Posts: 487


    My blower whined right out the box, and when I got had it Teflon stripped it whined even louder. I think it's just the noise the gears make, just like a loud "gear" drive instead of a chain.
  12. 50stude p/u
    Joined: Jul 14, 2009
    Posts: 169

    50stude p/u

    Most roots blowers have straight cut gears that turn both rotors. Thats what makes the noise. Same as a gear driven cam.
  13. steal32
    Joined: May 22, 2008
    Posts: 47


    Had An 8-71 On a312 in a 55 ford pu With a holley 3 bolt carb in side and 2 holley 600's on top (butterflies removed) no roters no gears with a 1/2 pitch 3" wide gilmer belt at 29% over and the s.o.b. whinned at idle
  14. Von Rigg Fink
    Joined: Jun 11, 2007
    Posts: 13,428

    Von Rigg Fink
    from Garage

    lol..dam he beat me to it:rolleyes:

    or maybe his grip is too tight down there:eek:
  15. split51
    Joined: Nov 26, 2005
    Posts: 510

    from guthrie ok

    Now that is funny...........LMAO :rolleyes:
  16. skullhat
    Joined: May 30, 2009
    Posts: 892


    onw of the best ive seen in a while lol
  17. squirrel
    Joined: Sep 23, 2004
    Posts: 47,372


    That's it.

    GMC blowers have helical gears (that's why you can time the rotors by shimming the gears), the gears are quiet.
  18. Tony
    Joined: Dec 3, 2002
    Posts: 7,350


    This is pretty much the bulk of it.
    Thats why there is a different tone to the "while" depending on if you have an 8mm belt, 1/2 pitch cogged belt or very little noise with multiple V-belts.

    Drilling the hole's as Al mentioned will alter/quiet it down if someone wanted that..
  19. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,871


    Yep, the belt makes most of the noise. If your belt is tight it will be louder than if it is loose...BUT, a tight belt is harder on your front main bearing.

    Ask Kerry how much noise his makes...he has 3 V belts instead of a toothed 8mm or Gilmer.

  20. Hi!
    Joined: Oct 4, 2006
    Posts: 730

    from SoCal

    roddinron... The best.:D
  21. Bullrack
    Joined: Aug 14, 2008
    Posts: 336

    from Louisiana

    Not trying to argue here, but what makes them whine on a Detroit diesel engine? I listen to one everyday and it sure does have mucho whine. It's not a Gilmer belt whining on this one because the blower is mounted to the side of the engine and runs on gear drives. Steven.
  22. I Drag
    Joined: Apr 11, 2007
    Posts: 884

    I Drag

    What makes your meat loaf?
  23. flynbrian48
    Joined: Mar 10, 2008
    Posts: 6,908


    I'd always heard they whine if you don't pay 'em...
  24. Tony
    Joined: Dec 3, 2002
    Posts: 7,350


    If i had to guess, it's either the gear drive system that turns it, or the style/cut of gear that is in the drive assembly that's making the noise you are hearing.
  25. Bullrack
    Joined: Aug 14, 2008
    Posts: 336

    from Louisiana

    10-4 I do admit they seem to have more whine with a belt setup. I've always chalked it up to the gears. I learn something everyday. Steven.
  26. lippy
    Joined: Sep 27, 2006
    Posts: 5,244

    from Ks

    I know on the old 3 in drive deals it use to be the air trapped between the belt and pulley's. The gears were helical cut no noise. Now it's boost on a big show car. Hi Al!! Lippy
  27. The drive gears make some noise. The rotors make most of it. Go to the far end of the strip and listen to blown alky or gas dragsters. When they open the throttle and the rotors are loaded with back pressure and the air fuel mixture, that's when things get interesting. Everything on a blower setup contributes to the sound. At full throttle, the rotors are the main offender.
  28. Tony
    Joined: Dec 3, 2002
    Posts: 7,350


    This was told to me by BDS when i was setting up the blower on my old coupe..Just about word for word. I ran a 3" Gilmer drive on mine..It was LOUD.
  29. RichG
    Joined: Dec 8, 2008
    Posts: 3,919


    The gears at speed, and it's the best damn sound in the world. I grew up around Clark Skidders running DD's at full rap, and it still makes me all warm and fuzzy to hear 'em!
  30. Like others have said, its the gear drives, the rotors and the toothed belts. The tighter the belt the louder the whine. I knew a guy back in the 80s that would take a couple of spare belts one size too small for the setup and put one on at whatever event he was at. Had to unbolt the blower, tip it to get the belt on then someone stood on the blower while it was bolted back up.
    That son of a bitch whined like nothing else!


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