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helical Q/C gears

Discussion in 'The Hokey Ass Message Board' started by racemad55, Oct 17, 2012.

  1. racemad55
    Joined: Dec 14, 2005
    Posts: 1,149

    racemad55
    Member

    Anybody try any in a champ size rear? Can the same cover bearings be used?
     
  2. sling392shot
    Joined: Sep 19, 2005
    Posts: 64

    sling392shot
    Member

    The helical cut gears are designed to take the whine out as opposed to straight cut gears, although they still have that distinct quickie sound just not as loud.

    The rear cover is the same.
     
  3. I run helical gears in my Speedway champ rear end. The gears don't need a different cover. They take 90% of the whine out of a QC. They take a little more power to pull, but not noticable on the street.


    [​IMG]
     
  4. junk yard kid
    Joined: Nov 11, 2007
    Posts: 2,719

    junk yard kid
    Member

    Ive been trying to find some for mine. Where are they found?
     

  5. Winters makes and sells them in limited ratios.
     
  6. junk yard kid
    Joined: Nov 11, 2007
    Posts: 2,719

    junk yard kid
    Member

    thats good, i didnt see them in the online catalog before. Thanks.
     
  7. Why have a quickie if ya can't hear it sing?????
     
  8. One reason racers don't use them much is the higher side loads helical gears place on the cover. In a cruiser, it shouldn't be an issue.

    But yeah, what fun is it if they're not whining?
     
  9. junk yard kid
    Joined: Nov 11, 2007
    Posts: 2,719

    junk yard kid
    Member

    I love it, but i wear ear plugs.
     
  10. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,948

    flamedabone
    Member

    Yes, that is the issue..the helical gears push themselves into the bearings of the cover all the time when turning. Weather that is an issue for a street car, I don't know. If I had to guess.....I would say it is not a big deal. I have ZERO scientific information to back that up, I just don't think the load would be enough to hurt anything on your basic 400 horse street car.

    One way to find out is buy a set and see what happens. Worse case you would wear out your cover bearings and maybe your cover bearing bores, but it is not likely something that will cause instant catastrophic failure.

    For the record, I like my loud quick change...

    [​IMG]

    Good luck, -Abone.
     
  11. Marty Strode
    Joined: Apr 28, 2011
    Posts: 5,937

    Marty Strode
    Member

    I installed a set in this roadster with a "Red Ram" Dodge engine when it was just built, it has 19,000 mi on it without any problems. Since new, you hear a click at times when letting the clutch out at the start, I thought about shimming the change gears a little tighter, but left it alone. Since the car is light (2,000 lbs) and the skinny rear tires spin easily, we haven't worried about "blowing the rear cover" off.
     

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  12. cabriolethiboy
    Joined: Jun 16, 2002
    Posts: 874

    cabriolethiboy
    Member

    I have been running them for 15 years with no problems. They cut the noise about 50%. Still noisey though.
    [​IMG]
     
  13. The bearings in my Winters rear cover got real loose after about 20,000 miles, I contacted Winters and they have an improved bearing that should last longer.
    If the bearings desintegrated I think they could do al lot of damage if they got to the gears.
     
  14. Oh yeah. I have a mayonnaise jar somewhere full of evidence of that...
     
  15. Pete1
    Joined: Aug 23, 2004
    Posts: 2,023

    Pete1
    Member
    from Wa.

    Mine thrust forward. Very little additional pressure on the cover.
     
  16. gearguy
    Joined: Jan 27, 2010
    Posts: 286

    gearguy
    Member

    Actually, the top and bottom gear thrusts are in opposite directions, the old equal & opposite reaction thing from Physics Class. So one shaft is always thrusting toward the cover & the other towards the case. When you back uo the thrust directions are also reversed.

    If someone really wanted quiet QC gears there is a lot that can be done with the design of the teeth. Most modern car transmissions [post 1995] have extra deep tooth forms so they get more teeth in contact.

    The same "improvements" could be applied to cam and pump drives on engines. That gear whine is traditional though so why fix what isn't broken.

    Chuck Schultz, PE
    42 years in the gear business and still enjoying it.
     
  17. treb11
    Joined: Jan 21, 2006
    Posts: 3,683

    treb11
    ALLIANCE MEMBER

    I have always thought double herringbone gears could be made, but they would be expensive. lapping the gearset might also quiet them down.
     
  18. I got mine from Speedway Engineering with the rear end. All champ size maunfacturers gears interchange. Halibrand, Speedway, Winters and Frankland gears fit any champ rear end, and from what I've seen, all have the same ratios available.
     
  19. racemad55
    Joined: Dec 14, 2005
    Posts: 1,149

    racemad55
    Member

    Thanks for all the replies guys,I think I'll try a set.
     
  20. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,948

    flamedabone
    Member

    Some gear sets are louder than others, strangely enough.. I have two sets that are close to the same ratio and one set is way louder than the other. There does not seem to be any correlation in ratio to loudness that I can find, but some sets are definately louder. Also, I noticed synthetic oil seems to make a diffrence.

    My advise it still to buy a set and try them out. I don't think they would ever cause any catastrophic failure, just might wear your bearings a bit quicker. Or, maybe they won't...

    Good luck, -Abone.
     
  21. A lot of gearsets that are close in ratio have vastly different tooth counts. I'd think that the higher the tooth count the quieter the gearset would be, regardless of ratio.
     
  22. gearguy
    Joined: Jan 27, 2010
    Posts: 286

    gearguy
    Member

    Treb11:
    The problem with double helical or herringbone QC gears would be insuring that they can still self center under load. One member has to float and the other has to be prevented from floating. Plus herringbone gears tend to be significantly lower in quality [accuracy of form, spacing, and alignment].
    The reports of one set being noisier than another are probably quality related too. Lower price QC gears may be finish milled or hobbed while the better ones are ground. Despite being in the gear trade and having friends who could make custom sets I buy mine through the usual channels. Custom ground tooth sets would have to sell for more than $1000 for a qualified shop to be interested in the market.
     
  23. racer5c
    Joined: Nov 30, 2002
    Posts: 2,218

    racer5c
    Member

    turn em around the other way
     
  24. Yep, one way they'll push against the case, the other way they'll push against the cover. Even helicals will have a slight whine at a certain RPM. Mine talk a little on deceleration between 25 and 35mph. If I turn 'em around, they whine at the same speed, but on acceleration. Pick your poison.
     
  25. NV rodr
    Joined: Jul 23, 2006
    Posts: 155

    NV rodr
    Member
    from Reno, NV

    After thousands of miles it seems to me that they have gotten quieter. Or its my imagination and I'm just used to it? It's really not even noticable to me anymore.
     
  26. Badrodder
    Joined: Aug 27, 2011
    Posts: 53

    Badrodder
    Member

    Can someone tell me if when using the helical gears you need to use two spacer shims ,one on each pinion shaft or just one on the gear that pushes against the rear cover . Thanks
     
  27. A Rodsville rear cover allows for larger thrust bearings if you run helical cut gears. I use one.
     

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