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What causes cowl shake

Discussion in 'The Hokey Ass Message Board' started by RDAH, Jul 11, 2012.

  1. RDAH
    Joined: Mar 23, 2007
    Posts: 465

    RDAH
    Member
    from NL, WI

    Yes I did a search, but here's the deal. "27 Speedway kit I put together 2.5 years ago & now have 900 miles on it & why now is it shaking ? When I built it I put 60 feet of 1" square tubing around the doors, cowl & all the way to the back. Front end has 7* of caster & 1/16" of toe. This shake mostly happens at around 60 mph. Everything under the car still seems tight. Any remedies would be appreciated.
     
  2. Greaser Bob
    Joined: Mar 5, 2006
    Posts: 1,325

    Greaser Bob
    Member

    Funny how a lot wheel problems seem to happen from 55-65. Are you all balanced when it comes to tires? Could be a simple fix:)
     
  3. Terrible Tom
    Joined: Feb 15, 2010
    Posts: 573

    Terrible Tom
    Member

    Yup, had a similar problem and it turned out that a front wheel was slightly bent. You might try swapping wheels and see what happens.
    Tom
     
  4. Von Rigg Fink
    Joined: Jun 11, 2007
    Posts: 13,426

    Von Rigg Fink
    Member
    from Garage

    most dont call it "Cowl shake"..so if you have been looking it up or searching it on this site using that wording..thats why you havent found it


    search death wobble or front end shake

    advice....check to see if you have any play in any of your front end components..tie rods , perches, steering box., king pins..etc..

    than check wheel runout..and balance of the tires..also roundness of the tires if they are bias
     

  5. Ole don
    Joined: Dec 16, 2005
    Posts: 2,915

    Ole don
    Member

    You said you put in steel tube, is it glassed to the body pannels? I built three cars with glass bodies, I glassed wood in. I used 3/4 inch plywood to reinforce the firewall, then 3/4 poplar around the doors and the back, and 5/8 or 3/4 marine grade plywood for a floor. Double glassed in all the way around. The bodies get heavy, but solid. Wood and fiberglass have nearly the same coeficient of heat expansion, steel grows more.
     
  6. monc440
    Joined: Feb 1, 2011
    Posts: 260

    monc440
    Member

    A steering dampner will help. We have had a couple A's that we couldn't find the problem, tires & rims good, king pins good, tie rods good, gear box good, just couln't find it. put in a dampner and 10,000 miles later still no shake and no failures.
     
  7. flatoutflyin
    Joined: Jun 16, 2010
    Posts: 385

    flatoutflyin
    Member

    What type tires are you using? My severe 55 MPH cowl shake was directly related to out of round bias-ply tires. I tried a dampener, balancing, various tire pressures. I trued my tires and fixed the problem. That's me, camera in one hand, at 70 MPH.
     

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  8. I know that it is only 900 miles but in 900 miles even short jaunts a lot of things can happen. I think if it were mine I would start crawling around and tightening and looking for things that may be cracked.

    That is the first thing I would do anyway.
     

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