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cowl steering:should this be happening?

Discussion in 'The Hokey Ass Message Board' started by bobup, May 12, 2008.

  1. bobup
    Joined: Aug 23, 2006
    Posts: 10

    from washington

    just put my 1934 ford pickup on the ground for the first time.i did cowl steering using a bmw box with hiem joints on both ends of the drag link connecting to the backing plate of the 1941 axle.when in the air every thing seemed to work great. when on the ground as the steering wheel turns and the pitman arm goes thru its swing you can see the frame being raised and lowering with the swing. doesnt look right but can not see how to have it not be this way. this is my first time with cowl steering. is this normal or is something wrong?
  2. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,185


    Have any photos of the whole setup? It almost sounds like something in the steering/suspension is binding up when the weight of the car is down on the wheels.
  3. toddc
    Joined: Nov 25, 2007
    Posts: 981


    Any car with king pin inclination and/or caster in its steering geometry ( almost anything newer than the mid teens ) will rise and fall relative to the ground a little as the wheels move lock to lock.

    Hope that is what you have:eek:
  4. lowsquire
    Joined: Feb 21, 2002
    Posts: 2,564

    from Austin, TX

    If you have a lot of caster, the front of the car will lift slightly as you approach each lock, due to the contact point of the tyres relation to the king pin changing. if this is what you are seeing its normal. if you mean the frame you built to house the steering box is moving, relative to the chassis.. thats not so good, means its under built, or a poor design.

  5. JimSibley
    Joined: Jan 21, 2004
    Posts: 3,443


    Welcome to the HAMB, we want pics. Where in wa. are you?
  6. bobup
    Joined: Aug 23, 2006
    Posts: 10

    from washington

    dont have pictures yet but will try to post some soon.
    the frame work i built that holds the box is very stout and does not seem to flex at all. the pitman arm when centered at its lowest spot is 20.5" off the ground and 19.75" at the highest part of its swing. this how much the frame rises and lowers.
  7. mustangsix
    Joined: Mar 7, 2005
    Posts: 1,297


    Kingpin axis inclination, the angle between the kingpin (or the balljoints) and the spindle, will cause a car to "lift" as you turn the wheels thru their arc. This helps provide self centering and reduces turning forces by allowing the wheel to pivot closer to the contact patch of the tire (if the wheel offset is correct).
  8. I used a BMW box & experienced severe cowl flex before building a better mounting system.

    Never had any other issues with it though.


    Attached Files:

  9. f6fhellcat00
    Joined: Nov 20, 2005
    Posts: 21


    To much caster!
  10. Rob Paul
    Joined: Nov 11, 2005
    Posts: 1,273

    Rob Paul

    Id get it on the road and see how it is driving. Most cowl steering problems comes from Flex in the steering box mount. If your draglink slopes down to the front of the car then when you turn the wheel it will lift the car a little. Check your caster, but I assume since your building cowl steering you have your axle at 6-8 degrees.

    This car does the same thing.

  11. I am building a T also with cowl steering,,, does your current mount in the pictures flex? it looks pretty beefy ftom the pictures.

  12. Drive Em
    Joined: Aug 25, 2006
    Posts: 1,748

    Drive Em

    I have cowl steering on my T, and I have 10 degrees of caster. My car does the same thing you describe, and there is no problem with it. The car steers fine and goes strait as an arrow.

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