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what can you guy tell me about an RTI ramp

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by James90, Sep 3, 2001.

  1. James90

    James90 1/2 ton status

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    I am in the machining technology program at my local community colege

    and one of my classes is metrology (measuring and gaging)
    and some time this semester I have to give a presintation on some form of measuring not used in the machin shop

    so I thot what would be better than showing how to measur flex with a RTI ramp but I dont know all that much about them I dont even know what RTI means

    so could you tell me what you know about them or some web sites where i could a nuff info to give a good demo on how one works

    thanks guys

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  2. hammer

    hammer 1/2 ton status

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    ramp travel index
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    RTI stands for Ramp Travel Index. It measures the amount of flex and assigns a number based on measurments taken when the vehicle can no longer proceed without a tire lifting.

    the number is calculated by how far up the ramp the vehicle has driven divided by its wheelbase. A vehicle with a 100" wheelbase that travels 70" up the ramp scores a 700 on that ramp. Common ramp angles are 20, 23 25 and 30 degrees.

    The ramp was originally thought up and built by four wheeler mag as a testing and comparison tool. The first ramps were 20 degrees, but as trucks got flexier the angles have increased.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  4. White Knight

    White Knight 1/2 ton status

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    The problem with ramps, are that they can be cheated on, postion of tire on the ramp and the air in the tires, but hey they're a great way to check befores and afters when you've worked on the the suspension. I would be aware that just because you ramp a certain number doesn't make it any better or worse on the trail...I know of a truck that ramps better than my Blazer but I go places he never thought of.

    Later
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    White Knight
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Our club has a ramp...I like to keep the variables to a minimum when I ramp so I have reasonably reliable number to make comparisons.
    Our general rule of thumb when we hold a ramp contest is "trail pressure" is OK and half of the tire must be on the ramp.

    I agree a ramp queen does not necessarily make a great trail rig though.

    Rene

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  6. wayne

    wayne 3/4 ton status

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    <a target="_blank" href=http://www.offroaders.com/info/tech-corner/rti.htm>http://www.offroaders.com/info/tech-corner/rti.htm</a> Hope this helps.

    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  7. James90

    James90 1/2 ton status

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    thanks guys

    I might even get an A

    i thank i might make a min RTI to ramp my 4 wheeler on to help give my demo and get what I am trying to tell them a cross

    once agine thanks

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