alignment math, all you numbers guys check my math!! |
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alignment math, all you numbers guys check my math!! |
jaybird840 |
Jan 4 2008, 02:11 PM
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#1
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Member Group: Members Posts: 163 Joined: 27-September 06 From: Austin, TX Member No.: 6,927 Region Association: Southwest Region |
OK,
I'm working on a home alignment on my teener, and am trying to calculate my camber adjustments. I can't use the bird board measurements because I'm running 18" wheels. So, in order to get an adjustment measurement, I calculated the circumference of my wheels--outer lip to outer lip (this is where I take my measurements). C=diameter x pi--right? So if my wheels measure 19.5", then the circumference = 19.5 x 3.14159 which gives a circumference of 61.26". If you divide the circumference by 360, then 1 degree = .17". In order to run 30" of negative camber, I divide by three again to give me .05" or 1.43mm. Now, in order to achieve that number, I must multipy by two to get the actual measurement from the bottom of the rim to the top of the rim, right? Long story short, my measurement needs to be 2.86 (call it 3mm) greater at the top of the rim than the bottom of the rim, right? I'm a cop, not a math genius, so you engineers feel free to chime in.... thanks tons!!!!! While on the subject of alignments.... What should the toe in measurements be in degrees? Am I right that a 32nd on 15's is different than a 32nd on 18's? --jaybird |
sww914 |
Jan 4 2008, 03:46 PM
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#2
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
I bought one of these, it's only $40.00. http://www.racerpartswholesale.com/product...r_Camber_Gauges
It's not nearly as easy to use as the $200.00 units, but it works. For measuring toe, I spin the tires, make a line with chalk on the tread, scribe a line in the chalk with a sharp screwdriver, and measure between the scribed lines on the front and rear of each tire after I let the car down and bounce/roll it. |
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