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improvedae86
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January 2003

Re: cheap sprinter mod	Sat, 22 January 2005 10:52

Ok what size is the tercel bar ? compaired to the sprinter bar . If the arms ? are the bar arm lengths then you might want think about the rules of sway bars . There are two primary factors that determine an anti roll bars torsional stiffness: the diameter of the bar and the length of the bar "moment arm" (more commonly known as the amount of leverage that the vehicle is able to apply against the twisting motion of the bar.) Diameter is generally the easiest concept to grasp, as it is somewhat intuitive that a larger diameter bar would have greater torsional rigidity. Torsional (or twisting) motion of the bar is actually governed by the equation: twist = (2 x torque x length)/(p x diam4 x material modulus) And since "diameter" is in the denominator, as diameter gets larger, the amount of twist gets smaller. Which, in a nutshell, means that torsional rigidity is a function of the diameter to the fourth power! This is why a very small increase in diameter makes a large increase in torsional rigidity. To compare, for example, the rigidity of a stock rear 15.0mm bar to a larger 16.5mm bar, simply use the equation, 16.54/154 which yields 1.46. In other words, a 16.5mm bar is 1.46 times as stiff or 46% stiffer than a 15.0mm bar of the same design. Add just one more millimeter to the diameter of the bar for a total of 17.5mm and the torsional strength skyrockets to 85% stiffer than the stock 15.0mm bar. (17.54/15.04=1.85.) However, in addition to the diameter of a bar, there is another very important factor that determines an anti-sway bars torsional rigidity. This factor is known as the "length of the moment arm" or in common terms, the amount of leverage between the vehicle and the bar. As with anything, an increased amount of leverage makes it easier to do work. This is governed by the "lever law," force x distance = torque. As "distance" - or the length of the lever - increases, the resulting amount of torque also increases. (This is why it was easier to move your big brother on the teeter-totter when he moved into the middle and you stayed out on the end. You enjoyed increased leverage at the end, while he suffered from reduced leverage in the middle.) Because an anti-sway bar is shaped as a "U," the ends of the bar that lead from the center of the bar to the end-link attachment serve as a lever. As the distance from the straight part of the bar to the attachment at the end link becomes longer, the torque applied against the bar increases making it easier for a given amount of energy to twist the anti-sway bar. As this distance is reduced, torque is reduced - making it more difficult for a given amount of energy to twist the anti-sway bar. It is the lever law that is applied during the design of an adjustable anti-sway bar. By using multiple end link locations, the distance from the point of attachment to the straight part of the bar can be altered. Or in engineers terms, the length of "the moment arm" can be increased or reduced in order to make more or less torque against the bar. Using a setting further from the center of the bar increases the length of the moment arm, resulting in more torque against the bar, allowing more twisting motion of the bar, creating more body roll. Using a setting closer to the center of the bar reduces the length of the moment arm, resulting in less torque against the bar, allowing less twisting motion of the bar, creating less body roll. The actual impact upon torque can be compared by dividing the center-to-center distances of the end-link attachment points. For example, the center-to-center distance of the stock rear anti-sway bar is 200mm. We can compare this to the 160mm distance of the firmest setting of the 4-way adjustable 17.5mm bar by simply dividing the distances, 160/200 = .8. In other words, a 160mm center-to-center bar produces only 80% of the torque that would be produced by a 200mm center-to-center bar of the same diameter. Or simpler yet, by using the 160mm end-link attachment points, we increase the stiffness of the anti-sway bar by an extra 20%. In short unless the bar is alot thicker , it might not be any stiffer than standard . [Updated on: Sat, 22 January 2005 10:56] [Report message to a moderator]

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