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General Discussion
Rockwells make your sac swell!
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<blockquote data-quote="patooyee" data-source="post: 325844" data-attributes="member: 483"><p>Its not front / rear that matters. Its tie rod mount inboard vs. outboard of kingpin.</p><p></p><p>Rockwell knuckles have the tie rod inboard of the kingpin. That means for rockwell knuckles, on a front axle, the arms have to point backwards to get correct Ackerman.</p><p></p><p>Dana knuckles have the tie rod hole outboard of the kingpin so that correct Ackerman is obtained with the arms pointing forwards. If you swapped sides with Dana knuckles so that the arms pointed backwards you would get incorrect Ackerman.</p><p></p><p>I tried to find a good pic of a d60 knuckle and can't. The best one I can find that demonstrates all this is a CAD model pic:</p><p></p><p><img src="http://www.artecindustries.com/assets/images/highsteer/d60-knuckle-hsa-assembly-colors2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Notice how the tie rod hole is obviously outboard of the kingpin?</p><p></p><p>Now see hoe the rockwell tie rod hole is obviously inboard of the kingpin:</p><p></p><p><img src="http://www.rockwellparts.com/rockwell-pictures/rockwell-knuckle.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>If you looked at a birds eye view of the knuckles and draw a vertical line from kingpin to rear axle and then another line from kingpin through tie rod hole, the angle between these two lines is your Ackerman angle. Ideally when you do this on both sides the lines intersect in the center of your rear axle. But if you draw this same diagram with rockwell knuckles pointing forwards that is not what happens. Instead the lines intersect somewhere in front of the vehicle giving you crap steering.</p><p></p><p>And this isn't just for race cars. I immediately noticed the difference just pulling out of the shop today at .5 mph. The rig turns noticeably sharper.</p></blockquote><p></p>
[QUOTE="patooyee, post: 325844, member: 483"] Its not front / rear that matters. Its tie rod mount inboard vs. outboard of kingpin. Rockwell knuckles have the tie rod inboard of the kingpin. That means for rockwell knuckles, on a front axle, the arms have to point backwards to get correct Ackerman. Dana knuckles have the tie rod hole outboard of the kingpin so that correct Ackerman is obtained with the arms pointing forwards. If you swapped sides with Dana knuckles so that the arms pointed backwards you would get incorrect Ackerman. I tried to find a good pic of a d60 knuckle and can't. The best one I can find that demonstrates all this is a CAD model pic: [IMG]http://www.artecindustries.com/assets/images/highsteer/d60-knuckle-hsa-assembly-colors2.jpg[/IMG] Notice how the tie rod hole is obviously outboard of the kingpin? Now see hoe the rockwell tie rod hole is obviously inboard of the kingpin: [IMG]http://www.rockwellparts.com/rockwell-pictures/rockwell-knuckle.jpg[/IMG] If you looked at a birds eye view of the knuckles and draw a vertical line from kingpin to rear axle and then another line from kingpin through tie rod hole, the angle between these two lines is your Ackerman angle. Ideally when you do this on both sides the lines intersect in the center of your rear axle. But if you draw this same diagram with rockwell knuckles pointing forwards that is not what happens. Instead the lines intersect somewhere in front of the vehicle giving you crap steering. And this isn't just for race cars. I immediately noticed the difference just pulling out of the shop today at .5 mph. The rig turns noticeably sharper. [/QUOTE]
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Rockwells make your sac swell!
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