johnd
Part of things
Posts: 839
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How easy is it, or is it even possible to add a bit of camber on a 4ha axle?
No idea how to go about it but would love 1.5-2 degrees of negative
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Two ways of doing it that I know of. You can get 0.5 to 1 degrees by laying some heavy weld on top of the axle tubes and allowing them to cool. The contraction will give you a bit of camber, and toe if you want it. The half shaft splines will stand a small angle of offset. If you want more camber, or some adustability then it's a major reengineering task. John Wilson Racing will do it, he's developed it for the fully floating axle for his MGB V8 racer.
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V8 MGB GT sprint and track
V8 Ford Pilot Woodie project
1971 Early Bay VW camper
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1.5 to 2 degrees is quite a bit, if you want it to last any time you are going to have to get some sort of cv joint onto the outboard end of the halfshaft (perhaps modify the front axle off of some sort of 4x4?)
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Talk to BPA Engineering in Hampshire
01256 895151
Tom
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johnd
Part of things
Posts: 839
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I don't want to spend £££ - weld sounds a good bet, any pics of what you mean
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Camber can be added on a solid rear axle with heat applied to the top side of the axle housing with an acetylene torch till cherry red, let it cool. Once it cools it will shrink that top side and create camber  |
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johnd
Part of things
Posts: 839
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Take it theres no exact science
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No science at all with that method, you could end up with totally different camber each side........
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Mar 18, 2016 18:14:45 GMT
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Weld Bead is the easiest, and just be prepared for reduced bearing life
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gazz81
Part of things
Posts: 842 
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Mar 18, 2016 19:53:54 GMT
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Get a pair of these!  |
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Mar 19, 2016 20:11:26 GMT
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^ Genius!  Looks like an easy way to get instant track increase and camber adjustment, smart idea   |
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Mar 19, 2016 21:21:35 GMT
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make sure where you make the bend, either by heating or welding, it is as near to the diff as possible.
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gazz81
Part of things
Posts: 842
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Mar 19, 2016 21:30:12 GMT
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So been thinking about this and I cant get my head around how you can effectively put a curve in the axle tube, whilst still allowing a straight half shaft to run through it? Surely the stresses at each end must be immense.
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Mar 19, 2016 21:44:27 GMT
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its not a curve its a kink. if you make the kink at the bearing end it'll try to bend the halfshaft at the bearing and will wear or snap very quickly. making the kink at the diff end makes the tube lean forward or upward (depending where you put the weld) and the halfshaft will be in line with the bearing and just lean slightly at the diff where there should be enough play in the diff splines to allow a bit of articulation.
obviously there will be a bit of accelerated wear which doesn't matter in a race car as the axles are rebuilt quite often. the more camber will create more wear at the diff splines. normally you only want half a degree max camber or 1/8th toe in because a solid axle will stay pretty much parallel to the ground as the car leans over. where as a car with independent suspension when it leans will have the suspension lean with it requiring more camber to compensate.
HTH
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