NS Dev
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| posted on 23/3/04 at 12:02 AM |
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Bias brake linkage (balance bar)
I have had conflicting reports on whether a balance bar braking system will pass the SVA test. It says it cannot be adjustable easily, or words to
that effect. If I set it, then make spacers for either side of the threaded rod, take it all apart, fit the spacers, then SVA it, that should pass
shouldn't it? It isn't technically adjustable because you have to dismantle it completely to adjust it.
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jimgiblett
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| posted on 23/3/04 at 09:17 AM |
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I was advised to use a roll pin.
After checking the bias locks up the front wheels before the rears I drilled a small 2mm hole through one of the clevis pins and threaded rod then
tapped in a small roll pin.
This is a non destructive mod that certainly passes the criteria of not been adjustable with my SVA inspector.
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craig1410
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| posted on 23/3/04 at 01:02 PM |
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I'd make sure the rollpin was cut to the right size to make it flush at both ends and thus "harder to disassemble". Also,
don't be tempted to use a split pin as these are not acceptable according to the March 2004 amendments to the SVA manual. Seems a bit daft to
me, haven't they heard that rollpins can be drifted out almost as easily as split pins?
Cheers,
Craig.
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Viper
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| posted on 23/3/04 at 06:24 PM |
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You are allowed to use a bias bar, the stipulation is that it cannot be adjusted beyond the worst case condition,
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NS Dev
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| posted on 23/3/04 at 07:16 PM |
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I have been thinking about it and surely if I get it all set up, measure the distance from the spherical to the clevis each side and make accurate
spacers, then remove the clevises, slide the spacer tubes on and put the clevises back, before winding in the master cylinder pushrods, then this
should be ok. It is impossible to adjust in situ, requiring complete dissasembly, while avoiding putting a hole in the highly stressed balance bar
itself?
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Viper
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| posted on 23/3/04 at 08:42 PM |
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I am at a loss as to why anyone would go to the trouble and expense of fitting something that is adjustable just to make it un-adjustable???
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NS Dev
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| posted on 23/3/04 at 10:06 PM |
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I didn't say the spacers would be left in place after the test!!!!
Just spoken to my mate who runs Ultima Sports Cars, they use locknuts on the bias bar with no probs at the Nottingham centre.
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Markp
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| posted on 23/3/04 at 10:52 PM |
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I went to Nottingham
I needed to adjust the bias bar slightly and told him I will drill the hole through the bolt and bias bar to accept a split pin there and then to lock
it all together. He said as long as the lock nut was tight up that it would do
It was almost a year ago though
Mark.
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craig1410
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| posted on 23/3/04 at 11:05 PM |
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The draft SVA manual states that:
"Devices that allow further adjustment, eg lock nuts/adjustable stops, split pins, will not, in isolation be considered as capable of preventing
further adjustment to a "worse" condition. (A roll pin will be considered acceptable providing it penetrates the full diameter of the
component.)"
This seems to rule out lock nuts and split pins ans specifically permits roll-pins. There are enough reasons that an SVA inspector can fail a car
without tempting him to fail you on one more thing... I'd use a roll-pin if I had a bias bar.
HTH,
Craig.
[Edited on 23/3/2004 by craig1410]
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