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Old 2006.03.04, 08:58 PM   #1
Spoon
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Unhappy Bummed: I broke a knuckle

I was setting up for some Mini-96 Time trials and I lowered my AWD to see how it would handle. Unfortunately I used the Spring spacers instead of the suspension limiters and the car was too low. This made the knuckle sit pretty high up from the rear toe bar. When I put the car into reverse, I clipped the wall.

Since I have the 350 white body on the car, the rear was a little exposed. I heard a crack and my fun with the AWD is over for now.

Fortunately, I ordered some camber knuckles just to try them out and they should be here early next week.
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Old 2006.03.04, 09:01 PM   #2
arch2b
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talk about timing good thing you ordered those knuckles
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Old 2006.03.04, 11:12 PM   #3
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Okay, so how does the height affect the vunerability of the knuckles?
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Old 2006.03.05, 04:15 AM   #4
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Height not the issue

Quote:
Originally Posted by Wavy
Okay, so how does the height affect the vunerability of the knuckles?
Regardless of the height I found that the knuckles well either be bent or broken with a hard enough impact. That is why I bought PN Racing Aluminum ones to prevent it from happening again. Car runs great with them since they have Delrin shafts on the top and bottom suspension action is S M O O T H.
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Old 2006.03.05, 09:00 AM   #5
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Quote:
Originally Posted by Wavy
Okay, so how does the height affect the vunerability of the knuckles?
In engineering speak it's a longer moment arm.

Translating this toa real world example...

Imagine clamping a pencil to a desk and letting it hang about 6 inches off of the edge.

If you grab the pencil 1 inch away from the desk and try to break it, it's going to be difficult. If you grab it 6 inches away from the desk and try to break it, it's going to be pretty easy. You can generate more torque with the same amount of force because you have a longer lever.

Maybe it would have broken either way but I think making it too high certainly helped.
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Old 2006.03.05, 09:06 AM   #6
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did you order the 3racing or pn alloy knuckles?
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Old 2006.03.05, 09:59 AM   #7
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Quote:
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did you order the 3racing or pn alloy knuckles?
I actually just got the Kyosho plastic camber knuckles...1.5* and 3.0*

I don't know how I am going to like camber and the PN knuckles are something like $20 a pair. I figure I'll get the setup that i like and maybe get those PN knuckles to get rid of that stiction problem. (I think it's the PN ones with the delrin shafts)
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