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Old 08-29-2005, 06:28 PM   #1
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Default BK 1 UNIVERSALS

Hi, can some one please confirm the parts required to fit universals to the xxx BK1 ? Are there parts available to specifically do this or do you have to use the BK2 parts ? any help appreciated thanks...
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Old 08-29-2005, 06:42 PM   #2
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Default BK1

are you just lookin for the universals for a bk1. or are these parts going on a bk2.

if for the bk1, i am pretty sure three parts, losa 3013,3014,and 3015.

if your using the old trans on the new car i would have to double check.
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Old 08-29-2005, 09:30 PM   #3
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hi vic, they are to be fitted to a standard BK1, not a retrofit conversion
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Old 08-29-2005, 11:06 PM   #4
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Jim,
The BK1 Axle and Pivot would be the same.The only thing different would be the dogbone itself which is LONGER on the Bk1.
Due to the longer outdrives on the Bk2 the Dogbone is Shorter.

If you need a set of Universals for the Bk1 I can send you a set for like $18.00 shipped.

They are used but in good condition.

Email me at [email protected]

Why do they use them?The axis is closer to the outdrive which yields better sidebite..

Les
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Old 08-30-2005, 07:06 AM   #5
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Quote:
Originally Posted by TexRacer
Jim,
The BK1 Axle and Pivot would be the same.
The offset on the spacer of the BK1/XXX axle is .100, Whereas the offset on the spacer of the BK2 axle is .150, pretty big difference. Make sure you get the right peice.
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Last edited by Nick111; 08-30-2005 at 01:02 PM.
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Old 08-30-2005, 11:34 AM   #6
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Quote:
Originally Posted by TexRacer
Why do they use them?The axis is closer to the outdrive which yields better sidebite..

Les
You lost me there Les-can you explain this in more detail? Thanks!
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Old 08-30-2005, 01:00 PM   #7
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The "elbow" or bending point for lack of a better word, is farther towards the center of the car. On a CVD, You notice the cup is very close to the axle bearing ( .275 ). But on a Universal, the cross bearing is closer to the outdrive, or farther from the axle bearing ( .425 from center of cross bearing ). I can't explain the geometric reason behind more sidebite, but the difference in the "elbow" is noticable different.
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Old 08-30-2005, 02:08 PM   #8
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I know that universals are more efficient,but I never considered that the spacing of the axis could be a part of it.I like the old double universal plastic slider axles and will use them whenever I can.I know that cvd's will want to straighten out under load and that can induce a sort of "false" roll stiffness(not induced by the suspension).I thought it was more a matter of there being only one pivot axis on each end,which will make the wheel speed up and slow down more through each revolution,where if there are 2 axis that will be cut in half,and if there are 2 axis on the outdrive it will be cut in half again.And since the pivot pins in the axle side of a cvd are so small the pressure at that point will be greater than on a universal with more and larger pins.I know that axle plunge can play into all of this too.Is the spacing of the axle pivot to the hub a way to manipulate this? This is probably all small differences that will not show up with my poor driving skills,but it's still facinating.
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Old 08-30-2005, 04:32 PM   #9
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Thanks for the input guys, I was planning to use the uni's
as a way to " loosen ' the rear end. I thought they gave less bite.am I on the wrong track ??
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Old 08-30-2005, 04:41 PM   #10
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Less forward bite, yes you are correct. But more sidebite. With the bk1/xxx, CVD's I think handled better, but with the new bk2 the universals are just flat out better.
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Old 08-31-2005, 06:40 AM   #11
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So let me get this straight. CVDs give you less sidebite and Dogbones offer you more sidebite?

What exactly is sidebite?

Sean
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