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Eccentrics adjust roll center?
http://forum.teamxray.com/viewtopic.php?f=47&t=13531
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Author:  rcbo [ Mon May 27, 2013 18:34:50 ]
Post subject:  Eccentrics adjust roll center?

When I use the eccentrics for the uprights and the bearing is in the lower position, do I raise or lower the roll center then?

rcbo

Author:  Hagberg [ Wed Sep 11, 2013 12:30:58 ]
Post subject:  Re: Eccentrics adjust roll center?

Raise

Author:  rcbo [ Mon Sep 16, 2013 05:26:41 ]
Post subject:  Re: Eccentrics adjust roll center?

Hi Alex,

Thank you very much for your answer but I'm a bit confused. When there was no reply in long time I e-mailed X- Ray and they actually answered "lower" :?:

Author:  Green Wing [ Sat Oct 05, 2013 12:31:00 ]
Post subject:  Re: Eccentrics adjust roll center?

rcbo wrote:
Hi Alex,

Thank you very much for your answer but I'm a bit confused. When there was no reply in long time I e-mailed X- Ray and they actually answered "lower" :?:

It's correct that the rollcenter is set lower when the bearings are in the lower position.

Author:  Roelof [ Sat Oct 05, 2013 22:00:50 ]
Post subject:  Re: Eccentrics adjust roll center?

Because there are more ways to change the roll center this would be the most difficult way...

I know drivers who only use the eccentrics to set the ride height to the size tire without affacting the geometric of the suspension or only set the wheelbase.

Author:  JamesHealey [ Thu Nov 21, 2013 08:45:58 ]
Post subject:  Re: Eccentrics adjust roll center?

Easiest way to think about roll centres is if you have the bearing or eccenter in the "down" position you're putting the weight above it, this you've raised the roll centre.

You put the eccenter of bearing in the upper position and you're putting more weight bellow that line, thus lowering the roll centre.

Author:  Green Wing [ Sat Nov 23, 2013 20:04:49 ]
Post subject:  Re: Eccentrics adjust roll center?

JamesHealey wrote:
Easiest way to think about roll centres is if you have the bearing or eccenter in the "down" position you're putting the weight above it, this you've raised the roll centre.

You put the eccenter of bearing in the upper position and you're putting more weight bellow that line, thus lowering the roll centre.

Rollcenter is a geometry-only parameter. Weight doesn't effect it. Lower axle seat means lower rollcenter if ridehight and camber remain unchanged.

The virtual extensions of both the suspension arms cross more outside and/or lower (depending on the starting point) when the axle sits closer to the lower suspension arm (lower bearing seat). This has a lower rollcenter and thereby more roll as one result.

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