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Old 01-28-2005, 04:35 AM   #1
bwco
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Default Sway bar Q w/pic

I wanna see if anyone can educate me on this one.... I know i'll get a better answer from the open forums, but I thought this is such a stupid question, I'd rather play it safe here before embarassing myself in the open forum.

I wanna know the forces that act on the entire sway bar, endlink, and lateral link bracket

Red arrows denote -- forces from the sway bar pulling up and down(towards sky or ground) on the endlink.
Blue arrows denote -- forces of the sway bar pushing or pulling (towards the left and right wheel)
Yellow arrows denote -- forces of sway bar pushing or pulling (towards the front and rear of the car)

Which force(s) is/are correct under normal circumstances of cornering ?
-- I've an answer in my mind but I wanna confirm it (it's been bothering me for months....
-- I knew all the facts about stiffer/looser bar, under/over steer, heavy duty/stock/heim joint endlink effect, spring compression/stiff bushings...etc.


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Last edited by bwco; 01-28-2005 at 04:43 AM.
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Old 01-28-2005, 11:26 AM   #2
tedski
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Main objective is up & down, in other words - red arrows

Ted
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Old 01-28-2005, 12:53 PM   #3
AllWheelDrift
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Yeah, the only way it should move is up and down, though it won't be perfectly up and down since it rotates around the mounts/bushings causing the end to move in an arc, so as it moves in the red directions, it will move in the yellow direction a small amount as well. However, all the forces should be acting in the red direction. Any movement in the blue directions is bad.
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Old 01-28-2005, 05:37 PM   #4
bwco
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So I don't have to worry about the sway bar forces pushing the stainless steel spherical bearing out of the endlinks (because of the blue arrow forces), right?

When I jack up the car on one side, I see a movement based on the yellow arrow, and the sway bar tend to pull the endlink and thus, results of the red+yellow direction.

Thanks in advance
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Old 01-28-2005, 05:48 PM   #5
AllWheelDrift
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OK, I lied. Because the latteral links which the endlinks are bolted to also move in an arc there will be a small amount of movement in the blue direction but I don't think you could get anywhere close to the forces that would be required to push the spherical bearing out of the endlinks. BTW, perrin endlinks also use spherical bearings but the bearings they use are much smaller.
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Old 01-28-2005, 07:50 PM   #6
bwco
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I've similar set up as th ones shown on the picture above

1) STI pink lateral link set
2) STI pink trailing arms
3) Custom spherical bearings endlink
4) STI 20mm rear sway bar

The spherical bearing endlinks has a listed ~5000+ lb of resistent against forces like the blue arrows. Since I'm no physican, all my predications were based upon SFU 2nd year physics standard.

The answer I got from open forums is that the endlink will only see forces like the red arrows. Nothing else !! But I kinda doubt it...
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Old 01-28-2005, 08:09 PM   #7
AllWheelDrift
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Well, the other forces are pretty insignificant so you can probably disregard them. There just needs to be some articulation to allow the link to move in those directions (which the spherical bearings provide) so that the endlinks don't bind.

In any case, the stock plastic endlinks seem to hold up reasonably well so I really think your mind can rest at ease.
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Old 01-28-2005, 08:14 PM   #8
tora
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Yes, to AWD's post, and keep in mind Billy, you drive like a girl. Maybe you need another lesson...
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Old 01-28-2005, 08:33 PM   #9
bwco
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Quote:
Originally Posted by tora
Yes, to AWD's post, and keep in mind Billy, you drive like a girl. Maybe you need another lesson...
shhhhhhhhhhhh...................
Didn't you see a granny burn out in a S2000?

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Old 01-28-2005, 08:34 PM   #10
bwco
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Quote:
Originally Posted by AllWheelDrift
Well, the other forces are pretty insignificant so you can probably disregard them. There just needs to be some articulation to allow the link to move in those directions (which the spherical bearings provide) so that the endlinks don't bind.

In any case, the stock plastic endlinks seem to hold up reasonably well so I really think your mind can rest at ease.
I've ditched the stock plastic endlinks long time ago, I'm using a custom heim joint endlinks now. Same thing as the picture provided above but with a different finishing.
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Old 01-28-2005, 08:39 PM   #11
AllWheelDrift
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Quote:
Originally Posted by bwco
I've ditched the stock plastic endlinks long time ago, I'm using a custom heim joint endlinks now. Same thing as the picture provided above but with a different finishing.
I know, I'm just saying stock works and what you've got is better so stop being a worry wart.
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Old 01-28-2005, 08:42 PM   #12
tora
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Worry wart, that's the coolest two words!
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Old 01-29-2005, 04:20 AM   #13
bwco
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Quote:
Originally Posted by AllWheelDrift
I know, I'm just saying stock works and what you've got is better so stop being a worry wart.
yeah, stock works well only if I have the stock lateral links, but I've the pink stuff that have a different position for the endlink mount. Stock sway bar should work fine, but I've a jdm sedan rear sway bar. Stock endlink should work fine, but I bought my endlink pieces by pieces and build it from scrap. I went to home depot, lots of measurements and guesstimate. Bang, went under the car and done all by myself. Well, under so much uncertainty, I'm worried about the safety of my brilliant life
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Old 02-05-2005, 08:54 PM   #14
sniece
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Hey there BWCO, I'm building up a set of heim joint front (and hopefully rear) end links as well. What size (if anything) did you have to use to space the end link out from the swaybar?

Thanks,
Steve
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Old 02-05-2005, 09:19 PM   #15
bwco
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sniece, I build it exactly like the ones from poltec.... look into the dealers' forum and u'll see. I'd a few detailed pictures of it before...

Basically, get some bolts with flat ends or some thick round washers (I'm not sure what they call them, but it's basically a spacer. Make very accurate measurements as which heim joints you should buy, then go from there and get all the necessary bolts and nuts for it. The pair of endlinks spend me less than 50 bucks canadian.
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Old 02-06-2005, 08:59 AM   #16
sniece
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Yeah, I have the joints themselves already, and I found 3/8 long x 1/2 OD aluminum spacers at McMaster Carr, but they had to be bored out to 3/8 to work. I THINK they'll be the right length, like you say, I can probably judge the size off of the Poltec pictures.

Thanks!
Stephen
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Old 02-07-2005, 05:00 AM   #17
bwco
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good luck man.... !
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