cloudy
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| posted on 16/8/06 at 03:38 PM |
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Shock mount positioning
I've come to the point of putting the the top mounts for all the shocks on my scratch build, I've heard various figures like the car
should stand at an inch of suspension travel. Are there any rules of thumb or methods I can use to get the correct mounting locations...
I think i'm going to try and aim to have all wishbones level at rest...
James
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nick205
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| posted on 16/8/06 at 03:49 PM |
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Check my post in this thread and get a copy of the book 
CLICK HERE
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kb58
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| posted on 17/8/06 at 12:15 AM |
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"In general" at normal ride height with all fluids and driver aboard, you want the shock about half compressed, or maybe a bit less, so
40-50%.
Oh and you should have "about" 3" of *wheel* travel before hitting the bump stop.
All these numbers are subject to great argument, but it's working fine on my car. It very much depends what road surface you drive on and how
firm a ride you can stand.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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cloudy
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| posted on 17/8/06 at 02:08 PM |
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thanks kb58, just the info I was after 
James
www.warnercars.com
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cloudy
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| posted on 25/10/06 at 12:57 PM |
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Sorry to reopen this one, but what clearance do most sevens have when right down at bump stops on the suspension?
James
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cloudy
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| posted on 26/10/06 at 04:12 PM |
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anyone?
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flak monkey
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| posted on 26/10/06 at 04:15 PM |
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What clearance?
Ground clearance i assume... most have it set between 3" on track and up to 6" for the road at ride height. What that would give at full
bump i dont know.
David
Sera
http://www.motosera.com
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cloudy
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| posted on 26/10/06 at 05:33 PM |
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sorry. yes its ground clearance on the bump stops i'm after....
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cloudy
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| posted on 30/10/06 at 10:21 AM |
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anyone? even a guesstimate?
Basically i need to know whether i hit the bump stops with the chassis just clearing ground or whether i need to be and inch or two up.....
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cloudy
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| posted on 31/10/06 at 09:34 AM |
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 I presume this is harder for people to check than I thought
James
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Marcus
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| posted on 31/10/06 at 11:58 AM |
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On the bumpstops, my sump barely clears the ground.
Guess that means the chassis, at that point, is about 1 1/2" from the floor.
Marcus
Because kits are for girls!!
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cloudy
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| posted on 31/10/06 at 01:31 PM |
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 Many thanks Marcus - that's all I needed to know, i'll get those mounts welded in tonight 
James
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kb58
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| posted on 31/10/06 at 02:37 PM |
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What you're asking has no black-and-white answer. It all depends on your car's application, what the roads are like in your area, if you
have to drive over fallen debris, speed bumps, pot-holes, railroad tracks, driveways...
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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cloudy
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| posted on 31/10/06 at 10:04 PM |
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OK I've welded them on, it gives about 1" clearance with the bumps fully squashed and 2" as it starts to hit the stops
This gives just over 10cm of suspension travel, with the car resting at about 6cm, leaving 4-5cm of upwards travel.
am I going to get away with this based on the photo + measurements above or do I need longer shocks?
James
[Edited on 31/10/06 by cloudy]
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Uphill Racer
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| posted on 30/11/06 at 08:23 PM |
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Pickup point for coilover on chassis will bend.
NEVER feed loads into the chassis like that.
Wishbone pickup points in tube if not braced (triangulated) will distort chassis.
Sorry for the bad news, but better now while it can be corrected.
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Schrodinger
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| posted on 1/12/06 at 10:42 AM |
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I think you will find that the angle that the shock is at will also give you problems with a falling rate spring IIRC the spring should be as near 90
deg. to the suspension travel as possible and by the looks of yours it's about 45 degrees
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Peteff
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| posted on 1/12/06 at 11:32 PM |
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Weld a bar across your top wishbone and gusset a top bracket wherever you want it on the chassis member then run your shock wherever you want it to
make the ride height right. Sorry for the rough drawing but I hope you see what I mean. edit here:- or if your dampers are 12" open 9"
closed get some longer ones and I'll take the old ones at a greatly reduced rate.
[Edited on 1/12/06 by Peteff]
 
Rescued attachment suspension.jpg
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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t.j.
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| posted on 2/12/06 at 08:53 AM |
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Hey,
I'm agree that the chassis will bent at the top mounting pos.
I want to argue that the coil-over in front of the car (most) are also not 90 degr is placed.
If you want to place the coil-over as suggested by pete you have to make a strong wishbone.
I like the idea to keep the coilover as close as possible to the upright.
In this case i would search for longer coilover and made a lot of enforcement on the upper coil-over mounting try to get the forces in the coilover al
in line with the forces into the chassis.
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