9000rpm
|
| posted on 10/7/07 at 12:23 PM |
|
|
Front wishbone design.
My first attempt to design the front wishbone.
The uprights are sierra and copied from locost7.info. The front chassis section is close to a +4. Wishbone lengths are my own. Right height is
5". Compression travel is 2.5" and rebound is 2.5”. Measurements are in mm
Did i pass the test ? 
Normal height
Full compression
Full rebound
|
|
|
|
|
worX
|
| posted on 10/7/07 at 12:44 PM |
|
|
I would say so, CofG looks good there IMO, but what engine are you planning on using? as 127mm ride height at the front is pretty high...
Steve
quote:
Originally posted by 9000rpm
Did i pass the test ?
|
|
|
9000rpm
|
| posted on 10/7/07 at 12:51 PM |
|
|
I am planning to use a F20C which has a longish oil pan. I was originally designing for a 4inch drop but having roads worse then the moon, i opted to
design with 5 inch.
|
|
|
t.j.
|
| posted on 10/7/07 at 01:25 PM |
|
|
I pointed my lower wishbone a little bit down-wards about 19mm.
My RC is at 75 which is a little bit high.
But it is one big compromise.
My ride height is 125mm front.
I think you could raise the upper inner a little bit, which is better for your RC.
grtz
Please feel free to correct my bad English, i'm still learning. Your Dutch is awfull! :-)
|
|
|
britishtrident
|
| posted on 10/7/07 at 02:21 PM |
|
|
To be realistic work with 3.5" total suspension travel -- a transit drag link has limited articulation.
Front Rc looks a bit low
What size tyres are you planning ? if you used a smaller outer dia tyre & wheel combination it might help get the wishbones at better angles
As a rule steeply angled wishbones should be avoided
|
|
|
9000rpm
|
| posted on 10/7/07 at 04:50 PM |
|
|
quote:
Originally posted by britishtrident
To be realistic work with 3.5" total suspension travel -- a transit drag link has limited articulation.
Front Rc looks a bit low
What size tyres are you planning ? if you used a smaller outer dia tyre & wheel combination it might help get the wishbones at better angles
As a rule steeply angled wishbones should be avoided
Should the RC be low to the ground ?
I will change to a 15" with lower profile with a smaller overall dia.
|
|
|
t.j.
|
| posted on 10/7/07 at 05:57 PM |
|
|
Roll centre around 45 mm is a good start,
I personally would not go lower than that
Plenty stuff on wheel-geometry around here.
Rear roll-centre if IRS around 90 mm
Mine are 75 front and rear 100 mm.
I use 195/65 R 14 to gain bottom space
Please feel free to correct my bad English, i'm still learning. Your Dutch is awfull! :-)
|
|
|
britishtrident
|
| posted on 10/7/07 at 05:58 PM |
|
|
Front RC should be slightly lower than the rear, I would start by trying to get the Rc about half-way between the ground and the bottom of the
chassis, say 52 -65 mm
The lower wishbone should be roughly parallel to the ground (for a road car usually inner end very slightly higher than outer)
[Edited on 10/7/07 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
britishtrident
|
| posted on 10/7/07 at 06:07 PM |
|
|
If you take a good look at the front suspension of 1960s Formula 1 or 2 racer (for example Lotus 33) you should get an idea of basic practice.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
9000rpm
|
| posted on 10/7/07 at 10:52 PM |
|
|
I did search for the lotus 33 as mentioned and found a good reference of the wishbone angles. After some home work i determined the upper is around
15deg and lower is 5deg (approx).
http://www.vsrnonline.com/Mags/MC/Vol1/V1N6/MC_V1N6_p283.jpg
|
|
|
