Should rear wishbones be level with the bottom of the chassis?

Not logged in [Login - Register]

LocostBuilders » Forum » Chassis » Should rear wishbones be level with the bottom of the chassis?

MIG Welders & ARC Welders at MachineMart.co.uk

Printable Version | Subscribe | Add to Favourites

speedyxjs

-----------------------

Posts 9447
Registered 5/1/07
Location Sunny Eastbourne, East Sussex
Member Is Offline

Photo Archive Go!

Building: Daihatsu Sportrak buggy

posted on 9/3/08 at 05:15 PM

Should rear wishbones be level with the bottom of the chassis?

Iv made a frame to support my diff which the wishbones are attached to but they are a couple of inches above the bottom rails of the chassis. Does this matter or do i have to rethink it?

How long can i resist the temptation to drop a V8 in?

Ivan

Contributor

Posts 1944
Registered 9/1/05
Location Simon's Town - SA
Member Is Offline

Photo Archive Go!

Building: A wish list bigger than my bank account.

posted on 9/3/08 at 06:37 PM

Presuming you move the top wishbone mount the same amount then the main change will be in the roll center height with all it's implications.

If you don't move the upper wishbone mount to suit then everything changes - generally for the worse.

kb58

Contributor

Posts 1630
Registered 18/1/03
Location Ca, USA
Member Is Offline

Building: Mid-engine Locost

posted on 9/3/08 at 07:47 PM

The suspension pickup points are determined back during the design phase. Find the pickup points and design the chassis from there, not the other way round.

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

speedyxjs

-----------------------

Posts 9447
Registered 5/1/07
Location Sunny Eastbourne, East Sussex
Member Is Offline

Photo Archive Go!

Building: Daihatsu Sportrak buggy

posted on 9/3/08 at 08:45 PM

quote:
Originally posted by Ivan
Presuming you move the top wishbone mount the same amount then the main change will be in the roll center height with all it's implications.

If you don't move the upper wishbone mount to suit then everything changes - generally for the worse.

Sorry i forgot to mention, i am using the jag diff and bones so there is only the lower bone and the driveshaft acts as the upper wishbone.

How long can i resist the temptation to drop a V8 in?

kb58

Contributor

Posts 1630
Registered 18/1/03
Location Ca, USA
Member Is Offline

Building: Mid-engine Locost

posted on 9/3/08 at 10:34 PM

Same answer though, the arms should go where designed, not to a convenient tube nearby.

Making the bottom A-arm non-parallel to the (assumed level) bottom rails means that anti-dive is being increased or decreased.

[Edited on 3/9/08 by kb58]

LocostBuilders » Forum » Chassis » Should rear wishbones be level with the bottom of the chassis?

All content © 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [© 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.