ashtal
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| posted on 29/9/06 at 04:49 PM |
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+442 with irs !?!
Does anyone know if the rorty IRS can be changed to fit the +442 chassis. If so is how would i go about getting this info ?
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macintosh
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| posted on 29/9/06 at 04:54 PM |
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quote:
Originally posted by ashtal
Does anyone know if the rorty IRS can be changed to fit the +442 chassis.
Good question, thats what I would like to know. I'll be just more specific : wich part I have to widen, central part or wishbones?
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meany
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| posted on 29/9/06 at 06:30 PM |
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seeing how the rorty plans are for standard sierra track.
i have left the centre part alone and just extended the width spanning members,
and also centalised the vertical tubes on the very rear part...i think..lol
this means your chassis sides are 2 inches closer to the rear hubs than a book width chassis.
hope all that made sense
[Edited on 29/9/06 by meany]
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kb58
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| posted on 29/9/06 at 09:43 PM |
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quote:
Originally posted by meany
i have left the centre part alone and just extended the width spanning members,[Edited on 29/9/06 by meany]
Doing so will lower the roll-center, which may or may not be an issue.
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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kb58
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| posted on 29/9/06 at 09:47 PM |
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Hey macintosh, what's that car in your avatar?
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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TheGecko
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| posted on 30/9/06 at 01:10 AM |
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quote:
Originally posted by kb58
Hey macintosh, what's that car in your avatar?
It's an Elfin MS8 Clubman. See http://www.elfin.com.au/flash/clubman.aspx or
http://carwallpapers.hu/hatter.cfm
?kepsorid=2004%20Elfin%20Clubman%20MS8&tipusid=Clubman&markaid=Elfin for lots of BIG pictures.
Dominic
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ashtal
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| posted on 30/9/06 at 01:17 PM |
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So no exact mesurements then ! 
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meany
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| posted on 19/11/06 at 05:38 PM |
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quote:
Originally posted by kb58
quote:
Originally posted by meany
i have left the centre part alone and just extended the width spanning members,[Edited on 29/9/06 by meany]
Doing so will lower the roll-center, which may or may not be an issue.
please educate me on this.
im a complete novice with this.
this wishbone dimensions are unchanged, ergo the pivot points havent moved, only the chassis is wider.
[Edited on 19/11/06 by meany]
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dnmalc
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| posted on 19/11/06 at 08:10 PM |
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Gents
I have a spread sheet that details how the roll centres change as you play with the set up of Rorties design if you e mail me on
d_n_malcolm@yahoo.co.uk I will send it to those interested
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meany
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| posted on 21/11/06 at 07:23 PM |
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YHM
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3GEComponents
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| posted on 21/11/06 at 09:42 PM |
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Macintosh, you don't have to widen any part of Rorty's suspension, the bit that changes is where the sides of the chassis are.
Rorty's plans are for a standard Sierra width rear track, if you are building a +4" chassis, the outer rails of the chassis will be
2" closer to the wheels each side, than with a "book" chassis.
Check the plans, the extra width is in the area where you sit.
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hillbillyracer
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| posted on 21/11/06 at 10:56 PM |
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Glad this has come back to the top, I might have missed it otherwise.
I'm going to use the +442 plans but havnt decided between De Dion or IRS yet. As I understand what has been said here the alterations for IRS to
the back of the +442 would be the same as those to a book chassis. The extra width just means the body sides are closer to the wheels but there is no
other real difference?
As regards roll centre etc, where can I find out what effect it all has, & how to change it & use it to advantage?
I have Staniforth's Competition Car Suspension book but find it a bit heavy going.
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kb58
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| posted on 22/11/06 at 01:08 AM |
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Oooo, that was the very book I was going to recommend, since it's not too, uh, heavy...
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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hillbillyracer
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| posted on 22/11/06 at 07:31 PM |
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Ah, shown myself up there then havnt I!
I've been through the book but I aint much the wiser. He tells you how to work out where the roll centre is but he doesnt really tell you very
well what the effects of the roll centre are, & why it's better to have it higher or lower in whatever circumstances you happen to have. The
book pretty much assumes you are dealing with a single seater, I know the principles are the same but it doesnt help. I work on single seaters every
day but they usually have John Deere or Massy Ferguson along the bonnet so it aint much help 
The problem with me is I learn best "hands on" & also that I dont just do what I'm told, I like to know & understand WHY I
have to do it.
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Fred W B
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| posted on 23/11/06 at 05:44 AM |
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I haven't seen it explained better than Staniforth does anywhere.
Cheers
Fred W B
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whittlebeast
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| posted on 23/11/06 at 12:15 PM |
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Try this Excel sheet. It is based on the Staniforth calcs. It assumes that your chassis is plenty strong. Sorry but a book chassis is not strong
enough.
http://www.ncs-stl.com/Files/ChassisCalcsPublic.xls
AW
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hillbillyracer
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| posted on 23/11/06 at 07:31 PM |
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I've looked in the index of Staniforth's book & roll centre is only listed on 3 out of the 230 odd pages so it isnt excactly written
through the book like a stick of rock. To be fair I dont really find it heavy going, it just seems like it when you cant find what you want. I'm
not saying the book isnt any good, he knows his stuff & it will have been a great help to many people.
I've just started reading the Costin & Phipps chassis book at the moment & found a better explanation of it there.
Thanks for the help anyway folks & sorry for jacking the thead.
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Uphill Racer
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| posted on 30/11/06 at 07:39 PM |
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The calc's are David Goulds,and really helpfull. I put them into exel a few years ago, but there are if I remember two printing errors in there.
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