It seems a very common question "Can anyone give me drawings for a IRS Chassis??". Correct me if I'm wrong but Mr McSorley seems everybodies best source for this information....? Most people seem to be copying either Tigers, Avons etc but oddly, not may people seem to mention Westfield? It is possible to calculate/copy most of the information with regard to Roll Centers etc but any information needs to be quoted on a "Control" Rear Hub?
What seems to be the most successfull front hub, the apparently rare Escort Mk1 or 2 front hub?
It is my intention to build a IRS chassis, adjustable top inner wishbone pickups on the front and rear (to try to iliminate the guesswork!?) and probably use a Pinto/Zetec on carbs for approx 150Bhp. The car will only be used on the Track and no road use will be seen - hence a very simple ancillary set-up with limited factors to go wrong.
All of my choices are going to stem from availability from the scrapyard and don't want to build a new chassis relying on parts which are becoming hard to find. Hence the Sierra/Granada Diff etc.

Anyway, any help would be appreciated.

the front hubs from an escort cannot be used.

the default is cortina ones - granadas of the same vintage can also be used, but will be 5 stud.

Sierra hubs can be used - companies are out there that can sell wishbones and adaptors for the strut to enable this.

There are NO common drgs around for IRS. You are pretty much on your own there - if Jim does some, it will solve a lot of peoples problems.

Many on this group have superb handling cars using a std beam axle. Anything other than std axle adds a lot of time - from one who knows!

If you are building a car for the track, why not build it to 750MC rules so you could enter it in the series?

atb

steve

Many people with IRS donors build a de Dion rear suspension. Acts like a live axle but has low unsprung weight and makes use of the donor parts without a subframe. It's some work but less than IRS, IMO. Phil Rowe documented his build very nicely:

http://au.geocities.com/phil1rowe4/rear.html

Pete B.

P.S. Have seen it said many times that there's a world of difference in ride and handling between a typical production solid axle and one located with 5 links and sprung with coilovers.

Even with crap lolo shocks it still sticks like glue and breaks away predictably. I was doing 70 down a dual carriageway with a roundabout at the end the other day when a Corsa full of baseball caps passed me at about 90, the cheeky devil waited for me at the roundabout. I can still see his mates laughing at him when I went round the outside of him and accelerated round the third exit, not that I condone that kind of behaviour.

yours, Pete