One for the RV8 boys.
Which plans are most suitable for the RV8.
The +4 or the +442 or is there another alternative for the SD1 engine with a manual box.
Also what is the best back axle to use.
Ray...

Ray,
I think the 7+4 is the best as it is more popular AFAIK than the 7+442 and hence you can get better advice and benefit from shared knowledge.

For the back axle I'd go with de-dion using the GTS tuning de-dion axle design. This allows you to use a good strong Sierra LSD diff rather than hunting around for a suitable live axle or going to the complexity of an IRS setup. De-dion also has a reputation for good start line traction which will come in handy with the V8 pushing you along.

Check out my website where I explain a bit more about my own build. There are many photo's which may be of interest.

I should point out that the GTS de-dion axle is designed for a standard width chassis so you would probably need to design a different mounting arrangement (like mine for example) to allow it to be fitted to a wider chassis.

HTH,
Craig.

[Edited on 5/4/2004 by craig1410]

I am doing 7+4 with rv8 and will be using GTS de dion. I have spoken to darren and need to get in touch with him again to find out if his fabrication guy is prepared to change the jig to make 7+4 width axles (would mean moving the mounting "ears" out).

If he's not, darren says he can supply the welded up bar and hub carriers with the ears separate for me (you) to weld on ourselves.

A Cortina axle is exactly right for a +4, I have used a Capri in a book chassis, but if the Dedion option was available at that stage of the build, I would have had it like a shot. Much lighter than the ball breaking salisbury (atlas)!!

quote:

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Originally posted by Mark Allanson
A Cortina axle is exactly right for a +4, I have used a Capri in a book chassis, but if the Dedion option was available at that stage of the build, I would have had it like a shot. Much lighter than the ball breaking salisbury (atlas)!!

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Hi,
Not sure which is which but on one the diff is removed through a cover plate on the back of the diff casing and on the other the diff comes away as a subassembly on the front of the axle assembly. I'm sure someone will post the details or correct me if this is an oversimplification.

Cheers,
Craig.

What axle ratio would you recommend to run with the sd1 manual box.There is a choice of Sierra 2.0 ltr auto,Cort 4.11 or 3.75 or XR4i.

Put you details into this calculator and see where your top speed is

Yes i know about the calculator,i used it for my pinto where i knew all the variables but my brother has agreed to make a chassis for someone using RV8 but we don,t have the info on the gear ratios. I was hoping someone could stear us in the right direction with the limited information we do have.

Its not 'the calculator', its my calculator, and it has the gear ratio's for a 3.5 V8 Rover box added to it - all you have to do is add the tyre size, play around with the diff ratio until you have the top speed in any given gear you want

Sorry i,ll find out what tyre size he wants to use and what he wants the car to do(top speed,acceleration)and i,ll use your calculator to help him chose a back axle.
Thanks loads Ray...

Nice one Mark! That's really cool.

It's especially nice to see I'll be able to do 180mph with my Pinto!

Cheers,

James