hiya all,

i have been having a search for info regarding seating and found a post that stated that to fit a certain type of seat in a Book chassis you needed to reduce the width of the seat - fine and fully understandable.

The bit i did not understand is why the drivers seat had to be made narrower than the passengers, is the prop shaft tunned supposed to be running off centre? thus making one compartment narrower than the other?

I also noticed that my Formula 27 had a narrower drivers tub than the passengers but some 4cm at the rear bulkhead? is this normal?

or did the guy who built mine just have a fat arsed woman cheers and beers

colin

The fixed axle diff is offset, so the propshaft flange is an inch or two towards the driver.

As the tunnel is only a little wider than the flange, it has to be widened on the driver side a bit.

Hope this helps,

David

Well bugger me, i didnt know that, i just though mine had been put together by a complete clown.

i am knocking about the idea of converting it to IRS, does this mean that i will need to A) mount the independent diff off center to line up with the tunnel, or B) square up the tunnel so i can mount the diff on the centre line and avoid having to guff about with drivers side rear wishbones being a different length to passenger side ones?

Colin

to convert to irs the diff is mounted centrally in the car and the drive shafts are different lengths. The wishbones are normally made same length and pick up points are equal distance from the centre line

Tim

Tim,

How cant the diff be mounted centrally and still use different length drive shafts?

colin

the prop flange is mounted centrally and the drive shaft mounts on the diff housing are different from the central point of the diff. also if you look at a irs set of drive shafts you will see they are different lengths as standard


have a look at this in vipers archive for visual aid

http://forum.locostbuilders.co.uk/xmb/photos/cgi-bin/showpic.pl?rear1.jpg

[Edited on 1/9/03 by timf]

Tim,

Thanks for the piccy, all clear now. Only concern is that i still couldn't use an independant diff mounted in the middle of the tunnel centre line because the whole diff assy will be closer to the drivers side (purely due to tunnel angle) and the short shaft is on the passengers side, making it too short and the long one too long, unless i could swap them over?

Hope this made sence, it did to me when i was writing it!.

Colin

colin

have a look at the pic again the offset side is rear ward of the top mount which should be in the area the current diff. if the prop flange is mounted in the centre line of the chassis (Not tunnel) then there shouldn't be a problem.

Tim,

It looks like the centre casting line on top of the diff is in the centre of the tunnel -correct?

My issue is that the centre line of the tunnel is not the centr line of the car, therefore if i mounted the riff flange in the centre of the car it would foul the inside of the tunnel, if on the other hand it was mounted in the centre of the tunnel the shafts would be too short on onje side and too long on the other - Correct?

or am i falling off my steep learning curve!

Colin

quote:

---

Originally posted by colmaccoll
Tim,

Thanks for the piccy, all clear now. Only concern is that i still couldn't use an independant diff mounted in the middle of the tunnel centre line because the whole diff assy will be closer to the drivers side (purely due to tunnel angle) and the short shaft is on the passengers side, making it too short and the long one too long, unless i could swap them over?

Hope this made sence, it did to me when i was writing it!.

Colin

---

quote:

---

Originally posted by colmaccoll
Tim,

It looks like the centre casting line on top of the diff is in the centre of the tunnel -correct?

My issue is that the centre line of the tunnel is not the centr line of the car, therefore if i mounted the riff flange in the centre of the car it would foul the inside of the tunnel, if on the other hand it was mounted in the centre of the tunnel the shafts would be too short on onje side and too long on the other - Correct?

or am i falling off my steep learning curve!

Colin

---

Thanks chaps, info much appreciatedlooks like a bit of chassis trickery and a bit of re panneling inside the car is required.

It makes it a bit of a bigger job than just making wishbones and a diff cage now

Thanks again.

Colin