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has anone put inboard brakes on an IRS 7?
what are peoples thoughts on this? should be a good unsprung weight saving, see it on ultima's and the zcars monte carlo.
shouldn't be too hard if you are using bolt in shafts?
find suitable discs you can put between diff and shafts and bolt through, holders for calipers and your sorted?
quite tempted to so this once im on the road.
Cooling may be a bit of a problem,they will be a bit out of the way of the airflow,either side of the diff,I think you would be hard pressed to notice a difference on the unsprung weight advantage on the rear of a Indy,it would be a lot of work for little reward in my view.
might be tempted to duct some cooling air to them
Probably will Sh*g the CV's out too
Cooling would be no problem for road use.
Jag XKE, XJ6/12, XJS all had inboard rear discs. Big issues were not performance, but in serviceablity and heat.
The Jag brakes, esp the parking brake, can be a real PITA to service. And the heat was not a braking performance issue. It was the fact that it
caused increased temps on the carrier, cooking the seals and causing differential leaks.
Vented rotors and ducted air cures that issue.
My tintop has inboard front brakes and in spite of its ferocious neck-snapping performance they are splendid
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I've seen a Sierra back end with the disc's bolted between the drive shaft and output flange on the diff... should be easy to make a caliper
bracket there.
Maybe someone with a spare bolt on diff can evolve a locost upgrade???
HERE you go...
Very neat job. Bike calipers and discs. Plenty powerful and super light weight. Just the handbrake to worry about
2vc's have inboard breaks, when racing they tend to have large fins bolted to the calipers, and or ducted cooling or fans.
- It also gets interesting if the propshaft fails or comes undone! Seen that happen.
However it would indeed be possable and maybe as you say help reduce unspring mass.
Daniel
i was thinking along the lines of bike brakes 
quote:
Originally posted by dan__wright
i was thinking along the lines of bike brakes
yep that is exactly what i had in mind!
it is very tidy and hope that if i do go ahead with it it comes out half as good
[Edited on 24/4/08 by dan__wright]
would a single disc on the prop side of the diff be a no no? obv less to have do build etc but should be putting a lot of stress on the diff / drive
train i guess?
[Edited on 24/4/08 by dan__wright]
Singke disc on the prop does not work as the lighter wheel starts to spin in the opposite direction. It also overloads the halfshafts and diffs.
Landrovers have handbrakes on the prop, drag it on before stopping all sorts of banging and broken half shafts.
Regards Mark
That was my old racer, sold it last year.
The braking was very good, I did use air duct in the passengers place for cooling.
The only problem I had was the mounting of the diff to the chassis, I made it far too light.
Because the acceleration and brake forces came together at the diff mountings I should have used much heavier material.
But that should not be a problem when you build it heavier, the whole car was a little too weak for normal street use.
You could add a Wilwood handbrake caliper for SVA.
That's beautiful work, erwe! But yeah perhaps the diff mounts look a little flimsy for taking braking loads too (although it looks like you
picked up the front mounts of the diff too through those tunnel tubes - is that right? They're normally ignored). Did you actually get a
failure?
When you say the whole car was a little too weak what do you mean? The chassis looks excellently designed and made from a stiffness point of view.
Was it more issues with 'minimalist' bracketry? Anyway great work
Another reason a brake disc on the prop isn't a great idea is the prop is spinning, say, 3.5 times faster than the driveshafts - instant melted
brakes!
Liam
quote:
Originally posted by Liam
Another reason a brake disc on the prop isn't a great idea is the prop is spinning, say, 3.5 times faster than the driveshafts - instant melted brakes!
quote:
Originally posted by mark chandler
Singke disc on the prop does not work as the lighter wheel starts to spin in the opposite direction. It also overloads the halfshafts and diffs.
Landrovers have handbrakes on the prop, drag it on before stopping all sorts of banging and broken half shafts.
Regards Mark
You could use the complete rear axle assembly from a Lotus Elite/Eclat/Excel. Inboard drum brakes at least on the two early models -- not sure about
the Excel.
Inboard brakes work particularly well on a De Dion axle --- no torque reactions.
quote:
Originally posted by MustangSix
Jag XKE, XJ6/12, XJS all had inboard rear discs. Big issues were not performance, but in serviceablity and heat.
The Jag brakes, esp the parking brake, can be a real PITA to service. And the heat was not a braking performance issue. It was the fact that it caused increased temps on the carrier, cooking the seals and causing differential leaks.
Vented rotors and ducted air cures that issue.