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Post by enigmas on Mar 22, 2008 8:49:23 GMT
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Post by Phil Nottingham on Mar 22, 2008 9:57:51 GMT
Neat - what are the disks, hub and calipers off?.
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Post by enigmas on Mar 22, 2008 14:09:16 GMT
Mitsubishi Magna disks (low hat) if I recall correctly?, the calipers are PBR HQ Holden (early 1970's...Aussie product and still used quite a lot in motor sport). The hub is P5 Rover with the back of the flange and hub cleaned up on a lath. Yet to come is the adapter between the disc and the hub. The current view is to illustrate the relationship of components. Although it looks like a straight bolt up affair there's already been quite a bit of engineering done. The caliper mount comes close but needed 1 hole welded and then moved slightly to fit the rover upright. The hub (temporarily) locates the rotor in a sized machined hole (in the rotor), this is what allows the disc to fit over the hub. The caliper is temporarily bolted in place and the caliper piston activated (with grease) to lock the rotor in position over the hub. From this point accurate measurements can be taken for the rotor to hub adapter.
Fortuitously, the rotor diameter and the caliper height are perfect (no machining required).
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Post by dorsetflyer on Mar 22, 2008 15:13:31 GMT
Unless its an optical illusion, it looks as though the disc is at least twice the thickness of the normal steel disc, and its ventilated too.
I've often thought what a good idea it would be if there was someone who could produce replacement ventilated discs for our cars.
I know that there is a company in Poole, Dorset that is the largest producer of discs in the UK and I think Europe, so i doubt that they would be interested in the small volume we would be needing.
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Post by Ken Nelson on Mar 22, 2008 18:36:35 GMT
Looks like a monster disc and caliper, and nicely machined-do you use the Rover for racing or rallying?  |
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Post by enigmas on Mar 22, 2008 23:50:12 GMT
Dorsetflyer the disc is about twice (.950") the normal thickness. There is a company in Australia called DBA (Disc Brakes Aust) that manfacture discs of all types and some special stuff for "common" cars like MGBs...i.e., solid discs, but drilled and slotted for extra performance...cooling. Unfortunately the volume for P5s is too small for them to bother.
As for the standard brakes, although they were probably remarkable in the 50's when they were first developed, they leave a lot to be desired in todays traffic and motorway driving. These discs are purchased from this company but are currently undrilled apart from opening up the centre hole. I'll post more specific photos of the components as the project progresses and also my working diagrams so that the relationship of components can be seen.
Ken, I don't use the Rover for racing but I do use it daily (approx 300 kms each week) and I do drive it quickly...quite a bit of highway use, and the brakes really are marginal (in todays conditions) especially with a bit of added weight in the vehicle.
I've driven a club member's vented disc-braked P5 sedan and the braking is much improved especially in the manner the brakes "bite-in" when the pedal is applied.
This last improvement will give my vehicle 4 wheel disc brakes.
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Post by Roy of the Rovers on Mar 24, 2008 15:00:16 GMT
On a similar vein to this does anyone else remember the club article written by Graham Rigby which quite simply put SDI vitesse brakes on his P5B convertible. That ended up with vented discs but I can't remember if the calipers were used as well.
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Deleted
Deleted Member
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Post by Deleted on Mar 30, 2008 12:48:09 GMT
As for the standard brakes, although they were probably remarkable in the 50's when they were first developed, they leave a lot to be desired in todays traffic and motorway driving. I have fitted "Green Stuff" pads from a company called EBC in my reconditioned calipers (Classicar Automotive, see separate thread) and it stops on a sixpence now. Green Stuff also has an advantage in that it doesn't degenerate into the usual black dust that copper based materials do. |
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Post by Phil Nottingham on Mar 30, 2008 16:10:40 GMT
If teh P brakes are proper;y set up they are more than adequate in today's traffic conditions in UK at least. If you thinks yours are not up to modern car standards, ABS excluded, they require looking at
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Post by enigmas on Mar 30, 2008 22:09:12 GMT
Phil the brakes are 50's technology and were probably amazing in their day when most vehicles only used drum brakes. The P5 is a heavy car and for quiet driving around suburban streets they're fine. But add any extra weight to the car (as well as some fast highway driving) and they become marginal. The solid discs do not shed heat very well nor is the pad area very great by current standards. A ventilated disc and a caliper using pads of greater surface area easily outperforms the P5 brakes. I've also fitted rear discs to my vehicle removing a lot of unsprung weight and the necessity for constant adjustment. If anyone has a P5 fitted with uprated ventilated discs try and cadge a drive you'll be amazed at the difference.
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Post by Kev on Mar 31, 2008 6:33:43 GMT
As for the standard brakes, although they were probably remarkable in the 50's when they were first developed, they leave a lot to be desired in todays traffic and motorway driving. I have fitted "Green Stuff" pads from a company called EBC in my reconditioned calipers (Classicar Automotive, see separate thread) and it stops on a sixpence now. Green Stuff also has an advantage in that it doesn't degenerate into the usual black dust that copper based materials do. The Greenstuff pads are a bit expensive aren't they? Big Kev. |
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Post by Kev on Mar 31, 2008 13:25:24 GMT
On a similar vein to this does anyone else remember the club article written by Graham Rigby which quite simply put SDI vitesse brakes on his P5B convertible. That ended up with vented discs but I can't remember if the calipers were used as well. I think Graham Rigbys mod envolved a bit of machining to get it all to fit.Looked very good though. Big Kev. |
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theroveringmember
Rover Fanatic
P5B Saloon - P4 110 - P6B x2 - 2200TC - 2000TC (S1) 2000SC........How Many Is Too Many?
Posts: 446
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Post by theroveringmember on Apr 11, 2008 7:24:23 GMT
I had 3 passengers & a trailer hitched a few years back & down a very long, steep Devon hill suffered alarming brake fade. The brakes were a'smoking & a'smelling by the time we got to the bottom. Exceptional circumstances though so I leave the radical mod's to the engineers among you. If a kit emerges then we'll see.
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Deleted
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Post by Deleted on Apr 12, 2008 18:26:38 GMT
We have got some very steep hills down here. On a long steep decent I usually put the car in 2 or even 1 if the hill is bad enough. This takes the load off the brakes.
I tend to agree with Phil, the brakes are adequate if set up properly and you don't drive in the outside lane at 80 a couple of feet from the car in front as per most drivers these days. As I've said before, I drive my car for my own enjoyment not trying to outdrive or outmanoeuvre the 99% of motorists who just want to get from A to B asap.
I just can't see the point of all the work involved in uprating but I suppose some might think it worthwhile.
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