As was I once I fitted Ferrodo Exel pads to them (200B callipers).
They were crap with the pads that were in my 1600 when I bought it though.
Till next time bye for now.
Rick White.
--- "Errol Smith" <[EMAIL PROTECTED]>
> wrote:
>Ken,
>Well cut my legs off and call me Shorty! That throws a different light on
>the performance. What you have said makes sense to me and I have modified
>the spread sheet accordingly. It would explain why Terry is so happy with
>the 200B calipers performance!
>Cheers
>Feral Errol
>mailto:[EMAIL PROTECTED]
>http://www.datrats.com.au/
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED]]On Behalf Of Ken Abraham
>Sent: Saturday, January 06, 2001 5:23 PM
>To: [EMAIL PROTECTED]
>Subject: Brakes - Long
>
>
>Errol, Terry, Trevor et. al.
>
>Some Notes and questions about brakes resulting from my field trip to the
>Wreckers,
>(some of my recent posts on this have been rejected by the server, so I
>don't know how much has already got through).
>
>1. Sumitomo twin piston calipers
>Readily available (i.e choose a good pair and don't pay more than $20 each)
>on some Toyota Corona's and Mark 2's (6 cylinder sports coupe), all have
>braided lines.
>There are 3 main types, they differ in where the brake line attaches to the
>caliper.
>The Sumitomo caliper bolts straight onto an early 200b Strut, and I assume
>it goes straight onto the 270mm brake-disc 240K struts.
>
>2. Single piston versus twin piston, and four piston - IMPORTANT
>Previously, we have calculated the effective piston area of a single piston
>caliper as the area of the piston. However, actually the effective area is
>slightly more than double the area of the piston since the force exerted on
>the medial chamber wall (the inner face, opposite the piston) is used to
>press the lateral (outside) pad against the disc.
>With this new view, compare various calipers below...
>(Note the greater the effective piston area - the greater the force on the
>pads for a given brake line pressure, Pressure=Force/Area)
>Porsche 993 Turbo caliper has 2x 44mm pistons and 2x 36mm pistons giving a
>total area of 50.7681cm sq.
>By my reckoning the stock 1600 caliper would have 2x 20.43cm sq. = 40.86cm
>sq.
>The big 200B caliper would have 45.80cm sq.
>The poor old Sumitomo would have 36.19cm sq.
>The Rover 3500/AP Twin pot would have 51.04cm sq.
>Volvo & Hilux 4 spots 28.27cm sq.
>
>As I see it there is no difference in the surface area to volume ratio ( i.e
>caliper cooling ability) between 1, 2 or 4 or even 10 piston calipers.
>Perhaps the advantage of 4 spots is that they distribute the clamping force
>over the length of the pad better, hence reducing disc warp and pad hot
>spots.
>Perhaps single piston sliding calipers are more prone to flex and pad knock
>off than the opposed-piston fixed type caliper.
>
>3. Sources for brake mods and further research,
>The Nissan Urvan has large single piston sliding calipers on vented rotors,
>the calipers have the Datto 90mm bolt spacing, but with ~M20 (i.e large)
>bolts, and would fit on Bluebird or R31 Struts with slight modification.
>Approx piston size is 55mm, eff. area = 47.51cm sq.
>BMW 3.0S calipers are 4 spot vented at the front and twin piston vented at
>the rear have 90mm spacing and may fit on Datto 200b, 1600 etc... strut,
>don't know what type of disc to use though. E28 also has 4 spots and twin
>spots. E30 has twin spots up front.
>
>4. Bluebirds/R31
>The Bluebird is not an 'orphan' or black sheep as people have suggested,
>parts from it can be good for swaps.
>The disc brake rear (TRX, LX) is an early version of the R31 rear and the
>calipers are interchangeable (internal handbrake on Bluey though), similarly
>up front, the Bluebird brakes are just non-vented R31's
>There are DBA sport rotors available for the R31.
>The disc brake rear is basically what is fitted to the VN Commodore!
>I would like to find a swap for the rear caliper though. I hoped to fit
>Bluebird front calipers to the rear and fit a Mini pressure regulator,
>however the bolt and pin spacing is different, any ideas?
>
>5. I made a tactical decision and went for the R31 250mm vented front
>struts, rather than the 270mm solid 240K struts, I'll just hang onto the
>Sumitomo's until The brake issue is resolved.
>I will have to change the spring seat though, or swap all the bits into my
>Bluey struts.
>BTW the R31 struts with vented rotors and finned calipers look SWEET.
>What car did I get the struts from, it was an R31 skyline, but it was a
>sports model in Two-tone grey - Not a GTS, they have 270mm discs. A
>silhouette maybe?
>
>Regards,
>Nick
>
>
>
>
>
>
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