Lister,
if there is one amongst us who had his beaut little datto featured
in Zoom this month, congratulations goes to you for it, and also for the
beast therein......
Steve....
----- Original Message -----
From: Rick White <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, January 06, 2001 1:45 PM
Subject: RE: Brakes - Long
> 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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