Damien,
Yes and no to what your saying. The pads are not the scource of the clamping
pressure. The pistons are. The clamping pressure is distributed over the pad
(hopefully evenly). So to me this means if the piston size remains the same
then the clamping force per unit area (say in cm2) on a smaller surface area
pad is more than on a larger surface area pad.
This is where your on the ball. A bigger pad has more heat capacity than a
smaller pad. So if you use a bigger surface area pad it will take relatively
longer to heat up so less fade. This is where testing comes into it as Brake
pads have different heat ranges where they work best. To hot and you get
fade to cool and not as effective (ever tried to stop hard with cold metal
kings then you'll know what I mean).
Nissan 4-spot conversion. Z32 300zx calipers are 3.75cm diameter pistons (X4
so total piston area of 44.18cm2). Bigger pad area, light weight. Downside
hard to fit and cost.
Regards
Trev
-----Original Message-----
From: damien cm [mailto:[EMAIL PROTECTED]]
Sent: Thursday, 24 May 2001 20:10
To: [EMAIL PROTECTED]
Subject: RE: brakes
Trevor,
Would'nt the larger surface area of the Hilux/volvo/200B/Commodore pad have
a effect on clamping force? If not clamping force,what about heat
dispertion? If there so efficient, why don't more people use them instead of
the typical Magna/Commodore, 200B, or Hilux/Volvo/Nissan 4-spot conversions?
Just a thought.....
Damien
>From: "Pooley, Trevor" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
>Subject: RE: brakes
>Date: Thu, 24 May 2001 13:20:54 +0930
>
>Andrew,
>
>Caliper Bolt spacing, Yes the same for 200B, 240K (253mm disk) and 240K
>(270mm disk). (88.9mm rings a bell)
>
>Disk and caliper offsets were different on the 200B SX / 240K (253mm disk).
>
>240K (253mm disk)(early) and 240K (270mm disk)(later) calipers can be
>different. AFAIK Early have 2 piston simitomos (48mm diameter pistons) and
>late (270mm disk) I have seen only with single piston calipers at wreakers
>(51mm diameter pistons). Andrew Greenbury (Ozdat list) showed me some later
>struts with 2 piston calipers. So this may have been an option or possibly
>someone has done a conversion to 2 pots.
>
>The Caliper bolt holes on the later 240K struts are further away from the
>center of the stub axcels. This mean you can not run early 240 K (253mm
>disks) and 2 piston simitomos on a later strut. You can run the 2 piston
>simitomos on the later strut with the 270mm disk.
>
>AFAIK hilux and volvo four pots have pistons which are only 30mm diameter.
>So from my sums SQ cm total piston area for four pots is 28.27. For the
>simitomos 36.19. So I believe the simitomos have 28% more clamping
>potential
>than the hilux/volvo combos.
>
>I run 240K Later struts with new RDA disks (270mm), simitomo calipers and
>bendix ultimate pads for sprints.
>
>Regards
>Trev
>
Trevor,
Would'nt the larger surface area of the Hilux/volvo/200B/Commodore pad have
a effect on clamping force? If not clamping force,what about heat
dispertion? If there so efficient, why don't more people use them instead of
the typical Magna/Commodore, 200B, or Hilux/Volvo/Nissan 4-spot conversions?
Just a thought.....
Damien
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