Listers,
Remember that 4 and more piston calipers are alloy and very light and so
contribute less to the unsprung weight.
Sliding calipers are basically boat anchors (too heavy) as far as proper
full-house, no expense spared racing and rallying.
But we are lowly privateers and road car drivers and don't need the extra
3/10ths of bugger-all per kilometre speed difference.
Personally, I really enjoy out driving expensive cars and hella-modified
cars in my cheap but big-hearted rides.
We probably spend less on the whole car than they spend on wheels and
tyres!!!
Regards,
Nick
----- Original Message -----
From: Brad HALLETT <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, 8 January 2001 9:39 PM
Subject: RE: Brakes - Long
> Excellent point Luke
>
>
> Regards
> Brad HALLETT
> http://www.powerup.com.au/~bhallett
>
> http://www.datrats.com.au for all Datsun performance equipment!
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Luke Clough
> Sent: Tuesday, 9 January 2001 10:22
> To: [EMAIL PROTECTED]
> Subject: Re: Brakes - Long
>
>
> I think the problem with slide arm setup is the flex that you get. This
> leads to
> more pressure exerted at the outer edge of the rim than the inner (maybe
> better
> for cooling!), with opposing pistons the caliper body would be a lot
stiffer
> than the effective body of the sliding arm type. The step from 2 to 4
piston
> calipers (and 6 piston) allows the pressure to be distributed more evenly
> across
> the area of the pad. Resistance is not exactly equal to the normal force
> multiplied by the coefficient of friction. High pressure spots would lead
to
> localised regions of overheating on the pads, which could reduce the
> effectiveness of the part of the pad that is doing the most work. Just my
> thoughts on the debate. Remember most race cars use 4 and 6 pot calipers
for
> a
> good reason. The amount of force developed is still down to your leg (plus
> booster) pushing the fluid hard enough to create the desire pressure, the
> rest
> is just ratios of cylinder areas and a trade off between peddle drop
> (smaller
> m/c = larger pressure for the same leg generated force) and the feeling of
a
> hard brake peddle.
>
> Luke Clough
>
> Brad HALLETT wrote:
>
> > Thrill seekers
> > I too agree that the force exerted on each side would be close to equal,
> as
> > there is no real mechanical advantage or disadvantage afforded by the
> > slide-arm setup (want of better wording). Some force would have to be
> lost
> > in the transfer though, due to heat, binding of components etc, and a
lag
> in
> > activation would occur as the system relies on the cylinder side to
apply
> > pressure before activating the non culinder side. I still think two or
> four
> > pots are the way to go simply due to the even and immediate distribution
> > applied to the rotors. Doesn't make a hell of a difference to braking,
> but
> > component wear and reliability would have to be enhanced.
> >
> > Regards
> > Brad HALLETT
> > http://www.powerup.com.au/~bhallett
> >
> > http://www.datrats.com.au for all Datsun performance equipment!
>
>
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