[s-cars] G60 brakes

[Steve Marinello]

Rich:

Actually, I was confused.  That's what happens coming into a thread in the
middle.

I was confused about the G60/BR piston sizes and wasn't on the same page
anyway, just looking at the effective single piston equivalent of the G60's,
but thinking/reading that they were 44 mm + 36 mm pistons, not the two 45 mm
pistons.

By my way of looking at things, two 45 mm pistons equate to a single piston
cross-sectional area equivalent to a 63.64 mm single piston, using the old
pi*D squared/4 equation, adding the two and taking the square root.

By the same method, I get a single piston equivalent of 80.40 mm for the
BR's, taking the area of two 44 mm pistons and two 36 mm pistons all summed,
which yields exactly your 26% cross sectional area improvement.

Sorry I was a page back, and being dense.

Steve


----- Original Message -----
From: "Richard Tanimura" <richard at tanimuras.com>
To: "Steve Marinello" <smarinello at charter.net>
Sent: Monday, October 27, 2003 12:19 PM
Subject: RE: [s-cars] G60 brakes


> Steve,
>
> I may be way outta synch with everybody here.
>
> G60 : 2 pistons/caliper, 45 mm each according to the data given on the
site
> I quoted.
>
> Big Reds: 4 pistons/caliper, 2 x 44mm and 2 x 36 mm. This is the equiv. of
2
> x 56.8mm pistons. The math is:
> SQRT( 44x44 + 36x36) = 56.8
>
> 56.8/45 = 1.26
>
> Rich
>
> -----Original Message-----
> From: s-car-list-admin at audifans.com
> [mailto:s-car-list-admin at audifans.com]On Behalf Of Steve Marinello
> Sent: den 27 oktober 2003 16:01
> To: Richard Tanimura; Keith Maddock; s-car-list at audifans.com
> Subject: Re: [s-cars] G60 brakes
>
>
> Huh??  back at you, Richard.
>
> I always calculated it the same way as Keith...total cross sectional area
of
> the two pistons compared to the single piston, giving an advantage way
less
> than 26%.  Could you explain your math/logic to me?
>
> Thanks,
>
> Steve
>
> ----- Original Message -----
> From: "Richard Tanimura" <richard at tanimuras.com>
> To: "Keith Maddock" <Keith.Maddock at TRW.COM>; <s-car-list at audifans.com>
> Sent: Monday, October 27, 2003 8:17 AM
> Subject: RE: [s-cars] G60 brakes
>
>
> > Huh??
> >
> > The front G60 calipers are 45mm and the rear G60 calipers are 36mm. You
> > can't just add them.
> >
> > What we have to compare is 2 x 45mm with 2 x 56.8 mm (which you
correctly
> > calculated as the equivalent of 44 and 36). This means the Big Reds are
> 26%
> > larger than the G60's which is what I originally suspected.
> >
> > Rich
> >
> > -----Original Message-----
> > From: Keith Maddock [mailto:Keith.Maddock at TRW.COM]
> > Sent: den 27 oktober 2003 09:36
> > To: s-car-list at audifans.com; richard at tanimuras.com
> > Subject: Re: [s-cars] G60 brakes
> >
> >
> > Rich,
> >
> > I should have worded my statement a little bit better.
> >
> > I said:
> > "G60's have two pistons with the same effective size as an about 60mm
> > piston."
> >
> > I should have said:
> > "G60's have two pistons that together have the same effective size as
one
> > approx.  60mm piston."
> >
> > Looking at the data from Jimmy's site, it should be more accurate to say
> > that the two pistons together (45mm & 36mm) are the same effective size
as
> a
> > single 57.6mm piston.
> > Perhaps they should have called it the G58 instead of the G60 !
> >
> > Regardless, to my original point, this is still larger than Big reds,
with
> > 44mm and 36mm pistons, which together  are the same effective size as a
> > single 56.85mm piston.
> >
> > Thanks for pointing this out.
> >
> > Cheers,
> > Keith
> >
> >
> >
> > Keith Maddock, TRW Automotive,  Koblenz, Germany
> > Slip Control Systems, Systems Design, Traction Control
> > +49 (0)261/ 895 2474    -   -   keith.maddock at trw.com
> >
> >
> > >>> "Richard Tanimura" <richard at tanimuras.com> 21:43:52 25.10.2003 >>>
> > Keith Maddock stated on this list that the G60 had 60mm pistons. I
> stumbled
> > over this information on
> > http://www.urs4.com/technical/brakes/UrS4_brakes.html which indicates
this
> > might be incorrect.
> >
> > I am not in the least interested in being picky. Keith has helped me
> > enormously in the past. But incase the data is important to someone, I
> > suggest atleast that they double check the data.
> >
> > Rich
> >
> >
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