Thanks for any help at all, I appreciate when people take the time to offer
opinions and their own experiences.
The Max has the same diameter and thickness disc rotors as the XJR. At least the
late model Maxes do.
The diameter is 298mm and thickness is 5mm for both Max and the XJR-1300.
At the end of the day if the XJR's setup (master and R1 type calipers) works
better than the V-Max OEM brakes then it has been worth the effort at relatively
inexpensive cost. Frankly if I get within 85+% of the XJR's brakes with the
XJR's parts it will make the brakes 30-40% better than a stock V-Max easily.
Sam Blumenstein #795
P.S see my answer to Thomas Powell.
Fischhouse wrote:
> Sam, I did a quick calculation and you lose about 20% of the braking clamp
> force with the larger master cylinder of the V-Max on the XJR calipers. This
> means you would have to squeeze harder on the lever to develop the
> equivalent braking. This is assuming same rotor and brake pads.
>
> Interestingly the XJR and the V-Max come out a wash with there respective
> master cylinders in this calculation. I was wondering though, are they
> working on the same diameter rotors? Brake torque is product of the applied
> braking force (clamp force times coefficient of friction) and the effective
> radius of the rotor (approximately the center of the braking surface).
> Bigger the lever arm, in this case the rotor diameter, the greater the brake
> torque for a given application of force at the caliper. In addition to the
> twin piston calipers in the later model V-Maxes the rotor diameter also
> increased.
>
> To answer to your second question, yes BUT as discussed above the braking
> won't be the same unless the rotors are the same diameter. The smaller
> diameter master cylinder would end up with efforts similar to the stock set
> up but you will have longer travels for equivalent fluid displacement
> requirements of the calipers.
>
> What effect fluid displacement? Lots of things, applied pressure, seal
> roll back, squareness of piston to rotor, lining flatness, lining material
> compressibility, brake wear (particularly true after hard usage with many
> high pressure stop). Some brakes develop taper wear which adds more spring
> to the system and more travel. Extreme usage such as racing can result in
> brake pads and rotors warping like potato chips.
>
> I hope all my long winded discussion is helpful,
>
> Ronald Fisch V.M.O.A. 78
> 86 mostly stock, [EMAIL PROTECTED]
.............................................
To unsubscribe go to http://www.sayegh.org/unsubscribe.htm
.............................................
