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Enthusiasts from around the world dedicated to the preservation and ritual flogging of the infamous Kawasaki 2-stroke Triples
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PostPosted: Sun Dec 18, 2016 12:08 pm 
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Joined: Tue Jun 07, 2011 6:37 am
Posts: 10460
Location: Rio Rancho, New Mexico
Not exactly in line with your "stock" look, but not far off, is the tried and true EX caliper conversion. You can thin and drill your stock disc to about half the weight, and you only need one caliper and disc for all the stopping power you need. Jim sells the simple adapter and you can get pads anywhere unlike the specialty aftermarket calipers and such. :thumbup:

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........


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PostPosted: Mon Dec 19, 2016 6:07 am 
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Joined: Thu Jun 09, 2011 3:06 am
Posts: 4364
Location: PARIS FRANCE
6 holes on the Brembo
Image
Image


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PostPosted: Fri Dec 23, 2016 8:36 pm 
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Joined: Thu Jun 09, 2011 8:44 am
Posts: 1159
Location: Bangor, PA
If drilling your own holes in the rotors, go with....hole diameter=2 times the rotor thickness. With that you can get the biggest hole possible without loosing any surface area on the rotor.


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PostPosted: Fri Dec 23, 2016 9:25 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
Yes, but why not go with more smaller holes to increase the surface area, the theory being that cooling will be helped?

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PostPosted: Fri Dec 23, 2016 9:43 pm 
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Joined: Thu Jun 09, 2011 7:03 am
Posts: 4603
Location: Milang, South Australia
I have always been a small holes are better kind of bloke, unless you are drag racing or scared of the rear brake!! (stirring.....!!)

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PostPosted: Sat Dec 24, 2016 1:34 am 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3137
When Steve and I did the first drilled H2R discs, (decades ago, this time of year in 1972), we used the pattern Porsche used on their 1965 Can-Am cars, three rows, holes twice the thickness of the rotor (72 holes),. It has worked well over the years, and so have other hole patterns. To each, their own preference.


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PostPosted: Sun Dec 25, 2016 10:52 am 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 290
Location: Metamora, MI
Just wanted to thank y'all and I am hoping you have a splendid Holiday.

72 holes?
Diam. at 2x thickness?

Doing the math..............at 7.8 specific gravity................... :crazy:

7mm initial rotor thickness


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PostPosted: Sun Dec 25, 2016 11:16 am 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 290
Location: Metamora, MI
Just by drilling stock stainless steel rotors...


mm inches
7 0.275590551 thick
72 72 number of
14 0.551181102 diameter = 2x thick
each hole
area 0.238604238 sq in
vol 0.065757073 cu in
sg 7.8 g/cc
sg 0.475987063 g/cu in
total hole
vol 4.734509284 cu in
vol 77.58440363 cc
mass 605.1583483 grams
mass 1.332947904 lbs


20.20% mass reduction

Looks like surface area for cooling is the main reason for the effort.

Then again, heat flux from hot zone band to cooler areas may turn the rotor into a pretzel if pressed hard.

Auto-Retracting pads if bad enough! :eh:


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PostPosted: Sun Dec 25, 2016 11:27 am 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 290
Location: Metamora, MI
JP,
Where would I find such brakes in the pix of the Brembo's?

Looks OK but I did this set-up on my bike to neutralize the mass moment of inertia from the calipers when the steering is turned.

Best is the leading side of the forks, to keep the moment from unloading the tire in bumps. Marginal at best I know..... :think: ..

cliff


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PostPosted: Sun Dec 25, 2016 12:49 pm 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3137
We used off the shelf stock street bike rotors, .480 inch thick, drill holes double the thickness, rounded off to the next drill bit size we had, .500,. One half inch.

The swept area of the disc was measured, then divided in half (center drill hole center), then divided the 1/4th and 3/4ths distances for the other two rows. 1/4th and 3/4ths lines had one hole each per row on the same rotary table center, the 1/2 had one hole, exactly half way between the two outside holes.

Each hole set was 15 degree apart, all 3 rows, with the center row offset 7- 1/2 degrees from the outer rows. This gives 24 holes per row, 24 x 3 = 72.


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