KZScott
Needs a life
high on speed
Posts: 7235
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posted February 14, 2010 09:21 AM
running 1 front rotor vs 2
I would like to get some opinions on who has tried running just one front rotor. I have been told all I really need is one rotor to stop.
advantage would be a lot of reduced weight, both static and rotating
disadvantage is a much lighter front end. imo, the caliper is very effective ballast weight as far as location goes.
my oem drilled rotors are slightly warped so I got a set of EBC Prolights from Chavcat. these are actually heavier than stock, and the plan was to get them lightened/machined, but now Im contemplating running just one(and put the other on dads bike). cheaper/easier
main focus is drag racing, with lsr second. street manners and cornering come dead last 
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01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
  
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Shane661
Needs a life
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posted February 14, 2010 09:25 AM
If you have enough wheelbase and chassis setup, you will be fine with one.
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woppi
Pro
Posts: 1362
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posted February 14, 2010 09:26 AM
at an drag race track - i can see no problem !
i tried it sometimes - no problems ! if the track is long enough !!!!
you looooose many weight !
____________
1st TFA Member / Austria !
" if it has wheels or titts - sometimes you will get troubles "
2000 Limited ZX12R NOS
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shiphteey
Needs a job
Posts: 2529
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posted February 14, 2010 07:03 PM
About 3 pounds from the rotor and another near 4 pounds from the caliper, converted single line weight savings over big dual rubber ones, etc. About 7 total. Stock arm had me wheelying a little more. For the strip on a stock arm I'd leave both on there but if you're stretched and lowered I'd just run one.
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Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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KZScott
Needs a life
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Posts: 7235
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posted February 14, 2010 07:10 PM
thx guys
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted February 14, 2010 08:46 PM
Take it off........
Tune the clutch around it, or move some weight to account for it........., or, smelt some lead.......
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2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
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KZScott
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Posts: 7235
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posted February 14, 2010 09:12 PM
Im working on getting the weight moved around, yeah thats the ecu up on the airbox 
took about 20 pounds off the bike tonight in the form of ballast weight on the forks and the brake stuff. i hated that ugly ballast on the forks....
i had a big battery in the stock location, probly 15 pounds, replaced with 2 stockers 11 each
net -13, havent weighed the 3/4 tank yet....
i have smelted lead before, i may do more. 2 pounds in the front axle so far...
i knew i kept the stock rear brake line for a reason
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted February 14, 2010 09:26 PM
Get the rear of the meg up about 3 inches or it will drag in the launch........
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42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted February 14, 2010 09:50 PM
Also, if you are real anal a about tire pressure between rounds...., it saves your kunckes.........
LOL
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42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
Catalyst Racing Composites
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KZScott
Needs a life
high on speed
Posts: 7235
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posted February 15, 2010 02:30 PM
i didnt get the bracket with it, its just hanging there till i make one
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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Pretty Fast
Expert Class
Posts: 116
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posted February 15, 2010 06:55 PM
 Edited By: Pretty Fast on 16 Feb 2010 02:56
I have never thought about taking the front rotor off until I thought about how much easier it would be to clean the front rim. But I decided against it because the front is where your main stopping power comes from and the rear brake will never be able to compensate for the front. When you're going 100 or 150 mph, I want both my calibers and rotors on the front working together at the same time.
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almost_les
Zone Head
Posts: 590
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posted February 15, 2010 07:15 PM
IMHO the biggest factor would be the shutdown area at the track that you race at. no point in saving all that weight if you cant do it safely.
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KZScott
Needs a life
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Posts: 7235
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posted February 15, 2010 07:25 PM
well i can stop well before the first turnout at my local track with 2 drilled out oems i dont really use the back much at this wb
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
|
NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted February 15, 2010 09:28 PM
Its funny, everyone freaks about it....., look at the brake area, for the weight of the bike.........
you can lock the brake with one rotor....., one is all that is needed......., two are for back road carving to keep the temps down.
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
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AMSOIL
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blueshark
Novice Class
Posts: 99
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posted February 16, 2010 08:54 AM
Nox's last statement is correct, the dual rotors help with heat when road racing. I never had a problem stopping with one rotor at the strip. The only thing I noticed was the front brake grabbed a little quicker with one rotor. I assumed it was because the master cylinder plunger volumn was designed for two calipers. I could tell a difference in rolling resistence using one rotor.
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted February 16, 2010 05:35 PM
I have run with a single for years and years, both at the strip and at the Texas Mile and I have had no issues....
it is not really that much weight, but I kind of wanted my RC rims to show... I have thought about putting the second back on for LSR, but never did end up doing it and I stop just fine from 200...
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200-MPH CLUB MEMBER!
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted February 17, 2010 07:16 AM
Look at it this way......., I have locked up the front end with one front brake........, why do you need two, unless its to keep weight up front........?
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
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Conway Cycle
Syed Leathers
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Shane661
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posted February 17, 2010 07:39 AM
Edited By: Shane661 on 17 Feb 2010 18:01
I already outlined much of this to Scott, but I will chime in for the benefit of others:
1) Stopping Power
As long as your track has a good shut down area, one rotor is fine. I have stopped from 170 mph in well under 1000 feet, and from 211 mph in under a mile. This is with relatively easy brake application in order to keep from getting the rotor too hot. Heat is your main concern with hard braking in a single rotor application. It is not a good setup for the street, imo...you will notice reduced braking performance, and riding with a passenger would not be wise.
2) Weight
You will shed about 6 lbs. going with a single rotor/caliper up front. This will have a noticeable impact on the bikes tendancy to wheelie. Obviously the shorter the bike is, the more of an issue it might be.
Anyway, that's my .02.
Shane
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woppi
Pro
Posts: 1362
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posted February 17, 2010 10:53 AM
my nice rim
____________
1st TFA Member / Austria !
" if it has wheels or titts - sometimes you will get troubles "
2000 Limited ZX12R NOS
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