zrexpilot
Expert Class
Posts: 470
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posted February 18, 2008 05:28 PM
 Edited By: zrexpilot on 18 Feb 2008 17:31
crank weight
whats your opinion on adding weight to the crank. Does this help for drag racing. Car guys have been doing it for years. My Mech. suggested I do it, he adds weight to the clutch.
disscuss.
PS my bike is almost done, latest mods are fixed my cutch, cut the oil pan, and did a 4 nozzle dry shot .
heres a pic from last time out.
  
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KZScott
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posted February 18, 2008 07:04 PM
it might launch a bit easier, but its not going to rev as fast. you allready have the heavy B crank...
____________
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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krexken
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Posts: 732
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posted February 18, 2008 08:36 PM
Good question. The average fast car doesn't have much of an rpm range so the extra weight really doesn't hurt the acceleration too much where some bikes launch at a relatively low rpm and then scream the rpms.
Bike is lookin good, Mario.
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted February 18, 2008 08:52 PM
They add weight to the clutch, or flywheel really to lessen bog......
I just took 3 lbs off my crank combo, I have a 2001 crank, and a 2002 flywheel.
You have a HUGE rpm range. Biggest thing that will help you, is launch hard, and keep the rpms at near redline......
If you cant, get a lock up, and tune the *&%$ out of it........
____________
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stuart racing
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N.H.R.A . Dragracing.
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posted February 19, 2008 11:57 AM
Edited By: stuart racing on 19 Feb 2008 15:38
SCHWEET looking Blue one brother...Ya done good....
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zrexpilot
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posted February 19, 2008 03:10 PM
Now what about rpm drop between gear splits, wouldnt crank weight allow taller gearing for the launch and less rpm drop between gears, giving more MPH ?
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NOX
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Posts: 3745
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posted February 19, 2008 03:25 PM
You should gear for top of 5th or top of 6th in the quarter. Bar none. In my application, top of 6tth, as I dont spray.
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2010 TMRC Super Street Points Champion
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2009 PMRA Super Street Points Runner-Up
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zrexpilot
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posted February 19, 2008 04:32 PM
I agree, but wouldnt crank weight allow a taller gearing and be at the top of 5th.
say 16-49 nets top of 5th, with crank weight and 16-46 youd net top of 5th = more MPH and maybe a better e/t ?
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NOX
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posted February 19, 2008 04:36 PM
I am with you there......., now I see, I guess it would be possilble. If so, I will have to change my gear ratio. If you watch my vids on youtube, you can see I am clicking 6th prior to 1000 ft with the low first gear. I am hoping having the ecu mod, will get me to 1/4 mile finish line, but the crank may change that. My 1-2 gear change comes before 60 ft sometimes, as I leave at 7,000
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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
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KZScott
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posted February 19, 2008 05:27 PM
what part of the clutch does he add weight to?
____________
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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zrexpilot
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Posts: 470
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posted February 19, 2008 09:15 PM
He builds a custom pressure plate and also does some work to the hub. He adds about 3 pounds. His bikes work thats for sure.
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KZScott
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posted February 19, 2008 09:47 PM
i dont see how that would work, in fact isnt it pretty much the opposite of what you are going for? if you wanted to add weight to the crank by putting it on the clutch, it would have to be on the basket. the basket turns with the crank, so any weight added to either has the same effect(more momentum to get you off the line) adding weight to the pressure plate or hub is adding weight to something you are trying to get to turn, not keep turning. its like putting on heavier wheels.....
____________
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 20, 2008 05:48 AM
Yeah, that does not make sense at all.......
What bike does he run, and what times does it run..........
Working, and working well are two different animals.
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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
Conway Cycle
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zrexpilot
Expert Class
Posts: 470
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posted February 20, 2008 07:55 PM
He's built several bikes, he also has added weight on the charging side. He's had a stock motored busa to 197.xx at the mile and they won recently on a turbo 1000 at hurricane alley, 8.40's
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KZScott
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posted February 20, 2008 08:30 PM
i can see it on the stator rotor, and the clutch basket... but not the hub and pressure plate
added weight isnt going to help at the mile. you dont have a prepped pad to launch off of. bogging off of the line wouldnt happen, the tire would just spin
____________
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 21, 2008 05:46 AM
Seems like a lot of added waste. Those times are not that impressive, lots of guys have done it, with stock weights of parts.......
____________
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
Conway Cycle
Syed Leathers
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dubious
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posted February 22, 2008 09:16 PM
maybe he uses it on salt to prevent tire spin.... thats a very real problem there...
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