KZScott
Needs a life
high on speed
Posts: 7235
|
posted November 09, 2009 07:35 AM
cams and nitrous
some general questions/theories i wanted to run by the experts 
Ive noticed that stock cams are very similar when you compare IN to EX, not much difference.
Aftermarket grinds seem to follow the pattern of exaggerating the difference and going with more lift/duration on IN than EX
Q#1 in a NA setup, would the motor with aftermarket cams make more power if the EX cam matched the bigger profile of the IN or would it result in a loss of power?
I dont fully understand what goes into designing cam profiles, but ive noticed that my motor works ok with equal cams(2 stock IN) but they are very similar to the stock EX cam
With a nitrous motor I believe its generally accepted that you require more flow on the EX side compared to a similar motor that is running NA. easy to force feed it, but not so easy to get the extra gasses out
Q#2 if the answer to #1 is yes the performance will suffer or not improve from running "equal cams" would the nitrous motor benefit from the cam change, or should it rather have larger valves and ports instead of the larger cam.
the motor in question would be running about 80hp worth of nitrous. i doubt a small dry shot wouldnt really impact things, but Im guessing 80 wet should, and more would have more of an impact on the head and cam selection
thanks 
____________
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
  
|
rgeorge
Expert Class
Posts: 220
|
posted November 09, 2009 10:03 AM
Testing cams with nitrous on a V8:
http://www.stangtv.com/forum/nitrous-cam-101-dyno-testing-four-5724.html#
Two videos on the page that both auto start. Pause the second one until you are finished with the first.
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted November 09, 2009 12:05 PM
interesting, but they seem to be backwards compared to our bikes as far as which valve gets more lift?
____________
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
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted November 09, 2009 02:12 PM
looking into some busa stuff, i see Carpenter is using .425 lift cams(unsure on duration) on IN and EX on some of the bigger motors(1397/1441 and up), and from what i see they like nitrous.
____________
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
|
chavcat
Zone Head
Posts: 524
|
posted November 09, 2009 06:05 PM
Scott - Carpenter has also gone back to using OEM size valves in big motors. Keep in mind these are smaller than the ZX12R's also.
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted November 10, 2009 04:01 PM
I think Im officially lost on what to get 
____________
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
|
|
|
HOME
NEW TOPIC