supra5677
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posted December 11, 2005 01:43 PM
cam measurements question
To Board:'
I basically want to make the bike more peaky.. Right now the bike is making peak power at 10,750 with the akrapovic.. I want to move the power band to the right and make peak power at 11,500. I know with more duration I can move the power band to the right and have less below 5,000 rpm.s
It sound like my effective lift and duration should be the measurements at 50 degrees..
supra
p.s. I also have the extended rev ecm
   
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ninja12
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posted December 11, 2005 07:53 PM
i think you mean 40 thou lift.
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dougmeyer
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posted December 11, 2005 09:56 PM
Supra,
If you "make it more peaky" you will make it slower under any condition except a roll on from 9000 to rev limiter. Who is leading you down this path?
D.
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supra5677
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posted December 12, 2005 08:17 AM
Doug this is my own experiment.. Don't worry Doug I'm not going to make the bike unbearable to ride.. 
supra
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dougmeyer
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posted December 12, 2005 09:48 AM
OK , just trying to save you the work. But, I'll look forward to hearing your results. Stranger things have happened....
Doug
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supra5677
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posted December 12, 2005 10:06 AM
Thanks Doug:
Actually tinkering and figuring is what I enjoy doing.. Keeps the wife in the house and me in the garage.. I found the stock specs on the 12r cams:
lift numbers: .359 in/.342 ex
duration at .050 is 244in/238 ex
Im looking for something a little more nasty and still be able to keep most of my drivability. I want to take the most advantage of my extended rev limiter
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osti33
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posted December 12, 2005 01:56 PM
 Edited By: osti33 on 14 Dec 2005 16:34
edit.
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Y2KZX12R
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posted December 13, 2005 03:03 AM
supra, where did you get the lift numbers from?
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Y2KZX12R
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supra5677
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posted December 14, 2005 08:42 AM
I got the lift numbers from Webcamshafts..
Megacycle makes a .377lift intake and 253 duration at .050..
I'll probably go with that for the intake cam and .369 and 252 @.050 for the exhaust cam.. This should be streetable without losing to much bottom end..
supra
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Y2KZX12R
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posted December 14, 2005 03:44 PM
so web cams says that the stock cams have .359/.342 for lift? interesting.
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osti33
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posted December 14, 2005 04:20 PM
Edited By: osti33 on 14 Dec 2005 16:41
quote:
Thanks Doug:
Actually tinkering and figuring is what I enjoy doing.. Keeps the wife in the house and me in the garage.. I found the stock specs on the 12r cams:
lift numbers: .359 in/.342 ex
duration at .050 is 244in/238 ex
Im looking for something a little more nasty and still be able to keep most of my drivability. I want to take the most advantage of my extended rev limiter
I told you what the numbers were a week and a half ago when you asked.. 
Look here. I posted the numbers. http://www.bikeland.org/board/viewthread.php?FID=1&TID=20413&set_time=
Right off megacycle's website. Look where it says STOCK 2000 ZX-12 CAMS.
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Y2KZX12R
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posted December 15, 2005 03:10 AM
Edited By: Y2KZX12R on 15 Dec 2005 06:57
osti33, supra, did either one of you two ever actually measure the lift. ?
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supra5677
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posted December 15, 2005 07:59 AM
no...but it appears that the cam specs on the zx9r, zx10r, and zx12r are identical..
something tells me that the 10r has the same lift specs but probably more duration... I have a lot more research to do before I do anything.
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Y2KZX12R
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posted December 15, 2005 08:39 AM
The lift numbers I posted are actual lift at the valve I measured. I could understand a few thousandths difference but these numbers arnt even close.
You might want to contact megacycles and find out whats up.
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Y2KZX12R
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posted December 15, 2005 08:41 AM
Ah, i think i understand. That is the cam they recomend for a stock zx12r. ???
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supra5677
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posted December 15, 2005 01:25 PM
I got those lift numbers from webcam as well as megacycle and another guy on this posting.. They gave me the lift and the duration @.050.. If your numbers are correct they maybe this is the crazy "restriction" fearsome k is talking about..
supra
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supra5677
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posted December 15, 2005 01:29 PM
.310 is a long way from .359 and .295 is a long way from .342... mmmmm
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supra5677
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posted December 15, 2005 01:35 PM
recommended cam for a stock zx12r were .383/.369 and 253/252 duration @.050 this is the cam webcam sells,
The 00 and 01-04 cams have different part numbers what is the difference besides the cam angle sensor?
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osti33
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posted December 15, 2005 01:45 PM
Edited By: osti33 on 15 Dec 2005 13:58
quote:
osti33, supra, did either one of you two ever actually measure the lift. ?
Nope. Don't need to. Megacycle did it for me. They have been doing motorcycle cams for many many years. I'm sure they know how to measure valve lift...
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osti33
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posted December 15, 2005 01:47 PM
Edited By: osti33 on 15 Dec 2005 13:59
quote:
The lift numbers I posted are actual lift at the valve I measured. I could understand a few thousandths difference but these numbers arnt even close.
You might want to contact megacycles and find out whats up.
Call them and ask. I don't need to find out. I already know. They told me what the stock numbers were and I have no reason to doubt them. I was running the .385 intake and .385 exhaust cams in my 12 for a while. I did measure those and they measured very close to what megacycle says.
I would say you need to check your measurements again.
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osti33
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posted December 15, 2005 01:48 PM
quote:
Ah, i think i understand. That is the cam they recomend for a stock zx12r. ???
NO! Those are stock ZX-12R cam measurements.
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supra5677
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posted December 15, 2005 02:06 PM
to Osti33 did you run those cams with a stock motor? How was the drivability?
supra
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osti33
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posted December 15, 2005 02:25 PM
Edited By: osti33 on 15 Dec 2005 14:26
quote:
to Osti33 did you run those cams with a stock motor? How was the drivability?
supra
No. I ran those cams in my 1375 stroker motor. They preformed well in that motor. It is pretty much a race only bike so I wasn't too worried about driveablity.
Sorry I can't be more help.
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Y2KZX12R
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posted December 16, 2005 03:34 AM
Has anyone else on the board actually measured the lift of the stock zx12r cams?
I guess i could have screwed up measuring, or wrote down the wrong numbers.... but I'd be surprised if i did.
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osti33
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posted December 16, 2005 08:17 AM
Y2KZX12R,
I personally have not. Now I wish that I would have. It would be interesting to compare our numbers.
Sorry I can't help.
Ryan
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