Y2KZX12R
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posted April 13, 2004 06:32 PM
Head flow for zx12r's...
So what have you guys who have worked cylinder heads gotten for flow?
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Y2KZX12R
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Y2KZX12R
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posted April 15, 2004 06:18 PM
man, know one knows what their flow numbers are? A local 12r owner was asking what you can get from one of these heads.
I figured someone on here would know.
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canadamaxxer
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posted April 15, 2004 06:46 PM
I just ported my head but used the motutuneusa.com techniques (take the time to read what this guy has to say.... mototuneusa.com.....you don't have to agree, but at the very least it is really interesting and thought provoking) ..... it is not about flow numbers and quantity, but about quality of the airflow and keeping the air/fuel in the cylinders, not letting a large portion of the mixture back out. The bike will be back together in about a week and will hit the dyno for mapping in about 2-3 weeks. Then we will see the hard data.
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BA
Pro
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posted April 15, 2004 08:54 PM
I'm tryin' to find out on mine, but not having great luck.  I have numbers from Schnitz that they report (for comparison), but I'll have to get them later.
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your car is slow
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posted April 16, 2004 08:18 AM
Pretty sure kevins shop put one on the flowbench when they cleaned the head up.
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BA
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posted April 16, 2004 08:49 AM
Per Nina at Schnitz Racing:
stock flows: 138 - 140cfm, 91.5 - 92 avg @ 400"
"pre-stage" = 144 - 146cfm, 95 - 96 avg @ 400"
street/strip = 148-152cfm, 99-100 avg @ 400"
That is exactly how I got the data from them, so my apologies if it they seem out of whack or the '400' should be '.4'.
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Hells Dark Lord
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posted April 16, 2004 08:50 AM
yeah Kevin was working on a set of heads I thought for a 12.....I would be interested to know what he is gettign out of them...
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Y2KZX12R
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posted April 16, 2004 05:00 PM
Cool, thanks guys.
Canadamaxxer, yea shape is more important than port volume, for sure. I'll agree with that.
I read some stuff on motomans web site a few years ago.
I'll have to make some time to read his site.
BA, thanks for the info. I'm not sure what test pressure they were using.
400" of water? maybe 40" of water.??? But the flow numbers would be alot bigger.
My head stock was 122 cfm@10 inches of water. I did some work but no real big gains. I wasnt looking to increase flow at max lift. Most of the inprovements were in the lower lift ranges. Afterall the valve is at the lower lift ranges twice as often. Anyhow, find out the test pressure if you can and a flow number at max valve lift of a stock intake cam.
Kev, you got any input here?
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MadMike
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posted May 03, 2004 04:33 PM
Mine just flowed 150cfm, I did not see it but I am going to take it and have it re-checked... I am very happy with the work! for sure!
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Y2KZX12R
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posted May 04, 2004 01:59 AM
Mike, any idea what the test pressure was? 10" and 28" of water are the typical pressures used.
To go from 10" to 28" of water X by 1.67
Example 122cfm@10" is 203.7@28"
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Y2KZX12R
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MadMike
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posted May 04, 2004 04:03 AM
? no I will have to check what they did.
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Marcos Peguero
Zone Head
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posted May 04, 2004 07:56 AM
I worked with his tecnique for years, in this bikes, ZX9, F2, R6 with great results and I have seen him worked with several bikes with good results.
The important thing for us is that the ZX9 has the same bore, stroke ratio as the ZX12r and the results with the ZX9 where more than impresive. I have ZX9 friends with reduded ports with big bore kits.
I dont know much about flow, but form what I can deduce the important its to keep the flow but to reduce the volume of the port so the velocity of the mix is increased.
One of the important thing that PaT M. told me when he built me a F2 head was to retard the intake a little.
Not everyone loves his tech. but I can say that most of the road bikes he builds (most in europe) are podium bikes.
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BA
Pro
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posted May 04, 2004 01:57 PM
by the way, where does one go to get a head checked for flow??
I got mine done and want to see some numbers!!!!! (make sure something was actually done for those $$$)
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TurboBlew
Moderator
BUSY DOING THE SCHIAVO
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posted May 04, 2004 02:05 PM
At a machine shop that has a flow bench.
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Marcos Peguero
Zone Head
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posted May 04, 2004 03:29 PM
Dont worry about flow, put the head on and try the thing and post some numbers.
I have heard a lot of guys talk about flow and go slow, is the velocity that counts.
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canadamaxxer
Pro
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posted May 04, 2004 03:39 PM
I velocity ported (reduction ported, whatever) my head and am very happy with the results. I can give pointers to anyone who is interested in doing this.
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kcadby
Pro
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posted May 04, 2004 04:12 PM
 Edited By: kcadby on 4 May 2004 17:13
150 CFM would have to be @ 10"...
I'll have to ask Ryan what the last 12 head flowed...(I have no memory )...
We check them at 10 and 28"...MAN do they make some NOISE at 28!?!?!?
He also got some VERY nice #s out of his last Bbusa head he put on his personal bike...
He/himself ran 160MPH on it at Gville a couple of weeks ago...not too bad for a 1397...I didn't get a chance to ride it...yet...
TOO busy having FUN on my ZRX turbo 
I'll try to get back with the ZX12 #s...after I ask Ryan tomorrow...
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Y2KZX12R
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posted May 06, 2004 05:21 PM
150 CFM at 10" ? that would be a huge improvement over stock. Numbers like that would require bigger valves and major blending.
I'll bet they tested at about 20"
It really doesnt matter the pressure. Its totally scaleable. You just need to know WHAT the test pressure was.
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Y2KZX12R
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