[ZX12richard]

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Carbon Snorkle Test Info

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All information in this test was obtained from a digital volt meter paralleled with the Inlet Air Pressure Sensor, page 2-63 in the Kawasaki Service Manual and a DJ 250 Dynometer.



Dyno Day Voltage Readings



HOME/GARAGE 3.54 vdc = 28.92 in./14.206 psi. (ambient)

DYNO ROOM 3.52 vdc = 28.73 in./14.109 psi. (ambient)

*note: .02 drop due to elevation increase.



Idle on Dyno 2.75 vdc = 21.12 in./10.3745 psi.(1200 RPM)

*note: every .01 vdc = .0485 psi.



R.P.M./W.O.T.



2000 " 3.51/both snorkels = 14.106 p.s.i.

4000 " 3.49/ " " = 13.964 "

6000 " 3.46/ " " = 13.8185 "

8000 " 3.40/stock snorkel = 13.5275 "

3.41/Hans snorkel = 13.576 "

10000 " 3.35/stock snorkel = 13.285 "

3.36/Hans snorkel = 13.3335 "

11000 " 3.34/stock snorkel = 13.2365 "

3.35/Hans snorkel = 13.285 "



*note: from 8000-Rev Limit is where I gained 4 HP.



In comparison, the stock snorkel on the road at any speed above 40 mph at W.O.T. voltage always comes within .01 vdc of ambient but never above(at any speed). This indicates a "BOOST" of .824 p.s.i. over static (dyno readings).



In contrast, the Hans snorkel on the road revealed these voltage readings to me:



AMBIENT (ignition on/engine off)...3.52 vdc = 14.109 p.s.i.



R.P.M./W.O.T. (above 40 mph) 4th Gear

*note: RAM AIR system does not reach ambient until 40 mph



4000 " 3.52

5000 " 3.49

6000 " 3.48

7000 " 3.47

8000 " 3.46

9000 " 3.45

10000 " 3.44

11000 " 3.43

11500 " 3.43



Airbox Pressure/Vacuum dropped .4365 p.s.i. as RPM's climbed to Redline.



Stock snorkel maintains ambient pressure at W.O.T. throughout the Rev Range above 40 mph. in any gear at any speed.



"INTERESTING....."



Questions and Feedback encouraged and welcome...

If I am unclear on any info, please let me know!



P.S. NO REMAPPING WAS NECESSARY! A/F ratios are automatically adjusted by the ECU from information supplied by the Inlet Air Pressure Sensor.



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psycho1122





Parking Attendant

Posts: 26

posted February 24, 2002 12:23 PM

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PING

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zx12richard





Novice Class

Posts: 78

posted February 24, 2002 03:33 PM Edited By: zx12richard on 24 Feb 2002 19:26

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So if I understand you are saying that the Hans snorkel performs better after 8000 rpm compared to stock?



Am I correct in assuming that it matched stock below 8000rpm without giving anything up?



The clarification will help others as well, I think.





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RocketRacer





Novice Class

Posts: 72

posted February 24, 2002 04:12 PM Edited By: RocketRacer on 24 Feb 2002 16:19

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He's saying that on the dyno (static conditions without ram air - NOT real world conditions) he got a 4 horsepower increase with the Hans snorkel installed. On the road (ram air actually doing something!) the stock system performed better than the Hans snorkel - and the Hans snorkel performance continued getting worse as the engine rpm increased.

____________

Rocket!!

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psycho1122





Parking Attendant

Posts: 26

posted February 24, 2002 05:47 PM Edited By: psycho1122 on 24 Feb 2002 17:57

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Correct Rocket ! Unless someone comes up w/ another possible reason for the pressure drop w/ the Hans, The stock snorkel does maintain higher pressure ON THE ROAD.



Another Top Speed Test today Revealed these #'s:



Ambient(Ignition On/Engine Off) 3.53 vdc(14.1575 psi)

Speedo Indicated 210 mph / @ 11,000 rpm's / 6th gear.........3.45 vdc(13.77 psi). Thus a pressure drop of .3875 psi !

The stock snorkel would maintain at least 3.52 vdc(14.109 psi)which is .339 psi higher than the Hans !!



This test was at much higher speeds than the 4th gear test.



Now if anybody finds an error in my math or how I used the chart(pg.2-63)in the Kawi service book please contribute !

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dougmeyer





Moderator

Posts: 120

posted February 24, 2002 06:20 PM

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I'm not sure if these were my EXACT words some time ago, but.....

I told you so.

Doug

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psycho1122





Parking Attendant

Posts: 26

posted February 24, 2002 06:28 PM

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Yes Doug you did ! You said something like "Maybe a pound"



That came across my mind as soon as I did all the math!





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zx12richard





Novice Class

Posts: 78

posted February 24, 2002 08:21 PM

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I have a question about this test.....



(1) Was the readings taken just inside the front of snorkle or in the Frame(airbox) Itself?????



I don't understand how it can be lower unless readings was taken inside the snorkle and not the airbox.



My way of thinking is with the Monster snorkle you a raming in more air into the same amount of space in the airbox. Therefore I would think it would be more psi.



The finished space(airbox) is the same.



If taken right in the end of the snorkle natually the readings would be lower since it hasn't been squeezed into the airbox yet......



Just trying to figure this out. Doesn't make sense yet..... Thanxxxxxxxxxxxxxxxxxx



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[easyrider]

Richard: your last statement makes a lot of sense, but I remember reading somewhere about some math that was done that indicated that it may not be as simple as that.

It would be nice to have it explained, why cramming more air in with a bigger opening would lower top end performance, at first glance it doesn't make sense.

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[Guest]

I'm just throwing this out there, but the air from the snorkel goes

into seperate resonators before it reaches the airbox. Does the

Monster Snorkle use these?

</p>

 

[easyrider]

The Hans Snorkel has a smaller version water catch tube, but only one.

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[Guest]

Disclaimer: Not an Aeronautical Engineer...

I've done some work with aerodynamics as it relates to inkjet printers and here's what I've learned from the real experts that may relate:



1. Air doesn't cram into an opening like you think it should. Don't believe me? Try holding a funnel in front of a fan. You'll get very litte air through the "nozzle" small end. And the air that you get is going about as fast as the air off the fan to begin with.



2. Turbulence at the boundry layer near the surface over which the air is flowing will negate any speed up effects you want if the surface is not smooth or is the wrong shape. Wind tunnes are very much like ram-air. They are very long with smooth, tapered walls to speed up the air. Look into the stock snorkle....it's very smooth with gentle gradual curves.



3. It's clear with the placement, Kawasaki gave up some asthetics because they wanted the horsepower. Kawasaki Heavy Industries (which makes Jet aircraft, Helicopters, and engines) is like Lockheed Martin. They seem to know their shit when it comes to aerodynamics.



So, IMHO, I think that the Hans snorkle looks *very* cool, but I'd be surprised if it worked anywhere near as well as the stock snorkle in real conditions. I'd also say that I think the stock snorkle is one of the defining characteristics of the ZX-12.

</p>

 

[Barbarian-CBX]

I'm with you James.

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[Guest]

Like James, I'm no aeronautical engineer either, but I've done my fair share of reading on air movement, characteristics, flow, etc, etc. It's my worthless opinion that any difference noticed in the ram air due to hans' design is going to be because of smoother flow, NOT the size of the opening. This is the only place where I disagree *slightly* with James. The stock intake is actually kinda rough, the turns and general shape are smooth but there are lots of little spots that create turbulence and make the flow a little rough. With the monster intake I'm willing to bet that there is a bit more of a "howling" noise when the throttle is opened up. Kawasaki also has to consider intake noise and they wanted the bike to be somewhat quiet during operation so they probably sacrificed a few ponies for the quiet intake.

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[Guest]

Just some food for thought. When I went to the Dyno with ZeeBeast

his bike was totally naked. No snorkel. He made a run or two and then

tried it with the snorkel on and his bike made about 5 more horse's.

I think the stock snorkel is probably perfect.

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[INhondo]

Hey zx12richard, when you were running the stock snorkle. Were both pairs of resonators intact? Or was one/both sets removed?

Candy Persimmon Red may be slower, but I'm trying!


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