dougmeyer
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posted January 06, 2011 07:31 PM
Don't think so, Shane. I would describe surging as being different. Floating would be from a loss of valve control resulting from it not following the cam profile.
Surging would be induced by the valve spring itself, probably a harmonic at one or more specific points in the range, not necessarily at max RPM.
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Shane661
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posted January 07, 2011 08:59 AM
 Edited By: Shane661 on 7 Jan 2011 17:12
Well, however you want to look at it...or whatever the proper semantics may be...it looks like a loss of valvetrain control for one reason or another, and related to the springs, correct?
What is it that keeps the valve actuating properly, and following the cam? The springs. And even with aggressive cams, with the proper springs you can usually control the valves, correct?
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Hells Dark Lord
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living life, and loving it.
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posted January 10, 2011 08:18 AM
quote:
Here's the skinny
http://roadracingworld.com/news/article/?article=42964
If this were the case, its not a smart thing for KHI to buy back all the sold units. It would be smarter for them to replace the valve train and cam shafts like the article said and let the owner retain possession of the unit. The will lose a lot of money if they buy back all the sold units when they could fix them in any one of their shops around the world. Doesn't make sense to me.
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fish_antlers
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posted January 10, 2011 10:44 AM
apparently the number of sold units is in fact quite low. The actual "fix" is taking place this week in Irvine. All Canadian units have been repaired. Unknown about the rest of the world and how they are dealing with it.
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VincentHill
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posted January 14, 2011 08:25 AM
Shane, WHen I read the work Surging (as in the Springs), to me it meant that maybe they had a Frequency problem that while the Valve was at rest, the springs were still moving / vibrating / surging. This is why the all have secondary valve springs to damp this frequency and maybe they had to change the springs to something with a different profile (Like Oval as opposed to Round) and mayne the Camshaft Profile was causing this and it needed to be changed also.
My feeling is that not every cam profile can be used and controlled with a spring. If this were true, then the cams would not need to lift and close ramps to control the Accel and Decel of the valve
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Shane661
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posted January 14, 2011 08:29 AM
Edited By: Shane661 on 14 Jan 2011 16:48
Good points, Vincent. On oem cams I would suspect that they can control those with the right springs...the problem is that they have to look at things like valve adjustment intervals, and very long-term wear. Stuff that racers don't have to worry about as much because they are just after performance, and inspect their parts frequently.
As for Kawasaki's wording of the problem...who knows. Sometimes they may even pick the inappropriate term so as to "dumb" things down for the non-tech types, imo. It just looks like a spring issue, one way or another.
I imagine it is a delicate process to find a spring and materials that go 15k between adjustments, while on a .400 lift cam with aggressive ramps!
Shane
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Kangpow
Expert Class
Posts: 144
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posted March 02, 2011 07:13 AM
That makes me glad I am still driving my 03 ZX12
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SteveWFL
Moderator
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posted March 02, 2011 08:00 AM
quote:
That makes me glad I am still driving my 03 ZX12
i thinki the zx10 is fixed by now
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2010 Concours14
'08 R1 YAMAHA
ZX14 gone!
CBR600RR track bike
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Flame On
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Fuel Air & Spark
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posted March 02, 2011 10:35 AM
ZX-10R's Problems Solved
According to Kawasaki engineers, the problem with the ZX-10R arose when they found a "possible surging of the intake valve spring when the unit is operated under unique riding conditions, such as on a racetrack. The surge could cause the intake valve to seat improperly, resulting in poor engine performance."
Kawasaki is replacing the camshaft, valve springs, and spring retainers to prevent the valve surging - and none of the changes affect engine performance, Kawasaki says.
http://www.cyclenews.com/articles/industry-news/2010/12/29/zx-10r-s-problems-solved#article
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oldkawboy
Needs a job
Posts: 2125
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posted March 02, 2011 01:07 PM
We'll have them in Daytona for the demo's starting this Saturday for Bikeweek.
Dan
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RICH CRAFT 1
Zone Head
Posts: 681
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posted March 02, 2011 02:32 PM
Will probably know more next Thursday after the Daytona 200 superbike qualifying running on March 12 , there will be a couple of good teams with neu ZX10.
Ken
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Red 06 ZX14 RR
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