Y2KZX12R
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posted June 04, 2010 11:52 AM
BMW 1000r cylinder head pictures...
I thought you guys might like to see what one of these heads looks like.....
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Y2KZX12R
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WRECKSHOP
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posted June 04, 2010 12:48 PM
WOW. Almost near perfect from the factory !!! Looks like a very very nice valve job from the factory as well !!!!
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CrotchRocket
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posted June 04, 2010 12:58 PM
What I like about those pics is that now Kawasaki & Suzuki will have to do the same to compete...
Thank You BMW 
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KZScott
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posted June 04, 2010 03:23 PM
 Edited By: KZScott on 5 Jun 2010 00:02
the combustion chamber is like that from the factory??
looks like a wide step over, so I assume so...
large quench area between the valves eh?
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tcchin
Zone Head
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posted June 04, 2010 08:19 PM
Is it me, or are those some disproportionately large intake ports and valves? Have you calculated any Mach numbers yet?
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Y2KZX12R
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posted June 05, 2010 07:03 AM
Yes those are CNC chambers from the factory. Very nicely done. It looks like a big step over but they are actually quite smooth. A touch of something would remove the step over marks but i don't think there's any power in it.
Yea that quench area is good for NA power but will be an issue with spray or a Turbo. The Busas have a similar problem in that area. The material disappears (melts away) due to the elevated localised temps. Basically the heat cant get to the water jacket fast enough.
The ports MCSA is very large for a 1000. However this engine is biased to make more power up top and rev higher to boot. It has a shorter stroke and a bigger bore than the other liter bikes. The bore stroke ratio is closer to Moto GP specs. The valve size is dictated by two things. The bore and the required localized average velocity of the MCSA.
Its going to be hard to make this head better on a stock displacement engine.
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KZScott
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posted June 05, 2010 07:19 AM
did you get a whole motor or just a head to play with?
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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
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Y2KZX12R
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posted June 05, 2010 01:57 PM
quote:
did you get a whole motor or just a head to play with?
Just the head. There are a few customers with them so far.
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BrooklynNYZX12
Zone Head
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posted June 05, 2010 04:25 PM
CNC chamber from the factory,is BMW the first to do this?
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smokinZX14
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posted June 05, 2010 04:35 PM
I'm guessing ...Brocks head for SS class ?
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tcchin
Zone Head
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posted June 05, 2010 09:25 PM
quote:
CNC chamber from the factory,is BMW the first to do this?
I think some of the Italian OEM's have done this before.
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Y2KZX12R
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posted June 06, 2010 10:13 AM
Edited By: Y2KZX12R on 6 Jun 2010 18:18
quote:
CNC chamber from the factory,is BMW the first to do this?
Its the first that I've seen.
We do a partial CN\C chamber on the busas.
quote:
I'm guessing ...Brocks head for SS class ?
I cant say who this particular customer is. Some customers request anonymity so I have to respect that. Sorry.
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ZRXDean
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posted June 07, 2010 07:30 PM
Thanks for posting the pics Jim, very cool.
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Lucky14
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posted June 08, 2010 06:17 PM
VERY informative!
Do you have any pics of a stock ZX-14 head so I don't have to pull mine to compare? 
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Got_Busa
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posted June 08, 2010 06:58 PM
Very nice...
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dubious
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posted June 08, 2010 08:17 PM
Video of the BMW finger follower valvetrain in action
http://www.youtube.com/watch?v=nsa6kq-qqIE
The angles the levers impart on the valves is a very aggressive acceleration of valve action, giving more time the valve is fully open.
KTM uses similar design on their SXF and XCF DOHC engines from what I understand
KTM also spanks all the competitors HP due their head and valvetrain.
Maybe Jim can elaborate.
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dubious
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posted June 08, 2010 08:33 PM
Jim can you take pics after? how about with valvetrain installed?
how the hell do you adjust the valves? , no buckets, no shims, no rocker adjusters I can see....
looks like the followers tips are designed to be sacrificial wear items?
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natural selection.....
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Some are not worthy of the effort.
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Y2KZX12R
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posted June 09, 2010 03:01 AM
quote:
VERY informative!
Do you have any pics of a stock ZX-14 head so I don't have to pull mine to compare?
I dont have any pics of the 14 chambers... sorry
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Y2KZX12R
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posted June 09, 2010 03:10 AM
quote:
Video of the BMW finger follower valvetrain in action
http://www.youtube.com/watch?v=nsa6kq-qqIE
The angles the levers impart on the valves is a very aggressive acceleration of valve action, giving more time the valve is fully open.
KTM uses similar design on their SXF and XCF DOHC engines from what I understand
KTM also spanks all the competitors HP due their head and valvetrain.
Maybe Jim can elaborate.
quote:
Jim can you take pics after? how about with valve-train installed?
how the hell do you adjust the valves? , no buckets, no shims, no rocker adjusters I can see....
looks like the followers tips are designed to be sacrificial wear items?
The ratio of the finger follower is exactly why the design is better performance wise. Its also has lighter reciprocating weight. When looking at the lift profiles, the area under the curve is greater with the rockers ratio added in.
There are shims under the fingers, just like on a zx11 etc.
The good part is that if you spit a shim it has a place to go and may not be so devastating to the rest of the engine. You may feel a big power loss on that cylinder but you may not crush everything.
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WRECKSHOP
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posted June 11, 2010 07:23 AM
If you look at the "Patent" Kawasaki has filed on the new build of the 2011 ZX-10R their design is very similiar to that of BMW's with the finger followers just a lil bit different. But the 2011 Kawasaki ZX-10R will have finger followers as well......FYI
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Y2KZX12R
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posted June 11, 2010 09:15 AM
Good info, thanks. Do you have a number or a link to the patent?
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ZRXDean
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posted June 11, 2010 10:23 AM
Cool scoop Wreckshop, I'd like to see that too.
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WRECKSHOP
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posted June 12, 2010 01:42 PM
Let me search for it and i will post the link up when i find it....looked at it about two weeks ago !!!
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WRECKSHOP
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posted June 21, 2010 07:29 PM
Heres the link to the Kawasaki Valvetrain Technology with pics: http://www.zx-10r.net/forum/showthread.php?t=89047&page=3&highlight=Kawasaki+Patents
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WRECKSHOP
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posted June 21, 2010 07:32 PM
Kawasaki's Rocker valvetrain system is a lil more advanced than that of BMW's Rocker Valvetrain system.....
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