WRECKSHOP
Expert Class
Posts: 359
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posted December 29, 2009 10:38 AM
Race Machine.Net...LOOK
Hey, Jim @ Competition CNC look at what these guys are doing over at RaceMachine.Net. They are replacing the skulls and this also might help with the ZX-14 cylinder head by having more material in the skull and combustion chamber area.So the port shape and dimensions are correct in that particular area. I heard you speak of this in the 86mm porting thread under the ZX-14 column when you stated that the additional material from the oversize seats gave you somewhat of enough material to transform the turn at that particular area of the port ??? I thought this may also help !!! Let me know....
  
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osti33
Needs a job
Posts: 2973
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posted December 29, 2009 01:41 PM
Like this?
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tcchin
Zone Head
Posts: 867
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posted December 29, 2009 01:45 PM
It looks like the chambers over at racemachine shroud the intake valves quite a bit. I wonder if that's an acceptable tradeoff for more compression.
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ZRXDean
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Posts: 2225
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posted December 29, 2009 02:04 PM
That is really pretty. Looks spendy.
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WRECKSHOP
Expert Class
Posts: 359
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posted December 29, 2009 07:00 PM
Yep thats them...
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Y2KZX12R
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CompetitionCNC.com
Posts: 3762
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posted December 29, 2009 07:27 PM
Yes I saw that they were doing the Busa head Its been popular off and on for years. Some factory heads were done like this also. One that comes to mind is the yamaha xs-650 twins of the 70's. And Porsche did skull inserts also for a while among other OEM's.
I dont know why you would need this on a busa or zx14 head. Maybe on a nitromethane application?
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Y2KZX12R
CompetitionCNC.com
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KZScott
Needs a life
high on speed
Posts: 7235
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posted December 29, 2009 07:45 PM
250 shot at Loring?
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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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WRECKSHOP
Expert Class
Posts: 359
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posted December 29, 2009 10:32 PM
Wow, a 250 shot of Nitrous is huge for a motorcycle engine, right ?
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KZScott
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Posts: 7235
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posted December 30, 2009 04:35 AM
yeah, thats promod power, i doubt they could sustain it for much more than 1320 feet? something tells me a busa or 12/14 with bronze skulls may hold up a bit better?
Jim, how much nitrous would you be using for an extended amount of time to require something like this? i doubt many of us will be going with nitro
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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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aliveagain
Needs a life
Posts: 5033
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posted December 30, 2009 09:54 AM
How is that held in place that it can go through extreme temp change?
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I wondered why the baseball kept getting bigger. Then it hit me.
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WRECKSHOP
Expert Class
Posts: 359
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posted December 30, 2009 09:58 AM
Yeah would the skulls hold up on a Violent nitrous hit of 100-130 shot of N20 ???
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VincentHill
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Posts: 6520
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posted December 30, 2009 10:28 AM
Ducati made Bronz heads that were covered with Aluminum to deal with the heat. This is the first I have seen then done in Modern times now that we have water cooled heads.
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Made History @ Daytona and still one fast old man!!
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KZScott
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Posts: 7235
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posted December 30, 2009 10:43 AM
Wreckshop, thats what they are for
I would assume they are pressed in like valve seats and they are also bigger than the bore so are "held up" by the cylinder
____________
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
Needs a job
CompetitionCNC.com
Posts: 3762
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posted December 30, 2009 04:00 PM
quote:
Jim, how much nitrous would you be using for an extended amount of time to require something like this? i doubt many of us will be going with nitro
I really have no idea.
If you could keep the valves from softening up and stretching like clay?
How long does a top fuel valvejob last? Not too long.
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Y2KZX12R
CompetitionCNC.com
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KZScott
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high on speed
Posts: 7235
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posted December 30, 2009 05:33 PM
1 pass? 
so really bronze skulls are not required on a water cooled head as long as you have bronze seats? its the valves that are the limiting factor?
____________
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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chavcat
Zone Head
Posts: 524
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posted December 30, 2009 06:46 PM
My understanding of the value of a bronze skull is the elimination of dropping a seat as well as no cracking between seats. (potential due to high heat/load/pressure) This has been around in Pro Mod GS1100 based engines for some time.
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WRECKSHOP
Expert Class
Posts: 359
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posted January 01, 2010 11:01 AM
So this is what the NHRA Prostocks bikes have in them ?
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chavcat
Zone Head
Posts: 524
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posted January 01, 2010 02:55 PM
Not sure if Prostock uses these; I doubt it as the Vortex 2 valve head from Rick Ward uses separate seats. Also when Spiderman was running a 2 valve Vortex head on his top fueler this also used separate seats. This woudl be of much greater benefit with 4 valve head.
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KZScott
Needs a life
high on speed
Posts: 7235
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posted January 08, 2010 08:35 PM
I see Sebby sent them 6 heads....something tells me they will be flowing 600hp
____________
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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