Y2KZX12R
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posted February 18, 2008 05:34 PM
ZRX Cylinder head development....
Theres no ZRX forum on here so i'll just post this here...
We about to start developing a (much needed) cylinder head for the ZRX and hope to have a finished design for the end of march.
I'll post more as progress is made.....
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oldkawboy
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posted February 18, 2008 06:27 PM
Hey Jim,
I joined the ZRX Owners Association last year when I bought mine, they have a bunch of hot-rodders who have helped me out while I was building my turbo bike.
There is a ton of n/a guys always looking for more power so you may want to make a post there too. Just go to ZRXOA.com
I wonder how much port work would help me out........hmm. :-)
Maybe a package deal, my ZX12R n/a head and ZRX turbo head???
Dan
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krexken
Zone Head
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posted February 18, 2008 08:43 PM
Jim, I've got a donor 1200 head on the way to me but he wants big valves put it it. Will that be a problem or do I need another donor?
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Y2KZX12R
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posted February 19, 2008 03:48 AM
Dan, thanks for the tip, I've been lurking on that board for a while. I'll have to sponsor the board to make a post about the head offerings for the ZRX. Which I may do in a month or so when the final product is ready. But until then maybe someone else might mention something about it. 
Call me on that "package deal" we can figure something out..... 
Ken, not a problem. We can do big valves with the porting. I'm doing the initial testing and calcs now to see what the effect will be of putting big valves in the ZRX head. If the velocity calcs and numbers work out then we will be doing bigger valves with the porting. But right now I don't know if it's going to actually be beneficial. Sometimes the velocity at valve closing is too low with a particular cam lobe, stroke/rod, and seat timing, etc. to make good use of a larger valve. But we shall see.
Did you get the other heads ok? Did you check out those seat shapes? Sussshhhhh!!! Don't let anyone else see them...
LOL, just kidding, its just a matter of time before one of these heads falls into spying eyes and the seats are copied..... That's just the way it goes.
I'm just waiting and watching to see when "c" and "w" start doing real valve jobs that will actually be worth a shit.
It's so hard to believe some people know (by the looks of what I've seen) absolutely nothing about valve jobs (and port velocity) and get away with it. The guess and test method.
This whole bike head porting business needs a good shake up... and when spring hits, judging by what we have tested on the dyno, and these heads (busa mostly) start going down the track some people are going to take notice.
The jokes over.
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krexken
Zone Head
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posted February 19, 2008 01:56 PM
I've been bragging to a few of my customers on your work. Seats look terrific. The head you just finished is a 1278 which is pretty big for a zrx so I'm hoping for good results. I may have even lost a porting customer to you. Said he lives about 30 minutes from you.
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Y2KZX12R
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posted February 19, 2008 05:12 PM
Fred, yes he lives a few towns away. He has an 03 zrx and dropped off the head for CNC porting, and a valve job. Thanks Ken.
This head is an excellent canidate for porting. The short turns will respond very well and the cross sectional area is small.... was designed to boost midrange but is on the small side when you put big cams in and a big bore etc.
We should be able to get large power gains out of this head.
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Y2KZX12R
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posted April 01, 2008 05:03 PM
Just a quick update.....
Were planning on cutting the first "production" zrx head later this week. Then some testing to verify the final design.
We should start cutting customers heads in a few weeks.
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Y2KZX12R
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VincentHill
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posted April 01, 2008 05:14 PM
Good to hear about this! You know I also have a serious ZRX with a proto type Step Hindle, ZX11 Cams and a few other things done to make 144 SAE HP and 148 STD HP!
Stock Head and Internals!
I may have to go to the ZX11 valve train and see you!
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Y2KZX12R
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posted April 01, 2008 05:22 PM
Vince, we are working on a Mini head also.
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aliveagain
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posted April 01, 2008 06:10 PM
quote:
Vince, we are working on a Mini head also.
you just had to tease him didn't you?
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I wondered why the baseball kept getting bigger. Then it hit me.
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VincentHill
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posted April 01, 2008 06:47 PM
quote:
quote:
Vince, we are working on a Mini head also.
you just had to tease him didn't you?
I did not need to know this! I already cannot drive her car and she loves it! How much more than 200 do we need?
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aliveagain
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posted April 01, 2008 07:13 PM
quote:
quote:
quote:
Vince, we are working on a Mini head also.
you just had to tease him didn't you?
I did not need to know this! I already cannot drive her car and she loves it! How much more than 200 do we need?
Until it's too much and then it's just enough! 
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I wondered why the baseball kept getting bigger. Then it hit me.
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oldkawboy
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posted April 02, 2008 04:18 AM
When it leaves black marks from turn to turn,,,,,,,then it's enough!
Dan
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VincentHill
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posted April 02, 2008 04:08 PM
quote:
When it leaves black marks from turn to turn,,,,,,,then it's enough!
Dan
Just so long as the "Black Marks" are not from me Falling Off! 
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Y2KZX12R
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posted April 03, 2008 04:26 AM
quote:
Just so long as the "Black Marks" are not from me Falling Off!
LOL
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Y2KZX12R
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Y2KZX12R
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posted April 08, 2008 05:06 PM
 Edited By: Y2KZX12R on 8 Apr 2008 18:13
We just finished up the development of the ZRX-1200 head this week and cut and assembled the first one. I'll post some flow sheets in a few days and some dyno sheets in a few weeks after dyno testing.
This is a stage 1 design for good midrange torque but it will give the ZREX some stomp up top.!!!!
We struck a compromise between keeping good midrange torque and making big power up top. The port velocitiy is key here as in all 4 valve bike engines.
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Y2KZX12R
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posted May 13, 2008 07:14 AM
Here is the flow sheet for the stage 1 zrx1200 cnc ported head.
Port velocity at 28" at the MCSA is 320 fps lowered from 333 fps. At 330fps at 28" the port will go into sonic choke on a running engine.
With this port the head will be at about 330 fps at red line on a 1224cc zrx1200.
So the head wil work excelent on a stock displacement engine as well as a 1224. In either case the head will make better use of the aftermarket cams available.
Dyno charts will follow soon. The first test will be a 1224 with yoshimura cams and stock carbs.
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VincentHill
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posted May 13, 2008 01:29 PM
OK, Y2K, My question is since this is a 1200 Head for a 1156 CC Engine (What ever the CC is stock up to 1224) how would this work on the 1056 ZRX 1100??
Also what is the price for this work?
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Y2KZX12R
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posted May 14, 2008 03:51 AM
Vince, I'm not sure the heads are the same from the 1100 to the 1200. I've been told there different but I havent seen one. I've been told that the head bolt and dowel locations are different? In which case I cant mount an 1100 head on the machine.
I havent digitized a stock 1100 port so I dont have the data on it to do the velocity calcs at the MCSA.
Disassembly, clean, bead blast, weld exhaust inj holes, cnc port, valve job, hand blend, resurface, assemble, new viton valve seals, vac check valves. $995
Thats the same price as the Busa, 12r,or zx14 head.
That price doesnt include shimming the valve lash. The head is shipped without the cams,buckets and shims.
But we can reshim the cams for you also. Most of our work is from other shops and they do the shimming themselves. We have springs and TI retainers in stock as an option also.
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VincentHill
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posted May 14, 2008 05:12 AM
I cannot imagine having to pay anyone to shim my cams! Not a bad price for a proted head that you KNOW is flowing more! maybe we (Dan and I) Need to talk to a few people to see about an 1100 Head!
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Y2KZX12R
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posted May 14, 2008 09:25 AM
Vince, can you verrify the differences in the head bolt locations and dowel pins?
I may be able to modify the fixture plate to accomidate the zrx1100 head. ????
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VincentHill
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posted May 14, 2008 09:52 AM
quote:
Vince, can you verrify the differences in the head bolt locations and dowel pins?
I may be able to modify the fixture plate to accomidate the zrx1100 head. ????
Should be easy to do with so many people on ZRXOA having both bikes! I will get back to you
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KZScott
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posted May 14, 2008 02:58 PM
find someone with 2 headgaskets
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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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VincentHill
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posted May 14, 2008 03:53 PM
Y2K I found a ZRX1100 Head in Ohio! Let me know if you want me to ship it to you and when I I will get it done About how much Peak Power do you think I will end up with> As I stated I have 144 SAE HP with a ZX11 set of Cams and step tube Hindle Prototype 4-2-1 and a Large Filter Open Air Box
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Y2KZX12R
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posted May 15, 2008 04:04 AM
Good idea Scott.... Better yet, Vince do you have a used head gasket you dont need for the 1100? I can overlay it and seewhat the diferences are.
Most likely I can modify the plate I have to work with both heads.
If I had to guess, It should make 153-161 or so hp on 1156cc depending on compression and cam selection.
On the 1224 the stock carbs are choking the engine. If your carbs are the same size you should be good to about 160 hp before they become a major factor.
Thinning the throttle shafts works well and doesnt cost anything if you di it yourself.
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