Y2KZX12R
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posted January 01, 2006 08:35 AM
Y2KZX14R Project... (Muzzy's 1375 kit)
Ok, so now that its decided not to buy the zx14 and to "upgrade" the power output of the ole 0012r. I selected the Muzzy kit instead of gathering all the parts my self, for a few reasons. One, to support a sponsor of this site. Two beacuse a few emails I got from people wanting to build a large displacement 12r this winter instead of buying a zx14. So a readily available kit is a better choice for most. And also because I have heard the quality of the work done on the cranks and cylinders from Muzzys is good.
So I should have the kit from Muzzys this week.
http://www.muzzys.com/ZX1375/index.html
Crunching the numbers I've noticed that the stock cams are too small for making the most hp with this kit. But they will make more torque below 6000 rpm than almost all of the aftermarket cams available. Driveability below 3000 should be excelent with the stock cams. Even better than the stock 12r with stock cams. So this bike being a "street" bike I may keep the stock cams and just do some needed exhaust port work.
I'm thinking of digitizing the finished ports for CNC reproduction.
This would make the ports available to other board members who may want to have the head ported. At this point I dont think its worth digitizing the intake port. But the chamber mods might be worth digitizing. I'll know more after I get the head off and get it back on the flowbench again.
Is there anyone else on here thinking of doing an upgrade to thier 12r this winter?
Also does anyone know if the ports on the zx12r head are all the same from 2000-2005?
I believe there are actually different part numbers later on for the head, but are the ports different?
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Y2KZX12R
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CrotchRocket
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posted January 01, 2006 09:25 AM
Sounds good Jim!!!...I know your going to get a High HorsePower # out of it...Cant wait to read about the progress as you go along!!!
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Jason Miller StreetBike Seminars
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osti33
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posted January 01, 2006 09:41 AM
Sounds like a good project. Keep us updated.
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TRNorBRN6001
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posted January 02, 2006 10:26 AM
Any tricks ya got planned for keeping that beast cool on the street?
Do share, as I am considering the same thing on my 00.
I think the ports are the same but maybe different mounting on out side
for 02 and up.
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TFA 200MPH CLUB MEMBER!
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Ra12r
Zone Head
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posted January 02, 2006 06:47 PM
The motor mounts changed in 02.
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TRNorBRN6001
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posted January 03, 2006 06:12 AM
Are ya staying with the stock rods or going with Carrillo or Falicon?
What are stock rods good for, about 280-300HP?
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TFA 200MPH CLUB MEMBER!
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psycho1122
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posted January 03, 2006 06:31 AM
I heard 500 H.P.
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Y2KZX12R
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posted January 03, 2006 06:42 AM
TRN, Is cooling actually a problem? Maybe some of the guys running the 1375 kits can comment on that. I've been running distilled water 60% and antifreeze 40% and the recomended amount of water wetter in my 12 sence I first got it. Never had any issues.
As long as the head ports are the same then it will work. The mounting wouldnt be an issue. Looking at the mean piston speeds and loads on the rod bolts they should hold with this stroke to at least 13,500 rpm before the loads start to get high. I remember Doug M. as saying they were fine on the street and can take more than you would think.
Has anyone running a stroker found any pinching of the rod big end? Thats a sign of big end distortion that occures before an outright rod bolt failure. But the engine would need to be torn down to detect it.
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Y2KZX12R
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TRNorBRN6001
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posted January 03, 2006 07:05 AM
The Texas summers used to cook my stock 00 ZX12 when sitting in traffic, it
would shoot right up to the red. Can only imagine what a 1270 or 1375 would
do.
500hp thats crazy (must have been one smooth hairdryer), I have seen them
let go with much less HP, especialy on those offset big blocks. I think it went
on the pin end of the shaft, that was a sad day indeed. Them blocks aren't
cheap, I realy felt for the guy, but he is still out there racing better than I ever
could.
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Y2KZX12R
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posted January 03, 2006 10:58 AM
That doesnt sound right to have the temp guage in the red. 100deg. and 90% humidity hear and I was only up one tick mark. Try a ratio of 60/40 distilled water and water wetter. Just use the reccomended amount of water wetter, and save the rest for somthing or someone else. You shouldnt go into the red with a stock 12r.
I assume your fan or fans are working.
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Y2KZX12R
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Y2KZX12R
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posted January 15, 2006 05:24 PM
Has anyone windowed a 12r block yet?
I just designed a 70% increase in window area in the block over the stock window. Block integrity is still excelent.
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Y2KZX12R
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Phantom Menace
Expert Class
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posted January 15, 2006 05:29 PM
From what I understand, simply polishing the stock rods and removing all imprefections on the surface of them will increase their strength and reliability tremendously. The smoother finish reduces friction...
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dougmeyer
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posted January 15, 2006 08:23 PM
Y2
Uh, yeah. Somebody has.
Phantom- Do NOT touch the surface on the stock rods. They are extremely reliable in their stock form. Polshing them alters the case hardness and can induce stresses actually making them less reliable. Sometimes the hardest thing is to leave well enough alone. The stock Kawasaki rods are incredibly good.
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Y2KZX12R
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posted January 16, 2006 03:02 AM
 Edited By: Y2KZX12R on 17 Jan 2006 09:29
Thanks Doug. 
Do you think its worth the effort?
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Y2KZX12R
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posted January 18, 2006 06:35 PM
So tonight all measurements were taken on both the old parts and the new Muzzy kit.
I have to give the Muzzy kit parts an A.
Everything measured up right on the money. All clearances are going to be excelent. No fussing with anything at all.
Theres a little taper on a few rod journals but nothing worth worring about, and well within spec.
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trenace
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posted January 18, 2006 06:46 PM
Edited By: trenace on 18 Jan 2006 18:46
quote:
Has anyone windowed a 12r block yet?
I just designed a 70% increase in window area in the block over the stock window. Block integrity is still excelent.
Y2K, if you could give a brief description of your design that would be much appreciated. I was planning on doing this, and a wiser mind's conclusions on it would be invaluable. Thanks!
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Y2KZX12R
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posted January 18, 2006 06:59 PM
Well on the zx12r the "window" between cylinders is kinda an old row boat shape. and the bottom edge is the top of the lower block main bearing saddle. The top of the "window" is the bottom of the cylinder. So a set of three windows would almost double the effective "window" for flow between cylinders. Thus reducing pumping losses. The engine wont make any more HP it will just "absorb" less.
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GUNNER
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posted January 18, 2006 07:19 PM
I was following you there Jim, but are you saying all you plan to do is enlarge them or add more?
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kawachan
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posted January 19, 2006 09:03 AM
Do tell....mine is about half together right now....!!
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RED NINJAS RULE!!
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Y2KZX12R
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posted January 19, 2006 09:38 AM
There are no windows cut into the stock zx12r block. but there is a window just below the bottom of the block. the bottom edge of the cylinder block makes up the top edge of the window.
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Y2KZX12R
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trenace
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posted January 19, 2006 09:39 AM
Edited By: trenace on 19 Jan 2006 09:43
If I understood correctly, the plan is for the block to acquire windows about symmetrical with the ones below them?
About high high up do you figure they can be cut? (The top point.)
Also on this point, here's something I've never understood... the value of windows between 1 and 2, and between 3 and 4, is obvious as these pistons move oppositely to each other. So air has to fly back and forth underneath them. However, what in the world is the point of a window between 2 and 3?? The pistons are moving the same way, there should be no net forces trying to push air either to the left or right at any time or alternately (that I can figure.) Yet, in some cases I've read of a manufacturer first putting windows of the first sort in, and then in a later year, adding in a window between 2 and 3, and this gets described as an improvement. I don't get it.
Thanks!
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Y2KZX12R
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posted January 19, 2006 09:48 AM
Yea I see what your saying. It makes sence. I dont know what the difference would be with 2 vs 3 windows. But once your all set up on the Bridgeport its just as easy to do all 3. So...
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Y2KZX12R
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trenace
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posted January 19, 2006 10:04 AM
On your deciding how many mm high, if you would please advise of the figure. Thanks!!! 
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Y2KZX12R
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posted January 19, 2006 10:14 AM
I still havent decided on a final height. about an inch by 7/8"
I'll post more on it with pics soon.
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Y2KZX12R
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trenace
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posted January 19, 2006 10:19 AM
Thanks!
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