KZScott
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high on speed
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posted December 03, 2008 03:33 PM
valve pockets and os valves
If I run 1mm over size EX valves with JE 1287 pistons would I have to modify the piston to take the bigger valve or are they generally made with slightly larger pockets for os valves?
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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
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VincentHill
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posted December 04, 2008 08:13 AM
YOU "MUST" Specify the valve size! The reason I do not use JE is they missed by 0.004 to 0.009 on a few pockets and it was not a good thing either!
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Made History @ Daytona and still one fast old man!!
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KZScott
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posted December 04, 2008 07:23 PM
IN 33.39mm
EX 28.35mm
got a reply from JE stating the valve pocket diameters are
IN 37.084mm
EX 31.750mm
what do you mean by missed? how did you check?
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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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brickman
Expert Class
Posts: 294
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posted December 05, 2008 05:24 AM
 Edited By: brickman on 5 Dec 2008 13:56
i do a lot of racing down this way. i did not won't to leave that up to long. sorry.
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KZScott
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posted December 05, 2008 05:37 AM
thx brickman ...damn.... I wonder whats causing them to snap? Karl has had good luck with big cams. im just running 2 intakes, and carpenter springs. I may end up just sticking with stock sized valves and bronze seats.... what kind of performance gains were you told the big valves give?
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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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CompetitionCNC.com
Posts: 3762
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posted December 05, 2008 05:40 AM
Edited By: Y2KZX12R on 5 Dec 2008 13:43
Brickman, Ouch
What brand valves and springs are you using?
Do you run Nitrous?
Does it have Bronze seats?
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Y2KZX12R
CompetitionCNC.com
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brickman
Expert Class
Posts: 294
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posted December 05, 2008 05:53 AM
quote:
Brickman, Ouch
What brand valves and springs are you using?
Do you run Nitrous?
Does it have Bronze seats?
i don't know what brand they are. carpenter has done all the work on it so who ever they use. i think bob said ape? but don't quote me on that. and #3 was the only one to have bronze seats. they were put in when it was fixed the first time.
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brickman
Expert Class
Posts: 294
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posted December 05, 2008 06:14 AM
you no the funny thing is i put a stock head on that motor with just a nice port job. stock cams and springs and it done the same thing with the # 3 ex valve? i got some pics of both heads some were. i could email to some one to put up for me.
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brickman
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posted December 05, 2008 06:17 AM
i am off to work . i'll look for them when i get home.
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KZScott
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posted December 05, 2008 07:07 AM
send them to me and ill post them
s_u_fire@hotmail.com
____________
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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entropy
Moderator
Posts: 8671
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posted December 05, 2008 09:08 AM
i missed something...
I am keenly interested in head work, yep.
been doing LOTS of experiments with heads
Just sent one to Jim
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TRNorBRN6001
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posted December 05, 2008 09:27 AM
Yep, I missed it too.........
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TFA 200MPH CLUB MEMBER!
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brickman
Expert Class
Posts: 294
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posted December 05, 2008 12:20 PM
quote:
send them to me and ill post them
s_u_fire@hotmail.com
thanks they are on this pc. should not be hard to find. i'll email them to you as soon as i do.
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brickman
Expert Class
Posts: 294
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posted December 05, 2008 12:32 PM
Edited By: brickman on 5 Dec 2008 20:32
you did not miss much. we were just talking about ex valves. and i had a post up about some work on a motor that i have been having problems with. i done a way with the post. i just felt better with it gone. don't really know why. it ant like my junks fast or any thing.lol
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entropy
Moderator
Posts: 8671
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posted December 05, 2008 12:51 PM
brickman,
if there is a problem w/valves, i've had it 
solved most of em with help from folks here.
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This moderator uses moderation in moderation
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flite leader
Zone Head
Posts: 651
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posted December 09, 2008 04:53 PM
Edited By: flite leader on 10 Dec 2008 00:58
oversize valves are only good if they are as shallow as they can be
sink them into the head & they wont flow anymore that what you took out
its better than your pistons are flycut for the valves youare using
its also a given that you will check that clearance on assembly
which means putting it together & taking it apart at least once
unless you have used that identical parts list b4
otherwise a tapped or broken valve will destrouy
the valves in that cylinder..... at least 1 piston
the head totally & possibly the crank...................................last but not least the cylinder block
no less with you running NOS in some ways not a good idea to increase valve size
you are really gaining HP on NOS not Volumetric efficiency
you ALWAYS want to stay OFF the rev limiter....................ALWAYS ! ! ! ! !
that causes the valves to tap dance off their seats
screws up the air fuel ratio inside any or all the cylinders
which will cause you some problem$
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bend your mind.....
or break your ass...!!
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