cylinder head porting - Kawasaki Forum :: KawasakiWorld.com
 
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post #1 of 15 Old 11-29-2016, 09:07 AM Thread Starter
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Question cylinder head porting

I "think" I know something about porting and CC'ing and have personally done some on a SBC. But I do know that Im not qualified to do zx12r head so Im looking for a place. I would CC my 12r head to know where its starting but no grinding.

The West Coast of Canada has little to offer. The US has some, but most have moved on to other bikes. I would think a canned CNC porting job could be found, id be shipping it so where in US doesn't really matter, I am going to Glasgow for a month soon so I could take it with me if there was a well recommended place.

I have a fresh 1287 with 13:1 JE's, kent kaw23 (9.88@260, 9.37@258) 108lc cams, adj sprockets, bear short stacks, akra pipe, advanced timing, PC5 w. O2 sensor. Stock rods/crank with 25K on them. Billet clutch and undercut trans.

I have not yet flashed ecu for speed, timing, rpm extend (maybe better rods/bolts 1st) and a new oil pump.

So its winter and while its apart, I was looking for appropriate porting to augment the +3mm of the 1287 including gasket matching, bowl blending, and un-shrouding of valves in CC, upgraded springs but not really high pressure.

One place I talked to says they don't enlarge the CC due to the loss of CR, but Im already up .8 with the piston change!
2nd place said stage II $2500 comes with their supplied cams, I want to use the cams I have already obtained which I believe to be reasonable for my build.

I assume JE 13:1 is with stock chambers which are what volume with oe HG? I plan to measure and adj. squish with the base gasket and thin HG or surface head to restore CR.

For those that have done this more than once... How much increase in CC volume to properly un-shroud intake valves, or what should be done? What is a reasonable squish target 0.035? PtH clearance? PtV clearance target value?


Who to use, do I have to specify and they work to spec or do they not like being told, and they know zx12r best?

Prices range $1000 - 2500 and probably more for add-ons like springs, seals, ti, seats, oversize valves etc etc. What should I be paying for what I need? Stick with CNC porting or do they just rough it with CNC and finish by hand anyways?


Goal: Drive to work, scare me when I want it too, drag it to see what it/I will do, some LSR runs would be fun, track days. Im not looking for the ragged edge - I gave up on the stroker plan for this build.

Last edited by weedy64; 11-29-2016 at 11:37 AM.
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post #2 of 15 Old 11-29-2016, 01:34 PM
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I port my own heads by hand, but if you want a cnc head i would send it to jim gilnack and ask for his stage 2 with standard valves or try bob carpenter

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 249.5 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #3 of 15 Old 11-30-2016, 03:47 AM
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I have cylinder heads that are 4.650" to 4.590" thick. The 4.59 heads have been milled.
My 1287 with a .030 HG and 4.650" head, oem dished valves and JE pistons....gave me a measured 11:1 CR.

You should do a baseline CR measurement first.

Do you have a old 86mm HG?

cmg
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post #4 of 15 Old 11-30-2016, 09:08 AM Thread Starter
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Wow. I would have expected more, but you didn't specify the JE # so I cant tell if they are different from mine. Mine are JE 192315

I know it all bears measuring and CCing to know for sure, but I kind of expect a 13:1 to be closer than that if I haven't cut the CC. I guess Ill contact JE for the specs surrounding this, and cc my head before I get started.

I do not have a 86mm head gasket yet, I just bought the block and pistons and they are sitting quietly on a shelf.

Thanks for the heads up

KZ: $2500usd for stage 2 from CompetitionCNC, more than I want to spend on an engine for street fun.
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post #5 of 15 Old 11-30-2016, 01:33 PM
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cmg
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post #6 of 15 Old 11-30-2016, 01:49 PM
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Quote:
Originally Posted by weedy64 View Post
Wow. I would have expected more, but you didn't specify the JE # so I cant tell if they are different from mine. Mine are JE 192315

I know it all bears measuring and CCing to know for sure, but I kind of expect a 13:1 to be closer than that if I haven't cut the CC. I guess Ill contact JE for the specs surrounding this, and cc my head before I get started.

I do not have a 86mm head gasket yet, I just bought the block and pistons and they are sitting quietly on a shelf.

Thanks for the heads up

KZ: $2500usd for stage 2 from CompetitionCNC, more than I want to spend on an engine for street fun.
my 1287s were around 13:1 when i did 3 a few yrs ago.

2500 is a lot more than i remember it being. ill do a hand ported head a lot cheaper if you want.

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 249.5 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #7 of 15 Old 11-30-2016, 03:46 PM Thread Starter
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Nicely polished rod beam. A common technique for SBCs etc but I thought I read somewhere that it was not recommended for 12r rods. Id like to do similar but have not since reading about it. Bikeland I think.
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post #8 of 15 Old 11-30-2016, 06:00 PM
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Quote:
Originally Posted by weedy64 View Post
Nicely polished rod beam. A common technique for SBCs etc but I thought I read somewhere that it was not recommended for 12r rods. Id like to do similar but have not since reading about it. Bikeland I think.
The crank is even prettier.
Falicon did the work. The rods were done by the previous owner. it may have been done before it was clearly understood that you should not polish 12 conn rods. I'm not sure .
I have it apart to replace them and bump the compression .

Incidentally the pth was about .065" which surely contributes to the low compression value I got.

cmg

Last edited by color me gone; 11-30-2016 at 06:04 PM.
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post #9 of 15 Old 12-01-2016, 01:53 PM
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got a carpenter cnc ported head I might part with one cylinder repaired 4 new seats
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post #10 of 15 Old 12-02-2016, 10:02 AM Thread Starter
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Just a casting? or assembled? pm me with good pics and a price before I spend money on parts or porting.

Thx
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post #11 of 15 Old 12-02-2016, 10:03 AM Thread Starter
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oh and how thick is the head, has it been decked? rats, it sold.

Last edited by weedy64; 12-09-2016 at 10:23 AM.
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post #12 of 15 Old 12-09-2016, 10:22 AM Thread Starter
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my springs suck

I decided to test my OE springs with a small hyd. cyl and gauge, yuk! They are all in the 28-31 psi seat pressure range, lucky I didnt have a dyno test tragedy with that kind of pressure. I think I will change them before upsizing the cam, guide seam good. I found a KW spring kit online to fix it.
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post #13 of 15 Old 12-10-2016, 12:36 PM
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What year is your bike? I have a pair of ported heads for the early models, and may end up selling one. It has a couple nicks from an exhaust cam breaking, but otherwise in good shape.
It was on the 1287 I bought a few years back, and spec'd at just under 14.1 with JE 13.5 pistons.. supposed to be slightly milled but I don't know for sure.

intake side, can get more pics in a couple weeks when I get home.....
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Last edited by texlurch; 12-10-2016 at 12:50 PM.
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post #14 of 15 Old 12-20-2016, 10:12 AM
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I would chat with bob, he will set you straight. He did my head as a stage 1-2 porting, TI retainers, shimmed new OEM springs, for excellent street power reving to 12k rpm. I need to have my ECU flashed to 12.5k rpm to get the full effect as power does not tail at 12k. I have another head I need to send to KZScott for cleanup for a 1287 I have in the works for my loaner 12R. I'm to hoping more economically duplicate my carpenter motor delivery while maintaining the OEM 11.5K limit to preserve it.
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post #15 of 15 Old 01-16-2017, 11:41 AM Thread Starter
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I got it done in Scotland while I was there, looks like a reasonable job. I was happy not to have to send it off in transport at xmas time. Many of my exhaust guides are sloppy, valves are not worn much so I will install new guides and light valve grind and I should be good. I got a KW spring kit (57lb, Ti retainers) so no float issues there. Head cc'd with CR at 13.0 as is so I hope I dont lose too much during the valve grind.
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