Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted April 30, 2002 04:18 PM
Tweaking the Stocker...
Heres a pic of my latest attempt to produce more power with the stock engine in the zx12r.
I've only ridden it once in the rain for a while. It has claped out 207's on it so I didnt beat it hard. They couldnt warm up with air temps in the low 40's wet and raining.
Its hard to believe it was 92 here a few weeks ago.
In the above picture, the intake valve reliefs are cut .015" and the intake cam is at 103 the exhaust cam is at 101 and the block shim is gone bringing static compression from 12.2 to 1 to 12.8 to one. The squish areas are .028"
Notice the burn pattern with the washed out areas from last years chamber rework. I lost the burn pattern pics before the chamber rework.
This is the stock chamber in the below picture.
This is the slightly reworked chamber below.
And another
The pipe.
Below are exhaust spigots for a Yosh race pipe.
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Y2KZX12R
CompetitionCNC.com
   
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krexken
Zone Head
Posts: 732
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posted April 30, 2002 04:55 PM
What's up with the airbox cover? You got something hanging off of it taking up space in there? I unshrouded around my exhaust valves also hopefully making it easier for the gases to find their way out.
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TurboBlew
Moderator
BUSY DOING THE SCHIAVO
Posts: 4590
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posted April 30, 2002 05:47 PM
So whats the verdict?? More hp?? Still runs on pump gas?
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Official Charter Member of the RIDERS OF KAWASAKI MEMBERSHIP REVOCATION CLUB
Also a BadAss Internet Forum Moderator 4 Hire!! Come at me brah!
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 01, 2002 01:57 AM
These plates are just flat, they dont have the reeds and filters in them.
Yea it still will burn pump gas. The dynamic cranking compression is up 18 psi over last year and 7 psi over the year before with the factory cam timing.
I'll post more info as I dial it in. It'll be on the dyno in the next few weeks.
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted May 01, 2002 07:27 AM
.028"? It's gonna hit.
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 01, 2002 07:51 AM
Doug, .028" is close I'll agree. But I ran it all of last season without the block shim and it showed no signs of contact. I havent changed the deck height sence last year so it should be ok.
This year the only real change was advancing the intake cam and cutting the pistons for more piston to valve clearance.
Thats what I'm more nervous about. Right now the piston to intake valve clearance is .029"
I think it should be ok, I've run .035" on 500+ CI chevys with alot more piston "rock" than these tight little pistons.
Do you guys offer valve springs?
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Y2KZX12R
CompetitionCNC.com
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Rocket J
Zone Head
Goes to water over a dummy!!!
Posts: 602
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posted May 01, 2002 08:49 AM
.028?
I hope you don't build up one single solitary piece of carbon in that thing.
Rocket
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If I get any smarter, my head will explode!
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 01, 2002 02:17 PM
Well, I just got back from a good ride with the new combo.
The first real ride with this combo and my initial impresion is good.
This is more like the results I was expecting last year with the porting and shim removed.
The power at 8000 is the best its ever been.
I think 185 hp is a possability. We'll see.
Maybe I'll get some time to play on the dyno this weekend.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 05, 2002 04:28 AM
Some new pics...
A shot of the Halmeter and O2 sensor setup.
Lockhart philips zx-9 TI hangar with spacer.
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PaulVincent
Expert Class
Posts: 135
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posted May 05, 2002 09:03 AM
Y2K, I for one really appreciate all your efforts to get maximum hp out of the 12. Keep up the good work!
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 05, 2002 05:03 PM
Thanks Paul.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 07, 2002 05:57 PM
No springs Doug?
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krexken
Zone Head
Posts: 732
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posted May 07, 2002 06:56 PM
I've got different springs on my intake side. Got them from Lee's performance. Think they may be APE's but not sure. I've got the other half of the set on the bench. I've got access to a tension checker. Give me some heigths if your're interested.
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