NOX
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posted March 20, 2008 06:28 AM
How much xtra compression with thin gasket on a 12
as the title implies, how much extra compression can you get with the thin head gasket?
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entropy
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posted March 20, 2008 06:44 AM
do you know how thin it is??
on my motor taking .010" off block height = about 0.5:1 CR increase
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NOX
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posted March 20, 2008 04:01 PM
Cometic , I think its 18....
Thanks Karl......
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rgeorge
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posted March 21, 2008 06:34 PM
 Edited By: rgeorge on 21 Mar 2008 22:38
I did some quick math
83mm piston displacing 300cc,
12.2 CR with .023 head gasket,
calculated chamber volume (total) is 26.78cc
switching to a .018 gasket will reduce chamber volume by .687cc
new CR should be about 12.5:1
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NOX
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posted March 21, 2008 08:35 PM
Then other words, not worth messing with when I have a good stock one right here.......lol
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entropy
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posted March 21, 2008 10:01 PM
i thought the stock HC was more like .030????
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entropy
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posted March 22, 2008 03:50 AM
quote:
I did some quick math
83mm piston displacing 300cc,
12.2 CR with .023 head gasket,
calculated chamber volume (total) is 26.78cc
switching to a .018 gasket will reduce chamber volume by .687cc
new CR should be about 12.5:1
hey Rob,
you coming down to the Mile next weekend????
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rgeorge
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posted March 22, 2008 08:11 AM
The .023 number (compressed thickness) is just what I remembered it being. I have been known to remember things incorrectly in the past.
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KZScott
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posted March 26, 2008 10:16 AM
NOX, i heard somewhere that you could take the middle piece out of the gasket for the same effect
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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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NOX
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posted March 26, 2008 01:29 PM
Hmm.....doesnt sound too reliable to me......
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KZScott
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posted March 26, 2008 03:27 PM
Edited By: KZScott on 26 Mar 2008 16:28
why dont you take out the block shim and or shave the head a bit?
____________
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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NOX
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posted March 26, 2008 03:38 PM
I was just playing with ideas........
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KZScott
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posted March 26, 2008 04:05 PM
IIRC taking out the block shim makes a stock motor 12.8 to 1 or so.... you might need cam sprockets tho
you could probly get over 13 to 1 with stock parts if you did it right...
____________
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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NOX
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posted March 26, 2008 07:05 PM
1, how can you do that? Do you just seal the block with Yamabond?
2, why would I need sprockets?
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rgeorge
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posted March 26, 2008 07:33 PM
quote:
2, why would I need sprockets?
Removing the shim puts the cams that much closer to the crank. Since the length of the driving side of the cam chain hasn't changed, it causes the cams to be slightly retarded.
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ninja12
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posted March 26, 2008 08:51 PM
same as thinner hg or shaved head!
You don't have to but it put things back to spec.
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MadMike
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posted March 26, 2008 09:26 PM
quote:
i thought the stock HC was more like .030????
Yep I believe so...
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NOX
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posted March 26, 2008 09:43 PM
Not sure I want to leave out a gasket that is supposed to be there.....
That sounds unreliable....
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entropy
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posted March 26, 2008 11:10 PM
quote:
Not sure I want to leave out a gasket that is supposed to be there.....
That sounds unreliable....
Nox
Depending on which cyl clock i'm using, i'll run .010" or .005" or no base gasket at all to get the quench where i want it.
I don't use any sealant and don't have leaks around the base of the cyl block.
your results may vary
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NOX
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posted March 27, 2008 04:45 AM
Hmmmmm
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entropy
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posted March 27, 2008 05:16 AM
things that make you go "hmmmmmmmmm..."
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NOX
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posted March 27, 2008 05:40 AM
Hey, whats a cyl clock?
LOL
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NOX
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posted March 27, 2008 05:41 AM
And will cast pistons stand the abuse......hmmm
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KZScott
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posted March 27, 2008 08:23 AM
oh you know you want to have a "stock" motor with more compression... just try it and let us know how it goes
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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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NOX
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posted March 27, 2008 12:27 PM
I prefer the term, stock internal parts........, never said from what year, or what was left out......
LOL
Above all else, I like reliability......
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