KZScott
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posted June 12, 2008 06:26 PM
calculating actual compression ratio
ok, im not having much luck cc ing my combustion chambers. (damn air bubbles) instead of doing it that way ( finding the volume of the piston dome/ quench height ect) how hard is it to just assemble the motor (i have to test fit stuff anyway) and fill up the combustion chamber when a piston is TDC? im assuming that i need a degree wheel to find TDC accuratly....
so to double check with all you experts heres what ill try 
thick grease on rings/piston
piston TDC
fill CC from plug hole
volume of bore x stroke devided by:
CC volume minus 1ml (volume of spark plug??? i think DM wrote that in a post?) minus volume of quench height?
thx!
____________
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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tcchin
Zone Head
Posts: 867
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posted June 12, 2008 09:28 PM
Try McMaster #1204K32: Dow Corning 111 Valve Lube/Sealant, 5.3-Ounce Tube, $11.35
It's NLGI 3-4 (really thick) and it will not leak.
I use a polycarbonate plate clamped over the combustion chamber on an assembled head to measure combustion chamber volume. Drill a couple small holes in the plate and use a syringe to fill. If the plate is sealed with grease and clamped in place, you should be able to move the cylinder head around to dislodge the bubbles. Sometimes a little Water Wetter will help reduce the bubbles, too. Also, if the fill ports are drilled in a place where bubbles will naturally migrate (think bleed nipples on a brake caliper), they should be easy to collect and displace.
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entropy
Moderator
Posts: 8671
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posted June 13, 2008 04:23 AM
 Edited By: entropy on 13 Jun 2008 05:25
Scott,
i always determine my CR by filling the combustion chamber as you outline above.
The silicone sealant that Tim mentions is great stuff but regular grease works.
a few comments.
do 2 clys (1,4 or 2,3)
make sure yr valves are tight(no leaks)
with piston down in the hole smear grease/silicone around the top 1/2" on the 2 cyls
rotate the 2 pistons to TDC, the ring will collect the grease and seal that ring/cyl space, wipe off excess
put head on
level the motor F-B, L-R so there is no where for air to get caught
I use tinted alcohol and a burette and fill the cyls thru the sparkplug hole to the top of the threads
plug hole = 1.2ml.
don't need quench height in calc
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tcchin
Zone Head
Posts: 867
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posted June 13, 2008 07:32 AM
Note that you can seal your valves with grease too, if there's any doubt that they're water tight.
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KZScott
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Posts: 7235
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posted June 14, 2008 06:21 AM
you guys fukken rock! 
thank you!
____________
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
|
KZScott
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Posts: 7235
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posted June 14, 2008 09:04 PM
quote:
Scott,
i always determine my CR by filling the combustion chamber as you outline above.
The silicone sealant that Tim mentions is great stuff but regular grease works.
a few comments.
do 2 clys (1,4 or 2,3)
make sure yr valves are tight(no leaks)
with piston down in the hole smear grease/silicone around the top 1/2" on the 2 cyls
rotate the 2 pistons to TDC, the ring will collect the grease and seal that ring/cyl space, wipe off excess
put head on
level the motor F-B, L-R so there is no where for air to get caught
I use tinted alcohol and a burette and fill the cyls thru the sparkplug hole to the top of the threads
plug hole = 1.2ml.
don't need quench height in calc
RESULTS ARE IN!!!! 
I used regular grease(lots on hand when the old man has been working with heavy equipment all his life) as you instructed. i did 2 3 as i put solder on 1 4 to measure quench with the same assembly
each cc filled to top of plug threads gave me 27cc/ml
27-1.2=25.8
[pi(43squared)55.4 ]/1000 = 321.8
321.8/25.8 = 12.47:1 CR
FUKKEN PERFECT!!!! just what i wanted! just barely higher than stock CR (12.2:1)
btw quench worked out in the safe zone too see other thread
____________
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 June 15, 2008 03:08 AM
how close were the 2 cyl's you cc-d?
gaddamn you are fast, Scott!
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KZScott
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Posts: 7235
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posted June 15, 2008 07:34 AM
under pressure, gotta get this done! they looked to be within a couple drops(which is great cause my chamber work was done by hand). i used a syringe with a long tip....i think it was out of some wood chair gluing kit lol. i used alcohol and blue food colouring
____________
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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KZScott
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Posts: 7235
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posted January 10, 2009 11:00 PM
bump. so its really at 13.5:1??
[321.8+25.8] /25.8 = 13.47:1 CR
____________
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
|
KZScott
Needs a life
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Posts: 7235
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posted January 10, 2009 11:04 PM
damn i was spraying 90 hp of nitrous on 91 octane pump gas at that CR.... maybe i wont have the head milled .020" afterall
____________
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
|
entropy
Moderator
Posts: 8671
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posted January 10, 2009 11:12 PM
Chris in Kansas was spraying on top of 15:1+ ...
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rgeorge
Expert Class
Posts: 220
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posted January 11, 2009 09:07 AM
quote:
bump. so its really at 13.5:1??
[321.8+25.8] /25.8 = 13.47:1 CR
Yup.
TOTAL VOLUME at BDC divided by volume at TDC.
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KZScott
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Posts: 7235
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posted January 11, 2009 10:47 AM
Edited By: KZScott on 11 Jan 2009 19:10
damn these motors are tougher than i thought...
one wknd i had put a map in to try and had copied the ign table onto the fuel table somehow. i was running 5 degrees advanced on 87 octane at the time and the AFR was 13.3:1 it ran 149mph. with a really rich setup (mid 11s:1) it also ran 149mph. never had enough time to try a good AFR, but i think it would run 152-153 with 12.6:1AFR
Mr Lovett was using all C-16 though right? (not a mix like i plan on using) I wonder how much timing he was pulling? it was a 1320 SBM motor with how much nitrous?
____________
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
|
entropy
Moderator
Posts: 8671
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posted January 11, 2009 12:42 PM
quote:
it was a 1320 SBM motor with how much nitrous?
a shitload, he was running on the S side of 8.50's
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KZScott
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Posts: 7235
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posted January 11, 2009 12:54 PM
8.43 @170 i think
I wish he was still on the forum... im going to try emailing him again with a few questions.
170 in the 1/4 is a pretty big jump from 161
____________
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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