biggmoinc
Zone Head
Posts: 747
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posted January 18, 2012 07:42 AM
curious
Since stock valves are maintained in a head for smaller bigbore (1270) has anyone ever done a SS head with exhaust port cleaned up, since the intake ports are already fairly good, and stock (degreed) cams? Or is the compression of the milled head combined with the 13.5 1270 kit to much?
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07 ZX14 bmc filter, muzzy m14, 16/44,66",auto shift, 6'3, 204lbs/1.54/3.99/6.03@120/7.8/9.32@147
biggmo@aol.com
  
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Mikkel
Novice Class
Posts: 57
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posted January 23, 2012 05:49 AM
I don´t have problems running pump gas in my 1270 with milled head, unfortunately I don´t remember how much it was milled. Be careful with piston to valve clearance. My 1270 has 2 intake cams set at 108/108, rev. limiter extended 600 rpm (ace performance), no pc, Brocks sidewinder. Best 1/8 mile et is 5,59 126.6 mph under ideal conditions.
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KZScott
Needs a life
high on speed
Posts: 7235
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posted January 23, 2012 06:14 AM
was the 13.5 number gained from actual measurement, or was that just the number on the piston box?
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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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shiphteey
Needs a job
Posts: 2529
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posted January 23, 2012 07:05 AM
bigg, how do you plan on using this bike?
50% street 50% strip?
A.
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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biggmoinc
Zone Head
Posts: 747
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posted January 23, 2012 10:11 AM
Never measured actual, 85% street, im not extending revs, motor coming off next weekend, alot of suggested ideas, guess still undecided, as of now jim will get the head, not sure bout cams,
____________
07 ZX14 bmc filter, muzzy m14, 16/44,66",auto shift, 6'3, 204lbs/1.54/3.99/6.03@120/7.8/9.32@147
biggmo@aol.com
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biggmoinc
Zone Head
Posts: 747
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posted January 23, 2012 12:13 PM
Never measured actual, 85% street, im not extending revs, motor coming off next weekend, alot of suggested ideas, guess still undecided, as of now jim will get the head, not sure bout cams,
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07 ZX14 bmc filter, muzzy m14, 16/44,66",auto shift, 6'3, 204lbs/1.54/3.99/6.03@120/7.8/9.32@147
biggmo@aol.com
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KZScott
Needs a life
high on speed
Posts: 7235
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posted January 23, 2012 05:23 PM
you need to measure actual before work is done. using the exact same forging of pistons, ive put together 3 1287 combos and cr was 12.9: on 1, 13:1 on another and 13.5:1 on the last depending on things like after market valves, squish, and combustion chamber work. they all can alter what the base cr of the piston is. my 9.8:1 turbo piston'd motor was 8.7:1 (on purpose  )
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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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shiphteey
Needs a job
Posts: 2529
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posted January 23, 2012 05:59 PM
I'm going to say that if you're not into revving it that high stock cams on a 12R are honestly pretty damn good.
A.
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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biggmoinc
Zone Head
Posts: 747
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posted January 23, 2012 07:08 PM
So if I used a psi gauge with all plugs out n turn bike over 4 or 5 revolution the reading should b 200 or better on all cylinders for a 13.5 or more cr?
____________
07 ZX14 bmc filter, muzzy m14, 16/44,66",auto shift, 6'3, 204lbs/1.54/3.99/6.03@120/7.8/9.32@147
biggmo@aol.com
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KZScott
Needs a life
high on speed
Posts: 7235
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posted January 23, 2012 07:14 PM
thats not how to check ratio. cams and cam timing will alter readings here as much as different pistons
____________
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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shiphteey
Needs a job
Posts: 2529
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posted January 24, 2012 05:19 AM
Bigg, you are confusing "checking for good compression" with checking the exact compression ratio.
A.
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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biggmoinc
Zone Head
Posts: 747
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posted January 24, 2012 05:50 AM
I see, lol, never done either before, good compression seems fairly easy to check, cr on the other hand.......
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07 ZX14 bmc filter, muzzy m14, 16/44,66",auto shift, 6'3, 204lbs/1.54/3.99/6.03@120/7.8/9.32@147
biggmo@aol.com
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shiphteey
Needs a job
Posts: 2529
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posted January 24, 2012 06:46 AM
Righto.
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
|
KZScott
Needs a life
high on speed
Posts: 7235
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posted January 24, 2012 09:47 PM
when taking it apart to send to Jim. remove cams, remove head. clean up the carbon. level the motor (cylinder deck) rotate motor so 2 pistons are coming up. wipe some thick grease on the cylinder walls. rotate the motor to TDC so the rings catch the grease. carefully wipe away excess grease. you basically just need to make the rings "solid" to make a perfect seal. reinstall head with the same thickness gasket you plan on using. seeing how you have the 1270 i believe theres only 1 off the shelf option, so reuse the old one. if the viton coating is flaking off, maybe put a very very slight smear of grease on it, just barely enough to see. if any squishes out you put way too much. using a large syringe fill up the combustion chambers to the top of the spark plug threads with tinted alcohol. this number minus 1.2ml is your compressed volume.
total volume is Pi x R squared x H + compressed volume. CR= total / compressed
ex , ill just make it easy and do 1270/4 to get the volume of 1 cylinder, and pretend we put 27ml of fluid in
1270/4 = 317.5
317.5 +25.8 = 343.3
343.3/25.8 = 13.3/1 or 13.3:1 CR
just random numbers that are close to what you will be dealing with
after you see where it is, then we can make better suggestions on what should be done
____________
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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biggmoinc
Zone Head
Posts: 747
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posted January 25, 2012 08:10 AM
Wow, I was having a good day til I logged on, I thought I was doing something, swungarms, pcs,plugs, shocks, wheels, nitriys kits, airshifters, engine removal, etc, but u just took me fir a ride! Lol, u made it sound so simple tio
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07 ZX14 bmc filter, muzzy m14, 16/44,66",auto shift, 6'3, 204lbs/1.54/3.99/6.03@120/7.8/9.32@147
biggmo@aol.com
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KZScott
Needs a life
high on speed
Posts: 7235
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posted January 25, 2012 03:21 PM
its not that bad, just gotta have a touch of OCD kick in when youre doing it (careful careful). practice a few times and no big deal
____________
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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