KZScott
Needs a life
high on speed
Posts: 7235
|
posted February 01, 2008 02:49 PM
how much clearance?
when having a block bored and replated for 86mm JE pistons, what clearance spec do i want to give Millenium? this motor will be using nitrous, im not sure if that affects this or if it just affects ring end gap....
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
  
|
johnnycheese
Pro
Posts: 1008
|
posted February 01, 2008 05:46 PM
not more than .003"
____________
Builder and tuner of some of the fastest N.A. and P/A Hayabusas and ZX12 /14 in Texas
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted February 01, 2008 08:57 PM
and not less than?
thx JC!
____________
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
|
posted February 01, 2008 10:40 PM
Like JC says 3-ish seems to be the upper limit
Based on some expert advice, i aim at .0018-.0020. I have a block at Millennium now getting stripped and re-plated/honed to get to this spec.
Unknowingly, i ran one set at about .0012. Everything was OK until a dyno operator did a pull without fully heat soaking the motor. Seized a piston, slung the rod through everything. 100% fukkered motor.
JE piston spec sheet says .0020.
____________
This moderator uses moderation in moderation
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted February 01, 2008 11:07 PM
thx Karl!
____________
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
|
tcchin
Zone Head
Posts: 867
|
posted February 01, 2008 11:11 PM
Have you sent the 86mm pistons to Millennium for reference, along with the JE spec sheet? They will need to know how JE wants their pistons measured so they can set the clearance accurately, or at least within their guaranteed tolerance.
|
entropy
Moderator
Posts: 8671
|
posted February 01, 2008 11:36 PM
quote:
Have you sent the 86mm pistons to Millennium for reference, along with the JE spec sheet? They will need to know how JE wants their pistons measured so they can set the clearance accurately, or at least within their guaranteed tolerance.
VERY, VERY good point.
make sure Millennium knows exactly what you want them to do. Great folks, Kurt called me this afternoon to confirm what i had written on the transmittal of the block to them. According to him, I am "the guy in Texas who is anal about clearances". 
____________
This moderator uses moderation in moderation
|
osti33
Needs a job
Posts: 2973
|
posted February 02, 2008 12:00 AM
quote:
quote:
Have you sent the 86mm pistons to Millennium for reference, along with the JE spec sheet? They will need to know how JE wants their pistons measured so they can set the clearance accurately, or at least within their guaranteed tolerance.
VERY, VERY good point.
make sure Millennium knows exactly what you want them to do. Great folks, Kurt called me this afternoon to confirm what i had written on the transmittal of the block to them. According to him, I am "the guy in Texas who is anal about clearances".
"The guy from Texas who is anal about clearances."
That's pretty funny. Gonna have that beast ready for the mile??
|
entropy
Moderator
Posts: 8671
|
posted February 02, 2008 04:17 AM
yep, with a lil luck i'll have it back on the dyno doing another cam CL test next weekend. The block at Millennium is being brought to spec for a spare. my spare parts is getting low.
____________
This moderator uses moderation in moderation
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted February 02, 2008 01:00 PM
everything is still here, going to ship out monday. thx for the guidance guys. i really appreciate it 
____________
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
high on speed
Posts: 7235
|
posted February 05, 2008 02:24 PM
quote:
JE piston spec sheet says .0020.
my sheet from JE says .0025 ?? your custom 87mm pistons need to be run tighter? or did they change their spec recently?
____________
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
|
posted February 05, 2008 10:36 PM
quote:
quote:
JE piston spec sheet says .0020.
my sheet from JE says .0025 ?? your custom 87mm pistons need to be run tighter? or did they change their spec recently?
i dunno. where does yr sheet say to measure it?
____________
This moderator uses moderation in moderation
|
tcchin
Zone Head
Posts: 867
|
posted February 05, 2008 11:12 PM
If the 86mm and 87mm pistons are from different forging blanks or if the alloy is different, then they may react differently to thermal loads. Or maybe the spec sheet is just different...
|
KZScott
Needs a life
high on speed
Posts: 7235
|
posted February 06, 2008 11:42 AM
"Set clearance to .0025 (.06mm) Some applications may require more clearance. Measure piston diameter .500 (13mm) up from bottom of skirt."
____________
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
|
|
|
HOME
NEW TOPIC