KZScott
Needs a life
high on speed
Posts: 7235
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posted March 19, 2008 06:35 PM
measuring crank bearings?
I was testing out my new digital mic and ran into something i wasnt expecting...
do the bearings get progressively thinner as you get closer to the end of the curve? as in thickest in the middle?
i got consistant results measuring two NEW bearing inserts. each time the "edge" was thinner(under spec) and the middle was right on the min spec.
temp in the shop is about 12C (53F)
Karl, Tim, Jim? anyone?
thx!
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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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entropy
Moderator
Posts: 8671
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posted March 19, 2008 08:38 PM
yep, they are thinner near the split.
some fun, measuring stuff!!!
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This moderator uses moderation in moderation
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KZScott
Needs a life
high on speed
Posts: 7235
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posted March 19, 2008 09:23 PM
good to know 
ill measure them all in the middle 
yup i like my new toys 
____________
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
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted March 19, 2008 09:53 PM
We set my bottom end up for around 1.5 to 2 thou, cant remember what.....
but the bearings were pretty much what the book said they would be.........
I got lucky, browns on the rods, and browns on the crank........
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
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Syed Leathers
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KZScott
Needs a life
high on speed
Posts: 7235
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posted March 19, 2008 10:25 PM
is there anyway to get oversized bearings? my uncle suggested that(drag car guy) for the bad crank in dads bike. one rod journal is a bit small... we have a brand new crank, but just curious....
____________
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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woppî
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Posts:
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posted March 19, 2008 11:42 PM
@ KZ
Nice New Toys !!!!!!!!!!!!!!!!!!!!!!
woppi
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted March 20, 2008 04:53 AM
No oversize bearings, that would be too easy......
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
Catalyst Racing Composites
Conway Cycle
Syed Leathers
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KZScott
Needs a life
high on speed
Posts: 7235
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posted March 20, 2008 06:44 AM
quote:
No oversize bearings, that would be too easy......
chevys have it all....
____________
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
|
ninja12
Needs a job
Posts: 3310
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posted March 20, 2008 09:19 AM
you may be able to use a small rod marked (none) and make adjustment.
small crank (none) and small rod (none) = black bearings
blue would be oversize.
Let us know how it works out.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted March 25, 2008 04:26 PM
As Karl stated they do taper. This is to account for rod "pinch" at high rpm and in some cases to meter oil flow thru the journal, and it also helps with slight rod cap misalignment issues and reduces oil scraping from the journal.
You can resize the rods to make the bearings slightly tighter. But this has limitations unless you want to get into custom trimming and fitting shells. That takes some skill and a special lapping block. Not recomended.
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Y2KZX12R
CompetitionCNC.com
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KZScott
Needs a life
high on speed
Posts: 7235
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posted March 25, 2008 07:52 PM
thx Jim. that last stuff is way too complicated for me. we are going to run the new crank, and let the other one sit on the shelf till it gets sent away to become a stroker....
____________
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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