Paul2281
Expert Class
Posts: 147
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posted June 06, 2012 12:29 PM
ZX12R RACE CAM ID.
Trying to figure out what cam this is that was installed in the intake side my motor...
ID markings are....
320in
419x5A-AC
08-08
These markings are between #3 lobes.....
Thanks for any help.....
Pulled the cams out because of a knocking noise heard in the head on the left side of the motor....Sounded more like it was coming from the exh. side,but haven`t found the problem yet...Keepers are all intact,springs are together,shims are there.....
Thanks for any info....
  
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Shane661
Needs a life
Posts: 11494
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posted June 06, 2012 01:27 PM
 Edited By: Shane661 on 6 Jun 2012 21:27
The 12R cams are weld ups....meaning, a stock cam is used for the base. You need to measure the height to get lift. Duration is a different story...
Use a good caliper and measure the height of the lobe.
Shane
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Paul2281
Expert Class
Posts: 147
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posted June 06, 2012 01:41 PM
Edited By: Paul2281 on 6 Jun 2012 21:54
Some of the lobes are coming up different....So I`m needing the specs to know what they are all supposed to be....
INT.
#1 L=37.55mm
#1R=37.49
#2L=37.54
#2R=37.54
#3L=37.53
#3R=37.51
#4L=37.55
#4R=37.53
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Shane661
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Posts: 11494
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posted June 06, 2012 01:55 PM
Edited By: Shane661 on 6 Jun 2012 21:57
quote:
Some of the lobes are coming up different....So I`m needing the specs to know what they are all supposed to be....
Are you using a vernier caliper? That can be a little off., measurement to measurement. All lobes should measure the same, that is the cam grinders job.
What are you seeing? Post measurements and pics. Post a pic of your measuring tool.
EDIT: please post in inches...cam specs are not advertised in mm, for bikes.
Shane
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Paul2281
Expert Class
Posts: 147
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posted June 06, 2012 02:20 PM
Thanks for trying.....
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Shane661
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Posts: 11494
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posted June 06, 2012 02:27 PM
Edited By: Shane661 on 6 Jun 2012 22:31
quote:
Thanks for trying.....
Is that a post directed at yourself?? LOL
Measure your base circle and subtract the total height to find lift...
Shane
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Paul2281
Expert Class
Posts: 147
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posted June 06, 2012 03:00 PM
No, you of course.....lol....
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LandspeedLarry
Expert Class
Posts: 234
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posted June 06, 2012 03:57 PM
Looks to be a megacycle cam www.megacyclecams.com pg 48 .385" lift 252 degrees duration at .040. LSL
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Home of the World's Fastest Naturally Aspirated motorcycles.
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KZScott
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high on speed
Posts: 7235
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posted June 06, 2012 04:37 PM
without measuring the base circles, those numbers are meaningless
Larry probly has it right, this is what a set of big cams look like
____________
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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Paul2281
Expert Class
Posts: 147
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posted June 06, 2012 04:41 PM
Edited By: Paul2281 on 7 Jun 2012 00:42
quote:
Looks to be a megacycle cam www.megacyclecams.com pg 48 .385" lift 252 degrees duration at .040. LSL
Yes Larry, exactly right....
Thanks for reassuring that thats what it is I have........
Much appreciated.....
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KZScott
Needs a life
high on speed
Posts: 7235
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posted June 06, 2012 04:49 PM
they may have been reground after that, best to check actual lift. my big cams have a reduced base circle to get extra lift (requires thicker shims)
____________
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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Ken 12r
Novice Class
Posts: 86
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posted June 07, 2012 04:05 AM
A model cams are marked 320 as are a lot of A model parts as it was known as "Project 320"
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www.uklandspeedracingassociation.co.uk
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