ninja12
Needs a job
Posts: 3310
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posted November 15, 2006 08:29 PM
105/105 vs 105/100 cam timing
Those are the two numbers i hear most on the 12.
How does the 105/105 change the power delivery compared to 105/100.
  
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entropy
Moderator
Posts: 8671
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posted November 16, 2006 12:48 PM
Gerard,
I have some info but no straight apples-to-apples comparison; fuel changes, cam type changes, cam CL changes, 1361/1375/1427 changes, weather changes.
Doubt the info would be useful to you, but if you wanna look at a big spreadsheet , you KNOW I will send it to you.
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ninja12
Needs a job
Posts: 3310
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posted November 16, 2006 10:53 PM
 Edited By: ninja12 on 16 Nov 2006 22:54
I'll take your word for it.
Can you give me the short answer,
raise or lower the peak hp?
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supra5677
Pro
Posts: 1279
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posted November 17, 2006 08:04 AM
short answer is closer lobe centers give your more peak power and move the power band up. So 105/105 keeps the exhaust cam open a litte bit longer for more rpm breathing.
The exhaust side of the zx12r has some flow problems due to the desing angle of the exhaust valve to the header. 105/100 will give more torque than 105/105. Im running 105/103 and really like it. But actually you might find better luck with 106/101 as the engine responds more to the intake cam than the exhaust cam.
supra
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tcchin
Zone Head
Posts: 867
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posted November 17, 2006 04:56 PM
A smaller LC number on the exhaust side means more retarded exhaust cam timing (and more overlap), whereas the opposite is true for the intake side.
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psycho1122
Pro
Posts: 1608
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posted November 18, 2006 08:02 AM
For example; I run 105.5 in. and 99.5 ex. on my 2000 1270.
I get 98 ft. lbs. of Torque by 3,800 rpm, 102 ft. lbs. by 5,000 and a Torque peak of 111 ft. lbs. by 7,600 rpm.
190.3 h.p. comes in as soon as 10,000 and holds it to rev limit.
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jessz1
Expert Class
Half the wheels, twice the fun
Posts: 373
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posted November 18, 2006 08:02 AM
In all honesty there will be very little seat of the pants difference between the two. I degreed mine at 105/100 I think.... it has been so long ago. I gained no horsepower but it did flatten the area under the curve a bit and was worth a little over one mph at the strip.
These are just my personal conclusions. No real scientific facts....
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