eklipse636
Needs a life
ZX-14
Posts: 6046
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posted April 26, 2013 07:40 AM
quote:
Ask me the stack height on any one of the 3 ZX-14's I own... I can't tell you, I have NEVER measured it, because it DOESN'T matter.
Of course, this is assuming you:
1. Don't have a lock-up, slider or multistage
2. Follow the basic maintenance principles outlined in your service manual
3. Use only OEM steels/fibers
4. Use Brock's performance clutch mods and springs ( or cushion, where applicable)
There... that should jack up some Internet bench racers 
Brock
Brock’s Performance
Why doesn't stack height matter?
Once your stack height gets so low, your 60's and 330's will start dropping. It may not have as much to deal with mph, but it will change 60 and 330 times.
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
  
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Brock
Sponsor
Posts: 560
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posted April 26, 2013 12:43 PM
eklipse636,
Because if you follow 2, 3 and 4 - your static spring pressure will always be high enough to provide peak performance. 4 was designed in advance to compensate for clutch wear.
All that is required of the assembler is to install clutches that are not glazed (or warped) and within individual spec's according to the manual.
Brock
Brock’s Performance
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted April 26, 2013 01:47 PM
So you mean your stack height has nothing to do with how the bike launches?
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted April 26, 2013 08:21 PM
So am I the only "Internet bench racer" that has this issue?
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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BobC
Pro
Posts: 1736
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posted April 26, 2013 10:37 PM
For what it's worth: on my first 1100 Kawasaki, going back some years now, I sprinted quarters with it for two seasons and thought the clutch MUST be worn out. So I bought new plates. When I stripped the old clutch there was no measurable wear, some glazing yes but nothing you could measure with a vernier or a micrometer.
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Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles
2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)
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SteddyTeddy
Pro
Posts: 1664
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posted April 27, 2013 05:03 AM
quote:
So you mean your stack height has nothing to do with how the bike launches?
No. Its really all about spring pressure. As stack height goes down so does your spring pressure and thus your plates have less bite. If you perform normal maintenance and check you clutch ever so often before its completely wore down, replacing fibers that are out of spec, you will have consistant performance. Most just run the bike until the clutch starts to slip and then they open it up. By then the entire clutch it toast.
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1badzx12r
Needs a life
Posts: 8321
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posted April 27, 2013 05:45 AM
 Edited By: 1badzx12r on 27 Apr 2013 13:47
when y'all get this figured out . let me know what the secret pressure stack height is . 
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http://www.youtube.com/watch?v=S06nIz4scvI
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted April 27, 2013 06:04 AM
quote:
quote:
So you mean your stack height has nothing to do with how the bike launches?
No. Its really all about spring pressure. As stack height goes down so does your spring pressure and thus your plates have less bite. If you perform normal maintenance and check you clutch ever so often before its completely wore down, replacing fibers that are out of spec, you will have consistant performance. Most just run the bike until the clutch starts to slip and then they open it up. By then the entire clutch it toast.
But what your saying is stack heigh does affect spring pressure, so stack height does affect the launch..
Am I understanding this correctly?
I think we are on the same page, I am explaining myself wrong.
____________
Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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SteddyTeddy
Pro
Posts: 1664
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posted April 27, 2013 06:25 AM
Stack height does affect spring pressure. Does it affect the launch? Well yes if your clutch is wore done to the point to where you now have less than stock spring pressure. Which goes back to Brock's #2 above. Maintenance. I coundn't tell you what the stack height is in my bike. Don't know and don't care. I use different springs to get the desired effect and open it up and inpect a couple times through the year with a lot of use. This is one of those subjects that can be argued from both directions. LOL
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted April 28, 2013 03:12 AM
quote:
Stack height does affect spring pressure. Does it affect the launch? Well yes if your clutch is wore done to the point to where you now have less than stock spring pressure. Which goes back to Brock's #2 above. Maintenance. I coundn't tell you what the stack height is in my bike. Don't know and don't care. I use different springs to get the desired effect and open it up and inpect a couple times through the year with a lot of use. This is one of those subjects that can be argued from both directions. LOL
I wasn't necessarily arguing, just making sure I understood. I don't appreciate Brock's smart ass comment about "Internet bench racers" but, he has a opinion just like everyone else. I'll remember that one next time I spend $1200 on a exhaust.
Maybe muzzy isn't so bad after all.
I'm not saying I'm 10"% right, but I was just saying that doing regular maintance (replacing worn fibers) is the same as checking stack height.
____________
Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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