capt10ed
Expert Class
Posts: 327
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posted January 03, 2010 08:21 AM
reliable stroke for 12,200 rpm?
I have a 1290 and thinking about stroking it, what length stroke would be reliable reving to 12,200?
Not raced...
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2014 Loring AFB 14 runs over 200mph
with a best of 208.1 in 1.5 miles
and 204.5 in the mile.
  
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almost_les
Zone Head
Posts: 590
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posted January 04, 2010 07:22 PM
depends if the name of the engine builder is Karl
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entropy
Moderator
Posts: 8671
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posted January 05, 2010 10:19 PM
lotsa 4.6, even 5.0mm strokers live for a long, long time.
"reliable" is a relative term, every performance mod cuts down on reliability.
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Shane661
Needs a life
Posts: 11494
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posted January 06, 2010 04:03 AM
 Edited By: Shane661 on 6 Jan 2010 12:03
quote:
I have a 1290 and thinking about stroking it, what length stroke would be reliable reving to 12,200?
Not raced...
The first thought that comes to my mind is:
If you are not going to race it, why rev the piss out of it?
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capt10ed
Expert Class
Posts: 327
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posted January 06, 2010 06:14 AM
One reason is I LOVE hearing that wail!!
The second reason...
One of these days I want to go to Maxton and believe having the extra revs while gearing up (higher numerically) should help get a couple of MPH's.
The final reason
I LOVE the wail!!!
____________
2014 Loring AFB 14 runs over 200mph
with a best of 208.1 in 1.5 miles
and 204.5 in the mile.
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almost_les
Zone Head
Posts: 590
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posted January 06, 2010 01:27 PM
buy an r6
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KZScott
Needs a life
high on speed
Posts: 7235
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posted January 06, 2010 03:52 PM
4mm should be plenty safe(if done right) and lots of extra tq. my current build plan is to add the 4mm to my 1287 (makes a 1380) and rev it to 12700
12200 is nothing for Karl  , 12900 starts running into issues with valve float with BIG cams IIRC
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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
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capt10ed
Expert Class
Posts: 327
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posted January 06, 2010 08:46 PM
WOW...Is Karl really reving his Big block to 12,900?
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2014 Loring AFB 14 runs over 200mph
with a best of 208.1 in 1.5 miles
and 204.5 in the mile.
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entropy
Moderator
Posts: 8671
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posted January 06, 2010 10:36 PM
Edited By: entropy on 7 Jan 2010 06:37
quote:
WOW...Is Karl really reving his Big block to 12,900?
Yep, and bending valves. Pistons don't much like hi rpm either.
12,400-ish seems OK, maybe...
if you wanna "hear it wail" (and I do too), do not stroke it unless you just LOVE pulling the motor out.
capt, do you build yr own motors??
Karl
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2000redrocket
Pro
Posts: 1662
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posted January 08, 2010 08:41 AM
before you go to maxton with sort of short gearing to rev the engine higher make sure on a dyno what your power range looks like to get a idea if you can give it a try and pull it off. i know dynos will not simulate real workd loads and ram air should fill in some lack of torque at the higher rpms but if it falls off at 11,500 than no benifit to go to 12,200. you will have lots of fun figureing it out though i bet.
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supra5677
Pro
Posts: 1279
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posted January 14, 2010 08:55 AM
that's easy. The zx12r has a very small 55.4 mm stroke. This makes it only 0.4mm larger than a zx10r. I have my rev limiter set to 12,200 and bang it easily without damate. Stay under 4300 fps.
supra
btw where do you make peak horsepower?
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capt10ed
Expert Class
Posts: 327
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posted January 15, 2010 06:15 AM
I had my 04 ecu modified by Dave O for 12,200redline , peak power is made at 11,700 and then flattens.
____________
2014 Loring AFB 14 runs over 200mph
with a best of 208.1 in 1.5 miles
and 204.5 in the mile.
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