posted October 18, 2006 07:16 AM
Raising rev limit What's max safe piston speed?
I haven't seen any posts since I've been here.
Any dis/advantage to raising the rev limit to max safe piston speed?
posted October 18, 2006 08:09 AM
4500 feet per minute
There are ADVANTAGES to rasing rev limit.. My zx12r hit 201mph on the dyno still pullin. It was shut down by the dyno brake.. I wouldnt raise a 61mm stroke motor more than 400 rpms myself..
posted October 18, 2006 07:36 PM
OK, now I know!
thats why schnitz sells the valve springs already!
didn't see valves, or cams but, he has the springs !
zx14 dynojet ign. module.
wonder how this is gonna play out with all of and the zx10r modified PC3.
posted October 19, 2006 03:18 AM
It's not going to work on 10r pc, that's what the delay is, they are redoing it so it will not, my 14 pc came with instructions for the ignition module and stated a complete software update will need to be done for it to work with the ignition module when released.
____________
2006 ZX14, Brock CT-Meg, PC, ignition module, E85, 214 lbs suited, 8.96@152.32 1.46 60'
posted October 19, 2006 03:28 PM
4400 fps @ 11,000 rpm.
Stock tachs are a litle optomistsic, by about 300-500 rpm.
Mine bouces at the limiter around 11,500 rpm , and likely actual rpm is around 11,000.
posted October 20, 2006 05:17 PM
Edited By: zx14_1965 on 20 Oct 2006 18:19
quote:So 11,250@rev limiter stock + 500 RPM w/Ignition module =11,750 @LIMITER?
Safe for 1/4 mile or sustained rpm?
Look at some posted dyno graphs....power decreases once stock peak hp is reached at around 9,900 - 10,000 RPM...at least in my specific case. Raising rev limit does literally nothing for a stocker....do it and you'll float a valve.
Want some extra oomph?...change your cam gear timing....depending on degreeing you can move hp and torque throughout the rpm range.
Any novice can adjust cam timing....
Adj cam gears help
Needs a life
2012 14r In Blue and no Mods!
Posts: 5428
posted October 20, 2006 06:12 PM
Adj cam gears are a must if you want to change cam timing on the 14. and I would have to say you won't float a valve raising the rev 500rpms
posted October 21, 2006 01:13 PM
Edited By: dubious on 21 Oct 2006 14:14
quote:
quote: and I would have to say you won't float a valve raising the rev 500rpms
Maybe, but it's pointless on a stocker.
Not necessarilly true...
an extra 500 rpm may save a drag racer from another up shift in the 1/4 mile.
an extra 500 rpm may allow a top speed racer to pull more MPH.
not likely to occurr with a completely stock bike, but some ignition advance and a good pipe may be all that is needed to utilise an extra 500 rpm, and in the mention arena's may be another advantage
Brocks pipe pulls right into the stock rev limiter, unlike sock exhaust or other pipes with less development.
Nevertheless, I would not advocate extending revs to the general public, as most do not have the funds, desire, or mechanical apptitude to realise that they may float valves, stretch rod bolts and throw rods, or bend valves etc.
The manufacturer made the redline on the tach for mechanical purposes, not to coordinate the color of your bike!
quote:
Not necessarilly true...
an extra 500 rpm may save a drag racer from another up shift in the 1/4 mile.
an extra 500 rpm may allow a top speed racer to pull more MPH.
not likely to occurr with a completely stock bike, but some ignition advance and a good pipe may be all that is needed to utilise an extra 500 rpm, and in the mention arena's may be another advantage
Brocks pipe pulls right into the stock rev limiter, unlike sock exhaust or other pipes with less development.
Nevertheless, I would not advocate extending revs to the general public, as most do not have the funds, desire, or mechanical apptitude to realise that they may float valves, stretch rod bolts and throw rods, or bend valves etc.
The manufacturer made the redline on the tach for mechanical purposes, not to coordinate the color of your bike!
Drag racers - go for it.
As for pipes pulling to redline...stock pipe pulls to redline...maybe not with the most effective expulsion of exhaust but it will redline nevertheless....but I may not be clear on what you're saying on that note.
What's considered a "less developed" exhaust? -- Are you saying that the Brocks pipe continues to develop hp all the way through redline with no drop off in hp? --> (after reaching the peak hp point which is between 9000 - 10000 RPM on a 14 with just a pipe and mapped PCIII) Haven't seen any dyno posts to support that statement...show me the way in case I missed it. If that's an accurate statement then the Brocks pipe is the best out there for a stock 14 motor with just a pipe and mapped PCIII on pump gas.
posted October 22, 2006 01:28 AM
Edited By: dubious on 22 Oct 2006 02:56
Brocks smeg barely tapers off after peak and pulls very hard compared to stock, right to redline.
Heres Brocks chart..
Look at the peak of stock, it holds peak for about 1000 rpm between 9-10k.
Look at brocks peak, it lasts 2000 rpm from 9-11k.
Not only that look at the entire curve, Brocks pounds the stock curve into oblivion because it makes more power than the stocker ever did (peak even) for 3400 rpm, from 7600 to 11 k ! , and additionally MAKES MORE BOTTOM AND MID AS WELL!
Even if you got sloppy and shifted at 8000 rpm, it would outpul a stocker with a good rider shifting at 10000 rpm, keepin the stock bike on the pipe!
If you look at any of brocks charts on his site, you'll see that not only does his pipe eclipse stock peak by 12 HP or more, but where the stock pipe tapers off at 10K rpm, his pull pretty much flat, maintaining close to "NEW" peak right into the rev limiter, and absolutley dominates at redline... like 25 RWHP more at the revlimiter!
It stomps out great peak ponies, but the power under the CURVE is a very dramatic increase! Thats the big deal about his pipes!
His primary tubes are stepped, large diameter.
A rev extender, and some additional timing up top, and it would continue to pull hard.
When I changed my exhaust i noticed the exhaust port is heavilly shrouded right at the end wher the exhaust spigots bolt up.
There is some easy top end power right there, without any parts needed except a new head gasket.
I checked piston to valve clearance and found the head could be milled 15 thou as well.
Good for another 1/2 point of compression.
This motor will reward the owner with some real nice #'s ... over 200 rwhp, on stock displacement.... there's some easy 20 HP left in there.
Cams, porting, pipe = 205 RWHP... SAE !
posted October 22, 2006 09:10 AM
Ohhh no!!!...Here we go!!!
Now we're going to see 14s blow up because guys have to touch things that shouldn't be touched unless you do it right !!!
____________ Jason Miller StreetBike Seminars
*****DragRacers do it better, because they dont cut Corners*****
posted October 22, 2006 09:14 AM
Thats why I said, I would not suggest extending the rev limit for the general public!
11,000 RPM is already 4400 FPS piston speed.
Don't push it, unless you like to gamble, and when you lose....
DON"T BLAME THE BIKE OR KAWASAKI !
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posted October 18, 2006 07:16 AM
holes.
Edited By: 
