ZXI Mods
Bobby
If You Take 2 stock zxi 1100 and put on the ultra 1 system on one. The
one with the inland jet pipe would win every time. I Dont know who
benherman or james crone has talk with but I now of plenty of people and
racers who back our products including Brandon Deane #2 Pro BP,Myself #1
Expert Bp, Jeff Jackson #2 Vets BP, James griffith jr top expert
kawasaki rider on tour Ect. Also these shops Langstons performance, Reno
Kawasaki, Jet ski world Austrailia, Rocket Racing, coast to coast,
victorvill kawasaki, Jet Works Ect. Ect.
Best Regards.
Bobby (INLAND JET) KAWASAKIS ONLY
James Crone
Ok Bobby, tell ya what...How about we do a shoot-out between your
pipe and our modified "stock" system? While we're at it, lets strap it to
a dyno and get some numbers. On the dyno your pipe makes more power than
stock OEM up to 4000-4500 rpms (mainly because you've reduced your
stinger size on the back of the main chamber which increases cylinder
pressure ie: torque). Your ECWI use on a triple with a single pipe is
silly. There's very little sonic sound wave principle at work with this
set-up. Try reducing the amount of water near the stinger and you get
VERY little hp above 5000 rpms. But wait, by doing this very thing you
can add a heap of acceleration and low end response..geee, I thought you
wanted more water for better low end? Not on the triple with a single
pipe you don't. The physics is rather simplistic. Our modified system is
the only single pipe design (albiet OEM at that!) that makes hp at the
upper limits of the rpm band. This is because we highly modify the
exhaust manifold. Since you're the only other company (the ATi system is
more of a joke) I can say that. When talking horsepower, the dyno doesn't
lie. And yeah sure, with triple pipes you can make around 30 hp more but
they are VERY peaky. They utilize a "true" sonic sound wave (a tuned pipe
for each cylinder). And how do they work? Just ask anyone who raced a Pro
1200 Kawasaki last year on tour. All top end, no bottom end. Anyone who
knows the Kawasaki triple configuration will tell you the same thing:
When using a single pipe, the exhaust manifold IS the BIGGEST bottleneck
to gaining power at upper rpm levels. No exhaust manifold, no power..no
bullshit.
I got to see first hand how your pipe worked on Kenny Gaans boat
at the World Finals. Not only did it (the Ultra 1 pipe) fall apart, even
with the new spring attachment, but his boat could barely beat a
recreational turn-key ZXi I had on hand. Both motors were identically set
up. Also, one of the bolts that holds the manifold broke too. This is
because of the (two cylinder type) rubber coupler you use causes the back
portion of the pipe to vibrate uncontrollably. And stainless steel just
don't cut it. It tends to crack over time.
I basically built the motor and helped Kenny dial in his ski when I
was in Seattle last summer. It ran much better then than it did at Havasu.
Not intended as a flame but I've tested your pipe (on a dyno and using
Stalker ATS equipment) and we didn't gain much top end with it...
certainly no 15-20hp. Try 10-12 up to 3500-4000 rpms, then very close to
stock at higher rpms. The acceleration was nice, but you can get that by
modifying the stock OEM pipe plus a realistic gain of 10-12 hp at 6600-
6700 rpms where you need it. No exhaust pipe works like magic on a
"stock" boat. A 2 cycle engine is just like any other, it's an air pump.
You have to be able to get more air into a motor, to be able to get more
air out of that same motor. While I'll agree that if you line up 2
identical 1100ZXis and your pipe boat would win, it's more likely it's
out accelerating the stock boat but not much faster on top. I've tested
over $18,000 worth of parts for the 1100ZXis. Only 10% of those actually
worked as the manufacturer claims. Even less can be made to work better
than the OEM supplied stuff. The bottom line is this: If your pipe worked
as you say it does, I'd have them on all our turn-key boats and on my
personal test mule. It doesn't deliver, especially in the reliability
department. Can't beat that OEM pipe for power AND reliability.
James Crone
Performance Engineering
940-321-5865
WMWa...@msn.com
In article <68v54c$1ete$1...@newssvr03-int.news.prodigy.com>,
Hello everyone, In the above article, James makes a reference that a
three cylinder with a singlepipe has very little sonic wave principle
like individual tuned pipes. I would not call myself an expert, but I
know a little about how 2-strokes work, and I have always thought that a
multi-cylinder 2-stroke with one pipe each cylinder had it's own set of
sonic pulses running through the same pipe. If this is not the case, then
how does the length of the pipe affect the powerband charicteristics of a
three cylinder? I am very curious about this and would appreciate any
help understanding this. I am building a 780 Polaris and would like some
advise on which single pipes work well on this engine. It will have
ported cylinders, V-force reeds, Hot seat ignition, waterbox, reworked
carbs and heads. Thanks.
William W
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Tony Ernst
I stay out of the flames: just an info (to verify) I've heard that
Coffman will release a single exhaust for the 1100 motor.
James Crone
Hopefully the Coffmans pipe will incorporate a new exhaust manifold. The
manifold, not the pipe it's self is the main bottleneck to improving
horspower on the Kawasaki Triples.
James Crone
William,
See if you can get a hold of the magazine called Watercraft Power.
The March issue explains in detail how a single pipe, 3 into 1 exhaust
manifold works on a three cylinder application. Page 42.
P.S. If you can't get it, I'd be glad to give you information on how to
subscribe.