twin pipe psi???

[super mecano]

Re: twin pipe psi???

okay, a look last week-end(maybe 2 or 3 week-end) on ebay neptune dry pipe for xp 800????? A never have feeback for this pipe?? RPM and HP give this pipe???????
and a never look and shape this twins pipe APE for xp 800???
rpm and HP give this pipe???

I say, snowmobile and watercraft is similar,(2 stroke engine), for performance compagnie , watercratf a need more TORQUE a lows RPM ,is not simalar for snowmobile because snowmobile clucht engage 4000 rpm(and more)
and engine with pipe run very up RPM 8700 RPM for my snowmobile!!!!
the aftermaket compagnie pipe is general speaking is
(more rpm= more HP and loose torque
low rpm = more torque and lows HP)is true!!
a use the software TSR racing !!!Is very good software

[jetracer800]

Re: twin pipe psi???

RPG stands for (rocket propelled grenade) that's what it will do with those pipes as Bill already total yeah!

[super mecano]

Re: twin pipe psi???

RGP, this compagnie is over!!!!

RGP =APE

who have tested APE(RGP)????
A have check other forum for netpune pipe!!!!
this pipe is very good feeback(NETPUNE)


who made test shot out pipe for rotax 800(dyno test)

[hydro X]

Re: twin pipe psi???

The only neptune pipe I have heard to work well was a hand made prototype that pulled 7200 rpms and was propped up to the max.... 66 mph. Others have had results but it wouldn`t have been easy.
Why don`t you get a factory spec 2 and cut an inch or so out of the chamber and get the thing reving?

[super mecano]

Re: twin pipe psi???

The only neptune pipe I have heard to work well was a hand made prototype that pulled 7200 rpms and was propped up to the max.... 66 mph. Others have had results but it wouldn`t have been easy.
Why don`t you get a factory spec 2 and cut an inch or so out of the chamber and get the thing reving?

:emoticont thank for info!!!
I just use this pipe for application recreational!!!!
I don't use for this race!!! rossier pipe and twins psi is good for recreationnal! (stock engine):popc (psi pipe requierd more chassis modification, for remove battery
without removing the pipe twins psi)
first picture
http://img296.echo.cx/my.php?image=hpnx00025ud.jpg

http://img296.echo.cx/my.php?image=hpnx00031jt.jpg

http://img296.echo.cx/my.php?image=hpnx00040ie.jpg

bruce say me, i use application theorie design like snowmobile,.... for more acceleration bruce (psi power)and hooper performance use agressif timming avanced , and use lower compression cranking,
and use 10 port cylinder!!, for beautifuel exemple , look polaris pro 785!!! I use very lower compression cranking(around 135 psi with cheep gauge compression and stock head ratio 12.0, and all win race runaboat!! year 1997!! polaris pro use application performance snowmobile!! Very High rpm for watercratf , rave valve, triple pipe, and lower compression cranking,and this cylinder stock is agressif duration,

I want tested APE pipe (twins)!!! and maybe single psi pipe and stock pipe modifed!!!!
i love make tested!!!
where have more info for all pipe for 800 rotax (sites webs)???
thank guy's :emoticont

[super mecano]

Re: twin pipe psi???

okay, a have a3 picture pipe , TNT pipe what this compagnie???? , single pipe psi and RGP pipe!!!! I don't have similar shap like PSI pipe!!!

side mag my psi pipe have big turn 45 degreé for pass up the PTO pipe!!!

look RGP , this pipe a don't have similar shape



picture modifed for shape is not similar



and PSI PIPE




picture modifed for shape is not similar RGP

[Bill O'Neal2]

Re: twin pipe psi???

RPG= Research Group Performance, Not APE. APE= Arizona Performance Enterprizes.
RPG is from New Jersey
APE is from Mesa Arizona
TNT is Tim Tinan.
PSI is out of Wisconsin.

All of these guys made various 787 pipes. None of them were worth the gun powder to blow them up.

Neptune, is Bo Dupriest's Neptune Racing out of Florida. He made a few 787 dry pipes that did work ok if you could figure out the watering system.

None of the above exhaust systems are still being made. None of them work as good or better than a Factory Pipe Spec 2. Most do not work as good as a stock pipe.

Factory Pipe and Coffman Exhaust systems and Neptune are the only exhaust pipe companies who ever made an exhaust system that actually ever won a national or world finals event in a Sea Doo watercraft that I am aware of. I came close once at the WF's with an APE pipe on a 787 powered HX, but I soon removed that pipe and installed a FPP Spec2 on that HX.

You are totally jacking yourself off with all of those exhaust systems and all of this testing. 58 mph with twin pipes? I have gotten 60 mph out of a 787 XP with a stock pipe. What a joke !

Quit buying all this junk off of ebay. Buy a Spec2 and go faster and be happy.

[super mecano]

Re: twin pipe psi???

RPG= Research Group Performance, Not APE. APE= Arizona Performance Enterprizes.
RPG is from New Jersey
APE is from Mesa Arizona
TNT is Tim Tinan.
PSI is out of Wisconsin.

All of these guys made various 787 pipes. None of them were worth the gun powder to blow them up.

Neptune, is Bo Dupriest's Neptune Racing out of Florida. He made a few 787 dry pipes that did work ok if you could figure out the watering system.

None of the above exhaust systems are still being made. None of them work as good or better than a Factory Pipe Spec 2. Most do not work as good as a stock pipe.

Factory Pipe and Coffman Exhaust systems and Neptune are the only exhaust pipe companies who ever made an exhaust system that actually ever won a national or world finals event in a Sea Doo watercraft that I am aware of. I came close once at the WF's with an APE pipe on a 787 powered HX, but I soon removed that pipe and installed a FPP Spec2 on that HX.

You are totally jacking yourself off with all of those exhaust systems and all of this testing. 58 mph with twin pipes? I have gotten 60 mph out of a 787 XP with a stock pipe. What a joke !

Quit buying all this junk off of ebay. Buy a Spec2 and go faster and be happy.

bill why your are angry!!!I just want speak this pipe???
60mph stock sea-doo?????your are really sure??? on speedo it's good!!!!
sea-doo xp stock made 56mph on gunradar!!!! 58mph with aftermaket pipe ... gunradar!!!
for your application racing IJSBA (runaboat) it true just 3 system exhaut is good!!!factory specf is the best or but the rest is not all junk !!!look webs sites groupk!!(is not me say)


GROUPK say!!!!!
All the aftermarket pipes we tested worked very well, in one way or another. The common theme among them was they nearly all of them had been developed around high revving limited (race gas) formats, or they yielded their best performance when propped down to allow the higher rpms that normally mandate race gas. We figure that if your going to have to run expensive race gas, use the pipe that yields the highest rpm abilities...that would be the FPP Spec 2 pipe. We will grant that the 7400 - 7500+ rpm's allowed by this Spec2 pipe would mandate periodical bearing maintenance teardowns. However that's no big deal for someone building an all out race motor

[super mecano]

Re: twin pipe psi???

thank bill for all info for this aftermaket pipe!!!!
it's very hot!!!!
!!!
P.S .. PSI IS OUT OF BUSINESS
news is psipower on UTHA!!!

your are encyclopaedia history watercraft!!!:emoticont

[Bill O'Neal2]

Re: twin pipe psi???

Yes all of my speed numbers come from my Stalker Pro radar gun, including a completely stock 1995 XP 800 that belonged to Gary Friez from Micro Touch that ran an honest 58.9 mph the second day he owned it. Most 1995 XP800's run in the 58mph range.
1996 XP's run right at 56 to 56.5 mph ( stalker gun). Some hit 57 mph.

The average " limited class IJSBA race legal" 1995-1998 XP, SPX 787 powered Sea Doo's run in the mid 65 mph bracket, with the fastest ones running around 69 mph on flat salt water. The fastest one I ever saw was a Bo Du Priest built 787 limited that went 69 mph on a salt water canal at sea level in Florida. It went about 67 mph on the race course, as did my own 1996XP. Mine had a Spec2 on it and his had a Neptune pipe on it. One of us usually won the races back then.

So, I'll say it again. You are wasting your time with those sub 60 mph POS pipes that create more detonation than horsepower. I don't care what Harry says. Typically the Rossier pipe will run low 60's if setup correctly. I have seen 64 mph with an APE pipe.
My point is, why go through all of the hassels of making them do it when it is so much easier to use the Spec2, with it's known setups and the reliability it gives ? Are you a glutton for punishment?

[super mecano]

Re: twin pipe psi???

bill you say!!Are you a glutton for punishment

No i not glutton for punishment:emoticonc
I just want divers opinon!!:beer
okay, the xp800 use the cylinder 787X (more agressif,more HP )
i use the cylinder xp1996 in my watercratf 787

because i love work performance snowmobile!!!
I just want why use high compression in watercratf?
because ,john hooper say high compression(c-14-c16)high compression is very hard make record top speed i just more start that hit!!!
high advance timming = more mid-range and not loose top speed!!!

P.S i use the radar gun BUSHNELL (speedster)


look this webs sites. look the clips!!!I love than!!!:emotisun
i never look snowmobile make record with single pipe??
you living in world watercraft and me living world snowmobile,
understands why is if diffenrent between the two world!!:emoticoni
that it!!!
welcome to my world!!!:emoticont look that!!!

http://www.radarruns.com/
http://www.radarruns.com/ (clips)
http://www.fireballcoatings.com/offroad_gallery.html
pro stock snowmobile:emotisun
this last webs link is not MPH ...is it KPH(160 KPH=120MPH and 200KPH =160MPH)
http://www.amerkjetil.com/video/radarmaaling290405.wmv

[javiert99]

Re: twin pipe psi???

Bill, what made the 95's so much quicker?

[super mecano]

Re: twin pipe psi???

Bill, what made the 95's so much quicker?

the waterbox give more backpressure on xp1995 and the cylinder is more porting (exhaust and boots port)more agressif!!!and xp 1995 800 and xp 1996 have impellers 17/25 and xp 97 up and spx 97 up have 16/23

[Bill O'Neal2]

Re: twin pipe psi???

The clyinder porting and the extension of the pump were the main factors in the 95 XP going about 1.5 to 2 mph faster than the 1996 and later models, although all of that is easily surpassed with minor modifications to the later models.

Super Mec,
The 787X clyinder is exactly the same porting as the regular 787, the X meant it was .25 mm oversized bore. It has nothing to do with porting specs.

Yes, snomobiles are faster than watercraft. They live in a different world. When you want to turn a two stroke motor in excess of 8000 rpm, you see the benefits of twin exhaust pipes. A pipe for each clyinder becomes even more critical when you have three clyinders. A snomobile engine has no load at all until the clutch engages, which is at a very high rpm when compared to a watercraft direct drive jetpump. So you need a lower rpm turning motor to produce enough torque to get the watercraft moving and then a jetpump becomes very inefficent at rpm over 7500, so there is no need to spin one much over 8000 rpm and on a two clyinder motor such as the 787, you can accomplish that with a single exhaust pipe, which is much easier to tune and to install into a small area such as an XP hull.

Twin pipes on smaller two stroke engines do not produce alot of low end torque. Low end torque is what makes a watercraft accellerate rapidly and without it, they are not much fun to ride.

[super mecano]

Re: twin pipe psi???

billy, bombardier xp800 1995 made 2 version!! 50 % made engine made by rotax have motor 120HP around!!! and 50% end 1995 xp800 have version news version 110HP (serie xp1996 up)
the first version have cylinder more porting!!I have porting maps engine prior to 1995 and 1996!!(bombardier racing handbook 1998)

the motor 1995 (specf)have little more porting!! look
exhaust port height 35.2mm
exhaust port width 54.4mm
exhaust port height bottom to top 39.3mm
and for rear transfert height 57.3mm and width 21.5 mm
mains transfer height 58.2mm 58.6mm
bottom width of main transfert 28.5mm, 26.5mm
and total height 122.5mm

motor 1996(specf)
exhaust port height 34.6mm
exhaust port width54.4mm
exhaust port height bottom to top 38.4mm and for rear transfert height 56.7mm
and for rear transfert height 56.7mm width 22mm
mains transfer height 56.7mm ,56.7mm
bottom width of main transfert 28.7mm 22.8mm
and total height 122.0mm

:beer thank billy for info !!!I understand why you use single pipe!!with motor modied twins pipe loose torque has lows RPM!!! Is true!! One guy's toronto have test TWIN PIPE PSI on dynotest!!!! 820cc stock motor have 140HP,this guy's no say torque!!!
imagine it must lose torque!!!
billy, you understand why i love twins pipe:emotisun I living this world one pipe each cylinder:emoticont !!!My snowmobile have 8700 RPM (180HP) and my old snowmobile machz 9300rpm(190HP)
thank very much billy for info!!!I am happy:emoticont