300/440/550 Anyone ever used this pipe?

yamanube

yamanube

This Is The Way
Staff member
Location
Mandalor
I would also assume all those bends and random fittings he has on there to get it to lign up with the waterbox do not help performance.
 
Rickster

Rickster

Matakana Menace
Location
Bay of Plenty, NZ
yamanube said:
I would also assume all those bends and random fittings he has on there to get it to lign up with the waterbox do not help performance.
Click to expand...


Why?

The exhaust gases for my SJ's do a 270 degree turn through the headpipe, a 90 at the waterbox and then 90 again to the front and rear of the ski.:dunno:

I think if you ran that pipe, the routing would be the least of your worries....:frown:
 
kurtwolff

kurtwolff

Location
Mooresville, NC
The performance of that pipe would absolutely suck ass. Last time I checked, dirtbikes did not expel water through their exhaust, ever. Therefore, I would steer clear of that rigged up pipe.
 
jeepmark4x4

jeepmark4x4

Backflip, weeee
Location
Marietta, GA.
water injection aside, It's not going to just bolt up! you have some heavy modding to do. It might not work great, but you only use one cylinder at a time, so maybe if it was like a '350cc' pipe it would work better 700cc/2 cylinders. ALSO you can tune your exhaust to not run with water injection, thats just what most call for.
 
Mile9c1

Mile9c1

X-H2O.com
Location
Grand Rapids, MI
jeepmark4x4 said:
It might not work great, but you only use one cylinder at a time
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Actually you do use both at the same time... and when one is sucking the other is blowing. So I would guess it works like total crap. When skis run dual/triple pipes, they use two chambers like this one!

Also, scientifically speaking, the chances of finding a random rustbucket pipe on Ebay, and it making good power on a ski are slim to none. But you never know... it does look pretty sweet IMO.
 
jeepmark4x4

jeepmark4x4

Backflip, weeee
Location
Marietta, GA.
2 strokes are self explanatory, " when one is sucking the other is blowing." what do you mean by that? In the same stroke the ski lets out exhaust while letting in air to burn, thats why the cylinders are made the way they are. Were talking about exhaust here, Your exhaust is only used one time per fire.
 
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yamanube

yamanube

This Is The Way
Staff member
Location
Mandalor
The exhaust gases for my SJ's do a 270 degree turn through the headpipe, a 90 at the waterbox and then 90 again to the front and rear of the ski.
Click to expand...
Now take those bends (which in exhaust pipe design is aimed at minimizing the amount of bends) and double it. Less bends=less restriction=more power, actually not more power just easier to tune to the correct power band (this is the idea behind the shape) the pipe is not designed for the ski, alot of R&D goes into exhaust design on 2 smokes. If it was a fourstroke, sure just toss a pipe in there, make it a consistant diameter and get it out in the most efficient direction at a calculated length.
 
Mile9c1

Mile9c1

X-H2O.com
Location
Grand Rapids, MI
jeepmark4x4 said:
2 strokes are self explanatory, " when one is sucking the other is blowing." what do you mean by that?
Click to expand...

The exhaust systme on a 2 stroke has to be tuned to return sonic pressure waves to the cylinders at the correct time. When one cylinder is coming up on the compression stroke, the exhaust has to help it fill up with the gasses that escaped while the port is open. So it needs gasses coming back to the engine. However, at the same time, the other cylinder just spewed out it's exhaust gasses so the gasses are going away from the cylinder. Thus one is sucking in and the other is blowing out. If the pipe is not tuned well, the engine will make no power.

So what I was saying is, the chances of a random dirtbike pipe working well is very slim, because it was totally tuned for a different engine.
 
Mile9c1

Mile9c1

X-H2O.com
Location
Grand Rapids, MI
I would bet a million $$$ that's his auction. Well, not really, but it fits so well. I'll ask the seller if it works with his brainless total loss system, then we'll know for sure.
 
djyox

djyox

Old school -not by choice
Location
Twincities, MN
If you look at a tuned pipe, think of it as two cones sitting open end to open end. Just as Mile9c1 was saying, you need both of these cones to make power. The cones help pull out gases and also push back pressure.

I read a very good article/online book (I dunno, I found it online, but now I can't find it) about how the tuned pipe came to be. It came about when they started putting a cone on the end of the pipe on race bikes, it made more power, but would suck the gas out of the cylinder, so they put another cone on that cone to make the pressure bounce back. I'll have to look for that again, it was a very very good read, I found it from an R/C website that was explaining how to make tuned pipes for R/C motors. (same deal just smaller scale)



I also have to agree with Yamanube, those bends arn't helping anything, but then again the water dumping through the pipe isn't either... If you didn't run water though it or around it some how, it would work better I bet, but then you would have to run with out a hood or you would be able to cook a turkey in there along with your hoses and wires...

Yeah I said turkey... you guys know you still want more....












Then again maybe he knows something everyone else doesn't..... and this is the pipe that got that wavejammer up to 450hp...
 
jeepmark4x4

jeepmark4x4

Backflip, weeee
Location
Marietta, GA.
Mile9c1 said:
The exhaust systme on a 2 stroke has to be tuned to return sonic pressure waves to the cylinders at the correct time. When one cylinder is coming up on the compression stroke, the exhaust has to help it fill up with the gasses that escaped while the port is open. So it needs gasses coming back to the engine. However, at the same time, the other cylinder just spewed out it's exhaust gasses so the gasses are going away from the cylinder. Thus one is sucking in and the other is blowing out. If the pipe is not tuned well, the engine will make no power.

So what I was saying is, the chances of a random dirtbike pipe working well is very slim, because it was totally tuned for a different engine.
Click to expand...

I know exactly how 2 stroke pipe works, the motors are very crude in how they operate.... what does this have to do with a dirtbike pipe chamber VS. a jetski pipe chamber? Your arguing with yourself here. I can say it is NOT very slim, working well compared to a 750 dollar factory pipe, yeah it wont work that well. but for 700 dollars cheaper i might make 5 less horsepower or it might work very well..you obviously have not done it so your comparing this to nothing.
 
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WAB

WAB

salty nuts
Location
coastal GA
It would rust like crazy from the inside out. It's not alum or stainless...
You could not run it 'dry', it would melt the rubber hoses.
 
WaveDemon

WaveDemon

Not Dead - Notable Member
Location
Hell, Florida
jeepmark4x4 said:
I know exactly how 2 stroke pipe works, the motors are very crude in how they operate.... what does this have to do with a dirtbike pipe chamber VS. a jetski pipe chamber? Your arguing with yourself here. I can say it is NOT very slim, working well compared to a 750 dollar factory pipe, yeah it wont work that well. but for 700 dollars cheaper i might make 5 less horsepower or it might work very well..you obviously have not done it so your comparing this to nothing.
Click to expand...

put your money where your mouth is. put a dollar down and let us know how it runs.
 
jeepmark4x4

jeepmark4x4

Backflip, weeee
Location
Marietta, GA.
Sounds like a winter project to me...Those 250 pipes arent much smaller than my Cauffman sizzler pipe on my 650sj, the chambers are about the same size, just shapped different. they are almost shaped like a 750sxi factory pipe and those work great. Time time to whip out the 130 amp mig in the garage,

this one is in perfect condition for 25 bucks

http://cgi.ebay.com/ebaymotors/pro-...tegoryZ35596QQihZ006QQitemZ160057603469QQrdZ1
 
yamanube

yamanube

This Is The Way
Staff member
Location
Mandalor
If you do it, cut it up and actually make it fit the ski, use that as a prototype and create something similar to a TNT chamber. If you gonna spend the time do it right and you could end up making some coin. Or people will laugh at you for having a DB pipe in your jetski...
 
djyox

djyox

Old school -not by choice
Location
Twincities, MN
I'm gonna go with option "laugh at you for having a DB pipe in your jetski"


But anyone is welcome to rub it in my face...
 
dbrutherford

dbrutherford

Parts Whore
Location
Fairmont, WV
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