Super Jet Xscream stinger mod on an 865 ?

[CARBONX2]

Reducing the stinger size gets the temp of the pipe up faster, getting it to the peak efficiency range. Run the same mod on a race ski and the heat will buildup too much and burn pistons. You could run a longer pipe with a smaller stinger to make more horsepower at the same rpm, it all has to do with stuffing more mix back into the cylinder.

 

[Idok]

Just to clarify, the stinger mod being discussed is not a generic, make power on any motor mod. It is the mod X-Scream reccomends that be made to a limited chamber to be used specifically with an SS865.

its a mod they use for most ALL their engines....my small bore 785 has it, and so does Cory's

 

[OCD Solutions]

Those are still billet cylinders though. Do they use them with oem cylinders too?

Is the outlet reduced or expanded?

 

[special fx]

I've seen it on stock cylinders and it's reduced from what I've seen. That said, it may a virtual enlargement since it's not being reduced by the spray pattern of the water inlet.....just my $.02

 

[munki63]

Xmetal uses the stinger up to and including the 865SS nothing bigger, purpose of the stinger is to re-route the water... Provides more hit for freestyle...That's all I got today

 

[Idok]

one of those things you have to keep in mind....."its all about the total package" not just a single mod..

 

[JNB421]

I've run a stinger mod on my custom factory pipe on my Mod since 92 and its an OEM cylinder race boat with no burnt pistons.

 

[egbrig]

The stinger acts as a bleeder resistor to keep gas pressure in the pipe. Too much presure and you heat the pistons, too little and you lose power. Its a balancing act to keep the desired gas pressure to work for desired effect. If the stinger is being reduced then the power will increase in the mid to upper rpm ranges. If the gas gets out of the pipe too fast then there is too little medium for the sonic wave to travel through ie; power loss, if the hot gases don't get out fast enough then it will transfer the heat to the pistons and you'll get a cooked piston. How the water is injected into the stinger can have effect also. There is no one setup that meets all. To get the best for each engine package you'ld have to test for each setup but there are good general starting points. When Factory Pipe built their pipes they built them with an average setup so many different engine builds could run the pipe with blowing the things up. You should see JNB421's stinger on his mod pipe, it would blow most engine builders minds.

 

[harrypotter]

Try it and tell us how it works, i was going to run my carbon mod chamber with mine but was told it was not ideal for the motor. You can always upgrade later. Shipping across the pond isn't too bad or I'm sure Chris at ATP would be more than happy to mod you up a limited chamber.

Loki customs is the uk xscream /xmetal dealer he has all the specs for this mod . Just wanted some first hand feedback really . If I make it to daytona this year is that offer of a ride on your ski still there ? One or2 others have been kind enough to offer as it's a bit far to trailer mine lol

 

[2XLR8]

The amount of water being injected at the stinger does increase the back pressure in the pipe not just by spraying it in the stinger but by increasing the amount of water going into the water box. More water = more back pressure. No one has mentioned the back pressure in the water box and how it affects the back pressure in the pipe. The two are very closely related.
I think someone needs to mention the stinger diameter on the power factor pipe just to keep things interesting.

 

[Polish jet pilot]

I guess if you run oem w/b and a larger cc engine you should do the stinger mod. If you run an a/m w/b then the mod is not necessary (oem to about 780cc?)...??

 

[munki63]

I guess if you run oem w/b and a larger cc engine you should do the stinger mod. If you run an a/m w/b then the mod is not necessary (oem to about 780cc?)...??

We I spoke to X-metal they said I provides a small gain on all set-ups 865ss or smaller

 

[shawn_NJ]

I have a limited chamber with the stinger mod on my XS771 oem cylinder motor, as it was recommended by XS when I ordered. Hits VERY good for just a big bore.

 

[Breese08SJ]

Can anyone give any dimensions on the powerfactor stinger diameter? How does it compared to the b-pipe stinger outlet? Maybe I'm the only one who is wondering what 2XLR8 is trying to get at?

The amount of water being injected at the stinger does increase the back pressure in the pipe not just by spraying it in the stinger but by increasing the amount of water going into the water box. More water = more back pressure. No one has mentioned the back pressure in the water box and how it affects the back pressure in the pipe. The two are very closely related.
I think someone needs to mention the stinger diameter on the power factor pipe just to keep things interesting.

 

[Matt_E]

I suspect it's smaller than the outlet of the B-Pipe chambers. (But I don't know)

 

[ATS_Aaron]

The Power Factor pipe has a inner and outer pipe at the stinger just like shown on page 1. The ID of the inside pipe is only 42mm. The ID of the outside pipe is 48mm. I used some pretty crappy calipers so I could be off by 1 mm.

I don't understand the fascination with the B-pipe. I was designed for a 633cc engine and tweaked from there, people are expecting decent results on 1000cc engines?

Aaron

 

[BruceSki]

The Power Factor pipe has a inner and outer pipe at the stinger just like shown on page 1. The ID of the inside pipe is only 42mm. The ID of the outside pipe is 48mm. I used some pretty crappy calipers so I could be off by 1 mm.

I don't understand the fascination with the B-pipe. I was designed for a 633cc engine and tweaked from there, people are expecting decent results on 1000cc engines?

Aaron

The fascination is it fits in the hull nicely and is easy to install/remove for most people. A larger expansion chamber makes this more difficult.

 

[WaveDemon]

The fascination is it fits in the hull nicely and is easy to install/remove for most people. A larger expansion chamber makes this more difficult.

and they don't let water backflow into the motor.

 

[2XLR8]

When I saw a powerfactor pipe the stinger visually looked smaller yet people are using them on engines near one liter in size. You see guys thinking about getting a stinger mod on their smaller engines that actually enlarges the stinger. Maybe their going to come out with a mod for those powerfactor pipes as well, as long as customers are willing to pay for it.
I think the powerfactor pipe works good on some engines and not as good on others because I have seen people say they went back to the b pipe because the troubles were not worth it. I think it is the way the engine is built.

 

[Freakrider]

I don't believe that the stinger mod increases the outlet diameter but rather adds a water jacket sleeve around the entire length of the stinger to divert water from entering the stinger. The water flows directly into the water box hose which is larger.