Other Will a Power Factor Pipe make power over a bpipe on a 701?

[Yohns Kustom Fabrikation]

Did a little searching and couldnt find anything definitive. My ski is a single carbed 48mm, 185psi, total loss, 701. Looking to bite the bullet on a new pipe soon. Is the power factor going to make anything over the b on my setup? Most of the skis i see with them are alot larger displacement.

 

[fastgtfairlane]

noo the 701 doesnt move enough volume to fill that big of a chamber.. in fact a friend had a square that he got a powerfactor to go with his dasa 1000, but it blew up so he temporarily put a stockish 701 on with that pipe and it was pretty sluggish.. too much pipe for the engine..

 

[Matt_E]

Your friend properly tuned both the carb(s) and the pump to run that pipe of course, right?

 

[NVJAY775]

Like Matt is getting at. They will make more power for sure, just need to set up the whole package properly to get it done. As more guys are running them on smaller cc'd engines, we'll all get better at good set ups. It's nice to be able to have your builder set it all up for you and be done with it though. Also there's some new pipe designs to look at. Can't remember names, but supposedly some sweet designs coming out.

 

[wanderer1]

If you are looking for a dry pipe is there a reason the Riva freeride or Factory Type 4 were'nt considered? Very respectable power and reliability,price is usually a little better than a PF.

 

[Yohns Kustom Fabrikation]

I'm really just trying to buy a pipe that I won't grow out of. I'd be open to other options as well. I've been out of the scene for a few years so if there's something new that's news to me

 

[XJCrawler]

The bpipe goes for so much used, that its not bad upgrading later when you have a bigger motor. Plus you can run a stock tank

 

[stefan]

I have the type 4 pipe and have run a b pipe both 701 38 mm carbs and flame i will take the type 4 it just makes more power when it gets 30+ static timing. Think the PFP does the same.

 

[waxhead]

You guys need to realise that for a bigger engine you have to use a larger stinger pipe. This is to get the heat into the pipe so that it works correctly. A smaller engine will not get the heat up in the pipe.
If you think that one pipe will just work for your engine then your incorrect. The type 9 used to come with adjustable stingers to tune them right. If you really wanted to set your ski up right you would go down and down in stinger size while monitoring egt and cht until you got the right size stinger. This is how you will make the most power from your pipe

 

[NVJAY775]

You guys need to realise that for a bigger engine you have to use a larger stinger pipe. This is to get the heat into the pipe so that it works correctly. A smaller engine will not get the heat up in the pipe.
If you think that one pipe will just work for your engine then your incorrect. The type 9 used to come with adjustable stingers to tune them right. If you really wanted to set your ski up right you would go down and down in stinger size while monitoring egt and cht until you got the right size stinger. This is how you will make the most power from your pipe

Thanks for that info. I just learned something new.

 

[kevbo]

Powerfactor is a short (high rpm) pipe. Small engines struggle to overcome the increasing pump load before the pipe starts working. Making it respond well on small engines will take some tuning skill and race gas.

 

[fastgtfairlane]

Your friend properly tuned both the carb(s) and the pump to run that pipe of course, right?

the carbs were good,the impeller was a tad tall for the engine yes. it was very sluggish off the line once the pipe heated up some it would start to move much better but you had to almost jump the pump out of the water to get the engine to rev and hold it when the pump loaded up again.. either way its technically too big for a stockish 701 in my opinion.. the op has a mild 701 with higher compression, he didnt mention any porting... would you not agree that a b pipe would be a better setup for his boat too??

 

[Matt_E]

Out of curiosity, was it the same pump and impeller as he used for the 1000?

 

[waxhead]

Thats a good point by matt on the prob combination. its not fair to expect the 701 to pull the same prop. The best pipe in my op would be the power factor witht he stinger reduced on it to actually get the pipe to a temp it wants to work at.
Lets try basic pipes 101

Pipes are a tuned length and they have a sonic wave that runs up and down them. The speed they do this is determined by the heat of the pipe.
With a larger engine you have more exhaust gas flow, more heat the same is oppistie for a smaller engine.
To regulate the heat in the pipe you make the stinger larger or smaller, to large and the pipe will not get hot enough to make the power it can , to small and the pipe will get to hot and melt the exhaust side of your pistons. Just right and away you go.
So clearly its not a one pipe fits all combination you have to tune your finial stinger diatmeter to the engine you have.

 

[NVJAY775]

I'm far from a tuner, but mine is hitting hard now 781cc's and I'm liking it a lot more than my FB Limited. But it's taken a lot of effort (trial and errors, help and advice from others) to get it where it is. And I'm changing carbs as soon as they get here, so that should prove to be more fun. But I am really enjoying the learning experience along the way, as I'm a very hands on kind of dude and like feeling the changes and improvements. Soaking up all the knowledge I can along the way fellas!

 

[fastgtfairlane]

Out of curiosity, was it the same pump and impeller as he used for the 1000?[/QUOTE

not that im aware of.. it was last year sometime.. i totally understand where youre going with this.. if it the pump was setup for the dasa, it would load the 701 down so it wouldnt generate enough rpm to heat the pipe up... the powerfactor are really cool pipes.. to recall, he told me about problems with the pipe vibrating loose and it liked to blow o ring gaskets occasionally..

a huge benefit to the b pipes is the availability to swap chambers should you go to a bigger engine..

 

[baxt3r]

If you're talking about Ashby, I'm pretty sure it was the prop for the DASA. We went out and rode for a bit and that thing wouldn't even get my butt out of the water. Saying the pipe makes the 701 sluggish isn't right when there are other aspects of the setup that create handicaps.