Super Jet could be a stupid qustion, but what the hell.

McDog

Other Administrator
Staff member
Location
South Florida
For as long as the 701 has been out and with racing having the rules it does about allowed engine mods, I would think every combo has been tried by very knowledgable people in the past to squeeze power out of a 701. That being said, I have no technical knowledge one way or the other so don't listen to me.
 

#ZERO

Beach Bum
Location
Florida - U.S.A.
I don't believe you would be able to develop any power with a PF exhaust manifold coupled to a b-limited chamber because you would be missing the header/diffuser section that's built into the PF chamber. This is usually 7 to 10-degree angle that's built into the b-pipes head pipe section that you would be eliminating.
 

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
why wouldnt you just run a dry pipe... after all thats the same a powerfactor just vertical instead of horizontal....

The vertical drypipes still have a 180 degree bend from manifold to chamber.
The pf doesn't have that.
 
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steve-uk

Manners cost nothing
Location
Barrie - ontario
both have similar manifold and have the bend in the chamber from what i can see.... factory goes vertical, power factor horizontal

difference? maybe $700 and a litre of koolaid?
 

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waxhead

wannabe backflipper
Location
gold coast
The power factor runs the old style type 8 manifold, there is no power loss by the bend in the pipe. the pipe is so big where it turns its not an actual restriction.
 
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Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
both have similar manifold and have the bend in the chamber from what i can see.... factory goes vertical, power factor horizontal

difference? maybe $700 and a litre of koolaid?

Are you not seeing the additional 180 bend on the vertical pipe that the pf doesn't have? :confused:
 

steve-uk

Manners cost nothing
Location
Barrie - ontario
seems that Factory dry pipes got a bad rap on this forum cos an some alpha posters said the b-pipe was better...

now some alpha posters got deals from power factor (aka dry pipe) and they are the best thing since slide bread...
 

waxhead

wannabe backflipper
Location
gold coast
The factory dry pipe makes more power, however it doenst have the same throttle response. The dry pipes have more power every where you grab the throttle and hang on. however if you want to just play the throttle on the waves ie small throttle inputs its not as good.
 

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
Dont get to stressed about the 180 bend if the flow was an issue then we would be running big stingers.

Hey, I'm not saying it's a big deal (or that it's not).
Just pointing out that if someone is worried about the tight bend on a B-pipe vs a PF, then a standard drypipe isn't much of an improvement.
 
seems that Factory dry pipes got a bad rap on this forum cos an some alpha posters said the b-pipe was better...

now some alpha posters got deals from power factor (aka dry pipe) and they are the best thing since slide bread...



not saying that isnt some truth to that statement......but


one of the biggest propents to the B pipe that will be forever true is that they are EASY


if somone has repeated coupler failure on a FPP B.....it aint the pipe, its the install/components




with a B you set it and forget it...but every boat with a dry Ive ever ridden definatly had looots of power in all ranges
 

waxhead

wannabe backflipper
Location
gold coast
Ahh ok
I think the limiting factor for a b-pipe is that it was not designed for engines as big as we are doing these days and so the header and the divergent cone are taken out side there spec. Also they join the cylinders together alot sooner than a dry pipe. Anytime a single pipe is used on a twin cylinder over 180 degrees exhaust its a huge comprimise due to both exhaust ports being open at the same time. The fact that the runners on the flat draft manifold are may help this
 

yamanube

This Is The Way
Staff member
Location
Mandalor
Water can pretty easily back flow into the cylinders with that manifold design, having a wetpipe exaggerates this issue. I had to be very careful with the angle of my ski with my WDK wetpipe to not injest water while the ski was not running.
 
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