how goods is a b pipe

[yamking800]

hi new to this site can any on tell me if i put a b pipe on my 2009 super jet how will it go and i have heard that the barrells will split :twak:is this true

 

[Matt_E]

Barrels = cylinders? :dunno:

Superjet cylinders do have that problem. Many people alleviate it by using an aftermarket girdled head.

 

[sflsurfrider]

they tend to crack after being ported if you dont run a girdled head. ive seen unported cylinders crack too, though.

 

[brett]

its the best pipe on the market. get one if ya could

 

[DC SUPERJET]

i just finished installing mine and rode it for the first time this past weekend and it is a big difference. My motor is all stock except for the limited b-pipe and it was worth every penny. Huge low and mid range increase in power.

 

[Idok]

they tend to crack after being ported if you dont run a girdled head. ive seen unported cylinders crack too, though.

i dont think it makes a difference if its ported or not....


I have had 3 crack and they were all stock cyls......no griddle head ancake:

 

[DC SUPERJET]

i dont think it makes a difference if its ported or not....


I have had 3 crack and they were all stock cyls......no griddle head ancake:

do they crack because of the b-pipe or for some other reason?

 

[brett]

do they crack because of the b-pipe or for some other reason?

the pipe...buy a girdle kit... i think groupk has them if you dont want to run an a/m head

 

[Midlake Crisis]

I think the jury is still out on girdled heads.
This is from the GroupK site:

Cylinder Casting Fracturing - The 701cc cylinder castings can, and sometimes do, develop fractures in the area around the cylinder base bolts. There is some disagreement among engine builders about the true reasons behind (and potential solutions for) this fracturing. Originally it was believed that this fracturing was an exclusive result of the high horsepower output of modified racing engines. However this fracturing has appeared on many completely stock machines. It was then believed (by many engine builders) that the complete solution to avoid cylinder fracturing is to us a "girdle" type cylinder head. This term "girdling" refers to an aftermarket head (or bracketing plates) that allow the cylinder to be "captured" between the cylinder head and the crankcases. The theoretical intent of this "girdle" type mounting is to reduce the loads on the lower part of the cylinder casting, thus reducing the stresses that cause the fracturing. While it seems reasonable that this girdle type mounting may certainly help matters, we have seen plenty of girdle mounted cylinders develop fractures. Along that same line, we have also seen many big bore top ends, without girdle mounting, last several seasons without developing any fractures at all.
Our experience and observations incline us to believe that there are variations in the integrity of the individual castings. These variations result in some production parts that have a higher risk of fracturing than others (regardless of power output or mounting system). Unfortunately, no kind of x-ray or inspection process has yet been able to determine which cylinder castings may be at higher risk than others.
With all that said, we can make two recommendations. First, choose as new a cylinder as possible for your race machine (particularly if you are building a big bore). The second would be to use the R&D head with interchangeable domes, and girdle mounting kit, for any race gas engine modification set. While this head is intended to be used with no head gasket, we set up our Limited 2 kits to use it along with a .010" stainless steel head gasket, to improve long term sealing. Note that if this R&D head is chosen for an 85mm+ bore diameter arrangement, it must be special ordered direct from R&D.

 

[wrxman60]

so what exactly does a girdled head look like?

 

[brett]

so what exactly does a girdled head look like?

the outside head bolts go all the way down intoo the cases

 

[DAG]

Have you looked into A-Pipes?

 

[DC SUPERJET]

the pipe...buy a girdle kit... i think groupk has them if you dont want to run an a/m head

that's fine with me, I planned on buying a girdled head soon anyways, now I just have more motivation to buy one even sooner

 

[wrxman60]

Thanks for the pics man, thats what I thought they looked like

the outside head bolts go all the way down intoo the cases

 

[yamking800]

pipe

so if i buy the b pipe i should buy a new head and it will help :thinking:

 

[Lucaumpits]

you will be fine with out the head
but if you buy will be huge help

so if i buy the b pipe i should buy a new head and it will help :thinking:

 

[gofast476]

Personally, I would agree with group K's assesment. The B-pipe weighs less than a stock pipe and as long as your motor is properly aligned, I would see no risk of excessive vibration, and thus, I would see no inreased risk by running a b-pipe over running a stock pipe. The girdled head should definitely give your motor more security, but nothing is guaranteed when it comes to jet skis. Bottom line is, take time and make sure your ski si put together right; if anything goes wrong from there, there probably isn't much you could have done in the first place; sometimes sh*t happens.

 

[Polish jet pilot]

Personally, I would agree with group K's assesment. The B-pipe weighs less than a stock pipe and as long as your motor is properly aligned, I would see no risk of excessive vibration, and thus, I would see no inreased risk by running a b-pipe over running a stock pipe. The girdled head should definitely give your motor more security, but nothing is guaranteed when it comes to jet skis. Bottom line is, take time and make sure your ski si put together right; if anything goes wrong from there, there probably isn't much you could have done in the first place; sometimes sh*t happens.

finally words of truth...

 

[curt248]

Anybody know the hp gains with the different types of b pipe (limited, dry)?

How about the HP curve, where do the gains come in? Where does it lose power over stock?

 

[brett]

never loses power compared to stock...stock is utter crap

dry is more hp but on the top end... b is low to mid power