Hull modding question

Shadow7874

Shadow7874

Location
Ocala, FL
Ive read through the posts in the fx1 section and ive had an idea but im not sure how well it would work. I was going to try and make a mold of a SJ pump/intake area and trim it as well as the fx1 hull to where i could just glass the intake and pump in and then reinforce the thing and be done. Im a making this sound way to easy or does it seem pretty reasonable?

If its a good idea would someone be able to make a mold of a SJ? ive never had a chance to look at one, just my fx1, so if i could get a hold of a mold of pretty much the rear lower half of the hull i might be able to envision what im thinking.
 
Shadow7874

Shadow7874

Location
Ocala, FL
Foximus said:
I did this with my 550. Check out my thread. Pretty much outlines what your going to do.


http://www.x-h2o.com/threads/47078


Good luck.
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Ive read your thread before but completely forgot about it. Thanks!
Thats about exactly what im planning on doing but with a sj and fx1 instead of 550 and 650.

One thing im unsure of is the drive shaft i would have to use. Do you guys think i can line it up right to use the fx1 shaft or would i need a different setup? And does anyone know how the dimensions of the SJ compare to the fx1 as far as pump housing and intake?
 
Liquid Graffix

Liquid Graffix

liquidgraffix
Location
In the shop or on the water
SJ pump is 144mm and the FX-1 is 138mm. There is a link in the TECH section that will take you to a company that sells driveshafts and gives all of the specs as far as lengths and such. What you are planning on doing is a BIG project, but definitely go for it! Make sure you post a build thread. Good luck!
 
Shadow7874

Shadow7874

Location
Ocala, FL
stunts318 said:
SJ pump is 144mm and the FX-1 is 138mm. There is a link in the TECH section that will take you to a company that sells driveshafts and gives all of the specs as far as lengths and such. What you are planning on doing is a BIG project, but definitely go for it! Make sure you post a build thread. Good luck!
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Im in the process of finding a cheap fx1 hull to work with. Once i get that i gotta figure out how to get a sj hull or at least find someone to make a mold of their intake and pump housing to sell to me.
 
Foximus

Foximus

CFL Cheapass.
Location
Oviedo, Fl
Why dont you just go the easy way with a kawi 140 pump?


Having already gone through what your planning to do myself, I would highly advise it.
 
Foximus

Foximus

CFL Cheapass.
Location
Oviedo, Fl
stunts318 said:
or.... find a SN that someone is getting rid of for free or cheap and cut the section out of it. The SN and RN bottom decks are the same.
Click to expand...



But there is a HUGE difference betwixt the chine dimensions of the SJ hull vs fx1. He will have lots of reshaping to do.
 
Shadow7874

Shadow7874

Location
Ocala, FL
how much easier would the 140 be? I was thinking if i ground the sj down to just the intake and pump i wouldnt have to worry about the chines very much
 
Foximus

Foximus

CFL Cheapass.
Location
Oviedo, Fl
Uh... compared to what your talking about, the 140 pump is Almost Bolt on....

LoL.


As for the chines matching, You need to also match the bottom flat of the hull, as well as the chine depth. At some poitn you are going to have to match the driveline angles and the hull needs to be at a place where it can meet. Especially since your not planning on moving the bulkhead. Then theres the issue of actually finding a shaft that will be the correct length since you are working with a midshaft, and not a 1 piece kawi shaft.


If you dont get your pump kavity angle just right, you will always be cursed with stripping your splines since you have a yama midshaft. With a kawi driveshaft theres a bit more room for error.
 
kevbo

kevbo

Location
dfw
I think taking a mold off a SJ would be double work for a single mod and even then it may not fit under an FX1 tray. Installing a 144 correctly is a lot of work and worth only a little low speed thrust over a proper Kawi conversion. The easiest/best pump mod would be to use a 750 pump and make a Yamaha shaped shoe, its better than a Kawi shoe at low speeds. From there get an sxr or sxipro grate and lengthen the inlet to match. This is required to keep the pump fed at low speeds. I have been working with my neighbors "bolt in" 144 conversion and getting it to work right has been a lot more work than any of us bargained for.
 
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