FX-1 another 144mm question

MNTURBO

MNTURBO

Location
Minneapolis, MN
so I just bought an fx-1 with the 144mm pump, and stock pump shoe from a guy on the X...

how hard is it to pull out the 122mm stock shoe and put in a 144 metal blowsion piece? I'm a quick learner but have very little fiberglassing and grinding experience

if there are any threads I could be forwarded to, that would be great too

thanks
 
butti

butti

lone wolf
Location
F-XTC
on my fx i removed the stock pump shoe and filled it with tooling epoxy from the backside so that it becomes a solid part.Then you can open it up to 144mm and epoxy it back into the hull.the reason i did mine this way is so that no other parts have to be modified.
 
yamanube

yamanube

This Is The Way
Staff member
Location
Mandalor
butti said:
on my fx i removed the stock pump shoe and filled it with tooling epoxy from the backside so that it becomes a solid part.Then you can open it up to 144mm and epoxy it back into the hull.the reason i did mine this way is so that no other parts have to be modified.
Click to expand...
This was what I was thinking about doing also, Ben and I had talked about this. If you are planning on swapping it there really is no reason not to try this before buying a superjet shoe.
 
MNTURBO

MNTURBO

Location
Minneapolis, MN
ohh thats right, I guess I thought the stock shoe would only widen to 130mm, but that must be without the epoxy

btw jason, I trailered it to the lake twice today... I LOVE this ski
 
yamanube

yamanube

This Is The Way
Staff member
Location
Mandalor
MNTURBO said:
ohh thats right, I guess I thought the stock shoe would only widen to 130mm, but that must be without the epoxy

btw jason, I trailered it to the lake twice today... I LOVE this ski
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Good deal man, let me know when you get the pump shoe figured out and dialed in, I want to see how big of a difference it makes.
 
G

Goosalandi29

Location
Coal City, IL
let me know too

I just got an FX-1 as well and I am doing a pump conversion this winter and figured I would go ahead and mod the hole thing at once so let me know what you end up doing too:shrug: cuz im not sure how to go at this yet
 
Shadow7874

Shadow7874

Location
Ocala, FL
FX-Rex said:
take it to a machine shop.
Click to expand...

Hmmm, didnt think of that.

So bore out the fx pump, one end of the pump bolts right up, the other i have to grind down and bolt in and make the ride plate fit? surely its not that easy, i have read alot of conversion threads but it seems easy the way im thinking of it. What shaft fits?

Also, do i really need to open up the intake cavity or will the fx1 size intake with a top loader be just as good?
 
kkosche

kkosche

Location
Lake Stevens, WA
For those out there who have done the 144 pump conversation w/o shoe conversion, then gone back and done the shoe conversion, how much difference did it make?

I just did the 144 pump, stock motor, JD Intake, Running a Hooker 10/16 -7m. It really hooks. . . can't imagine the entire shoe gig is worth the marginal gain . . . but could be wrong. I now need to make a bit more power but hence the upgrade cycle.
 
just joe

just joe

Site Supporter
Location
NorCal
Another good reason to modify the stock shoe is that the fit-up back to the hull will be spot on. I had an involved time cutting Blowsion's 144mm shoe to fit, then getting it perfectly perpendicular. I have pics in the gallery of the installation of the 144mm shoe in the FX1 hull.

I also set the shoe and pump into the hull such that the shoe didn't extend significantly below the bottom surface. This meant filling with epoxy and glass from the tray for reinforcement around the shoe area due to grinding required. I like the ski to be loose.

I opened up the intake area in width, to keep 144mm to the pump, but I kept the FX1 intake length and FX1 size grate. Minimum diameter through the pump is the limiting factor. If shoe is at 125mm or intake diameter is 130mm, you aren't getting the max benefit from the pump. You will create a low pressure area in the pump immediately behind the shoe and on the outer edges of the prop, and a high velocity area toward the center, cutting it's effectiveness (and increasing tendency to cavitate). How noticeable this effect this has I can't tell you, it depends on many variables. I'm just going by the physics of uncompressible fluids.
 

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MNTURBO

MNTURBO

Location
Minneapolis, MN
just joe said:
Another good reason to modify the stock shoe is that the fit-up back to the hull will be spot on. I had an involved time cutting Blowsion's 144mm shoe to fit, then getting it perfectly perpendicular. I have pics in the gallery of the installation of the 144mm shoe in the FX1 hull.

I also set the shoe and pump into the hull such that the shoe didn't extend significantly below the bottom surface. This meant filling with epoxy and glass from the tray for reinforcement around the shoe area due to grinding required. I like the ski to be loose.

I opened up the intake area in width, to keep 144mm to the pump, but I kept the FX1 intake length and FX1 size grate. Minimum diameter through the pump is the limiting factor. If shoe is at 125mm or intake diameter is 130mm, you aren't getting the max benefit from the pump. You will create a low pressure area in the pump immediately behind the shoe and on the outer edges of the prop, and a high velocity area toward the center, cutting it's effectiveness (and increasing tendency to cavitate). How noticeable this effect this has I can't tell you, it depends on many variables. I'm just going by the physics of uncompressible fluids.
Click to expand...


It looks good, my ski hooks up really well with the 122mm shoe and 144mm pump, so my thought process is to bore out the shoe to eliminate the pump noise I get right now, and hopefully gain even more hook up and response.

I plan to leave the actual intake as it is, however, because fiberglassing and hydrodynamics are beyond my knowledge....and I can't imagine seeing much more of an improvement for all the work
 
yamanube

yamanube

This Is The Way
Staff member
Location
Mandalor
I doubt the smaller intake tract will really effect it much, back in the day everybody was putting in pump stuffers on the superjets to create a smaller intact tract and they worked well, IMO it is not worth the time to open up the hull, just match the pump shoe to the pump and rock it.
 
just joe

just joe

Site Supporter
Location
NorCal
MNTURBO said:
It looks good, my ski hooks up really well with the 122mm shoe and 144mm pump, so my thought process is to bore out the shoe to eliminate the pump noise I get right now, and hopefully gain even more hook up and response.

I plan to leave the actual intake as it is, however, because fiberglassing and hydrodynamics are beyond my knowledge....and I can't imagine seeing much more of an improvement for all the work
Click to expand...

I don't blame you, it is a lot of work and I agree it may not make a huge difference. I like doing the work, so it made sense for me.
 
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