Driveshaft carnage

[skiscumm]

samething happen to my superjet i had a 8 mil stroker motor running full throttle on 2 foot cop

 

[Motorheads5]

Because the guy that I paid money to build me a nice setup recommends a 140 mag for that setup.

That's interesting I am curious to know more about mag pump's for sure. Not that I have the worry of ever being capable of needing one lol.

 

[Matt_E]

I'll give a full report once I have it all together.
I am probably a few weeks out.

 

[IceRocket1286]

That happened on my squarenose a few years ago, as far away from my cottage as it could happen. Luckily I had a rope and my brother with his ski.

A 140 mag will be perfect for you, what a great excuse for you to buy one haha.

 

[Matt_E]

what a great excuse for you to buy one haha.

I needed a new shaft. :dunno: :biggrin:

 

[Motorheads5]

What size pump is in the fx-1 ? just curious because of the whole fx-1 saga of pump conversion's being needed ect. That being said it kind of surprises me that you would go smaller than stock, there again I do not know much about mag pump's either. I know you are getting worthey advice it is interesting though I am missing the concept obviousley. You got a nice motor setup for sure.

 

[Matt_E]

Stock FX1 size is 122mm.

About going from 144 stock to 140 mag - the mag pump is said to work a lot more efficiently, with more hookup and all. Therefore, it can work better smaller than the larger, less efficient stock pump.

 

[Motorheads5]

Stock FX1 size is 122mm.

About going from 144 stock to 140 mag - the mag pump is said to work a lot more efficiently, with more hookup and all. Therefore, it can work better smaller than the larger, less efficient stock pump.

Ok That makes sense. I was looking at some pic's of the skat mag pump and it look's like the bearing housing is alot smaller than a stock SJ pump and also has alot thinner vein's. So would it be fair to say that the cubic millimeter's of a stock 144MM sj pump would be the same as a 140MM Mag ??

 

[Matt_E]

No, I don't think so at all.
The hub (bearing housing) is a larger diameter in all magnum pumps than a stock pump.
There is less cross-sectional area available for water in even the 144 mag pump. They work with higher pressure instead of more volume. (the 140 and 144, anyways)

 

[Motorheads5]

Damm ok well reconfirming my confusion lol

 

[227]

I have a mag pump and it’s the shiz. Mag pumps work well because the bearing housing is larger than a stock pump so they require less water to keep the pump loaded. They work exceptionally well in the surf and are most noticeable when your in the churned up whitewater. Mows through whitewater like its not even there. Whenever I pull the mag pump for maintainence and go back to stock I feel like I’m in neutral half the time.

 

[Matt_E]

Hookup is what I am after. My short hull and decent power out of my motor has my pump unhooked quite a bit, especially in the corners and coming out of the hole.

 

[Odd Duck]

Stock FX1 size is 122mm.

About going from 144 stock to 140 mag - the mag pump is said to work a lot more efficiently, with more hookup and all. Therefore, it can work better smaller than the larger, less efficient stock pump.

And not to forget that the 122mm pump is also a less efficient design, so the FX1 has a double whammy against it. If it was JUST a 122mm pump with a more efficient, modern design, it might not be quite the bane of that ski that it is when stock.

Sorry for the thread hijack, back to your normally scheduled topic.