OEM 155 Pump Talk

[freestyle 650]

Anybody have a theory for reduction nozzle bore for the 155 pumps? It seems most like their 144 pumps around the 85mm , so with the 155 pump being 10mm larger would that mean 95mm would be the sweet spot, or is I more of a percentage thing, in which case it would be 91.5mm

 

[SpaceCowboy]

Anybody have a theory for reduction nozzle bore for the 155 pumps? It seems most like their 144 pumps around the 85mm , so with the 155 pump being 10mm larger would that mean 95mm would be the sweet spot, or is I more of a percentage thing, in which case it would be 91.5mm

I think that will vary with power plant and impeller pitch. With my 900 motor reduction nozzle seems best at 89mm with a 9/16 impeller pitch but I'm still experimenting.


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[vshockey10]

Oem nozzles can not be bored over 90mm but as mentioned above 89 was what worked well with my 898


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[freestyle 650]

I've got up to 90.5mm max bore on a stock nozzle. Im also considering trying to reinforce the nozzle with glass and carbon and then boring it bigger to see if a larger nozzle combo works better...ex 12/18 prop with 89mm nozzle vs 13/19 prop with 93mm nozzle. I'm curious if anybody has done any testing like this and what their results were

 

[air blair]

Not there yet freestyle 650 but listening to results.


Air blair cell

 

[D-Roc]

I run 90mm reduction with a 9/15 on my 771cc motor.

 

[txsuperjetfreak96]

I run 90mm reduction with a 9/15 on my 771cc motor.

Thats awesome thinking bout making the 155mm pump with my 771 in a v1 aquabot

 

[DAG]

If the center hub could go larger in diameter how big is to big?

 

[alex_hockey]

92mm with 7/14 stock 760 pfp tl 155 14 vein

I first tried at 85mm what a joke motor was way to small ski wouldn't even get on plane open it up to 92mm and you have a back flipping machine. Reduction nozzle sizing is more important than impellor pitch IMHO get close with the impellor and change nozzle size and tail come size to really get your ski running sweet

 

[alex_hockey]

I would of givin up on the 155 at 88mm it sucked

 

[jdmforlife]

The one jm sells is a r&d seal..

 

[kevbo]

If the center hub could go larger in diameter how big is to big?

I have been told that Seadoo is up to an 82mm hub. In theory, you could increase the hub until the impeller outlet area matched the nozzle area which would be around 120mm in a 155 pump . As it is, our 75mm hubs allow double the nozzles area. I am curious how well a 100mm hub would work though.

 

[JT_Freeride]

The one jm sells is a r&d seal..

He also sells the new one.

 

[rubbertoe]

92mm with 7/14 stock 760 pfp tl 155 14 vein

I first tried at 85mm what a joke motor was way to small ski wouldn't even get on plane open it up to 92mm and you have a back flipping machine. Reduction nozzle sizing is more important than impellor pitch IMHO get close with the impellor and change nozzle size and tail come size to really get your ski running sweet

Just curious what nozzle you using that you can bore to 92mm ?

 

[D-Roc]

Hehe yeah Alex. What you got? Mine can only go to 95mm


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[alex_hockey]

Hehe yeah Alex. What you got? Mine can only go to 95mm


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I got mine from my engine builder! He set me straight

 

[rubbertoe]

Just trying absorb all of this info ,but isn't the 90mm working good .maybe you should enlighten us ?

 

[vshockey10]

Skat nozzles


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[alex_hockey]

Just trying absorb all of this info ,but isn't the 90mm working good .maybe you should enlighten us ?

One specific size isnt the "best size" necessarily IMO you need to try different sizes to determine what is best for you. Engine setup/prop/hull/reduction nozzle/intake grate ect. will all change how your pump loads and compresses water and to recieve optimal performance from your pump you need to fine tune this. Skat nozzles are a must on my skis because you are able to change diameter on the fly and preform back to back tests to actually see how a 2mm change will effect your setup. Again this is just what I have found from experience only.

 

[rubbertoe]

Right on ! thanks for the reply Alex . so what i'm hearing sounds as if a different displacements of motor may benefit by unloading the larger pump with diameters larger than 90mm .the only reason i say 90mm is thats about all you can bore a stock exit without it getting dangerously thin .i too found that my 865 had a hard time pushing the larger pump with it at 87mm but i wasn't able to play with larger exit diameter easily ,so i didn't get to test it .this same pump on a larger displacement has no problems pushing it and preforms well with the same 87mm set up .i would be interested with some pics of your skat exit nozzle or how engineered your exit nozzles to be adjustable ? what ski is the adjustable skat exit made for ?