OEM 155 Pump Talk

[alex_hockey]

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 ?

The 865 may of had a hard time but if you were to open up the reduction nozzle I believe it would act the same as lessing the pitch of the impellor. My engine was really struggling at 85mm and increasingly got better as the nozzle was opened up. My nozzle is a frankenstein for the 155 pump but skat or blowsion makes these.

Something like this

https://www.blowsion.com/blowsion-tilt-trim-system-yamaha

http://www.skat-trak.com/watercraft.html

 

[AdzUK]

Whats the biggest you would safely open a GP1200 exit nozzle up too? This is my GP1200 one below..

And what stock nozzles are you using to get bigger than the GP1200?

Thanks, Adz.

 

[vshockey10]

Adz

89 - 89.5 mm


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[AdzUK]

Thanks vshocky10, bigger than i thought it would go. Will get it bored to 89mm and give that a try.

 

[vshockey10]

Do it yourself. Just need a sanding drum, a drill and some wd40.

Takes 5 mins

http://www.menards.com/main/tools-h...ories/abrasives/drum-sander-1x1/p-1460952.htm


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[OCD Solutions]

Do it yourself. Just need a sanding drum, a drill, a couple beer and some wd40.

Takes 5 mins and 2 beer.

http://www.menards.com/main/tools-h...ories/abrasives/drum-sander-1x1/p-1460952.htm


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Fixed it for ya.

 

[Nate_D]

Wouldn't a flapper wheel be better? I'm thinking about vac bagging some carbon over my stock nozzle and taking it out beyond 89. If I get around to it I will post some pictures and the results. I am going to be running an 896 non PV 4mm and 155 mag. Not sure where to be on the prop/reduction nozzle though.


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[kevbo]

Wouldn't a flapper wheel be better? I'm thinking about vac bagging some carbon over my stock nozzle and taking it out beyond 89. If I get around to it I will post some pictures and the results. I am going to be running an 896 non PV 4mm and 155 mag. Not sure where to be on the prop/reduction nozzle though.


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Use fiberglass if you can, carbon will eat up the aluminum.

 

[Nate_D]

I would use a boundary layer of glass to combat the galvanic corrosion. I usually anodize aluminum that is used in the layup as well, but that's all 6061 not cast.


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[vshockey10]

Nate_D think you could make a composite 155 reduction nozzle with interchangeable ring sizes. I've been following your hull thread from a distance you have some amazing skill!


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[txsuperjetfreak96]

Yeah that would b awesome

 

[Nate_D]

Thanks! And yes. I was actually thinking about how I would mold that shape today. The mounting tabs would probably need to be molded separately and bonded post cure, but the cone itself has a geometry that would allow it to be made in one piece with a single mold. Albeit a very deep mold. I would need to get someone to turn out different size rings for it. I might take this project on after I get all of the molds for this hull wrapped up.


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[D-Roc]

There is a market for it as more people clue into the need for this part. Do it before the market gets flooded with them.


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[kevbo]

It is amazing how long it takes some things to catch on.

 

[D-Roc]

I remember seeing a 155 pump shoe for a superjet made by water dawg customs years ago and thought hmmmmm I gotta try that.


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[air blair]

I could use a few 7/12 or smaller or props.

ghetto job bolting together but it'll work.


Air blair cell

 

[freestyle 650]

Testing is going well...up to 95mm nozzle bore

 

[Nate_D]

Very cool! Do you do all of your machining in house or outsource it? Buying and learning to use a lathe and mini mill is on my list of things to do.


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[freestyle 650]

Very cool! Do you do all of your machining in house or outsource it? Buying and learning to use a lathe and mini mill is on my list of things to do.

At my day job I am an aerospace machinist and am able to do stuff like this when time permits


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[freestyle 650]

Tested the 95mm nozzle with 96mm steer nozzle this wknd and it's working good, I think it's right near the limit of maxing out with my current prop 10/16. I'll take it to 96 and see what happens, if it's too big I'll tweak the prop pitch so I can keep going up with the nozzle bore.