D-Roc
I forgot!
- Location
- Dirty River Rider
Not angry either. Just talking.
155 mm pump tune sugestions
- Thread starter rubbertoe
- Start date
D-Roc
I forgot!
- Location
- Dirty River Rider
Looking more at those two pump pictures, the oem veins are fat and long. I wonder what those 6 veins volume is compared to the 12 shorter thin mag veins.
D-Roc
I forgot!
- Location
- Dirty River Rider
So to further the discussion.
When we install a mag pump in place of our oem pump, can we expect a load increase on our motor if we use the same prop pitch and reduction nozzle size? Yes. This is because of the volume change that the larger hub makes. The prop has less volume to push the water thru. This can be adjusted by the exit diameter or yes a lower pitch prop (eeewww) I did notice an increase in load on my 144 when I added a TBM. It is my believe that the load increase from using a mag pump is mostly that from the hub size not the amount of veins. And the reasons a 12 vein 144 works better than a TBM 6 vein is because the additional veins increase the flow efficiency which was offset by the bigger hub. Whoa I blew my own mind on that one. Lol
When we install a mag pump in place of our oem pump, can we expect a load increase on our motor if we use the same prop pitch and reduction nozzle size? Yes. This is because of the volume change that the larger hub makes. The prop has less volume to push the water thru. This can be adjusted by the exit diameter or yes a lower pitch prop (eeewww) I did notice an increase in load on my 144 when I added a TBM. It is my believe that the load increase from using a mag pump is mostly that from the hub size not the amount of veins. And the reasons a 12 vein 144 works better than a TBM 6 vein is because the additional veins increase the flow efficiency which was offset by the bigger hub. Whoa I blew my own mind on that one. Lol
a 144 stock compared to a mag wouldn't be a huge load difference . but a 144 to a 155 ..well
D-Roc
I forgot!
- Location
- Dirty River Rider
A144 to 155 is a big diameter change but does not have to load your engine more if you can adj internal pump volume and reduction nozzle size. I didn't adj jetting timing or pipe settings when I did my swap.
Aquaholic
World's Oldest Teenager
- Location
- San Diego, CA.
Blah, Blah, Blah, Friggin' Blah. HOLYSHEEET, SmellyToe.....why are you sitting at your 'puter discussing a bunch of meaningless BS, when you could have been out with us, actually playing on the water.
Turn in your ECFR paraphenalia immedietly.
- Location
- the jetski grave yard
behind the prop, in the cavities between veins, there is turbulence. the more veins, the tighter those cavities are and less turbulence can be created in those tighter areas. thats why just putting a pump stuffer in a stock pump increases pump efficiency, buy reducing the size of those cavities , where turbulence is created and its basically just wasted space. a prop only pushes so much water and not enough water for those large spaces, so larger hub pumps reduce wasted space and increase pump pressure. its like having a huge crowd of people in a room and having only 6 doors for them to go out as opposed to 12 or 14 doors. its going to be a lot smoother process with 14 doors.
D-Roc
I forgot!
- Location
- Dirty River Rider
I can agree with that theory.
Why ride when ya'll can surf?
Why ride when ya'll can surf?
Really had kind of a nice peaceful day ,planted some fruit trees and discussed pump theories with buds online .you know the kind of stuff you get to do on an everyday basis.meanwhile i'm out working like an alpaca in the Ande's mountains. really if you know me i could give two craps about the overall quantum physics of pump functions nor am I trying to start a debate , buzzard summed it up the basic dynamics anyway (thank yo ) i just like to interact sometimes . what i do care about is that my pump is able to fling me out of the water like a big ninja and the 155 fits the bill (karate chop)
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Went braaapppping on Sunday all felt good . Also got a pm from Christian83 and seems we are all fairly close in set up (his being a 7/13 in an oem pump ) wich brings me to my next topic of discussion that d-roc brought to light (thank you for your input ) my exit nozzle is 89 mm and came off a waveblaster2 , I think Christian is running one off a gp 1200 not sure of its size ? It would be cool to have like a data base type of thread of the different exit nozzle sizes avalable that would fit a 155 mm or 144 and what model ski they came off so you could find tune options easily . Just a thought .
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- Location
- amarillo ,tx
We should start one there's one for carbs.
D-Roc
I forgot!
- Location
- Dirty River Rider
The taller the pitch and smaller the motor = bigger reduction nozzle diameter. I had 2 different reduction nozzles both needed to be bored but I think 88mm was as big as I dared to go. That's why I bought the skat reduction nozzle for a gp1300 with a few rings. It can go as big as 95mm without any rings.
D-Roc
I forgot!
- Location
- Dirty River Rider
Your wb2 @ 89mm was it bored out or is that stock diameter?
D-Roc
I forgot!
- Location
- Dirty River Rider
Or maybe a larger tail cone? Your running a stubby cone now correct?
- Location
- Hamilton,
my 760 with 7/14 impellor and a s/b 155 14 vein medium cone would not even move with a 86/87mm reduction, bump that up to 93 and we have amazing power. Tuning your pump is critical, luckly droc is my local hydrodynamics guru.
- Location
- Hamilton,
gp1300r skat nozzle with adjustable reduction and steering rings, ive had best results running steering slightly larger (2mm) steering nozzle , rubber flow guard is a must, i blew mine apart and noticed a huge difference