Freestyle Feedback on Mag impellers in OEM pumps

[D-Roc]

Well each prop is $300, so try 3 different ones and spend another 900 or talk to someone who knows there stuff and pay one time and get it right.???
You were just complaining that you won't spend 600 dollars more to get a mag but you would of tried every avenue if you were me.. You make no sense

If i spent a crap load of money on a new fancy motor and already had a 148 mag pump that i had paid alot for then yeah i made that investment and sure as hell would have bought it in a way that i could use the different rings and cones. I would have spent a bit more to get the adjustable tuning parts that make up a complete magnum pump system. not mismatch a bunch of different parts. did skat design the pump for a thrust nozzle, no, and i am sure it is a nice nozzle that works good for your backflips. I also would have picked one prop that was not a steep pitch because it is a big pump. If it was no good i would play around with it by changing the cones and rings. So what did you do with the 148 pump? Sell it then buy have to start all over with building the 144. cause that sucks too. Maybe we should do a little canadian build off contest, your fancy engine builder speced A/M hull up against my homemade POS mudcat. lol.

 

[OCD Solutions]

You get hurt alot don't you?

 

[D-Roc]

no why? that one went way over my head.

 

[OCD Solutions]

Because you like to find out thru experience rather than listening. I just wondered if that applies to other things in life like, "don't touch that it's hot" or "don't play with fire, you'll get burned."

 

[D-Roc]

haha yes i am a button pusher, i walk by a button and before i can think i just pushed it and say
"i wonder what this does?" usually followed by "oh chit!"

the biggest problem with having a big mouth is i can fit both feet in it and have nothing to stand on. haha. okay i am passionate about learning, and its not right for me to point out things in hindsight against Jr. So i apoligize for not making sence sometimes, and being slow to convince of stuff that i have experienced otherwise of. Maybe we can do some good here and post up some spec people are using for their mag 144 pumps and also if Jr. Freestyle can tell us what he was running for the prop in the 148 and what he has now in the 144. Also if Steve Uk is reading, what did you have in your 148 mag for a prop.

keep the spec simpler.

displacement by SS or Stroker
PV yes/no
Total loss yes/no
mag pump size
prop pitch
setback yes/no.

 

[steve-uk]

my motor was pretty much stock with the normal bolt ons, head, b-pipe, enhancer, V force two reed, running stock 38s

i ran a 8-15.5 prop in the 148mag on the REV hull and it hooked up great

best pump i ever had, wish i had never sold it
​

 

[D-Roc]

thank you steve.

so:
discplacement: 701cc stock stroke
pv: no
TL: no
pitch 8/15.5
setback ?
reduction nozzle: ?

so would you say that the 148 mag pump gave you more or less performance and better bottom end from your 701, compared to your stock pump/prop combo.

 

[OCD Solutions]

How was the mid and top end with that combo?

 

[D-Roc]

steve can answer better but i did ride this setup for about 15 min. I was impressed that the ski grabbed water all the time no matter what. i don't recall it being a slug at all. i rode worse setup 701's.

 

[D-Roc]

steve, what reduction nozzle did you use on the mag 148?

 

[OCD Solutions]

I get the concept that the bigger pump moves more water and thus has more load but wouldn't it also have less back pressure and flow more volume? I would think that would be ideal for freestyle but would have very little top end, (which wouldn't matter on a freestyle boat anyway). Pitched correctly I don't see why it wouldn't work.

Isn't BUN running a 155 or 158mm pump in their pro skis?

 

[kevbo]

Cap the impeller T/E pitch at 17 degrees max. Vary diameter to match the engine.

 

[D-Roc]

that was my thinking but am more confused than anything at this point. i alway have done bigger is better.

 

[D-Roc]

Cap the impeller T/E pitch at 17 degrees max. Vary diameter to match the engine.

vary what diameter, pump housing or reduction nozzle outlet?

 

[Jr Freestyle]

I get the concept that the bigger pump moves more water and thus has more load but wouldn't it also have less back pressure and flow more volume? I would think that would be ideal for freestyle but would have very little top end, (which wouldn't matter on a freestyle boat anyway). Pitched correctly I don't see why it wouldn't work.

Isn't BUN running a 155 or 158mm pump in their pro skis?

I think you are correct, but they are using it with a 1200cc 16mm stroker

 

[D-Roc]

1200cc / 158 biggest motor and biggest pump.
650cc / 140 smallest motor and smallest pump.

can we do something with this data like find out if a 925cc motor would be at say a 149 pump which would be about 80cc off of 845cc and 1 mm difference of 148 pump? and does this mean anything. lol.

 

[Billybo455]

1" setback 148 mag
15/21 raider reduction and steering nozzle.
TL
50mm Full Specs
1200cc stock stroke

ski had enough hit to flatwater back flip and i swear, it felt faster up top then my octane.

 

[McDog]

My non pv 850cc ADA cylinder 5 mil stroker with total loss was matched perfectly with a 14/19 prop in a non setback 144 mag pump with a freestyle cone and a 85mm bored Thrust trim nozzle in an 76 pound BOB hull. I hope it works as well in a 60 pound Superfreak hull/hood combo.

 

[steve-uk]

thank you steve.

so:
discplacement: 701cc stock stroke
pv: no
TL: no
pitch 8/15.5
setback ?
reduction nozzle: ?

so would you say that the 148 mag pump gave you more or less performance and better bottom end from your 701, compared to your stock pump/prop combo.

no set back

stock reduction nozzle and atp turn nozzle

gave me a lot better bottom end, immediately i added huge height to my stabs, also had the ability to pull me out when i went wrong where as stock didnt

d-roc i dont know if you remember but i had this at wasaga and every one commented on the air i was getting, even off boat wae i was getting huge air, biggest air i have had

after that i went to the ss motor and was told that if that prop didnt work i was screwed as i would need an even taller prop with a 148... i dont know i wish i had ran it

when i went to the ss motor i went for a stock pump with tbm cone and thought it was the biggest waste of money ever, although to be fiar i didnt run a large hub prop

i swapped to a 144 set back mag and performance difference was night and day

in regards to the 148 and performance

bottom end - huge improvement
mid range - improvement
top end - no idea ... im not a racer

 

[D-Roc]

yeah i remember wasaga and that is where i rode it. i also rode that motor the year before in you RN hull with stock pump and the stubby cone i put on for ya. lol. The pump worked better than my tbm/skat combo.no doubt, but my motor still had a better hit with the total loss and displacement etc. i can agree that the tbm is nowhere near as good as either the 144 jetmaniac setback or the 148 non setback you had. i just run it because i knew i needed a better prop and tryed it out on a 828 that hit hard. i shot legdrag an email to send out what ever combo he sent to canada a few months back. It has worked good on the 828, 771, 735, and scott also has this legdrag combo and uses it on his pissed off ported 701. as good as it works i know now for sure the mag 144 would make all those combos work better. the cost is a biggy though so when i do it, i want the right one. So after all this crazy contradicting discussion you guys have convinced me to change my mind about the big mag pumps, and get the 148. haha.