Surfriding Skat C75 impeller in stock pump without the TBM stuffer?

[OCD Solutions]

We've covered this topic alot lately in a couple different configurations but there have been no comments yet about running the Mag impeller without the TBM.

I'm putting together an experimental pump to try in my SS865 Matrix and have everything I need except the pump stuffer. Has anyone run this combo yet and what were the results?

I guess my big question is, would it be better to run a Hooker impeller rather than a Mag in this situation?

 

[GIL]

We've covered this topic alot lately in a couple different configurations but there have been no comments yet about running the Mag impeller without the TBM.

I'm putting together an experimental pump to try in my SS865 Matrix and have everything I need except the pump stuffer. Has anyone run this combo yet and what were the results?

I guess my big question is, would it be better to run a Hooker impeller rather than a Mag in this situation?

I have done what you were talking about and in MY situation the MAG worked MUCH better without the TBM. HOWEVER-when I went to the Hooker-things got even better. 85mm nozzle, wet wolfe stubby cone, stk washer behind prop for spacing.

 

[Mark Gomez]

I run a stock pump with wammer pumpcone a 205 worx toploader an LPW bored nozzle and a hooker prop. I get outstanding hook up with my big bore 701/760

 

[XJCrawler]

I'm going to be running a c75 with out a tbm cone pitched by Jetworks. In a month I'll have a great comparison with the c75 and the hooker. Munki63 and I both have bigbores and were going to try swapping pumps

 

[Big Kahuna]

I run a stock pump with wammer pumpcone a 205 worx toploader an LPW bored nozzle and a hooker prop. I get outstanding hook up with my big bore 701/760

hey Mark, which Hooker are you running.........


Hey Boyer, Kevin Collins (Legdrag.com) use to recommend the C75 years ago without any kind of TBM Pump Cone. It works on some setups.

Hey, do you have a 9-15 Hooker lying around??

 

[weston]

I just went through all this with David/Impros a few months back when i picked up a set of mag pumps.
it's my understanding (from David @impros) that a mag impeller cut back for a mag pump will not fit in a stock pump unless shimmed out away from veins.
there is a difference between a mag impeller and a c75 impeller
c75 just means big hub.
mag impeller means c75 and it has been setup to run in a mag pump, cut back as far as it can safely go without touching there veins.
basically if you buy a mag from David/Impros the impeller you get will be set up to run on that mag pump machined to match.


this is approx the range you can setback the impeller on a given pump:
stock pump approx 3mm cutback/setback on the impeller
mag pump approx 7mm cutback/setback on the impeller
my hooker is 7mm cutback/setback on the impeller
idk why the hooker can be setback further id guess because its Davids brain child and he knows what works and found a way to do it.

i would think a hooker would work best as it uses more features from a complete mag pump. rather than running a c75 with a 3mm cutback id run a hooker, still has the c75 but with a larger cutback, setting the impeller that much closer to the pump veins.
when in doubt shoot David an e-mail. he is the authority on this.

 

[Waternut]

I can't comment on the SJ pump or in direct comparison to the hooker. However, I ran a 12/17 small hub swirl in my kawi 750 pump and switched to a 10/18 C-75 swirl prop. I tried to convince myself that the 10/18 was better and it may have been but really I couldn't tell a lick of difference. It's not a super accurate comparison but seat of the pants proved no difference.

 

[OCD Solutions]

I run a stock pump with wammer pumpcone a 205 worx toploader an LPW bored nozzle and a hooker prop. I get outstanding hook up with my big bore 701/760

I get awesome hookup with my current 144 setback Mag pump with a 14/19. So much in fact that I'm looking to loose some. Even though I shortened my hull and did everything else to match Scott's Matrix, his boat continues to slide better than my ski and is still hands down a funner ride.

I'm going to be running a c75 with out a tbm cone pitched by Jetworks. In a month I'll have a great comparison with the c75 and the hooker. Munki63 and I both have bigbores and were going to try swapping pumps

I have already experienced the hookers in stock pumps, (first a 9/15 and then a 10/16) behind a race ported bigbore(760), I am looking for insight with bigger motors like the SS865.

Hey Boyer, Kevin Collins (Legdrag.com) use to recommend the C75 years ago without any kind of TBM Pump Cone. It works on some setups.

Hey, do you have a 9-15 Hooker lying around??

That was before the Hooker was available, I wonder what he would reccomend now?
I don't have a spare 9/15 at the moment and I already sold off the 10/16 that was in my wifes ski before I upgraded her to a 140 Mag.
If the OEM pump with a 10/16 is going to be the recomended setup then I will stick with my current Mag. I rode that setup in my 07 for a year or so and while it worked well enough, the Mag pump is just so much better and i could never go that far back.

I would think a hooker would work best as it uses more features from a complete mag pump. rather than running a c75 with a 3mm cutback id run a hooker, still has the c75 but with a larger cutback, setting the impeller that much closer to the pump veins.
when in doubt shoot David an e-mail. he is the authority on this.

I sent Dave an email last week and still heven't heard back yet, figured I'll stir up some convo on here while I wait.

The easiest option for me to test right now is the 14/19 impeller out of my Mag pump, which as Weston points out, may or may not work without some major shimming. :scratchchin:

Another option would be to find a Hooker but I think the 10/16 would be too small and the 11/17 would cavitate too much. If only I hadn't sold my wifes stock pump off so quick. :banghead:

A third option is to try to find a non setback 12 vane mag and see if the non setback version gives me the same thrust but without the surf hookup...

 

[Big Kahuna]

eerrrr, If anything the 10/16 would cavitate before the 11/17 would. I am not up on what pitch props on Mag Pumps. I know the 10/16 worked well on my Big Bore, I am back to a 82mm TLR ported cylinder. Wanting to give a 9/15 a test. I had a 9/15 briefly back in the fall, but it went into another project, never made the time........ Dooohhhhhh.

 

[OCD Solutions]

The 9/15 was way to small for my 760 so I know it would never work on my SS865. The 10/16 might but I think it may run out too soon as well.

I have read some where that the 11/17 was not as good as the 10/16 and that it actually cavitated more. Perhaps the magic of the Hooker's only exists in a small window?