Surfriding Mag pumps in surf boats

[sportfish258]

How will a lake tell you if it will be good in surf?

It won't ... But I did get an idea of how that pump loads a ltd 701. There is a Slight differance on the bottom probably do a nozzle swap .


Master blaster.... I set inserts when i did my build to use an extra ware ring. I'd like to hear more on this.

 

[mickw]

I use a skat mag in the surf connected to my ss865, all in my xfs, man I knew something wasn't quiet right

 

[ryallshire]

Yep something wrong wit them pics

 

[Watty]

Although I'm back on a Superjet with stock pump these days, I previously had a 140mm 8 vein (non set back) in my XFT running a Jetworks 6mm BB with total loss. It suited me perfectly. It would put the power to the water when the engine hit, and also hook up well in white wash. The best part about it is that it added very little cornering hookup, so once you initiated a carve/slide/reo with momentum, it was just like stock pump so it wouldn't grip up and high side when you were back on the throttle.

I think the stock pump with the right impeller/nozzle/cone combo is perfect for every day surf riding, but with every man and his dog running the big boy engines these days, it seems they are more of a requirement than a choice. What's the use of having all that power if you can't put it into the water?

 

[Offroadie]

You don't want Mag power in that ski... meet me back at the Trini style bar and sell it to me for dirt cheap! :lmao:

 

[djraider700]

Im running just a Factory b-pipe on an otherwise bone stock 701 and the Solas mag made a huge difference in both the surf and flatwater riding.

The stock 6-vane was designed for the 650 way back then and Yamaha just never updated it. It works, yes, but it's far from ideal.

 

[masterblaster]

It won't ... But I did get an idea of how that pump loads a ltd 701. There is a Slight differance on the bottom probably do a nozzle swap .


Master blaster.... I set inserts when i did my build to use an extra ware ring. I'd like to hear more on this.

Search my threads,I posted pics of it. I welded tabs on the front side of the reduction nozzle and used a couple oem shims to bolt it in the stock inserts. how did yours ride?I found it really loosened the nose at low speed surf turns,but somehow planted the nose better for high speed flatwater turns,compacted the crap outa real foamy reintry landings.It was still lighter than the solas mag even with the extra wear ring. I ran a slightly longer than stock rideplate with it,and liked it alot,later on d cut it and found out it was perfect before I cut it...lol

 

[Tanman]

I will only run mag pumps in all my skis now. I feel it is so beneficial not only in white water hook up but in chop, in power increase, your throttle does more to help you when you get it efficiently to the water. if you feel like there is too much hook up then you need to learn how to let off the gas and you'll slide and break loose as easy as anything else. bring some speed and turn then let off, and whenever you want it you have clean solid power

 

[CarterB]

i used to have an anti mag pump type of rider bc i only rode surf and the only mag pumps i tried were from flatwater guys bringing their skis to the surf (rare).
After going to california and riding much larger surf and much nastier white wash i realized a mag is really nice there and can be setup to work very well and not give that solid hook all the time feel that flatwater guys can like.
ive ridden some skis in the surf that literally could not slide at all until they were totally out from under you. i think the best resolution i came up with on these skis was to shim the prop away from the veins more and allow the pump to slightly cavitate before the violent re-hook. this allowed them to be much more playful and predictable with big motors in the surf.
FL surf doesnt have nearly as nasty white wash even on big clean days compared to what i rode in california (told they were average days too) so that will always be a bias when comparing peoples views as well from coast to coast

 

[Berky]

Hear here Carter , in mushy gutless FL surf a little slip and slide can be good thing for really " riding the wave" surf riding .

 

[masterblaster]

if your gonna shim the prop out on a mag to reduce immediate hookup,you may as well save the money on the mag in the first place and just run a stock pump with a hooker prop...very little diff in the white water hookup between the 2 setups if you dont have close clearance between your prop and stator veins on a mag.

 

[sportfish258]

if your gonna shim the prop out on a mag to reduce immediate hookup,you may as well save the money on the mag in the first place and just run a stock pump with a hooker prop...very little diff in the white water hookup between the 2 setups if you dont have close clearance between your prop and stator veins on a mag.

That was my point. I followed up with a realization on the nozzle thread. I switched out a 84mm for an 87 mm my last surf ride. I lost a ton of thrust on the 87 , but to my suprise it also loosened up the handling big time. I put inserts in for the extra ring like you did blaster I may just get a blaster shaft and bolt it up just for kicks.

 

[wydopen]

That was my point. I followed up with a realization on the nozzle thread. I switched out a 84mm for an 87 mm my last surf ride. I lost a ton of thrust on the 87 , but to my suprise it also loosened up the handling big time. I put inserts in for the extra ring like you did blaster I may just get a blaster shaft and bolt it up just for kicks.

what intake grate are u running?

 

[masterblaster]

That was my point. I followed up with a realization on the nozzle thread. I switched out a 84mm for an 87 mm my last surf ride. I lost a ton of thrust on the 87 , but to my suprise it also loosened up the handling big time. I put inserts in for the extra ring like you did blaster I may just get a blaster shaft and bolt it up just for kicks.

the blaster shaft works fine,and the pump hookup in whitewater with the extra wear ring with a smaller size exit nozzle is really good,I tried a 82 and 85 with the super setback pump I made and the pressure created with the smaller nozzle did way better in white water...same is true with a mag,they do so well because they create so much thrust at high pressure ... Im selling the super setback pump now. It worked great with a hooker 10/16 with a mild stroker surf motor. Im always tryn something diff though and using a 142 mag now with the same kinda motor setup. Smaller mags,140 142 work better for white water compacting than the 144 to 148 pumps. I have both now and have tried all 3 in the same ski. Im a true surf rider so to speak,riding waves,doing reintres and navigating whitewater is really important for my kinda ride style.
IF you want a dual purpose ski with a flatwater backie dream,a 148 is the way to go...but this hull is a dedicated heavy weight surf hull.Ill take a pic of the reduction nozzle mod that is a lil more easy than adding inserts in your hull.

 

[masterblaster]

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the steering extenion tube i put in the hole of the nozzle gives you a idea of the total setback...its holds ALOT more water in the pump

 

[ridethelip]

A little grip a little slip in the mushy gutless Pismo waves

 

[Sanoman]

That was my point. I followed up with a realization on the nozzle thread. I switched out a 84mm for an 87 mm my last surf ride. I lost a ton of thrust on the 87 , but to my suprise it also loosened up the handling big time. I put inserts in for the extra ring like you did blaster I may just get a blaster shaft and bolt it up just for kicks.

l was with the "Sportfish" with the different size nozzle,the last time we all rode in Savannah.Although that was my first time on the te-weeker hull,it seemed very loose in the azz end.Something l really like in the surf.

That trip was the first time for me with my ss865,solas mag with 11/17 hooker.Spins at lower speeds,so you had to ease into the throttle somewhat.l have to admit that my ss735 (same pump setup) is a much better surf combo.l want to try using another washer in the solas next time l go back.Cause the mag is awesome in the surf.lf that doesn't work,l'll flip my smaller engine back in and put the 865 in a new project.

 

[masterblaster]

sano...surprised to hear you cav that prop in a solas mag with a 865,what kinda setup you running on that motor? I see your hull is 65 lbs or so.Interested to hear why you think the 735 is a better surf motor? Im assuming you have the 865 setup as a flatwater purpose build with high comp and tl.
If you were trying to stay light I think you would do better with a stock pump and that same prop repitched to 12/18,than using washers on the heavyweight solas. your going to be reducing the pumps pressure to close to a stock pump..dont see any advantage in that just more money and extra weight?

 

[Sanoman]

sano...surprised to hear you cav that prop in a solas mag with a 865,what kinda setup you running on that motor? I see your hull is 65 lbs or so.Interested to hear why you think the 735 is a better surf motor? Im assuming you have the 865 setup as a flatwater purpose build with high comp and tl.
If you were trying to stay light I think you would do better with a stock pump and that same prop repitched to 12/18,than using washers on the heavyweight solas. your going to be reducing the pumps pressure to close to a stock pump..dont see any advantage in that just more money and extra weight?

MB,appreciate your interest.As far as the 735 goes.lt is basically a small version to the 865.PV's,duel 46's,just like it's larger brother.l've had that set up to the surf several times this year and liked the bottom that it produced.Seemed to me,it was a good set up.Would you agree that larger is not always better in the surf? The 865 has novi 48's but no tl and l run pump gas.Flatwater it runs fine.Savannah was the first time with the larger engine,so l need to change some things around to see if l can come up with a better combo.

l wonder the same thing about a stock pump and will bring it to the beach the next time l go.Be interested to read your opinion!

 

[sportfish258]

what intake grate are u running?

Worx 205 . It's not a bad ride , I'm just fine tuning .I want the best of both worlds try to find the mid point..... Loose when I want hook when I need it. Thought about going back to a stock ish grate just to see the differance.