Decisions

[Vumad]

Been doing some work today to upgrade the X2. I have to select a prop and an intake grate. I'm going to keep one scoop style grate and sell the other. I need to know which props I should keep and which to sell.

The most important change is to upgrade the pump. Which prop should I run? Here's the list... They are all Skat Trak.

9/17
10/18
15 (might be 15.5)
4
55

I also need to select which scoop style intake grate I should keep for surf. The silver one has no name, the black one is made by PJS.

The pics of the intakes are from my new phone. It's incredible.

 

[Vumad]

Ps. as a reminder...

Running in an X2. Set up is stock 750 twin carb, westcoast pipe, stock water box, one of these intake grates, and the nozzle I'm running right now is the stock nozzle (but I have a PJS aluminum race nozzle to upgrade to).

Looking for a good all arround prop. My emphasis is on bottom end but I still want to have some top end to keep up witht he couchers (at least 40 mph).

Thanks.

 

[madscientist]

those are both toploaders the silver will load more than the black and i think it looks like the r&d i like the black one ti may be a good medium between a scoop (2 bar) and your silver larger toploader

w/ the 750 the 10-18 may be your best choice and i may be interested in the 9-17 for my extra pump.

i'm running the 15.5 now and it pulls great and runs well into the 40's

 

[orangefinger]

pic from the phone ?

What phone is that ? that pic is crystal clear ....

 

[Vumad]

the LG EnV

Edit: and it resized the image. It was 1600x1200. It was huge.

 

[Vumad]

I have 4 different styles of intakes.

The black toploader
The Large silver top loader
The 2-bar that sits flush with hull
A 2-bar that sticks about 1" below the hull

I do not have any deep scoops, which I would assume would have been the best choice.

 

[madscientist]

the 1" 2 bar would be a deep scoop

it directs more water during lateral motion

i'd like to try the black 1 myself

i had a lrge toploader on my mod 550 and it stuck like glue/ wanted a little slip

 

[shawn_NJ]

Silver is R&D, I have it on my spare 750 X2. Its not bad. I'd run the 9/17 or 10/18, if you already have it. My 15.5 cativated pretty bad and I swapped to a 9/17 and it hits hard down low.

 

[Crab]

Funny, I have both also and not using either. I am having much better results now with the SXR prop with a standard 2 bar scoop, not the deep one. Plenty of pump loading, and still works good in the surf. The RnD will give you power brakes and scrub a few mph off the top. The PJS is really close to the RnD, maybe a tiny bit less but not much. RnD also created a small vibration under hard acceleration from a dead stop (since the wing actually hinders flow until your moving), throwing the pump slightly out of balance. The 2 bar allows full power dead starts, pump fills easier with no forward movement.

 

[madscientist]

theres always the mod of removing a 2" section from the center of the wing for the best of both worlds (supposedly)

 

[madscientist]

any luck on the crabbies?

 

[w-nut]

im running the silver one at the moment as people are saying it looks like a r&d . iused to run the black one but i lost it int the surf when it riped the insurts out the front off the hull. i liked the black one better for sone reasoin and wish i still had it

 

[Vumad]

I went with the 4 whatever that means. I don't know what the pitch is. All of my pumps are starting to bubble. I'm looking to have the pump resleeved so I can run the 10/18 w/o damaging it. The 4 clearanced and that is why I am using it instead.

The stainless impeller has much less cavitation. I dind't change anything so I could compare impellers fairly. I didn't get to try the intake grates out.

 

[shawn_NJ]

Wow if the 4 is a strait 14 pitch, you are gonna have some hell of bottom end hit!

 

[dbrutherford]

I agree it is an R&D. Look between the two bolt holes, the name should be cast on it there. Post pics of the other intake gates. The two bar deep grate sounds liek a westCoast one. Those were a decent two bar grate. I figure with a 750 you will need a 10/18 or a 16 degree brop or bigger. I bet a 9/17 or a 14, 15 straight pitch will cavatate the pump when you pin it from a dead stop or a slow cruising speed to pinned throttle. If you want easy prop changes put the 75- pump from your donner ski in the X2 as well.

 

[sflsurfrider]

Funny, I have both also and not using either. I am having much better results now with the SXR prop with a standard 2 bar scoop, not the deep one. Plenty of pump loading, and still works good in the surf. The RnD will give you power brakes and scrub a few mph off the top. The PJS is really close to the RnD, maybe a tiny bit less but not much. RnD also created a small vibration under hard acceleration from a dead stop (since the wing actually hinders flow until your moving), throwing the pump slightly out of balance. The 2 bar allows full power dead starts, pump fills easier with no forward movement.

youre using an SXR prop in your 650 pump? did you have to mod anything to get it to work?

 

[Crab]

youre using an SXR prop in your 650 pump? did you have to mod anything to get it to work?

Send it to Impros and have the front and back cut. They are good props, I am running one now.

 

[Vumad]

I agree it is an R&D. Look between the two bolt holes, the name should be cast on it there. Post pics of the other intake gates. The two bar deep grate sounds liek a westCoast one. Those were a decent two bar grate. I figure with a 750 you will need a 10/18 or a 16 degree brop or bigger. I bet a 9/17 or a 14, 15 straight pitch will cavatate the pump when you pin it from a dead stop or a slow cruising speed to pinned throttle. If you want easy prop changes put the 75- pump from your donner ski in the X2 as well.

I didn't see a name, I'll check again and post pictures of everything I have now that I can use my phone to get pics.

How much work is it to swap the pumps out? Really I don't care about having an easy prop change. Once I select the prop, it's going to stay in there. I'd switch to the 750 pump if I'd get better preformance and reliability, but I'm not willing to switch just so I can play with the props.

I didn't have any problems with cavitation yesterday with the 4 except when I was bouncing over small chop it wasn't getting water. I think the toploader will fix that. (keep in mind I might still be running too rich and not having all the power I should) I need to get my pump resleeved so I can use these other props.

It's going to be a bit before I can test again. My head is damaged, so I'm going to pull the engine and replace the bad wires and cooling lines and checkj the bearings etc.

Can someone post the positives and negitives of running 650 vs. 750 electronics in the 750, which is preferred (and why)