oh yeah, I forgot to ask - did you test the prop on the skat pump or a stock one?

that prop and skat pump are not compatible Ray

I got the green bellows and the black bellow cap from Speedwerxs. These are the ones Dan Lamey uses. I found that you have to find your engines sweet spot by adjusting the red caps.

Thanks Brian and Mario!

I have taken some pictures of the set back installed on my pump. They are on my website on the Tech/Mod page.

quote:

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Originally posted by ISLANDRACING:
Others are missing the point here too--the setback is a lot more $ than a regular 13/19----why spend extra $ for no reason when a 13/19 can be "trued" and made to perform exactly as a setback for much less. especially when almost everyone on the planet already has a 13/19 somewhere and doesnt feel like shelling out another 260$
Just saying to be a fair test---you must compare a setback to a 13/19 to IDENTICAL specs.
We all know about the inconsistencies of "out of the box" impellers.
For those who want to get the most out of their ski KNOW about the importance of at least starting with a trued impeller or knowing what the exact pitch is so "fine tuning can be made later on--
People want "out of the box performance" from there ski, just like the guy next to you---go with the "out of the box" impeller---bottom line.
Im sure many on this board would like to hear the results of the testing of a setback compared to an identical trued 13/19 -thats comparing apples to apples.

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This not, I repeat not, a regular 13/19 that we take out of the box and machine the hub. This impeller is specially made just for Riva by Solas. They start with a standard 13/19 mold and change the balde pitch (from leading edge to trailing edge) to our spec. Then the hub is machined allowing the impeller to move back on the drive shaft while using the impeller washer. Finally, the impeller is dynamically balanced at high speed to ensure smooth performance at high rpm. And, to top it off, we included our billet impeller cone. No offense to the 'prop shop' services being offered, but this impeller goes way beyond that.

To do all of the above to a standard 13/19 would cost you more than our 'out of the box' model. Not to mention the down time with sending out your prop to have the service performed. And there's no guarantee that you'll get the same results for the money.

Our Set-Back Impeller truly is 'out of the box' performance!!!

[ 08-06-2002: Message edited by: RIVA CREW ]

OK RIVA DUDE!!!!!

What can be done to the impeller to bring the RPM down without sacrificing performance. I am turning 7900+RPM's

Fercho

Fernando, to achieve your goal to cut down some peak rpms on your triple pipe boat you have to instal a bigger prop like the 14/20 but with the speed or I cut job to avoid a huge loss in your boat bottom end.

quote:

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Originally posted by Fercho:
OK RIVA DUDE!!!!!

What can be done to the impeller to bring the RPM down without sacrificing performance. I am turning 7900+RPM's

Fercho

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As with any impeller, you can make the trailing edge pitch taller. This should be done a little at a time. You don't want to make it to tall because it could potentially overload the engine in the peak power range.

I just called Riva (Brian I guess) and they said not to run to this prop on anything but SS skis. I asked specifically about Stage II's and he said no, only SS.

Are y'all finding this to be true?

I've heard the same repeatedly from Skat and Riva about Magnum pumps, yet there are many using them in limited class now on stage II boats with great success, makes me wonder who makes up these "rules" and whether they even bother testing the stuff on boats setup in different states of tune. Riva's print catalog says it clearly in black and white "Recommended for Stage II & III GP1200R/XLT1200's with impeller washer/spacer installed"

There must have been a misunderstanding. This impeller was specifically designed for Stage II & III GP1200R's. We don't recommend it for stock & Stage I models. It will work for Limited GP1200R's as well, but it may need some tweaking. Sorry for the confusion.

Riva Crew, I suggest you have a talk with Brian then, because he is constantly saying stuff like this, remember when he couldn't get me a Skat Swirl for my Magnum pump? Why does he always do this?

Riva Set back should be here on Thursday, will test it on my stage 2 this weekend. Gee I hope it works on a stage 2. Tried the jet works valve on my turbo tube, the mid, and the high were the same, but I lost my snap on the bottom. Per Pro Tec, the water flow is set for the best performance, glad it was only 40 bucks as it is comming off when I put the set back on.

quote:

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Originally posted by gp12trpl:
Riva Crew, I suggest you have a talk with Brian then, because he is constantly saying stuff like this, remember when he couldn't get me a Skat Swirl for my Magnum pump? Why does he always do this?

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Jarrett was mistaken. He spoke to another of our representatives. I have since reviewed the applications with our sales staff. Thank you.

lemme just say...thanks for setting things straight RIVA...and thanks Brian (WPP) for giving us "accurate" " Reliable" data...

it is nice to get the truth
the RPMs the Prop Pitch
the Conditions you run in.

and Riva ....that Prop is bad A$$

Riva,

I hope you mean I was mistaken in that I didn't speak to Brian, which may be the case; but whoever I spoke with did tell me the setback was for SS only, and not for the Stage II. Thanks for clearing that up.

Jarrett

quote:

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Originally posted by RIVA CREW:


Jarrett was mistaken. He spoke to another of our representatives. I have since reviewed the applications with our sales staff. Thank you.

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Yep, that's what I said.........

Thanks...........