I was wondering if any one else had this happen to there Sc,I installed the riva Sc wheel I heard it whine sound I took it apart and the housing all scratched up I sent to GP for repair and RR clutch kit it also whined and again scrathed the housing I also installed one in my buddys at the same time I checked tonight and it to had aluminum dust gone thought the motor when will it blow up with all that metal going thought the motor this is also going to GP for repair.

This is the first we've heard of this. Please don't take this wrong. Since the problem is occuring with both impellers that you installed it's possible you may have overlooked something during the installation process. Here are a few questions which your answers to might help to narrow down the cause.

Did you test your slip clutch to ensure that it was working properly prior to installing our SC Impeller?

Did you check for play in the impeller shaft prior to installing our SC Impeller?

Is the o-ring in place on the step collar?

What chemical did you use when cleaning parts prior to installing our SC Impeller?

What did you torque the nut to that secures our SC Impeller to the impeller shaft?

After torquing our SC Impeller did you spin it to check for smooth operation?

Rancart, if you are around I need to find out some more specifics from you ASAP please:

Are you saying the Vortech impeller rubbed against the housing on both your SC and your friends?

Were all the blades damaged or just the ones near where the air intake connects?

Was the housing damaged on both units or was the damage only on the impeller?

Did this happen with the stock clutch assembly or only with the RR clutch?

Thanks

When you say "housing", what do you mean? The silver hub encasing the impeller? Was there damage to the impeller itself or just the hub? Did you spin the aftermarket impeller all the way down to the base of the SC flush with the black coating? If not, then the impeller will stick out into the hub a little. Did you do anything to the clutch assembly on the back of the SC? If so, you might check to make sure the shaft isn't moving back and forth. That's all I can think of right now. But if you get more specific, I might be able to think of other things.

I know ALOT of people that have the Riva/Vortech SC impeller and this is the first i've heard of any issues. I think it had to do with excessive supercharger shaft end play... for whatever reason, or incorrect installation.

quote:

Originally posted by franko:
When you say "housing", what do you mean? The silver hub encasing the impeller?

Franko, the housing is the (body) of the supercharger that comes painted in orange in your 04' RXP and black in the new 05' RXP/RXT ski's. My neighbour ordered and installed a brand new one after his SC impeller issue.

I have used non oem SC impellers before and like to do the following. (non riva but I think riva SC impeller is a good design.)

After assy. rotate by hand and ensure it feels right. If not, find out why.

When I first fire it up, I run it on the trailer and squirt seadoo lube down the throat of the SC at idle for a minute or two, then while continuing to lube, I vary throttle building up rpm until I find the limiter. Then I take it a bit easy for the 1st 15 minutes of riding.

I prefer the tight tolerances and can live with a bit of touching but if you do the above, it wont score the housing. (the SC shaft bearings have a huge "c" rating to deal with heat and very high rpm so do not locate the impeller in the housing very accurately imho. But they obviously need this clearance between the inner and outer races and rolling elements.

The resulting aluminium dust you ingest through the engine does not harm anything. Its way softer than the valve seats, guides, rings and liner. I replace plugs after first tank.

Actually, I prefer a bit of touching as then I know the clearances are nice and tight.

Well, I have (25yrs) of experience setting up blowers and turbo’s. The Vortec is basically a centrifugal compressor like a turbo charger. The efficiency of the pump depends on the “tip clearance” to the housing fit. Generally, this is a liberal number of about .012-.02 inch clearance. The closer the fit the better… as long as it doesn’t touch…

( like it seems it has done in the above post’s.)

I will try to explain the set-up, keep in mind this is pump 101… not Riva specific or Vortec, but what I know about how to set up a compressor.

1) To size the impeller tip clearance you must first know what you have.
2) Assemble the compressor housing and leave the nut for the shaft off
3) With a indicator, move the impeller back and forth to determine the actual clearance before the impeller touches the housing.. (usually about .025 total back and forth clearance)
4) By using a shim on the backside of the impeller you can move the impeller closer to the housing to achieve the .012-.015 clearance. Or what the spec calls for.
5) Shims are sold in .003,.005 thickness usually..


That’s how you really set a centrifugal blower/turbo up.. If you just take out the old parts and put in new. You don’t know what you got (for clearence).. and this is why some people have better results than others. Measuring and checking your setup is the best way with any modification. That’s what the fast guys do….

Sorry I did nt get back sooner I was out in the garge installing the third sc I just got back from perry perf.this time we put the stock wheel back on Ill try it tomorrow.I installed the first sc wheel housing got scratched. Perry perf. installed the second one along wiyh rr clutch kit same wheel they checked every thing it also scratched housing thats when we jucked the vortec wheel.

Riva Crew, WTF is going on here??? I am trying to deleted the info that I posted yersterday in this thread and I can't. I only see this message. QUOTED:

ERROR

You have (not) been given the permission (s) to access this page you need the following rights to view this page. 'Edit deleted own post'. For a full list of permissions you have on this community please visit your (My space permission page).

When i check my space permission page all of them are with the green light on, so i really don't know what is goin on.

Riva crew, i need a big favor from you, can you please deleted all the info that I wrote in this thread yesterday?, thanks Ray

Just got back from the river sc wheel is not scraping since stock wheel was installed seen funny the vortec hit and damaged two housings and stocker was find. And thanks GP for the 75mph passes I saw on my gps.

Rancart, I am not sure what happened to you. I've personally seen two of those Vortech impellers run and helped install a third, and I haven't seen any of them hit the housing yet. Sorry you are having problems with yours. Are you sure you are installing it properly?

quote:

Originally posted by Gpr/STX-15F/RXT:
Riva Crew, WTF is going on here???

EXCUSE ME???????

ROFLMAO!!!!

mine now has 5 hours on the Riva impeller with no problems

I installed it as per instructions,than had perry perf. install the second housing and the third housing then the stock sc wheel was reinstalled and no this one worked fine.

Did PPG ever find out what was wrong? Did you do anything to the clutch assembly? With a 75 mph set up, I imagine you installed a heavy duty clutch. Am I right?

quote:

Originally posted by RIVA CREW:

quote:

Originally posted by Gpr/STX-15F/RXT:
Riva Crew, WTF is going on here???

EXCUSE ME???????

R/C, sorry about this, i was a little upset when I wrote that... Now, i will ask you for the second time, can you please deleted (ALL) the info that I wrote in this thread including this one?, Thanks, Ray

rancart, what mods you did to your RXP to reach this speed? hum....let me guess, Riva air cold intake, or maybe PPG "magic fan" .... R/R IC, R/R ECU, PPG repitched solas prop, Opas block-off kit and maybe a 81mm exit nozzle to round the package?

blink!!!
Nothing here !!!

This message has been edited. Last edited by: caribbeanultra,