Cavitation on 230 wake?

[FloorStreet]

So we took the boat out, mostly wakeboarded all day, everything working fine.

At the end of the day when we whip it around to go home, I notice that when I leave the steering wheel, it doesn't go straight, it veers right. So I take a look at the RPM's and notice that the left engine is doing about 7000 whereas the right engine is only doing 2000 or 3000.

so I stop, take off again, and at first both engines go up at a constant RPM but within a few seconds the right engine goes back down to 3000.

I don't think this is considered Cavitation (from my understanding thats high rpms with no work)

So what is this called and what could the problem be?



Some things to note:

-probably 6 engine hours prior we sucked up a tow rope on this particular engine/impellar side. I cut off most of it (leaving a tiny bit melted on the impellar shaft) Although its been working fine since then, maybe things loosened up in there eventually?

-the engine itself sounds normal

-there were quite a bit of weeds that day and I think some were getting sucked up but would that cause this problem? Wouldn't weeds cause more of a caviation type problem? Maybe we should put it back in the water to see if it works right now that its cleaned?

So anyway, I'm thinking its something to do with the impellar, wear ring, or shaft right? Or is there a chance that just weeds/vegetations alone would cause something like this?


Thankfully, this happened right around the 10 hour mark so we're taking it in to the dealer anyway, but I would like to be aware of the possible reasons for this issue.

 

[sporsterjoel]

First is this a 430hp boat????

 

[FloorStreet]

yes it is 430 hp

 

[sporsterjoel]

ok first thing to check is the supercharger. Take the intake tube off and see if the supercharger impeller spins. If it does then you have a blown supercharger. What is the MAX rpm at WOT on the bad motor???

 

[FloorStreet]

the highest we went on the throttle was 3/4 since they said not to go full throttle before the 10 hour...

but yeah it was right around 2000ish

ill go check the supercharger right now

 

[sporsterjoel]

the highest we went on the throttle was 3/4 since they said not to go full throttle before the 10 hour...

but yeah it was right around 2000ish

ill go check the supercharger right now

Chech the charger isnt blown as that is a really big deal if it is. ALSO its ok to go WOT as its good for high performance motors like in these boats, it helps to seat the rings. Dont beat on it but getting up to tops speed wont hurt it. A good breakin is all about varying the rpms and not keeping it at a certain rmp for extended periods of time.

 

[FloorStreet]

Alright well I didn't have time to check the superchargers (I wasn't sure which tube to take off and decided not to mess with it)

Took it into service yesterday and still waiting for a call back. The guy seemed to suggest an issue with the impellar and the like but I still don't see how that would cause this issue.

If it is an issue with the impellar or wear ring or that area, I would assume it would be on us and the warranty would not cover it. But it would be a relatively quick fix right?

On the flipside,

A blown charger should be under warranty right? And probably a difficult, lengthy fix?


I'll post an update once I get a call back

 

[swissdoo]

hi, been there... i mean the supercharger job... but dont worrie, if the charger is gone you will get 5000rpm , not much less and not much more... had it on my first speedster 200, also the 430 hp version. and yes, it would be coverd... so i dont think this is your prob.. :hurray:

and, you wount find many boats with the charger problem. on the skis yes but not on the boats... i was told, from the BRP headq, that i was the only case in europe... and there are only a handfull worldwide.. i got a engine rebuild and a new charger even after the warranty time.. THX BRP :hurray::hurray::hurray:

i would bet you have some rope or weed in your pump, thats exactly what happens.... been there X times to....

see what the dealer tells you and let us know!

greez from over the pond

 

[sporsterjoel]

hi, been there... i mean the supercharger job... but dont worrie, if the charger is gone you will get 5000rpm , not much less and not much more... had it on my first speedster 200, also the 430 hp version. and yes, it would be coverd... so i dont think this is your prob.. :hurray:

and, you wount find many boats with the charger problem. on the skis yes but not on the boats... i was told, from the BRP headq, that i was the only case in europe... and there are only a handfull worldwide.. i got a engine rebuild and a new charger even after the warranty time.. THX BRP :hurray::hurray::hurray:

i would bet you have some rope or weed in your pump, thats exactly what happens.... been there X times to....

see what the dealer tells you and let us know!

greez from over the pond

search this forum there are ALOT of boat owners on here that have blown chargers. That why i always tell people to check that first when there is an rpm loss. if your not gettting full rpms then it wont be a wear ring.

 

[swissdoo]

well i did that before i did my post and could only find 2-3 cases.

2-3 or even if you can show me 10 cases is not ALOT as you state. i am talking about boats here, not skis.

 

[sporsterjoel]

well i did that before i did my post and could only find 2-3 cases.

2-3 or even if you can show me 10 cases is not ALOT as you state. i am talking about boats here, not skis.

YES i know your talking about boats and not skis :cheers: reason why you hear about more failures with skis then boats is because more people have sc skis then boats. the ski's and boats all have the same motors and drive line so why would there be less failures in the boats? not say 100% this is his problem, just telling to rule it out as that is the number one problem with these craft that cause an rpm loss. And saying that the boats dont have SC problems is radiculas as its a very well know fact that there are problems with the SC's and when your talking about a $5000 motor its good to address the problem and be sure that it hasent failed.

 

[swissdoo]

since it is just NOT possible to ride a boat like a ski. :reddevil:

you can have fun on the boat with playing like a ski but you would never do that for a as long as on a ski.

a boat pump will NEVER get as much air. one of the main reasons for the clutch fo fail.

as you say, it is possilble that we have a case here but i dont think its the best thing to always narrow down a problem to the SC issue. i am not saying this is what you are doing...:ack: its just that on forums like here folks that are interested in a new boat get the information we write..and if you look how many "supercharger issues" ended to be a piece of wood, a rope or something like that... not very good for BRP.

i am just thankfull for the amazing products i am allowed to have fun with, and a VERY happy BRP customer :hurray:

greez patrick

 

[sporsterjoel]

im not always right but 90% of the time i told people to check the sc it has turned out to be a blown charger (this is the #1 problem these new sc 4tec have) and its a major deal if they fail as the pieces of washer and bearing can wreck the timing chain and oil pumps so i always like to rule that out 1st, cause if it does have a sc failure you CAN NOT run the motor till its been cleaned out. That WHY i alway tell them to check that fist. Last thing i want is someone to run it and later find out the sc did fail and now there out $5000+ dollars. the sc are nitorious for failing 1000 and 1000 and 1000 of documented cases on the internet about the supercharger failures. I also have friends that jump there ski and never a failure but i also have friends that dont jump them and only ride on flat water and have had a failure with under 10hrs. also these boat can do all the same things the pwc's can. and the main reason they fail is its a sh!tty design and 2nd reason they fail is people use sythetic oil. Oh and the new X skis have been failing around the 50hr mark so keep an eye on it :cheers: also keep an eye on you pump tunnel as there have been repeated case of the tunnels blowing out. if you look close you will most likely see stress crack in the pump tunnel but more common on the RXT-X.

 

[swissdoo]

i will check my x soon, will get the 50h mark in the next weeks..

i know you know what you are talking about but its just not right if you say a boat can do the same as a ski. ok, it can, but you, the driver, cant.

( i dont refer to that small thing, 15 sportster or what its called) that is a ski.


pat

 

[sporsterjoel]

i will check my x soon, will get the 50h mark in the next weeks..

i know you know what you are talking about but its just not right if you say a boat can do the same as a ski. ok, it can, but you, the driver, cant.

( i dont refer to that small thing, 15 sportster or what its called) that is a ski.


pat

lol ya i know not a ski but its like a big ski. and yes you can get some good air with these boats LOL

 

[swissdoo]

:hurray::hurray::hurray:

wow!

 

[FloorStreet]

Alright so the dealer called and I guess I can breathe a sigh of relief and then slap myself in the face.

lol, apparntly the perfect pass system that comes equipped with our boat was accidently activated and set to limit the right engine to 3000 RPM.

I'm still not totally sure this is the problem. (fingers crossed though) But I'll be able to give confirmation in about a week when we take it out again.

What happened was we scrapped the bottom spindle that relays to the speedometer a while back, so the speedo/perfect pass display was all black. My dad was playing with it to get it to work I guess, and apparntly he turned on the perfect pass.

I didn't know perfect pass allowed you to set individual speeds for each engine, but I guess that shows I need to re-read the PP manual.

Anyway, Now we're just waiting for them to fix the fuel gauge and the speedometer and then I should be postin some wakeboard vids by next week.

on a sidenote (since we're on the issue) Do you think its wise to have the washers on the superchargers replaced with a stronger material (was reading about this issue for older models) Or what are the best ways to maintain a seemigly fragile supercharger?

 

[sporsterjoel]

Alright so the dealer called and I guess I can breathe a sigh of relief and then slap myself in the face.

lol, apparntly the perfect pass system that comes equipped with our boat was accidently activated and set to limit the right engine to 3000 RPM.

I'm still not totally sure this is the problem. (fingers crossed though) But I'll be able to give confirmation in about a week when we take it out again.

What happened was we scrapped the bottom spindle that relays to the speedometer a while back, so the speedo/perfect pass display was all black. My dad was playing with it to get it to work I guess, and apparntly he turned on the perfect pass.

I didn't know perfect pass allowed you to set individual speeds for each engine, but I guess that shows I need to re-read the PP manual.

Anyway, Now we're just waiting for them to fix the fuel gauge and the speedometer and then I should be postin some wakeboard vids by next week.

on a sidenote (since we're on the issue) Do you think its wise to have the washers on the superchargers replaced with a stronger material (was reading about this issue for older models) Or what are the best ways to maintain a seemigly fragile supercharger?

Hope thats your problem. seems funny to me you can set perfect pass for each motor. Ive never used the perfect pass but maybe another member will chim in about it.

 

[nova62]

seems the perfect pass only operates one engine its not attached to the other engine at all. but it works well