Apollo - SX190 Cavitation / Pump Efficiency

[Appollo]

Does anyone have pictures and more information on this maintenance especially for cavitation prevention.
I'm interested in the best power producing maintenance without.
Messing with the engine also.
Any direction would be appreciated.
Thanks

 

[Speedling]

Does anyone have pictures and more information on this maintenance especially for cavitation prevention.
I'm interested in the best power producing maintenance without.
Messing with the engine also.
Any direction would be appreciated.
Thanks

Best thing would be tuning your impeller and pump for optimum performance.

 

[Appollo]

Best thing would be tuning your impeller and pump for optimum performance.

Best thing would be tuning your impeller and pump for optimum performance.

That is my thoughts thanks for the affirmative. Who or can you direct me where to get good information and results.

 

[Speedling]

That is my thoughts thanks for the affirmative. Who or can you direct me where to get good information and results.

Impros does a great job.
What rpm are you hitting at maximum speed?
Do you pull wakeboarders and tubers much or more concerned with top speed?
Other than Impros you can polish up the pump quick and keep it clean with silicone spray. Grease your bearings and make sure everything is sealed up well. A jet pump isn't very efficient in the sense that it has to be sucking water upwards and then compress it as well. As well as the friction along the walls of the pump. The engines are more efficient than their car based v8 counterparts for the most part and that is where we let our boats really shine.

 

[Appollo]

Impros does a great job.
What rpm are you hitting at maximum speed?
Do you pull wakeboarders and tubers much or more concerned with top speed?
Other than Impros you can polish up the pump quick and keep it clean with silicone spray. Grease your bearings and make sure everything is sealed up well. A jet pump isn't very efficient in the sense that it has to be sucking water upwards and then compress it as well. As well as the friction along the walls of the pump. The engines are more efficient than their car based v8 counterparts for the most part and that is where we let our boats really shine.

Yes we pull tubes and ski's. I can hit 8000
Rpm we usually cruise at 6500.
8000 is about 44 mph.

 

[Speedling]

Next step is to call impros and see what theu can do for you and what it costs.

 

[Appollo]

Next step is to call impros and see what theu can do for you and what it costs.

Thanks I will update.

 

[swatski]

Yes we pull tubes and ski's. I can hit 8000
Rpm we usually cruise at 6500.
8000 is about 44 mph.

What @Speedling said! But running that high RPM, you must be having a ton of slippage/cavitation.

If I were you, I would start by taking the pump apart, it really is not too much work. Check the condition of your impeller and wear ring. Post some pics, and we can probably give you something to help.

One word of caution with Impros, they are premier impeller re-builder, but make sure you chose a "repair service plan" (or whatever they call it) that will take care of your impeller every possible issue, not just the leading and trailing edge and repitch.

 

[Appollo]

What @Speedling said! But running that high RPM, you must be having a ton of slippage/cavitation.

If I were you, I would start by taking the pump apart, it really is not too much work. Check the condition of your impeller and wear ring. Post some pics, and we can probably give you something to help.

One word of caution with Impros, they are premier impeller re-builder, but make sure you chose a "repair service plan" (or whatever they call it) that will take care of your impeller every possible issue, not just the leading and trailing edge and repitch.

Ok I have it out in the shop I'm heading out to take a look and some pictures.
Thanks

 

[Appollo]

Ok I have it out in the shop I'm heading out to take a look and some pictures.
Thanks

 

[Appollo]

View attachment 38152

Ok I have it out in the shop I'm heading out to take a look and some pictures.
Thanks

What @Speedling said! But running that high RPM, you must be having a ton of slippage/cavitation.

If I were you, I would start by taking the pump apart, it really is not too much work. Check the condition of your impeller and wear ring. Post some pics, and we can probably give you something to help.

One word of caution with Impros, they are premier impeller re-builder, but make sure you chose a "repair service plan" (or whatever they call it) that will take care of your impeller every possible issue, not just the leading and trailing edge and repitch.

Just reread the top part. Cavitation only at take off at full throttle. But catches up quickly. From then to 44 no slippage.

 

[swatski]

Yes we pull tubes and ski's. I can hit 8000
Rpm we usually cruise at 6500.
8000 is about 44 mph.

The 8000RPM part is making me wonder about cavitation. You shouldn't be able to run that high unless you cavitate, certainly not with an OEM impeller (and stock ECU). At 8000 you are hitting the factory rev limiter:


That can happen during hole shot, when you can hit the rev limiter a couple of times, but once you get going your boat should not rev past about 7700-7800 max.
Keep in mind, even with ribbon delete many 190s will not go that high (7800). If you are consistently running at 8000, something is not right.

From your picture - the impeller and wear ring looks okay, at least there is nothing obvious. But I think you will have to pull the impeller to really look at it. And then inspect the sealant around the wear ring.

Is 44mph measured by GPS or boat speedo? If it is GPS, and you run 44mph consistently, I would say you are not very far off from your boat's full potential!

Except that you do not want to be running on the limiter. If I were you I would try to find the source of cavitation (or impeller slippage). If it is the boat's speedo's 44 max - than you have even more reason to explore it further because you should be running faster speeds, probably around 44mph GPS, at 8000RPM.

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[Appollo]

The 8000RPM part is making me wonder about cavitation. You shouldn't be able to run that high unless you cavitate, certainly not with an OEM impeller (and stock ECU). At 8000 you are hitting the factory rev limiter:

View attachment 38161
That can happen during hole shot, when you can hit the rev limiter a couple of times, but once you get going your boat should not rev past about 7700-7800 max.
Keep in mind, even with ribbon delete many 190s will not go that high (7800). If you are consistently running at 8000, something is not right.

From your picture - the impeller and wear ring looks okay, at least there is nothing obvious. But I think you will have to pull the impeller to really look at it. And then inspect the sealant around the wear ring.

Is 44mph measured by GPS or boat speedo? If it is GPS, and you run 44mph consistently, I would say you are not very far off from your boat's full potential!

Except that you do not want to be running on the limiter. If I were you I would try to find the source of cavitation (or impeller slippage). If it is the boat's speedo's 44 max - than you have even more reason to explore it further because you should be running faster speeds, probably around 44mph GPS, at 8000RPM.

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I was just rounding the number. It may be 7800. But no never hit the rev limiter.
I'll watch closely tomorrow.

 

[swatski]

I was just rounding the number. It may be 7800. But no never hit the rev limiter.
I'll watch closely tomorrow.

If the 44mph speed is by GPS then, well... you have got yourself a great running 190!

There are things you can do about cavitation out of the hole. I would HIGHLY recommend the Lucky 13 cone to anyone willing to put some effort into it. If you look at the L13 thread here, might as well start reading from the back, probably most useful information is there, like page 2 post#37 here:
https://jetboaters.net/threads/anyo...ce-adjustable-pump-cone-in-a-boat.7967/page-2

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