New Impellers

[Drift Away]

So i took my SX240 in for the 100 hour service and i asked the guy the pros and cons of Replacing the impellers. Long story short i am getting new stainless steel solas impellers put on. Anyone change theirs amddid you notice a difference?

 

[Scottintexas]

Why did you change them?

Any Loss of performance?

 

[robert843]

@swatski did switch to them he went back to stock if I remember correctly.

 

[Ronnie]

I love mine. Got them from impros and they repitched only one of them as far as i can tell based on the tooling marks. My boat doesnt cavitate at all when going from idle to wot quickly so it sems to accelerate better i didnt notice any change in top speed but if there was any it was less than +/- 1 mph.

If you have a newer yamaha jet boat/one with a keel it may have come with impellers that have the same progressive pitch range. The older yamahas have impellers with slightly different pitch ranges.

Suggest you keep the stock units as spares or to sell to offset the costs of the new ones. Mine are collecting dust but i have the feeling the day after i sell or loan them out is the day i will need them.

 

[swatski]

This has been cover many times.
Solas may have some benefits, may be a touch smoother/quieter as compared to OEM, which is nice.
The OEM have the best design overall - for boats for sure. Longest blades and least prone to cavitation.

There have been several batches of Solas Concords that disintegrate (not good). Solas come shiny! (doesn't matter for performance). You can make OEM shiny, too (mirror finish) as they are also made of some kind of SS alloy, they just lack the mirror finish from factory. Actually, "race" finish for best performance is groovy, not mirror-shiny. Does it matter? Not in our boats.

If you are doing watersports - wake surfing in particular, I would 100% stick with the OEM. Add L13 and tweak the pitch on the port side, is the best one can do.

@Williamsone46 brought up an interesting point recently, something I had no idea about - the single engine OEM impellers apparently have slightly longer blades than the OEM twins! I have not verified it, yet, as my stuff is put away for the winter, but this is something I want to explore. The Port side impeller could use that - a swap to a properly pitched "single" OEM could be the remedy for that side over-revving.

Things are different when it comes to impellers pitched for high altitude. I am not very familiar with that, Impros has helped many guys with that, and I would take their word for it. However, it is an iterative process - no one has the magic formula. Its always trial and error - sending the impellers back and forth a couple of times. Whoever says otherwise is simply full of shit.

The key for performance is tight clearances inside the wear ring. It is in the manual - 0.03" or something like that - very tight.

EDIT: with the new yams it is LESS expensive to buy two brand new OEM impellers than to have them quality refurbished. Something to keep in mind. It boils down to $150 a side brand new - can't beat that. Impros will be a lot more, maybe twice as much, once you add all the extras and their shipping. On occasion they have sent back impellers to customers that have not been welded back to OD (outside diameter) specs - which costs extra. That is very bad.

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[Drift Away]

Why did you change them?

Any Loss of performance?

We park on the sand alot and i have seen a few knicks and dings in the stock ones. So ifiguer the SS ones will be harder.

 

[Drift Away]

This has been cover many times.
Solas may have some benefits, may be a touch smoother/quieter as compared to OEM, which is nice.
The OEM have the best design overall - for boats for sure. Longest blades and least prone to cavitation.

There have been several batches of Solas Concords that disintegrate (not good). Solas come shiny! (doesn't matter for performance). You can make OEM shiny, too (mirror finish) as they are also made of some kind of SS alloy, they just lack the mirror finish from factory. Actually, "race" finish for best performance is groovy, not mirror-shiny. Does it matter? Not in our boats.

If you are doing watersports - wake surfing in particular, I would 100% stick with the OEM. Add L13 and tweak the pitch on the port side, is the best one can do.

@Williamsone46 brought up an interesting point recently, something I had no idea about - the single engine OEM impellers apparently have slightly longer blades than the OEM twins! I have not verified it, yet, as my stuff is put away for the winter, but this is something I want to explore. The Port side impeller could use that - a swap to a properly pitched "single" OEM could be the remedy for that side over-revving.

Things are different when it comes to impellers pitched for high altitude. I am not very familiar with that, Impros has helped many guys with that, and I would take their word for it. However, it is an iterative process - no one has the magic formula. Its always trial and error - sending the impellers back and forth a couple of times. Whoever says otherwise is simply full of shit.

The key for performance is tight clearances inside the wear ring. It is in the manual - 0.03" or something like that - very tight.

EDIT: with the new yams it is LESS expensive to buy two brand new OEM impellers than to have them quality refurbished. Something to keep in mind. It boils down to $150 a side brand new - can't beat that. Impros will be a lot more, maybe twice as much, once you add all the extras and their shipping. On occasion they have sent back impellers to customers that have not been welded back to OD (outside diameter) specs - which costs extra. That is very bad.

--

They are shinny thats for sure. They are $230 each and $109 to install (1 hour or labor). Hope. It runs as good or betyer than stock.

 

[Ronnie]

Sounds about right, i spent a little more because i bought some tools and tried to do it myself. I think the pitch is going to make all the difference in the world when it comes to results. Did you have either repitched?