Impeller pitch

[ScarabMike]

Im planning on it when I change out my impeller on my 300. Soon!

 

[SVTSINR]

Have you done this yet? This could possibley give more mph. Someone needs to try this and report the difference.

Faith, can you confirm which impeller you have? Either the SRZ or SRX?

TIA

 

[Faith Johnson]

Faith, can you confirm which impeller you have? Either the SRZ or SRX?

TIA

SRX

 

[wango tango]

I was just informed that if you go with the 14/19 you need to go with the SRZ 14/19(2009 and up) because it has the shaft setback (2mm).
the SRX 14/19 does not(for 2009 and older). I looked at my impeller and I have a setback on impeller.

 

[wango tango]

First picture is the SRX impeller with no setback.
Second picture is the SRZ with the setback.

 

[SVTSINR]

Are they saying the impeller will be 2 mm shallow in the wear ring?

 

[wango tango]

Well I will say that if I went with the SRX impeller the back of the impeller will be 22mm further away from pump vanes.
The tech told me that that 2mm could have performance issues.
It does bring the impeller forward and he said could possibly??? Push on shaft which could??? Push on carbon seal.
I don't know if that is true but I did measure both impellers and there is 2 mm difference.

 

[wango tango]

Bottom line is there may not be any issues, just wanted to inform everyone want was found.

 

[wango tango]

22mm In prior conversation is incorrect should have said 2mm

 

[Patrick d]

No. I just replaced mine with 159 mm. I got pitch 14/19. I also have the 195 HOI. I went with the steel wear ring and gained 5mph in speed.

so you changed out your 161 mm impeller and wear ring for 159mm solas 14/19 and gained 5mph?!? So what's your top speed now?

 

[Faith Johnson]

No it already had 159mm

 

[Derek Morris]

@Faith Johnson where did you get your impeller? I have the 2014 195 HOI and have some of the same issues with 6 people on the boat. If you could provide a link I would greatly appreciate it.

 

[Faith Johnson]

Impeller ring https://www.ebay.com/itm/152473283209
Impeller
https://www.ebay.com/itm/302159465955

 

[Jwood1508]

All, this has been covered in here hundreds of times. The 250's have a 159mm impeller and wear ring. The Scarab site is incorrect.

So this is an old thread but I purchased the incorrect part due to reading post like this one. I purchased a 159mm ring for my 2014 scarab 195. The factory one is definitely a 161mm in my boat. So there goes $50. Maybe some people do have 159mm impellers idk. I suggest anyone buying a ring pop out the old one first and measure to make sure so you don’t make the mistake I did.

 

[madscientist]

My 2018 195 also has the the 161mm.