SXR Prop Advice...

stoner

stoner

Location
England
Posting from across the pond and can I say what a great source of knowledge this site is, been reading for a while so thought it bout time I joined up.
After a bit of advice on what to do with me prop....
2004 SXR, wet pipe, blowsion filters, blowsion freestyle pump cone, worx intake, stock plate and currently an unmodified solas dynafy 13/22. Over winter will probably be fitting an ADA head and don't know wether to fit the dynafly 14/23 that's sitting in me garage or get the 13/22 played with... not really worried about top end...

Cheers in advance for any advice:veryhappy:
 
stoner

stoner

Location
England
Cheers, thats what I was hoping.... I tried the 14/23 for about an hour and took it straight off, felt like starting in 2nd gear.
 
G

gdavie

Location
alabama
I have 2009 sxr with wet pipe, ada head 175psi, proks, tbm intake grate/ride plate, tbm pump cone. I put a 13/22 dynafly 5mm set back bent to 13/23 and the ski will not pull the prop.

Going back to stock. The stock prop spun off bottom but way better than 13/23. I will probably have bent to 12/21 like suggested above.
 
Big Kahuna

Big Kahuna

Administrator
Location
Tuscaloosa, AL
gdavie said:
I have 2009 sxr with wet pipe, ada head 175psi, proks, tbm intake grate/ride plate, tbm pump cone. I put a 13/22 dynafly 5mm set back bent to 13/23 and the ski will not pull the prop.

Going back to stock. The stock prop spun off bottom but way better than 13/23. I will probably have bent to 12/21 like suggested above.
Click to expand...

YOu went up in pitch, not down, That is way to steep for a miled limited.
Send it back to IMPROS to get repitched.
 
G

gdavie

Location
alabama
Big Kahuna said:
YOu went up in pitch, not down, That is way to steep for a miled limited.
Send it back to IMPROS to get repitched.
Click to expand...

That is what was recommended. Wish I had known would have saved a lot of time fooling with the wrong prop.

I know several people using the dynafly 13/22 and the seem ok and they are not running a pipe or head. Do you think repitching to 12/21 would work best? I heard the stock prop is 13/18 and I cavitated off bottom with it.

Thanks
 
Shonuff

Shonuff

I've got the glow
Site Supporter
Location
Memphis
The difference between the two numbers is the "spread" of the prop. Essientially, the smaller the number, the less water flows through the prop but the prop spins easier. The first number is the leading edge or the bottom end punch and the last number is the trailing edge or the top speed.

13/18 - Stock - this will spin the fastest with its smaller spread. It will bite the hardest and get to the top speed the fastest.
13/21 - This will have the same bottom end as the stocker but will be harder to pull through the range of the prop due to the larger spread. It will push a faster top speed though.
14/23 - This will start slower but have the fastest top speed. Like your "second gear" simile stated above
9/17 - slow top speed but tons of bottom end (though the Kawi motors aren't really ported to be bottom end friendly which leaves many a rider a little put out about the bottom end grunt they're after)
 
Hirschfelt

Hirschfelt

Location
Buffalo, NY
ok, so i am having a terrible time getting my ski tuned in. anyone have a big bore 800 fully ported? I am running stock 140mm pump. My motor spins the stock prop like crazy. Have a C75 15/20 swirl with 18 for root pitch. It was actually 17/21 from skat. at the time it was pitched to big very sluggish off bottom. Had it repitched lower to 15/18 - ThenGot the MSD TL programmed better spun that pitch now and it i spinning it at a pitch of 16.5/18. Bottom has nothing to it. Going to send it back to get it pitched a bit higher on the leading edge. Thinking 17.5 or even making it a straight 18. any suggestions are greatly appreciated. I do realize it is just time at the water getting it pitched properly. Any thoughts that my pump is too small. I know Malone uses the 142mm mag on his stock bot setups and the 145mm mag on the more worked motors.
 
Scorn800

Scorn800

Ride for life
Location
North NJ
I run a c75 9/17 on my surf boat. Great bottom end.
You must tune with a tach to see where you are and what size nozzle you should be using
 
Shonuff

Shonuff

I've got the glow
Site Supporter
Location
Memphis
Hirschfelt said:
ok, so i am having a terrible time getting my ski tuned in. anyone have a big bore 800 fully ported? I am running stock 140mm pump. My motor spins the stock prop like crazy. Have a C75 15/20 swirl with 18 for root pitch. It was actually 17/21 from skat. at the time it was pitched to big very sluggish off bottom. Had it repitched lower to 15/18 - ThenGot the MSD TL programmed better spun that pitch now and it i spinning it at a pitch of 16.5/18. Bottom has nothing to it. Going to send it back to get it pitched a bit higher on the leading edge. Thinking 17.5 or even making it a straight 18. any suggestions are greatly appreciated. I do realize it is just time at the water getting it pitched properly. Any thoughts that my pump is too small. I know Malone uses the 142mm mag on his stock bot setups and the 145mm mag on the more worked motors.
Click to expand...

I've got a ported big bore ski also but run a Solas mag pump with the stock prop. (After trying about ten different props, I think I'm running a stocker.) Try Scorny's 9/17 with a TBM pump cone and an 80mm nozzle.
 
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