Dasa 850 impeller pitch (144mm 12 vane pump)

[freeride_motz]

I'm chasing some advice on my impeller pitch.
Current setup:
Krash 2017 Predator
DASA 850
144mm 12 vane solas pump
MSD enhancer
JSA Flywheel being installed in a couple weeks
Dual 46mm Mikunis
B Pipe (limited chamber)
12/18 Solas large hub
72kg rider

I guess I'm just looking for some experience on impeller pitch for my setup. Do I have the right pitch? Should I go up or down to get the most out of what I have?
I have no plans on going up in pump size. I can justify the new impeller if I need it though

 

[Big Kahuna]

I would say around a Hooker 11/17

 

[freeride_motz]

@Big Kahuna you reckon I should drop my pitch? Excuse my naivety on this topic, can you explain why I should go shorter?

 

[Blue]

How does it feel right now? If its a heavy hull which i think krash are the 11/17 will be snappier. The Dasa 850 engines arent known for bottom end power so it would help bottom end. Whats the nozzle diameter and pump cone size?

Sent from my SM-G781U using Tapatalk

 

[Big Kahuna]

@Big Kahuna you reckon I should drop my pitch? Excuse my naivety on this topic, can you explain why I should go shorter?

I missed the part about prop you had. I had originally typed 11/17 or 12/18. But You cannot compare a Solas 12/18 to a Hooker 11/17 and think they are just 1 degree different. The designs are different and while the numbers may be the near the same they can be worlds apart on what they will each do!. That said, how does your Solas feel, Do you feel like your punching a hole in the water (Too small of a pitch) or does it feel like it wont get going? (To tall of a pitch). Here is an example of the Hooker props. 9/15 for stock to mild,
10/16 for Mild (Pipe and Head) to Porting up to Big Bore 84/85mm with Porting,
11/17 Mod (Porting, Porting for Racing, High Compression Head, Larger Carbs ex 46-48mm 800cc motor, etc etc.............
12/18 would work for previous possibly,

When you look at prop pitches per mfg. Look at the range of each design.
Skat will have say a 7/12, 8/13, 9/14,10/15 or 11/17, 12/18, 13/19, 14/20
Solas 12/15, 13/16, 14/17, 15/18 or 14/18, 14.5/18.7, 15/19, 16/20

So, you can see there is a progession, the lower number in simple terms is for a stock motor, highest for a more build motor. You can take 2 props and they will both will work, one will typically have less bottom and more top, or vs versa on the other prop. Figuring out the right prop is just part of tuning and can be difficult. Brian at Torrent Pumps is really good at helping to pick prop pitches. Dave at IMPROS was good as well (He sold it to Glen Perry I believe), I do not know the new owner.
Hope this helps and did not confuse you.

 

[kevbo]

I have some experience with the large hub Solas 12/18. It was the only size available and I had to make it work on a 701, which it did after a LOT of bending.. Ill say, out of the box, this 12/18 too much load for any stock cylinder engine regardless of displacement. A power valve 850 with a good ignition may be able to pull it. I would make sure your nozzle is at least 85mm and pitch it down a little if needed. I will work great without too much work.

 

[Ronald Poitras]

hey where did you get those air boxes?

 

[freeride_motz]

So sorry all, lost my password for this and got locked out ‍♂️
I've run the 12/18 in my old JB1 with a bombed 701 and went really well. Always felt punchy but since building the pred (which is nearly 8kg heavier) with the 850 it feels ok but not totally amazing. I'm tempted to go the 11/17 hooker and see how it compares.

@Ronald Poitras they are Freeriderz Inc FiBoxes. Best thing I ever did for the carbs

 

[freeride_motz]

I missed the part about prop you had. I had originally typed 11/17 or 12/18. But You cannot compare a Solas 12/18 to a Hooker 11/17 and think they are just 1 degree different. The designs are different and while the numbers may be the near the same they can be worlds apart on what they will each do!. That said, how does your Solas feel, Do you feel like your punching a hole in the water (Too small of a pitch) or does it feel like it wont get going? (To tall of a pitch). Here is an example of the Hooker props. 9/15 for stock to mild,
10/16 for Mild (Pipe and Head) to Porting up to Big Bore 84/85mm with Porting,
11/17 Mod (Porting, Porting for Racing, High Compression Head, Larger Carbs ex 46-48mm 800cc motor, etc etc.............
12/18 would work for previous possibly,

When you look at prop pitches per mfg. Look at the range of each design.
Skat will have say a 7/12, 8/13, 9/14,10/15 or 11/17, 12/18, 13/19, 14/20
Solas 12/15, 13/16, 14/17, 15/18 or 14/18, 14.5/18.7, 15/19, 16/20

So, you can see there is a progession, the lower number in simple terms is for a stock motor, highest for a more build motor. You can take 2 props and they will both will work, one will typically have less bottom and more top, or vs versa on the other prop. Figuring out the right prop is just part of tuning and can be difficult. Brian at Torrent Pumps is really good at helping to pick prop pitches. Dave at IMPROS was good as well (He sold it to Glen Perry I believe), I do not know the new owner.
Hope this helps and did not confuse you.

Thanks for the info mate. I'm no guru at impeller pitch or carbs... 2 areas I have to work on gaining more knowledge with

 

[freeride_motz]

goes alright but want a bit more punch for the smaller days

 

[fastgtfairlane]

In my experience, solas impellers are heavier and load the pump and engine very hard. Especially at lower rpms. They are more of a top speed impeller. The skat or hooker impellers are much better for freestyle or freeride in my experience. Solas impellers always worked well on seadoos.

 

[Joe Superjet]

I just threw a hooker 9/15 in my superjet. Has a JM motor, not sure if big bore or not. But I have Pipe, head, enhancer etc. Romps on stock skis.

Do I need a gnarlier prop? I bought this one because it was reccomended, replaced a solas concord 12/16. Haven't tested it out yet

 

[Big Kahuna]

I just threw a hooker 9/15 in my superjet. Has a JM motor, not sure if big bore or not. But I have Pipe, head, enhancer etc. Romps on stock skis.

Do I need a gnarlier prop? I bought this one because it was reccomended, replaced a solas concord 12/16. Haven't tested it out yet

If you have a JM 735 you will be "ok", If you are running a JM Big Bore 754cc+ then you will need a 10/16 Hooker. I ran a 10/16 Hooker on an 84mm Big Bore and it was perfect. Later dropped back down to a 735cc and the 10/16 still worked great. I attempted to trade for a 9/15 and that was a Trainwreck, Got sent a prop that looked like it has been used in a rock grinding machine. Sold it, found another Hooker that needed some work and had IMPROS repair it and then repitch to a 9.5/15.5 I felt it could have been a little shallower for my setup. If I had to pick, I would go with 10/16.

 

[fastgtfairlane]

i have a friend with a v2 aquabot, lpw 62t 735, zeel, ltd chamber bpipe. dual 38s with solas mag pump, hooker 9/15 and bored nozzle i believe 1mm over. his ski definitely feels underpitched but still runs pretty good. he definitely could benefit from a 10/16. 9/15 worked great with the stock engine with head and pipe.

 

[freeride_motz]

I missed the part about prop you had. I had originally typed 11/17 or 12/18. But You cannot compare a Solas 12/18 to a Hooker 11/17 and think they are just 1 degree different. The designs are different and while the numbers may be the near the same they can be worlds apart on what they will each do!. That said, how does your Solas feel, Do you feel like your punching a hole in the water (Too small of a pitch) or does it feel like it wont get going? (To tall of a pitch). Here is an example of the Hooker props. 9/15 for stock to mild,
10/16 for Mild (Pipe and Head) to Porting up to Big Bore 84/85mm with Porting,
11/17 Mod (Porting, Porting for Racing, High Compression Head, Larger Carbs ex 46-48mm 800cc motor, etc etc.............
12/18 would work for previous possibly,

When you look at prop pitches per mfg. Look at the range of each design.
Skat will have say a 7/12, 8/13, 9/14,10/15 or 11/17, 12/18, 13/19, 14/20
Solas 12/15, 13/16, 14/17, 15/18 or 14/18, 14.5/18.7, 15/19, 16/20

So, you can see there is a progession, the lower number in simple terms is for a stock motor, highest for a more build motor. You can take 2 props and they will both will work, one will typically have less bottom and more top, or vs versa on the other prop. Figuring out the right prop is just part of tuning and can be difficult. Brian at Torrent Pumps is really good at helping to pick prop pitches. Dave at IMPROS was good as well (He sold it to Glen Perry I believe), I do not know the new owner.
Hope this helps and did not confuse you.

So a year on and I ended up buying a 148mm complete Solas pump. It came with a 13/19 (too long for my setup but wasn't in a position to buy a new impeller). I've emailed Glen at Impros and he is recommending a 10/16 for my 148mm pump. I realise the bigger pump means a slightly lower pitch would benefit it. I was heading down the track of a 11/17 but he has recommended the 10/16. Thoughts on that?
I've installed a 62t zeeltronics ignition too as well as custom annular discharge 46mm carbs from 2MK here in Aus. Hits hard even with the 13/19...

 

[long beach local]

In my SF Badass which is a very light ski used in the surf I have a 148 maxx setback pump with a 7/14 skat 5mm cutback impeller and it hits really hard off idle and pulls all I need. All with a mildly ported 701. I believe the biggest bang for your Buck is go low on the pitch the acceleration gains are Way more noticeable. Basically I bet Glen is spot on .