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No Skat-Trak for the 1998 Speedster?
- Thread starter cdnjaguar
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I just looked at a pdf I have from Dennis Kirk, and I don`t see anything listed, but there is a solas 16\24 listed...
what pitch is in the boat now? what part number in on the oem impellers?
Guest_User
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I googled the part number and have been scrolling thru the lists, so far I found a german link stating> . Impeller 271000816 140 mm 16-25 ...
but I can not confirm if this is the true pitch...
Dr Honda
Well-Known Member
The first number is the pitch at the leading edge... and the second number is the trailing edge.
BUT... the pitch isn't the entire story. The hub design plays a big part in how the water is transported through the pump. So, you can't compare the OEM pitch to an aftermarket pitch.
You may want to send an email to Skat-Trak to see if they have an updated recommendation.
****EDIT******
It's the 16.5' boat with twin 800's... right?
If that's the case... I would probably say to use the same impellers as a GTX or 800 XP.
BUT... the pitch isn't the entire story. The hub design plays a big part in how the water is transported through the pump. So, you can't compare the OEM pitch to an aftermarket pitch.
You may want to send an email to Skat-Trak to see if they have an updated recommendation.
****EDIT******
It's the 16.5' boat with twin 800's... right?
If that's the case... I would probably say to use the same impellers as a GTX or 800 XP.
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Guest_User
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To add what the DR. said, you also have to be careful not to go to much one way or the other. To small of a leading edge will blaze the prop out of the hole, and to large on the trailing will lug the engines down. Another reason why the OEM`s are a good "compromise".
More importantly after market impellers are far more efficient than OEM`s, also depending on the OEM manufacturer as well...
In the ski`s I`ve also used Skat for short acceleration, tight turning and close water conditions, as they tend to run out sooner with less top end mph, but get you from turn to turn quickly.
I`ve run the solas for more open water where faster cruising speeds are constant for a longer range, but they aren`t as tight down low.
All these impellers can be tweeked, "kicking" the trailing edge for + or - rpm`s. and also the leading edge for conditions.
Hub designs are what gives these impellers different characteristics. Yamaha had a small hub pump, early design, and switched to a large hub pump and impeller when the 1300 arrived. currently there are many known great combinations that work depending on what you want to achieve and what mods support the overall torque so the machine has the ability to turn a steeper pitch...
fundamentally, using the OEM pitch numbers are a starting point. discussing what your needs are with the impeller company is key...
Do this long enough and you`ll get to distinguish how each impeller "feels" and what to expect without any guess work...
good luck!...
More importantly after market impellers are far more efficient than OEM`s, also depending on the OEM manufacturer as well...
In the ski`s I`ve also used Skat for short acceleration, tight turning and close water conditions, as they tend to run out sooner with less top end mph, but get you from turn to turn quickly.
I`ve run the solas for more open water where faster cruising speeds are constant for a longer range, but they aren`t as tight down low.
All these impellers can be tweeked, "kicking" the trailing edge for + or - rpm`s. and also the leading edge for conditions.
Hub designs are what gives these impellers different characteristics. Yamaha had a small hub pump, early design, and switched to a large hub pump and impeller when the 1300 arrived. currently there are many known great combinations that work depending on what you want to achieve and what mods support the overall torque so the machine has the ability to turn a steeper pitch...
fundamentally, using the OEM pitch numbers are a starting point. discussing what your needs are with the impeller company is key...
Do this long enough and you`ll get to distinguish how each impeller "feels" and what to expect without any guess work...
good luck!...
cdnjaguar
New Member
Thanks guys! Yes this boat is 16.5' and has twin 800's
I spoke with Skat Trak today and they recommended the SS4075SW1622. It's from their 140-75 Swirl line and has a pitch of 16-22 and a 75mm hub. They were saying that this will outperform the OEM impeller with better towing, hole shot/acceleration, won't lower the top speed I'm currently getting and can help reduce the possibility of cavitation! now if it will only cook me breakfast, we'll be good to go.... Apparently it should have been updated in their application chart, but must have gotten overlooked. So, needless to say I'll be placing my order and should see them shortly. I will let you all know how they work out.
Thanks for the input guys!
I spoke with Skat Trak today and they recommended the SS4075SW1622. It's from their 140-75 Swirl line and has a pitch of 16-22 and a 75mm hub. They were saying that this will outperform the OEM impeller with better towing, hole shot/acceleration, won't lower the top speed I'm currently getting and can help reduce the possibility of cavitation! now if it will only cook me breakfast, we'll be good to go.... Apparently it should have been updated in their application chart, but must have gotten overlooked. So, needless to say I'll be placing my order and should see them shortly. I will let you all know how they work out.
Thanks for the input guys!
Guest_User
New Member
Awesome! can`t wait to hear the results!:cheers:
cdnjaguar
New Member
Me neither! Lol
I got them on order with watercraft Werks out of CA, as I couldnt find a distributor in Canada and these guys had a good price on them. Apparently these Skat Traks are a made to order item, so W.W. should see them in a week or two, then 3-6 days later they should be showing up with new wear rings and an impeller tool. So stoked right now, Christmas is coming early this year!! Lol
Thinking about ordering a bearing/seal kit for each pump as well since I'm going to have them apart...... Then I know these pumps will be good as new... If not better lol
I got them on order with watercraft Werks out of CA, as I couldnt find a distributor in Canada and these guys had a good price on them. Apparently these Skat Traks are a made to order item, so W.W. should see them in a week or two, then 3-6 days later they should be showing up with new wear rings and an impeller tool. So stoked right now, Christmas is coming early this year!! Lol
Thinking about ordering a bearing/seal kit for each pump as well since I'm going to have them apart...... Then I know these pumps will be good as new... If not better lol
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What kind of price did you find for them? Ive thought about upgrading. I noticed some minor cavitation when i had the boat out last week, so over the winter ill throw in new wear rings and either refurb these impellers or upgrade.
I have been running exactly what you ordered, 140-75 swirls 16/22, on my 98 speedster for the last two years. For towing applications its a great set up. On the plus side, these things really grab the water much better than the OEM. No more cavitation on the port side when making starboard turns, gets big tubes and heavier skiers up easier, and the mid range feels snappier. The down side, I lost a couple MPH on the top end, 53 vs 51 MPH according to GPS. Also if you try to "sport" ride and spin the boat out its much more difficult as the swirls really seems to suck the boat tight to the water. For me the trade offs were well worth it as 90% of my running hours I am pulling something.
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