Thread: 5131092 impeller on a 750?
06-06-2011, 10:53 AM #1
5131092 impeller on a 750?
I acquired a pile of parts from a neighbor (including the '93 SL hull) and found a Polaris 5131092 impeller. I didn't see that impeller part# in the manual I have, so I did a search and found Keddano talking about this number being a progressive 8X20 impeller. From what I gathered it should pull like a monster out of the hole with the shallow 8 pitch but will take a good bit of HP to pull the top end with the 20 pitch.
My '94SLT750 is going to be my mod machine. I already have the TDR water box and plan to soon install the PSI dry pipe (with necessary jetting changes). I also have reed spacers and stuffers that I'm going to install while I have the carbs removed. Ocean Pro Vortex F/A's are already on so it's breathing as well as it can.
So, my question is will those be enough changes for the 750 to pull that -092 impeller? I also have a 5131079 impeller, which was stock for the SL hulls and should be slightly taller than the -035 I have on the ski now. I thought I would try the -079 first after the pipe install hoping it will put my top RPM where it needs to be. But if it doesn't I'm curious if the -092 will do the trick.
Lemme hear your opinions.
06-06-2011, 11:48 AM #2
The HP-1 "kit" # 2871286, available for the 900's (suggested 95-110hp) consisted of the 5131092 impeller and instruction sheet
It's recommended to use a "low" pitch or familiar impeller,when tuning carbs for mods ( to remove that variable from tuning)
After it's tuned properly -try impellers
06-06-2011, 01:04 PM #3
I figured to start with the PSI dry pipe and stock impeller to see if I hit the rev limiter. If I do hit the limit I was going to install the -079 SL prop. Then, if I'm still on the top end of RPM I was going to try the -092. I recall XLint89 stating he saw documentation from PSI claiming a 6HP gain with the dry pipe. I'm thinking with the pipe and the other mods it might push in the realm of 10HP to 12HP. I'm not sure that's really going to be enough grunt to turn that prop on the top end, but we'll see.
06-06-2011, 08:40 PM #4
- Join Date
- Oct 2006
- Cleveland OH
They do recommend going up 1 pitch with the dry pipe. BUT, I would run the 079 and see where you're at.
The 079 is roughly a 13/18 pitch with the 035 being closer to a 12/17
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