07-13-2012, 05:16 PM #1
I can haz cake AND eat it ? (14/23 prop on non ported engine dillema)
Been bouncing off the limiter (at 7200 rpm) with a 14/20 prop and rough water setup so I`m going to try a bigger prop .
Got a 14/23 Dynafly by impros which I`m going to bolt onto the shaft as soon as I find my solas prop tool.
I had a setup that was better suited for glass water - lake conditions but I`m going to try something different .
The setup for tomorrow is :
2006 gp1300R ski with bolt on engine mods : 4 degree keyway , milled heads, vf3 reeds , sonic booms
Hull :R&D 1200 grate , r&d jim ff plate (2 mm of shims under front bolts) , extended trim tabs (shims at hand), 87mm 3 degree exit nozzle
And the variables are : 2 degree pump wedge on/off ; exit nozzle - sho or r&d extended ; shims under tabs and plate.
Soo what would you say ?
Yay or nay to the prop and setup ?
Any tips , info ,advice and even personal opinions are appreciated.
07-13-2012, 05:21 PM #2
07-13-2012, 05:53 PM #3
People keep telling me 7200 is good but the damn thing will not go higher or lower. I have a trail tech tacho and it shows increments of 10 rpm but as soon as I go wot , all it ever shows is 7200 . Not 7210 or 7190 .
Bang , straight on the head 7200 rpm for as long as it`s wot. Even in the corners. I know what a limiter feels like, I can hear it when jumping waves and I don`t think 7200 is some kind of limit but what do I know ?
07-13-2012, 06:05 PM #4
I thought the limiter is at 7400. The 14/23 is way too big for your ski especially from impros. How do I know? Cause I had a 14/23 from impros. Im guessing you won't even turn 7000 rpms. Is the 14/20 bent by impros? If not I would have impros blueprint it and see where you stand from there. I've been down this same road. Before porting I had a 14/20 by impros and after porting I went with a 14/23 by impros for top end and a 15/23 by impros for holeshot.
07-15-2012, 07:59 AM #5
Quick update lake-side : ski runs great ! 7080 rpm at wot .
Dash was optimistic at 130 ish km/h
07-15-2012, 01:28 PM #6
Gps'd myself at 69.8 mph which is slower than what I managed with the 14/20 .
07-15-2012, 07:09 PM #7
I would say you would see a goin if it was a 14/21 maybe even a 14/22
07-16-2012, 08:52 AM #8
I`m sure I can squeeze some more rpms out of her if I do a little tweaking (shims under the plate, seal the pump, raise the sponsons,shim the trim tabs) .
The question is : should I up-pitch the 14/20 or down-pitch the 14/23 ?
07-20-2012, 10:18 AM #9
Pics of piston wash :
Let a friend take a ride on the gpr and he managed to sink it . Being scared that one of the hoses broke or popped off I took it apart . After finding everything was in order I concluded he subk it because of human error
07-20-2012, 12:39 PM #10
- Join Date
- Sep 2011
- Seattle, WA
How do you sink out of human error? Also run that engine this second for atleast an hour and or take it out and run it to avoid rusting the bearings.
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