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ContinuousWave: Whaler Performance
Prop for 22 revenge
|Author||Topic: Prop for 22 revenge|
posted 11-11-2001 06:17 PM ET (US)
I have a 22 W/T. The engine is a 225 Johnson. My 15x17 prop gives me about 37 mph yet only gets me about 4900 rpms with a relatively light load. The engine is a 1987 so I believe the max rpm is 5500 maybe 6000. I also tried a 14&1/2 by 19 and only got 37mph at 4700 rpms. Does anybody know which aluminum prop would get me more rpms.
posted 11-11-2001 08:06 PM ET (US)
swede- I run a older 225 Johnson on a 22' Outrage with a 14 1/2 x 19. It turns 5200 rpms no prob. Sweet spot at 38/4000 for plane. If this baseline helps great. David
posted 11-11-2001 08:33 PM ET (US)
swede- I'm running stainless and the tach may not be perfect. Never pushed it far beyond 5200 for fears it would blow up, I'm delicate about the Miss Amanda Ann/ David
posted 11-12-2001 09:37 AM ET (US)
Dave, thanks for the response. I may look into it alittle further. I agree that I should not necessarily may out on the rpms. Yet I'm curious as to why your getting 5200 from the same prop I'm getting 4700. (big difference). Thanks.
posted 11-12-2001 09:40 AM ET (US)
Whoops! Max not May.
posted 11-12-2001 08:20 PM ET (US)
For general comparison, my 2000 225 Yamaha turns a 15 x 17 to 5300 rpms achieving a top speed of about 44 mph. So I would guess that your 15 x 17 is the right size, at least for a fresh 225. Since you are not achieving WOT rpms at WOT, it sounds like you may have a motor issue. Check your fuel line connections to make sure they are all tight. If you have a fuel filter/water separator, make sure its clean. If the connections are tight and the filter is clean, there could be a line obstruction.
Also, one bad spark plug could cause rpm loss but might be a bit hard to notice. A bad coil could also be a culprit.
As a quick inexpensive check, I'd try changing out all the plugs to new plugs to see if that restores the rpms.
posted 11-17-2001 01:33 AM ET (US)
Peter, I took your advice and changed plugs and plug wires. I had previously changed the water seperator. I also had the aluminum prop (15x17) re-hubbed as I had spun it. I went out yesterday and got 5300-5350 rpms and 41 mph on gps. I imagine that's as good as it gets and therefore I'm more than satisfied. Question! Have you tried stainless steel prop. If so what were the results. Thanks.
posted 11-17-2001 02:16 PM ET (US)
I think you're in the ball park for WOT and top end. I think your target is about 5500 RPM. Tachs are probably not more accurate than 100 to 200 rpms. Sounds like you might have had a bad plug, wire or both. So, I think with an older engine you can consider that that what you're getting is about as good as it gets.
My Yamaha is turning a stainless so a stainless steel prop might get you one or two mph at the same RPM but that would be about it.
posted 11-25-2001 04:25 PM ET (US)
Swede5 - I have a 1990 Revenge 22 W/T with a 1990 225 Johnson (314 hours) and 15x17 stainless prop = 44 mph pitot tube (38+ kts GPS) at 5,600 RPM. I've been getting this for the last 5 seasons. JimP
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