Sure is quiet in here....do I need to start a fight?

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Cantdog said:
You'll probably find the your boat behaves considerably different with a stainless prop, even of the exact same diameter and pitch, especially at or near WOT. Aluminum props work well and are relatively inexpensive but lose a certain amount of cup and pitch as power increases......literally "Flattening" out the blades and becoming less efficient at speed. Stainless props maintain their shape and deliver numbers much closer to the stated ones on the prop when under a heavy load......
Click to expand...

That is interesting........metals flow and flex. More than most think.
 
Cantdog said:
Hope it works out for you....pretty spendy.....did you stay with the same dia. and pitch?
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Yes, since it was the boats first run I left the aluminum prop on for this trip, I will put the stainless one on for next trip and check speed against engine RPM, if the remain close to the same all will be good. I have been told to expect a slight increase in speed at the same RPM due to the less flexing of the props blades. Spendy and shiny, just have fingers crossed that it works well.
 
Installed the new starting battery, set the choke and the engine started on the first click of the key, first start up since last fall. I had fogged the engine plus put a shot of two stroke oil in each cylinder for over wintering, always do that to any engine that will set unstarted over the winter.
 
pioneerguy600 said:
Yes, since it was the boats first run I left the aluminum prop on for this trip, I will put the stainless one on for next trip and check speed against engine RPM, if the remain close to the same all will be good. I have been told to expect a slight increase in speed at the same RPM due to the less flexing of the props blades. Spendy and shiny, just have fingers crossed that it works well.
Click to expand...

Should be good....just hope it isn't so aggressive as to not allow your engine to spool up into the WOT spec for that engine...Bayliner is pretty light and smooth so probably just go faster.....I know when I was trying to get the Seaway propped up correctly after the new engine install, each change lowered the RPM and upped the top speed......I started with a 15 square.....34 mph...over revved badly.....went to a 15 X 17.....over revved almost as bad...36 mph....tried a 15 X 19....would stay off the rev limiter heading into the wind but would hit it running down wind...38 mph.....choices were getting slim.....the next size was 14.8 X 21......really needed to get the rpm down to hopefully mid spec.....hummed and hawed....checked the sporran.....fussed some more and finally doing a bunch of math I decided to go with the 14.8 X 21 in stainless....wasn't sure the alum would had done it......thing is...once you get to these numbers your choices get very limited and the props from there on get much smaller in diameter and a lot steeper in pitch and the Seaway has always responded better with a larger dia prop. In the end the 14.8 X 21 stainless did the trick....WOT spec on the Vortex 4.3 is 4400 to 4800...the 14.8 X 21 pushed us at an even 42MPH @ 4600 WOT.......perfect...but I went through 5 prop changes to get there.
 
Cantdog said:
Should be good....just hope it isn't so aggressive as to not allow your engine to spool up into the WOT spec for that engine...Bayliner is pretty light and smooth so probably just go faster.....I know when I was trying to get the Seaway propped up correctly after the new engine install, each change lowered the RPM and upped the top speed......I started with a 15 square.....34 mph...over revved badly.....went to a 15 X 17.....over revved almost as bad...36 mph....tried a 15 X 19....would stay off the rev limiter heading into the wind but would hit it running down wind...38 mph.....choices were getting slim.....the next size was 14.8 X 21......really needed to get the rpm down to hopefully mid spec.....hummed and hawed....checked the sporran.....fussed some more and finally doing a bunch of math I decided to go with the 14.8 X 21 in stainless....wasn't sure the alum would had done it......thing is...once you get to these numbers your choices get very limited and the props from there on get much smaller in diameter and a lot steeper in pitch and the Seaway has always responded better with a larger dia prop. In the end the 14.8 X 21 stainless did the trick....WOT spec on the Vortex 4.3 is 4400 to 4800...the 14.8 X 21 pushed us at an even 42MPH @ 4600 WOT.......perfect...but I went through 5 prop changes to get there.
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You should hear the stories dad tells of proping boats in the 60s as outboards were coming into their own. Lots of good tales on owner "adjustments".
 
Jimmy in NC said:
You should hear the stories dad tells of proping boats in the 60s as outboards were coming into their own. Lots of good tales on owner "adjustments".
Click to expand...
Robin remember the old outboards with adjustments straight out the front to tweak rich or lean?

Apparently they got so tired of people messing with carb tune they'd lock the jets with a jam nut and loosen the handle friction. Dad said it was hilarious to have someone come in with handles all over the place instead of the 12:00 position they left them in and the owner going on about how much better they ran now. In reality they had changed nothing.
 
Going to do something I never thought I would do today...going to recommend a Stihl saw over a Husky.

Got a call from someone wanting a big saw to run a 42" bar. I told them I had such an animal with a 42... but the more I think about it I do not think a 42" .404 on the 394 everyday is a good idea. That is really 120cc territory and IMHO the MS880 is better than the 3120xp currently.

If he insists on the saw I will take his money.... but I will try to steer him to something more sized to the job.
 
Jimmy in NC said:
Robin remember the old outboards with adjustments straight out the front to tweak rich or lean?

Apparently they got so tired of people messing with carb tune they'd lock the jets with a jam nut and loosen the handle friction. Dad said it was hilarious to have someone come in with handles all over the place instead of the 12:00 position they left them in and the owner going on about how much better they ran now. In reality they had changed nothing.
Click to expand...

HaHaHa!!!! That's a good one!!!!!
 
Cantdog said:
Should be good....just hope it isn't so aggressive as to not allow your engine to spool up into the WOT spec for that engine...Bayliner is pretty light and smooth so probably just go faster.....I know when I was trying to get the Seaway propped up correctly after the new engine install, each change lowered the RPM and upped the top speed......I started with a 15 square.....34 mph...over revved badly.....went to a 15 X 17.....over revved almost as bad...36 mph....tried a 15 X 19....would stay off the rev limiter heading into the wind but would hit it running down wind...38 mph.....choices were getting slim.....the next size was 14.8 X 21......really needed to get the rpm down to hopefully mid spec.....hummed and hawed....checked the sporran.....fussed some more and finally doing a bunch of math I decided to go with the 14.8 X 21 in stainless....wasn't sure the alum would had done it......thing is...once you get to these numbers your choices get very limited and the props from there on get much smaller in diameter and a lot steeper in pitch and the Seaway has always responded better with a larger dia prop. In the end the 14.8 X 21 stainless did the trick....WOT spec on the Vortex 4.3 is 4400 to 4800...the 14.8 X 21 pushed us at an even 42MPH @ 4600 WOT.......perfect...but I went through 5 prop changes to get there.
Click to expand...

I can over rev the engine with the aluminum prop that is on it now, I seldom run over 2/3 throttle now. The stainless prop should load the engine a bit more, may even hold er to run WOT and not over rev. The 2.3 is designed to run up to 6,000 but I only run it around 4, 000, + or -.
 

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