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PostPosted: 05 Aug 2016, 23:42 

Joined: 24 Dec 2011, 22:06
Posts: 910
Location: 72032
scoobeb wrote:
By the way it pushed my 1648 flat bottom alumacraft with over 1000lbs weight 32.4mph gps with a 12 pitch prop,that is pretty impressive.It was a flat calm day on the lake to so no wind,etc...Like i said i was a stupid dummy for getting rid of it.I love my merc,but once i sell it,suzuki 25hp all the way.Just imo.


So, it was running 6600+ RPM? I did not know that they'd run that hard.


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PostPosted: 06 Aug 2016, 09:48 

Joined: 29 Aug 2011, 04:59
Posts: 875
I don't know what rpm it was running,all i know is it was doing 32mph,gps by the way.


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PostPosted: 06 Aug 2016, 09:52 

Joined: 29 Aug 2011, 04:59
Posts: 875
Have you ever ran one on a flat bottom boat?The 25hp suzuki has insane power,i used a bigger prop so no the rpms would go down not up but i'm sure you knew that already.I had a 20hp 4stroke suzuki and on my 1648 with the same weight i ran close to 28mph with a 11 pitch prop so how would an extra 4mph not be possible in your eyes with a much more powerful outboard???????????????


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PostPosted: 07 Aug 2016, 08:08 

Joined: 20 Jul 2016, 10:51
Posts: 36
That's awesome, so I'm guessing a 1648 is 16' long right?


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PostPosted: 08 Aug 2016, 03:29 

Joined: 29 Aug 2011, 04:59
Posts: 875
Yes,16ft.I have had some really great success with outboards being so powerful.I now have a 1993 20hp 2stroke mercury that has insane power also.It runs 30.7mph with just me in the boat with a 13 pitch prop.The 20hp suzuki has incredible power also for it's size and only 97lbs which is impressive but it is a big difference from the 25hp suzuki.I have had both and they both ran i mean like beasts for their size.If you went with a 20hp suzuki you would not be losing to much over the 25hp you have now,maybe a couple mph but think of how much fuel you will save and oil.They both i mean sip gas.


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PostPosted: 08 Aug 2016, 03:32 

Joined: 29 Aug 2011, 04:59
Posts: 875
Remember it takes very little to move a flat bottom jon boat so the 20 or 25hp will make it scream.


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PostPosted: 08 Aug 2016, 08:06 

Joined: 24 Dec 2011, 22:06
Posts: 910
Location: 72032
Most aluminum hulls have a LOT more drag that most people think. The ribs on the bottom are designed to help "stick" it to the water. That said, there are about 4 or 5 (that I know of) manufacturers that build "performance" aluminum hulls, built to handle decent and run faster than most ordinary aluminum boats.


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PostPosted: 08 Aug 2016, 08:32 

Joined: 30 Jan 2016, 11:00
Posts: 66
Location: Central Florida
Guy here at work went from a 115hp 2 stroke to a brand new 140 hp Suzuki 4 stroke on his 18-20 ft bay boat and lost top end speed (2mph) and hole shot performance. He's still working on propping it, but hasn't had much luck.


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PostPosted: 08 Aug 2016, 09:01 

Joined: 20 Jul 2016, 10:51
Posts: 36
scoobeb wrote:
Yes,16ft.I have had some really great success with outboards being so powerful.I now have a 1993 20hp 2stroke mercury that has insane power also.It runs 30.7mph with just me in the boat with a 13 pitch prop.The 20hp suzuki has incredible power also for it's size and only 97lbs which is impressive but it is a big difference from the 25hp suzuki.I have had both and they both ran i mean like beasts for their size.If you went with a 20hp suzuki you would not be losing to much over the 25hp you have now,maybe a couple mph but think of how much fuel you will save and oil.They both i mean sip gas.


Right on, I think I'll end up with the 25hp. Currently I have a 16' Jon boat with a 97 25hp Evinrude and it will push about 30mph. I just want to stay where I'm at, I didn't want to buy a new motor then end up slower. The motor is a champ really, not sure what prop is on there but I'm sure it's dinged up and whatnot.

Only reason I'm really looking to change is my dad wants a newer 4-stroke to be quieter and less smokey lol.


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