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View Full Version : How do I add more horsepower to my 1994 Mariner 115hp


overboardmarine
03-15-2008, 10:10 PM
I have a very healthy 1994 Mariner oil injected 115hp. I am looking to put it on a 1985 20' Advantage low profile hull. It is a nice sturdy boat which typically calls for 150-235hp. I'm okay with less speed from installing the 115 but are there any simple bolt on HP tricks that don't compromise reliability? I know sometimes changing jets in the carbs add a little HP. Are there any web sites out there that will calculate the hull's likely top speed with the 115hp?. Anybody have a 150-235hp Johnson/Evinrude big looper running powerhead? Please advise, thanks.
Maple Leaf
03-15-2008, 10:42 PM
I have a very healthy 1994 Mariner oil injected 115hp. I am looking to put it on a 1985 20' Advantage low profile hull. It is a nice sturdy boat which typically calls for 150-235hp. I'm okay with less speed from installing the 115 but are there any simple bolt on HP tricks that don't compromise reliability? I know sometimes changing jets in the carbs add a little HP. Are there any web sites out there that will calculate the hull's likely top speed with the 115hp?. Anybody have a 150-235hp Johnson/Evinrude big looper running powerhead? Please advise, thanks.

Leave it alone..........You would be better off just buying a Higher HP motor. With that 115 it will have to work ALOT harder on a 20ft boat that calls for a 150HP-235HP. It could cause Damage to the Power Head and would probely use More gas. I would find a smaller boat to but that 115 on or sell it to get a higher HP Motor
overboardmarine
03-15-2008, 10:51 PM
Alright Fieldzy. Your advice matches other trusted advice I'm getting. Appreciate it. Looks like I need to go find more horses.
Maple Leaf
03-15-2008, 10:55 PM
Alright Fieldzy. Your advice matches other trusted advice I'm getting. Appreciate it. Looks like I need to go find more horses.


And plus it would look kind of weird to have a 20ft Boat with a little 115:p
Cobra1racer
03-15-2008, 11:19 PM
http://www.bimsracingproducts.com/Nitrous%20Oxide.htm
150aintenuff
03-15-2008, 11:24 PM
ditch the 115 4 cyl..... they are junk get a v6
Maple Leaf
03-15-2008, 11:28 PM
http://www.bimsracingproducts.com/Nitrous%20Oxide.htm


Should go fast for about...............5 sec's:D Then KAAAA BAAMMMM:eek: