How To Get More Power Out Of A 3.0 Mercruiser. Try something like a 30 pitch prop. The engine sucks in air and blows air out.
You will have spent just as much money as you might spend on a different rig; Any other attempts at performace mods to the industrial engine that is the merc 3.0 are spitting in the wind. Salt or fresh, closed cooling vs raw water cooling make a big difference.
Other option would be to get a very large pitch prop that will push you a lot faster at idle which will increase your mpg. Any other attempts at performace mods to the industrial engine that is the merc 3.0 are spitting in the wind. The specifications of a 3.0 mercruiser.
And then it is likely that your rig will not be as reliable as you might like. At this time mercruiser redesigned the exhaust manifold and eliminated the one piece manifold with cast end caps and replaced it with a single manifold design p/n 806867 that was produced in two different version to be used on the 3.0l lx engine models going forward as well as replacing the older 3.0l l engine models for field service replacement purposes. Mercury racing & mercury marine models we tune.
The long block can also be. Easy to do.pull drive, yank engine, etc, drop in sbc (zz4 crate are great. If this process is hindered, then performance is lost.
What's the best way to get more power out of my 3.0? Your best solution is to buy a different rig with a larger motor. Mercury quicksilver will soon be offering the 3.0l as a 100% new engine that mercury has tooled and plans to offer as a long block, crate engine, and complete engine.
Clean the air intake thoroughly. They are around the same hp it matters if one has a 4 blade or 3 blade prop, the 4 blade will pull on plane quicker, that is good for rough seas and pulling(skiing wakeboarding and tubing) a 3 blade will get a higher speed but will be a little slower on plane an inboard is almost like a car motor and easy to fix by a novice an outboard will need special tools to fix things. I have a 5.0 with 775 hours still runs good.