07-20-2017, 07:37 PM
A lot of good information given here. Some things to keep in mind.
1) Almost every boat dealer will sell you undersized motors for your boat. It is a matter of cost, we want to spend less and the motor is the greater part of the boat, so cut the motor and cut the cost. If asked if the motor is big enough, they will either skirt the issue or flat out misrepresent the fact.
Sure, at lower elevations, they will be adequate, but I always suggest, a lesson I learned the hard way, that you get the biggest motor a boat is rated for.
2) With that large motor you can go from Sea Level to Strawberry and be OK without a prop change, but it will ever rev at Sea Level and you need to cut your speed while cruising or it will dog a bit at elevation.
3) Modern motors, which you have, adjust the fuel mix with their own on board computers, just like our cars and trucks do. It is the loss of HP and RPMs, and props are the easiest/only way to deal with the RPMs.
I have a way for you to pick your prop. If you enter the correct details it will give you several options that have worked well every time for me. And, like the others, I always kept two props on board. If one got damaged I could always change and get back to the dock, even if it did dog out or over rev.
[url "https://www.mercurymarine.com/en/us/propellers/selector/#/step-one"]https://www.mercurymarine.com/en/us/propellers/selector/#/step-one[/url]
Just fill out the information requested and it will even predict your max speeds.
[fishin]
[signature]
1) Almost every boat dealer will sell you undersized motors for your boat. It is a matter of cost, we want to spend less and the motor is the greater part of the boat, so cut the motor and cut the cost. If asked if the motor is big enough, they will either skirt the issue or flat out misrepresent the fact.
Sure, at lower elevations, they will be adequate, but I always suggest, a lesson I learned the hard way, that you get the biggest motor a boat is rated for.
2) With that large motor you can go from Sea Level to Strawberry and be OK without a prop change, but it will ever rev at Sea Level and you need to cut your speed while cruising or it will dog a bit at elevation.
3) Modern motors, which you have, adjust the fuel mix with their own on board computers, just like our cars and trucks do. It is the loss of HP and RPMs, and props are the easiest/only way to deal with the RPMs.
I have a way for you to pick your prop. If you enter the correct details it will give you several options that have worked well every time for me. And, like the others, I always kept two props on board. If one got damaged I could always change and get back to the dock, even if it did dog out or over rev.
[url "https://www.mercurymarine.com/en/us/propellers/selector/#/step-one"]https://www.mercurymarine.com/en/us/propellers/selector/#/step-one[/url]
Just fill out the information requested and it will even predict your max speeds.
[fishin]
[signature]