I am with my Father putting new sails and motor on our Mariner. We can not agree on the the minum 6 hp or a(me)a more efficient 9.9
out board mortor
- Thread starter John Lester
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motor
I used a 6hp Honda on my O'Day 22 and it worked fine. Not sure what a few extra HP will give you except more weight and expense.
I used a 6hp Honda on my O'Day 22 and it worked fine. Not sure what a few extra HP will give you except more weight and expense.
mariner outboard
When I bought my 72 Mariner 2+2 three years ago it came with a Nissan 3.5 HP. I have never had the motor runing wide open to move the Mariner up or down the Wareham river or out in Buzzards Bay. It think the 9.9 is overkill and too much weight for the transom.
When I bought my 72 Mariner 2+2 three years ago it came with a Nissan 3.5 HP. I have never had the motor runing wide open to move the Mariner up or down the Wareham river or out in Buzzards Bay. It think the 9.9 is overkill and too much weight for the transom.
- Jan 22, 2008
- 519
Even with the bigger motor you cannot exceed hull speed
The general quideline for powering is 2hp for every 1000# of displacement so for 2283# of your boat the most you need is 4.5 hp. You are just burning more gas and spinning your prop with anything larger. Additionally, as mentioned, you are adding unnecessary weight to the boat's transom, slowing it down even more. Your theoretical top hull speed is 6.3 knots The only other reason (and its an expensive one) to get a larger motor is for the potential increase in electrical generation for the battery bank, assuming your electrical needs on a 22 are large enough to warrant more output from the generator. Even the 6hp should be enough to manage increased power for tides, currents, and powering into strong headwinds.
The general quideline for powering is 2hp for every 1000# of displacement so for 2283# of your boat the most you need is 4.5 hp. You are just burning more gas and spinning your prop with anything larger. Additionally, as mentioned, you are adding unnecessary weight to the boat's transom, slowing it down even more. Your theoretical top hull speed is 6.3 knots The only other reason (and its an expensive one) to get a larger motor is for the potential increase in electrical generation for the battery bank, assuming your electrical needs on a 22 are large enough to warrant more output from the generator. Even the 6hp should be enough to manage increased power for tides, currents, and powering into strong headwinds.
9.9 too big
A 9.9 is way too big for a Mariner. I have an 8 hp on my Oday 23, a considerably heavier and larger boat than the Mariner. I sail in LIS, which has some significant tidal flows, and I almost never have to go to full throttle. A 9.9 on a Mariner is just a waste of weight, gas and pollution. Also, if you are buying a new engine, you will be buying a four stroke (they don't make small two strokes anymore). A 9.9 four stroke is not only heavier than its two stroke cousin, it also generates more low-end torque, which means it is more efficient at moving slow, heavy boats like sailboats. A low horsepower 4 stroke like a 4 or 6 would be plenty of power for a Mariner. Don't forget to upgrade your mounting bracket too. The OEM mounting brackets on Odays were made for two strokes, not four strokes. Remember, its not just the weight of the engine you must take into consideration when choosing a bracket. The new brackets are specifically designed to handle the stresses of a four stroke.
A 9.9 is way too big for a Mariner. I have an 8 hp on my Oday 23, a considerably heavier and larger boat than the Mariner. I sail in LIS, which has some significant tidal flows, and I almost never have to go to full throttle. A 9.9 on a Mariner is just a waste of weight, gas and pollution. Also, if you are buying a new engine, you will be buying a four stroke (they don't make small two strokes anymore). A 9.9 four stroke is not only heavier than its two stroke cousin, it also generates more low-end torque, which means it is more efficient at moving slow, heavy boats like sailboats. A low horsepower 4 stroke like a 4 or 6 would be plenty of power for a Mariner. Don't forget to upgrade your mounting bracket too. The OEM mounting brackets on Odays were made for two strokes, not four strokes. Remember, its not just the weight of the engine you must take into consideration when choosing a bracket. The new brackets are specifically designed to handle the stresses of a four stroke.
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