1995 Outrage 24 Engine Mounting Height
Posted: Thu Jul 11, 2019 12:34 am
A 1995 Outrage 24 has a 2003 Yamaha 250 HPDI 30-inch-shaft engine. The engine is mounted at the lowest mounting position available. The person I bought the outboard from insisted on it being mounted as low as possible.
Using a straight edge to get the measurement, and with the [anti-ventilation] plate trimmed parallel to the hull bottom pad, the plate is 3-inches below the boat bottom;
I am borrowing a engine hoist and will lift up the outboard.
Four sets of mounting holes are available. If I understand correctly the vertical separation is 3/4-inch for each hole set.
By this math it seems like this Yamaha is very long for this boat.
The bottom of the hull is a rounded pad not a sharp Vee.
Q1: Should I move up the engine two holes (1-1/2-inch) making the [anti-ventilation] plate about 1-1/2-inch under the bottom?
Q2: Should I instead move up the engine three-holes making it at its highest position and putting the cavitation plate about 3/4-inch below the boat?
Q3: For anyone with c.1995 OUTRAGE 24 with a single (Yamaha) [30-inch shaft]engine: what is the engine mounting height?
Maybe I am measuring something wrong. Once I go to move the outboard I will measure it again to make sure.
My thoughts are that this is a heavy boat and is designed to make the outboard run deep and maybe I should embrace this fact and let it run deep and move the engine [to be mounted at two-holes up].
The propeller is a four-bladed aluminum Mercury-style 17-pItch. Top boat speed is 37- MPH at engine speed of 5,500-RPM. I am running this propeller as I add hours to the engine after the rebuild two-years ago. I am planning to put on a MIRAGE 17 propeller. I have MIRAGE 19. I plan to test propellers after I move up the engine mounting height.
The engine gear case is very deep while running, and I know the engine mounting height needs to come up.
This 2003 Yamaha 250 HPDI engine seems to be running very strong. I think the current [aluminum four-blade “Mercury-style 17-pitch] 14-1/2-inch diameter propeller is too small diameter, giving me poor efficiency.
The Mirage is 15-inch diameter and will be much better. Again, I have been using this [aluminum four-blade “Mercury-style 17-pitch] propeller to make it easier on the engine during break-in after the rebuild.
I really would like to move the engine mounting height once and be done.
Thanks for any help with this.
Archie
Using a straight edge to get the measurement, and with the [anti-ventilation] plate trimmed parallel to the hull bottom pad, the plate is 3-inches below the boat bottom;
I am borrowing a engine hoist and will lift up the outboard.
Four sets of mounting holes are available. If I understand correctly the vertical separation is 3/4-inch for each hole set.
By this math it seems like this Yamaha is very long for this boat.
The bottom of the hull is a rounded pad not a sharp Vee.
Q1: Should I move up the engine two holes (1-1/2-inch) making the [anti-ventilation] plate about 1-1/2-inch under the bottom?
Q2: Should I instead move up the engine three-holes making it at its highest position and putting the cavitation plate about 3/4-inch below the boat?
Q3: For anyone with c.1995 OUTRAGE 24 with a single (Yamaha) [30-inch shaft]engine: what is the engine mounting height?
Maybe I am measuring something wrong. Once I go to move the outboard I will measure it again to make sure.
My thoughts are that this is a heavy boat and is designed to make the outboard run deep and maybe I should embrace this fact and let it run deep and move the engine [to be mounted at two-holes up].
The propeller is a four-bladed aluminum Mercury-style 17-pItch. Top boat speed is 37- MPH at engine speed of 5,500-RPM. I am running this propeller as I add hours to the engine after the rebuild two-years ago. I am planning to put on a MIRAGE 17 propeller. I have MIRAGE 19. I plan to test propellers after I move up the engine mounting height.
The engine gear case is very deep while running, and I know the engine mounting height needs to come up.
This 2003 Yamaha 250 HPDI engine seems to be running very strong. I think the current [aluminum four-blade “Mercury-style 17-pitch] 14-1/2-inch diameter propeller is too small diameter, giving me poor efficiency.
The Mirage is 15-inch diameter and will be much better. Again, I have been using this [aluminum four-blade “Mercury-style 17-pitch] propeller to make it easier on the engine during break-in after the rebuild.
I really would like to move the engine mounting height once and be done.
Thanks for any help with this.
Archie