Hello!
Just spent the last few weeks getting our 1988 30 foot pontoon boat (23 inch pontoons) outfitted with a new transom so that we can have a brand new engine installed. The transom is rated for a 150hp engine and is 19 inches deep, designed for a regular long shaft engine.
Well, our dealership has the new engine on (65 horse etec pontoon series) but they are saying they can't get much past 1/4 throttle before it either cavitates or ventilates. I am thinking it ventilates because they are describing the issue as the transom is basically directing all the water away from the engine and gearcase. Almost seems like the transom is plowing water away from where it needs to be.
Modifying the transom seems a bit extreme to me. Multiple people are agreeing that the setup/height/location of the engine and transom are sound.
Other variable that isn't realistic right now is the boat is missing four to six hundred pounds of base equipment. Just a battery, steering console and fuel tank on the boat right now. While I understand getting the extra equipment on their could have some influence, I feel if we take delivery of the boat with new engine now, we are going to be fighting this for ages.
Pictures attached. Any suggestions? They are currently using an 11 pitch prop.
Just spent the last few weeks getting our 1988 30 foot pontoon boat (23 inch pontoons) outfitted with a new transom so that we can have a brand new engine installed. The transom is rated for a 150hp engine and is 19 inches deep, designed for a regular long shaft engine.
Well, our dealership has the new engine on (65 horse etec pontoon series) but they are saying they can't get much past 1/4 throttle before it either cavitates or ventilates. I am thinking it ventilates because they are describing the issue as the transom is basically directing all the water away from the engine and gearcase. Almost seems like the transom is plowing water away from where it needs to be.
Modifying the transom seems a bit extreme to me. Multiple people are agreeing that the setup/height/location of the engine and transom are sound.
Other variable that isn't realistic right now is the boat is missing four to six hundred pounds of base equipment. Just a battery, steering console and fuel tank on the boat right now. While I understand getting the extra equipment on their could have some influence, I feel if we take delivery of the boat with new engine now, we are going to be fighting this for ages.
Pictures attached. Any suggestions? They are currently using an 11 pitch prop.