E-TEC 60: Engine Mounting Height Leads to Porpoising

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Author Topic:   E-TEC 60: Engine Mounting Height Leads to Porpoising

gabollini posted 06-13-2008 05:05 PM ET (US)
[I] have had my [Evinrude E-TEC 60-HP motor] for about two months, and [I am] enjoying the gas consumption. [I] had [my Evinrude E-TEC 60-HP motor] in Florida for a week solid and only blew through two tanks of gas. Oil consumption was also incredible. Like many have stated, [my Evinrude E-TEC 60-HP motor] was a little smoky due to oiling during break-in period, but after a while [my Evinrude E-TEC 60-HP motor] didn't smoke at all and purred like a kitten at idle. My only disappointment is [acceleration from a standing stop]. With a 13x19 pitch aluminum proppeller my top [engine speed] is about 5,100-RPM with two people aboard. [I] tried a 17-inch pitch [propeller]. Now my [acceleration from a standing start] is greatly improved, as well as throttle response, but [I] notice that my [engine speed] approaches almost 6.000-RPM with two aboard. Since [the maximum engine speed] for this [Evinrude E-TEC 60-HP motor] is 5,750-RPM, I'm inclined just to back off the throttle and settle with the 17-inch pitch propeller for water sports, then just use the 19-inch pitch propeller for cruising and fishing. I also notice that when using the 17-inch pitch propeller porpoising is common, unless [the Evinrude E-TEC 60-HP motor is] trimmed almost all the way down. I was thinking about putting one of those anti-porpoise fins on the lower unit to help out. Did my dealer put the [Evinrude E-TEC 60-HP motor] too low or too high? Any input appreciated. Thanks,
jimh posted 06-13-2008 08:17 PM ET (US)
What is the current engine mounting height? What kind of boat is it mounted on?
jimh posted 06-13-2008 08:20 PM ET (US)
[This article was posted in duplicate but the duplicate article has been removed.]
gabollini posted 06-13-2008 10:44 PM ET (US)
the motor is on a ss 15. Not sure how to measure the mounting height, but I know it's the 2nd from the top hole on the top. The mount for the bottom don't have holes. Seems like the motor sits lower in the water than my old suzuki 65. I'm not sure if that's because it's about 20# heavier or what. gabe
Jefecinco posted 06-14-2008 09:16 AM ET (US)
Changing mounting height is easy and it's something you can do at no cost. On our small Whalers weight distribution can also affect performance significantly. The proper propeller is also key to good performance and handling.
Hydrofoils may be useful if after doing all else fails to accomplish your goals. I recommend trying for the perfect propeller and mounting height before mounting a hydrofoil.
Butch
mikemdd posted 06-16-2008 02:06 PM ET (US)
As a reference point, if porposing is a problem with the engine trimmed all the way in, will raising the engine make the problem worse or better?
Mike
2manyboats posted 06-16-2008 10:43 PM ET (US)
The operating range for the 60 E-TEC is 5500 to 6000 rpms and 5750 is where you get 60hp. My 60 is on a Montauk and I am one hole from the highest mounting and am propped to turn 6000 rpm with a light load.
Jefecinco posted 06-17-2008 09:15 AM ET (US)
Mike,
Porpoising is normally experienced with the engine trimmed to or near the outermost limit for operation. Trimming the engine fully in tends to make the boat go very slowly even at WOT. In my experience it also makes the boat difficult to steer.
When I raised my engine one hole from the dealer's initial setting it improved performance BUT it made the boat slightly more apt to porpoise when the engine is fully trimmed out. This is especially true when crossing old wakes which have flattened out. When I get porpoising I simply bump the trim switch once or twice to stop the movement.
Typical operation for me from a standing start is to trim the engine in to a near vertcal position, advance to full throttle, immediately begin trimming the engine out while watching the trim gage, stop trimming when the gage indicates it is trimmed to my preference, throttle back to about 3500 RPM and enjoy the ride.
Butch
Wet Willy posted 06-17-2008 09:16 AM ET (US)
I have a 50 e-tec on a 13 Dauntless, Mine was mounted on the the lowest setting, just had it raised up one hole and it made a big difference, now I turn 5700 and the bow control is much better, I also have less torque steer and more trim range. Lower your motor all the way down, (while on the trailer), Place a yard stick on the cavitation plate and look where the plate is in relation to your keel. It will give you a starting point.
Good luck

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Author	Topic: E-TEC 60: Engine Mounting Height Leads to Porpoising
gabollini	posted 06-13-2008 05:05 PM ET (US) [I] have had my [Evinrude E-TEC 60-HP motor] for about two months, and [I am] enjoying the gas consumption. [I] had [my Evinrude E-TEC 60-HP motor] in Florida for a week solid and only blew through two tanks of gas. Oil consumption was also incredible. Like many have stated, [my Evinrude E-TEC 60-HP motor] was a little smoky due to oiling during break-in period, but after a while [my Evinrude E-TEC 60-HP motor] didn't smoke at all and purred like a kitten at idle. My only disappointment is [acceleration from a standing stop]. With a 13x19 pitch aluminum proppeller my top [engine speed] is about 5,100-RPM with two people aboard. [I] tried a 17-inch pitch [propeller]. Now my [acceleration from a standing start] is greatly improved, as well as throttle response, but [I] notice that my [engine speed] approaches almost 6.000-RPM with two aboard. Since [the maximum engine speed] for this [Evinrude E-TEC 60-HP motor] is 5,750-RPM, I'm inclined just to back off the throttle and settle with the 17-inch pitch propeller for water sports, then just use the 19-inch pitch propeller for cruising and fishing. I also notice that when using the 17-inch pitch propeller porpoising is common, unless [the Evinrude E-TEC 60-HP motor is] trimmed almost all the way down. I was thinking about putting one of those anti-porpoise fins on the lower unit to help out. Did my dealer put the [Evinrude E-TEC 60-HP motor] too low or too high? Any input appreciated. Thanks,
jimh	posted 06-13-2008 08:17 PM ET (US) What is the current engine mounting height? What kind of boat is it mounted on?
jimh	posted 06-13-2008 08:20 PM ET (US) [This article was posted in duplicate but the duplicate article has been removed.]
gabollini	posted 06-13-2008 10:44 PM ET (US) the motor is on a ss 15. Not sure how to measure the mounting height, but I know it's the 2nd from the top hole on the top. The mount for the bottom don't have holes. Seems like the motor sits lower in the water than my old suzuki 65. I'm not sure if that's because it's about 20# heavier or what. gabe
Jefecinco	posted 06-14-2008 09:16 AM ET (US) Changing mounting height is easy and it's something you can do at no cost. On our small Whalers weight distribution can also affect performance significantly. The proper propeller is also key to good performance and handling. Hydrofoils may be useful if after doing all else fails to accomplish your goals. I recommend trying for the perfect propeller and mounting height before mounting a hydrofoil. Butch
mikemdd	posted 06-16-2008 02:06 PM ET (US) As a reference point, if porposing is a problem with the engine trimmed all the way in, will raising the engine make the problem worse or better? Mike
2manyboats	posted 06-16-2008 10:43 PM ET (US) The operating range for the 60 E-TEC is 5500 to 6000 rpms and 5750 is where you get 60hp. My 60 is on a Montauk and I am one hole from the highest mounting and am propped to turn 6000 rpm with a light load.
Jefecinco	posted 06-17-2008 09:15 AM ET (US) Mike, Porpoising is normally experienced with the engine trimmed to or near the outermost limit for operation. Trimming the engine fully in tends to make the boat go very slowly even at WOT. In my experience it also makes the boat difficult to steer. When I raised my engine one hole from the dealer's initial setting it improved performance BUT it made the boat slightly more apt to porpoise when the engine is fully trimmed out. This is especially true when crossing old wakes which have flattened out. When I get porpoising I simply bump the trim switch once or twice to stop the movement. Typical operation for me from a standing start is to trim the engine in to a near vertcal position, advance to full throttle, immediately begin trimming the engine out while watching the trim gage, stop trimming when the gage indicates it is trimmed to my preference, throttle back to about 3500 RPM and enjoy the ride. Butch
Wet Willy	posted 06-17-2008 09:16 AM ET (US) I have a 50 e-tec on a 13 Dauntless, Mine was mounted on the the lowest setting, just had it raised up one hole and it made a big difference, now I turn 5700 and the bow control is much better, I also have less torque steer and more trim range. Lower your motor all the way down, (while on the trailer), Place a yard stick on the cavitation plate and look where the plate is in relation to your keel. It will give you a starting point. Good luck