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Author Topic:   Electrical Details E-TEC 115-HP
jimh posted 12-03-2006 05:34 AM ET (US)   Profile for jimh   Send Email to jimh  
The Bombardier Recreational Products E-TEC 115-HP is a V4 two-stroke with a compact profile. When you remove the cowling there are several plastic shrouds which conceal most of the works.

Photo: Bombardier Evinrude E-TEC 115 with cowling removed

If you remove the shroud you find the Engine Management Module (EMM) is mounted atop the engine. The flywheel is cast with an integral fan to create air flow over the area. This helps remove heat which tends to build up in the upper part of the cowling.

Photo: Close up of the flywheel and EMM on E-TEC 115

This view shows the fan blades of the flywheel. Also note the flywheel is retained with five studs and nuts. This is a departure from the older style where a single large nut retains the flywheel on a threaded crankshaft. The EMM sits at an angle on the rear of the engine. The cooling from the fan should prolong the life of the stator coils of the permanent magnet alternator which has 1,800-watts of output and provides 50-amperes of battery charging current.

an86carrera posted 12-03-2006 06:26 AM ET (US)     Profile for an86carrera  Send Email to an86carrera     
Fichts have a fan built-in also.


BOB KEMMLER JR posted 12-04-2006 11:45 PM ET (US)     Profile for BOB KEMMLER JR    
Are these the same V4's that have been around for years,just adapted to the new ficht/etec technology?
andygere posted 12-05-2006 01:20 AM ET (US)     Profile for andygere  Send Email to andygere     
Chuck Tribolet posted 12-05-2006 08:21 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
50 amps at 12V = 600 watts. What happens to the other 1200


jimh posted 12-05-2006 08:55 PM ET (US)     Profile for jimh  Send Email to jimh     
The portion of the permanent magnet alternator output current which is not available for battery charging is used to operate the engine itself. The E-TEC engine, like many modern internal combustion engines with advance electronic controls and many electrically operated devices, requires a considerable amount of electrical power to run.

Fortunately, the amount of mechanical energy (horsepower) needed to generate electrical energy (watts) is not excessive, and one horsepower can produce 750-watts of electrical energy (at 100-percent efficient conversion). Therefore, to produce 1,800-watts of electrical energy from the mechanical energy of the motor will consume only about 1800/750 = 2.4-HP (or probably slightly more as the conversion will not be perfectly efficient).

The permanent magnet alternator used in the E-TEC is a very efficient and advanced design, and it is able to produce all of the energy required to run the motor and have excess electrical power available for battery charging even when the engine is operating at relatively low speeds. The design of the E-TEC permanent magnet alternator is quite advanced and employs sophisticated switching of the stator winding from series to parallel connections as the engine speed varies so as to take maximum advantage of the electrical current generation capabilities.

As a result, the E-TEC can generate all the electrical power it needs to run itself and still produce significant battery charging current to replenish the starting battery.

For a more in-depth discussion of modern vessel electrical power generation techinques, see my article in the REFERENCE section:

Boat Electrical Power Generation
by James W. Hebert

jimh posted 12-05-2006 08:58 PM ET (US)     Profile for jimh  Send Email to jimh     
Also, battery charging is done at a nominal 14-volts, so 50-amperes of charging current is more like

50 X 14 = 700 watts

BOB KEMMLER JR posted 12-06-2006 01:51 PM ET (US)     Profile for BOB KEMMLER JR    
[Speculated about the influence of alternator load on boat speed. For discussions of boat speed, please use the PERFORMANCE discussion. Thanks--jimh]
jimh posted 12-06-2006 04:14 PM ET (US)     Profile for jimh  Send Email to jimh     
The E-TEC permanent magnet alternator system is typically more efficient than an automotive-style alternator often seen in other outboard motors (such as the Mercury motors), so the E-TEC uses less mechanical energy to generate electrical energy. This is explained in detail in the article I mentioned above. Automotive alternators are now switching over to outboard-motor-style permanent magnet alternators built into their flywheels because the electrical loads in vehicles have increased substantially and they need to generate electrical energy at higher levels and with greater efficiency.
BOB KEMMLER JR posted 12-06-2006 04:27 PM ET (US)     Profile for BOB KEMMLER JR    
Thanks for the info. I recently saw that some autos were going over to the flywheel mounted alternator setup. I sure hope they are long lasting or that would be quite a repair bill for just bad alternator.
jimh posted 12-06-2006 09:49 PM ET (US)     Profile for jimh  Send Email to jimh     
Bob--An abacus is a simpler device than Apple MacBook Pro, and the replacement costs are lower, too. Sometimes you just have to accept that with advanced performance comes the risk of higher costs of maintenance. It is a trade-off. Outboard motors range in technology from a Model-T era to having more microprocessor power than the Apollo Lunar Lander. You just have to pick a point at which you feel comfortable.

Your really ought to read my article on vessel electrical systems to get a better feel for how much more reliable, simpler, and how many fewer mechanical and electrical components there are in a permanent magnet alternator built into a flywheel as compared to a belt-driven automotive style alternator. I'd repeat all that again, but there is no point; I say it all in the article. Perhaps you would indulge me with reading it.

andygere posted 12-06-2006 11:43 PM ET (US)     Profile for andygere  Send Email to andygere     
I have not experienced any loss of top speed since repowering my Outrage 22 Cuddy from a 200 h.p. Black Max to a 200 h.p. E-TEC. Displacement is just about the same on both motors, and I've yet to get the E-TEC to the top of it's RPM range. I'd venture to guess that propped right, the boat may squeak out an extra mile or two per hour over what the old motor was able to do. I would attribute that to a more precise induction and ignition system that really gets the most out of the potential energy in every unit of fuel. That or the cool white color, I'm not sure.

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