Chapter 23: Alternator and Starter

Step 6:  Alternator and Starter

Although my engine came with a starter and alternator, I replaced them with a B&C starter and 60-amp alternator.  The B&C products are lighter and nowhere near as bulky as the original STC'd items that came off the Mooney.   The alternator and starter have to be installed at this point in the process because they need to be in place in order to form and shape the engine baffles.  The starter and alternator poke through the bottom baffling.  Cooling air from the high pressure side is used to cool the diodes in the alternator. 


The B&C alternator is the one on the left.  Surprisingly, it's not all that much lighter than the other alternator.  I guess there's no cheating the physics.  You need X amount of wire to produce Y amount of amps.  But the B&C alternator is smaller and takes up less real estate under the cowl.



The B&C starter is the one on the left.  Here, you can see its real advantage over the original starter.  The original weighs almost three times as much as the B&C starter, which is light (relatively speaking) and very compact.  The B&C starter has a wound field motor, not a permanent magnet motor like other starters.  Thus, it takes less amps to spin the engine.  Less amps means the battery isn't pulled down as much, which means less chance of ignition kickback and less chance of breaking the starter.