Originally Posted by GalinHdz
Hmmmmmmmm I wonder if they have a 70+ amp version?
Nippon Denso makes two styles of alternators. The "small" units go from 30 amps to up to 60 amps. The "large" units go from 60 amps up to over 100 amps.
You want to use one out of a Honda. This is because auto engines rotate counterclockwise, except for Honda 4 cylinder engines [up to 2000]. Hondas and Lycomings rotate clockwise [viewed from driver's seat] Most newer Honda Accords with A/C have 70+ amp alternators.
Proper rotation ensures you will get maximum performance from the two internal fans in the large style alternator. That said, even with the fans running backwards, I doubt that you would have any issues, other than perhaps a shorter life span of the alternator.
Modern cars use serpentine belts to drive the alternator. You will need to buy a Vee belt pulley with a 15mm shaft hole to adapt a car alternator to a Lycoming. These are available at most automotive "speed" shops for a reasonable price. A 4" diameter pulley will work the best. Smaller pulleys will spin the alternator much faster than it does in a car, because the Lycoming flywheel pulley is much larger. Excessive speed will reduce the life of the rotor bearings.
The link below shows a B&C modified "small" style ND alternator.
The steel bracket and spacer tube on the alternator pivot is one of the "improvements" that B&C performs on their "small" style units. That spacer and bracket do not come on the stock ND small alternators.
The link below shows what a large ND alternator looks like
Notice the much "beefier" pivot point on the large ND unit. The stock automotive ND alternators look like this. The physically larger size and the bigger pivot point are the easiest ways to differentiate a "small" from a "large" ND alternator. FYI, the rectifier diodes on the large units are much more durable. Hope this helps you.
PS Chevy Corvair engines also rotated clockwise, but they used Delco Remy alternators, not Nippon Denso.