Round Back Alternator Rebuilder
So I guess this may leave you wondering why I'd want to measure some original or semi-original alternators.
A. Because its not clear how Chrysler rated their alternators. Most, but not all, years the Chrysler alternator ratings are higher than the 15 V, 1250 rpm test results. Ratings slapped on alternators seem to be based on whatever criteria a manufacturer wants to use. A Cardone 60 amp could be the same as a Chrysler 50 amp.
B. We know that some combinations of stator and rotors can produce more power at higher rpm, while reducing capacity at low rpm.
Here's set of output curves for GM's 10SI alternator which illustrates that.
The '63 amp' can produce more power than the '40 amp' at all rpms.
On the other hand the '72 amp' alternator can not produce more power than the '63 amp' alternator at low rpms.
And here again we apparently have yet a different voltage used in an output test. I say 'apparently' because this is graphic is from their catalog so is unlikely an actual test of a specific alternator.
So I guess this may leave you wondering why I'd want to measure some original or semi-original alternators.
A. Because its not clear how Chrysler rated their alternators. Most, but not all, years the Chrysler alternator ratings are higher than the 15 V, 1250 rpm test results. Ratings slapped on alternators seem to be based on whatever criteria a manufacturer wants to use. A Cardone 60 amp could be the same as a Chrysler 50 amp.
B. We know that some combinations of stator and rotors can produce more power at higher rpm, while reducing capacity at low rpm.
Here's set of output curves for GM's 10SI alternator which illustrates that.
The '63 amp' can produce more power than the '40 amp' at all rpms.
On the other hand the '72 amp' alternator can not produce more power than the '63 amp' alternator at low rpms.
And here again we apparently have yet a different voltage used in an output test. I say 'apparently' because this is graphic is from their catalog so is unlikely an actual test of a specific alternator.