Alternator operation.

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Old 31 Oct 2012, 08:05 am   #1 (permalink)
Scribe
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Default Alternator operation.

Older alternators took a big drag on the starter and battery when cold
starting. An alternator can take from 5 to 10hp depending on size of course.
That is a lot of drag for a starter motor to turn when cold starting. A
starter motor can also be made smaller as there is less drag from the
engine.

I believe newer alternators delay charging until the engine has started.
How is this done? By external electronics or incorporated in the
alternator? If in the alternator then a replacement would benefit an older
engine.


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Old 31 Oct 2012, 10:09 am   #2 (permalink)
uncle_vito
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Default Re: Alternator operation.


"Scribe" <Scribenospam@nospam.com> wrote in message
news:k6r7m2$vd5$1@dont-email.me...
> Older alternators took a big drag on the starter and battery when cold
> starting. An alternator can take from 5 to 10hp depending on size of
> course. That is a lot of drag for a starter motor to turn when cold
> starting. A starter motor can also be made smaller as there is less drag
> from the engine.
>
> I believe newer alternators delay charging until the engine has started.
> How is this done? By external electronics or incorporated in the
> alternator? If in the alternator then a replacement would benefit an
> older engine.
>
>


The engine cranks at such a low RPM, the alternator is no load at all. You
have to run the RPM of the alternator up for it to create electric power.
For a test, take the belt off, turn on the ignition, and zing the alternator
with your palm. There is hardly any resistance. Try to turn it at 3000+
rpm like the engine does and you will find resistance (of course you cannot
do that with your palm).

Vito


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