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<DIV>Given the endless discussions on this topic, thought it would be useful to
remind myself and any others who are interested in the major differences between
alternators and generators</DIV>
<DIV> </DIV>
<DIV>In a gen. the heat generated is in the rotating armature that is on the
inside of the enclosure and this is why cooling is important/difficult and the
fan on the pulley provides this through the enclosure. The brushes on a gen work
hard and switch full current several times per rev. hence the wear and sparking.
Gen usually has an oilite bearing at the rear that also wears. This is a
critical component as wear (dry no oil) could eventually lead to scraping of the
armature on the field poles and throwing of lead at comm. Take care of your
brushes, bronze bush and bearings and you will have a reliable gen.</DIV>
<DIV> </DIV>
<DIV>An alt. is inverted with the main winding on the outside (easier to cool
hence more output) and the field on the inside; hence the shape - larger
diameter and shorter. No mechanical commutator switching needed as this is done
by diodes. Slip ring brushes feed low dc amps to the internal rotating field -
that last almost forever. Alt usually have more reliable front and rear rotor
bearings and less rotational weight as the main windings are on the stator and
thus more mechanically robust than a gen.</DIV>
<DIV> </DIV>
<DIV>The discussions here also confuse me about the amps needed for our cars. I
am with Chris on this one and wonder why you would need an 80 amp alt ?? !!
Unless you run an extra 2 spots for long periods you likely don’t need the hi
output of an alternator rather the mechanical reliability and the improvement of
eliminating the mechanical regulator.</DIV>
<DIV>Lets say headlights at 55W each; 5 amps for ignition and auxiliaries; 3
amps for side lights (convert these plus brake lights to LED’s to lighten your
load); blower at 3 amps; wiper at 5 amps; OD 1 amp as worst case continuous.
This gives a total of around 26 amps full house driving at night in the Winter
and raining ! Intermittent loads are horn, brake lights, indicators. etc.
</DIV>
<DIV> </DIV>
<DIV>No doubt one day will convert to an alt but it would likely be to eliminate
the awful cheap non adjustable regulator that I had to purchase after my 50 year
old Lucas one failed.</DIV>
<DIV>rg</DIV>
<DIV> </DIV>
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<DIV style="font-color: black"><B>From:</B> <A
title=austin.healey@gmail.com>Chris Dimmock</A> </DIV>
<DIV><B>Sent:</B> Monday, May 1, 2017 6:42 AM</DIV>
<DIV><B>To:</B> <A title=simon.lachlan@homecall.co.uk>Simon Lachlan</A> </DIV>
<DIV><B>Cc:</B> <A title=healeys@autox.team.net>Healey List</A> </DIV>
<DIV><B>Subject:</B> Re: [Healeys] Dynalite or which alternator to C42
Generator</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV>The funniest thing I find about the "alternator inside a generator"
conversions is the bloody pulley. It might look like a generator body - but you
have to run a tiny pulley, because it needs a bucket load of revs to generate
didly squat, more than a generator. </DIV>
<DIV id=AppleMailSignature>Any good Lucas generator runs a Larger pulley -
because it generates enough amps and stuff at low revs. Seriously men. Who revs
their car past 5,000 rpm on the road? </DIV>
<DIV id=AppleMailSignature>I run a C42 with a bigger DWR Pulley. </DIV>
<DIV id=AppleMailSignature>That means I'm slowing down the old Lucas C42.
Because it already generates enough power. </DIV>
<DIV id=AppleMailSignature>Ok. I'm not running a 1,000 watt sound system or 4
IPods, and a grille full of spotlights. FFS - it's a Healey!!</DIV>
<DIV id=AppleMailSignature>So if you run one of these alternator inside a
generator silly things, it's a joke. You've got a fake, compromised alternator.
Immediately identified by the pulley. An alternator needs air for cooling. A
generator casing doesn't provide that. </DIV>
<DIV id=AppleMailSignature>Run one or the other. Generator or alternator. I've
got no issue if you run an alternator. Run a good, sensible, reliable one.
</DIV>
<DIV id=AppleMailSignature>Nearly as stupid as putting a disc brake inside a
brake drum. Same issue. </DIV>
<DIV id=AppleMailSignature>Innovative- but it doesn't work unless all you do is
drive to a coffee shop. </DIV>
<DIV id=AppleMailSignature>Simon. Just get a C42 and return the core when you
get back. </DIV>
<DIV id=AppleMailSignature>Best Chris</DIV>
<DIV id=AppleMailSignature>Being Grumpy about modern shit. </DIV>
<DIV id=AppleMailSignature><BR><BR>Sent from my iPhone</DIV>
<DIV>On 1 May 2017, at 3:54 am, Simon Lachlan
<<A>simon.lachlan@homecall.co.uk</A>> wrote:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
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<P class=MsoNormal>My nephew’s generator issues may resolve themselves soon.
May…….<o:p></o:p></P>
<P class=MsoNormal>We may look at replacing the C42 in his BJ8 with an
alternator, one of the generator lookalikes.<o:p></o:p></P>
<P class=MsoNormal>Dynalite is one of the names I’ve come across, as sold by
Holden’s. The Usual Suspects don’t seem to give their lookalikes their brand
names.<o:p></o:p></P>
<P class=MsoNormal>Anyhow, I know this topic came up a few months back, but I
wasn’t interested then! So:-<o:p></o:p></P>
<P class=MsoNormal>Does anyone have experience of these things?<o:p></o:p></P>
<P class=MsoNormal>Is any brand better than another??<o:p></o:p></P>
<P class=MsoNormal>Etcetc.<o:p></o:p></P>
<P class=MsoNormal>Holden’s claim 45amps for theirs. AHSpares claim 50amps. A
BJ8’s C42 generator kicks out 30amps max. It seems that one does need the BIG
fuse in the Dummy Control Box. When I put in my alternator, a Lucas ACR, I put
in an extra cable to carry the extra amps…….apparently if the alternator is
really belting out the amps, the old wiring is a bit marginal.<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>Any other thoughts? <o:p></o:p></P>
<P class=MsoNormal>Kind advice to the effect that putting more modern
electrics in our old bangers is streng verboten is unnecessary at this
time.<o:p></o:p></P>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>Thanks,<o:p></o:p></P>
<P class=MsoNormal>Simon<o:p></o:p></P></DIV></DIV></BLOCKQUOTE>
<BLOCKQUOTE type="cite">
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