[Healeys] Dynalite or which alternator to C42 Generator

Tue May 2 02:48:31 MDT 2017

There you are, 26A at full house.
How much does the generator generate? 20-25A if you are lucky.
Kees Oudesluijs

Op 2-5-2017 om 7:34 schreef Roger Grace:
> 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
> 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.
> 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.
> 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.
> 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.
> 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.
> rg
> *From:* Chris Dimmock
> *Sent:* Monday, May 1, 2017 6:42 AM
> *To:* Simon Lachlan
> *Cc:* Healey List
> *Subject:* Re: [Healeys] Dynalite or which alternator to C42 Generator
> 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.
> 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?
> I run a C42 with a bigger DWR Pulley.
> That means I'm slowing down the old Lucas C42. Because it already 
> generates enough power.
> 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!!
> 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.
> Run one or the other. Generator or alternator. I've got no issue if 
> you run an alternator. Run a good, sensible, reliable one.
> Nearly as stupid as putting a disc brake inside a brake drum. Same issue.
> Innovative- but it doesn't work unless all you do is drive to a coffee 
> shop.
> Simon. Just get a C42 and return the core when you get back.
> Best Chris
> Being Grumpy about modern shit.
>
>
> Sent from my iPhone
> On 1 May 2017, at 3:54 am, Simon Lachlan 
> <simon.lachlan at homecall.co.uk> wrote:
>
>> My nephew’s generator issues may resolve themselves soon. May…….
>>
>> We may look at replacing the C42 in his BJ8 with an alternator, one 
>> of the generator lookalikes.
>>
>> 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.
>>
>> Anyhow, I know this topic came up a few months back, but I wasn’t 
>> interested then! So:-
>>
>> Does anyone have experience of these things?
>>
>> Is any brand better than another??
>>
>> Etcetc.
>>
>> 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.
>>
>> Any other thoughts?
>>
>> Kind advice to the effect that putting more modern electrics in our 
>> old bangers is streng verboten is unnecessary at this time.
>>
>> Thanks,
>>
>> Simon
>>
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