In any event, unless you are doing significantly more idling than driving this
drawdown duning idling is not really significant. This is what the battery is
for. If you had an ammeter you would see the amps pick up after idling to bring
the batt back up to full volts.
Of couse you need a good batt, and alternator.
rg
----- Original Message -----
From: R. Lindsay <050.rpl@gmail.com>
To: Tom McCay <Tom.McCay@ccw-tools.com>
Cc: pbrauen@gmail.com, Healey List <healeys@autox.team.net>
Sent: Mon, 12 Aug 2019 16:59:08 -0600 (MDT)
Subject: Re: [Healeys] Alternator Pulleys
Thank you!
Price Lindsay
Cell: 630-841-6300
Email: 050.rpl@gmail.com
Sent from my iPhone
> On Aug 12, 2019, at 6:39 PM, Tom McCay <Tom.McCay@ccw-tools.com> wrote:
>
> Hi Price, alternators do not kick in until they are rotating at about 1200
> alternator RPM. The pulley ratio is approximately 3:1 when comparing the
> bottom crank pulley to the alternator pulley. At idle of 800 RPM the
> alternator would be rotating at 2400 RPM so you should have a good output at
> idle. The smaller the alternator pulley the faster it will spin.
>
> Kindest regards
>
> Tom McCay
> Director
> www.ccw-tools.com
> Tel: 01522 888178
> ________________________________________
> From: Healeys [healeys-bounces@autox.team.net] On Behalf Of R. Lindsay
> [050.rpl@gmail.com]
> Sent: 12 August 2019 23:19
> To: warthodson@aol.com; pbrauen@gmail.com; Healey List
> Subject: [Healeys] Alternator Pulleys
>
> I have installed an alternator in my BJ8 to support ac with mixed success.
> Since our cars use a v-belt system I had to replace the pulley that came with
> the alternator(serpentine) with a v-belt pulley. I have checked the power
> the alternator and at idle, it is below the amperage needed to run the
> equipment I have installed.
>
> When I look at the circumference of the v-belt pulley and the serpentine
> pulley, the v-belt is definitely smaller. Should I use a v-belt pulley of
> similar size? Increasing the circumference of the pulley will make the
> alternator spin faster and maybe solve my issue of slow engine speed/low amp
> output, I think.
>
> If my thinking is correct, how big of a pulley should I use? I presume that
> if the pulley is too large, it may make the alternator produce too many amps
> and damage it. Should I match the size of the serpentine pulley or buy a
> pulley based on a calculation? (FWIW, I have no knowledge/experience to do
> this).
>
> The pulleys on the crank and water pump are standard Healey. There is ac
> installed and the pulley on the compressor is larger than the old generator.
> I have a two belt system so the alternator is belted to the compressor which
> if what I said above about larger pulleys spin their equipment faster, how
> should this be accounted for?
>
> I may be over thinking this but I would like to run the ac at a reasonable
> idle. Has anyone approached this and came up with a resolution?
>
> Thank you so much for any light that can be shed on this.
>
> Price Lindsay
>
> Cell: 630-841-6300
> Email: 050.rpl@gmail.com
>
> Sent from my iPhone
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