[Healeys] Alternator Pulleys
R. Lindsay
050.rpl at gmail.com
Mon Aug 12 16:59:08 MDT 2019
Thank you!
Price Lindsay
Cell: 630-841-6300
Email: 050.rpl at gmail.com
Sent from my iPhone
> On Aug 12, 2019, at 6:39 PM, Tom McCay <Tom.McCay at 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 at autox.team.net] On Behalf Of R. Lindsay [050.rpl at gmail.com]
> Sent: 12 August 2019 23:19
> To: warthodson at aol.com; pbrauen at 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 at gmail.com
>
> Sent from my iPhone
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