[Healeys] Alternator Pulleys

[R. Lindsay]

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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