[Healeys] Alternator Pulleys

Mark Fawcett m.fawcett at cox.net
Wed Aug 14 09:57:58 MDT 2019


Gee, I have both. Guess I'll have to leave the List.
Mar Fawcett
1959 BT7 (or some other random vehicle)

On Tue, Aug 13, 2019 at 5:29 PM Roger Grace <roggrace at telus.net> wrote:

> Agreed - or 5 spd Toyota transmissions ... !!
> rg
>
> ----- Original Message -----
> From: Michael Salter <michaelsalter at gmail.com>
> To: Roger Grace <roggrace at telus.net>
> Cc: Price Lindsay <050.rpl at gmail.com>, pbrauen at gmail.com, Tom McCay <
> Tom.McCay at ccw-tools.com>, Healey List <healeys at autox.team.net>
> Sent: Tue, 13 Aug 2019 15:29:01 -0600 (MDT)
> Subject: Re: [Healeys] Alternator Pulleys
>
> Real Healeys don't have alternators \uD83E\uDD23\uD83E\uDD23\uD83E\uDD23
>
> On Tue, Aug 13, 2019, 1:45 PM Roger Grace, <roggrace at telus.net> wrote:
>
>> 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 at gmail.com>
>>
>> To: Tom McCay <Tom.McCay at ccw-tools.com>
>>
>> Cc: pbrauen at gmail.com, Healey List <healeys at 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 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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