Another option for an alternator, with more power, which I don't see anybody
mentioning , would be a Triumph alternator from a TR7 or TR8 with A/C.
Al Salvatore
76tr6
----- Original Message -----
From: "Steve Hanselman" <tr6@kc4sw.com>
To: "Andrew Packard" <apackard@triad.rr.com>; "'R. Ashford Little II'"
<ralittle2@mindspring.com>; "6-Pack" <6pack@autox.team.net>
Sent: Monday, October 21, 2002 12:50 AM
Subject: RE: Alternators and Radios
> One of the major problems with anything relating to entertainment is a
real
> inflated sense of what they are delivering. I'd never accuse them of
lying,
> but on the other hand I'd be extremely surprised if any of the 100 watt
> amplifiers delivered anything close to 100 watts.
>
> On another note the math below is incorrect. Assuming that the amp in
> question really delivers 100 watts output and that it is 75% (a
reasonably
> optimistic view) efficient this means it takes over 133 watts. Converting
> this to required current gives 10.1 amps (assuming a terminal voltage of
> 13.2VDC). Given that audio is never continuous the peak current is
probably
> closer to 20 Amps at any given instant this depends on the ratio of highs
to
> lows (highs take more power than lows).
>
> Remember these are the same folks who bring you that 6Hp compressor that
> runs on a standard 15 amp 120 outlet.
>
> Having said that I'd put the largest deep cycle battery that'll fit in the
> car and let the stock alternator run it. Just don't drive to long after
> dark
>
> Just my two cents worth (well maybe .075 cents worth)
>
> Steve
>
> tr6@kc4sw.com
>
>
> -----Original Message-----
> From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net]On
> Behalf Of Andrew Packard
> Sent: Sunday, October 20, 2002 8:12 PM
> To: 'R. Ashford Little II'; 6-Pack; Triumphs@autox. Net
> Subject: RE: Alternators and Radios
>
>
> The Ford Fiesta Bosch alternator has a 55 amp rating. The installation is
> incredibly easy. I just had to get a slightly shorter fan belt and shave
a
> bit of the mounting bracket to allow for the alternator fan blades to
clear
> it. Even the plug from my Lucas pushed right into the Bosch. I would
think
> that 55 amps would be enough to run about any reasonable stereo set up you
> would want.
> Andy
> TR250
>
> -----Original Message-----
> From: R. Ashford Little II [SMTP:ralittle2@mindspring.com]
> Sent: Sunday, October 20, 2002 5:26 PM
> To: 6-Pack; Triumphs@autox. Net
> Subject: Alternators and Radios
>
> I've got the stock alternator or my 70 TR6. I'm thinking of upgrading
> the stereo to add an external amp to my CD player, however, I'm a bit
> worried that with my stock setup it's not such a good idea. I also lack
> almost all skills related to electrical so I'm turning to those my DC
> inclined. I was given this example and would like to know if this is a
> good rule of thumb?
>
> Let's say that you have an amp rated at a total of 100 watts (either
> 25x4 or 50x2). To get the estimated draw you would take the 100 and
> divide it by 14.4 which yields 6.94 amps. Is this correct? Also there
> is supposed to be some efficiency loss in the amp so I was told that you
> would really take something like 100 x .75 (25% loss due to heat) =
> 75/14.4=5.21 amps.
>
> All amps, just like anything, are not created equal either. You can buy
> an el cheapo model that supposedly rated at X rms per channel vs. brand
> B which is a true reflection of their advertised power. How do you
> figure that in?
>
> What is the estimated draw of the lights and blower when on? This will
> give me an idea of how much excess I'm dealing with. Also, this looks
> like it might necessitate an upgrade to the Ford Fiesta alternator.
> What's the output of that again?
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