[Public-list] 78 Amp alternator/Atomic 4

[dan walker]

rick is sooooo right about the marine ignition protected alternator and fires
dan

Rick Leach <RLeach at mbayaq.org> wrote:
Mike,

Good question...I'm interested to hear what the consensus will be. In the meantime, here are some thoughts:

On a 12 volt system 35 amps is equal to .56 hp and 78 amps is equal to 1.25 hp, a difference of about .69 hp. If you factor in a generous "fudge factor" of, say, 25% loss due to inefficiencies in the mechanical-electrical conversion the difference is closer to about .86 hp. The impact of the additional load will vary with your RPM's. At lower speeds it will represent a greater percentage of the engine's output. If you're properly propped and spend most of the time running near the "sweet spot" in the power curve I doubt that you'll notice it very much. 

There are some issues with a basic automotive alternator with regard to operating it in a potentially flammable atmosphere. I believe a proper marine alternator is "ignition-protected" to minimize sparking that could ruin your day, thus negating any savings. 

If you have enough load to justify it, I think a high-output alternator is a good idea, but a proper marine alternator is essential with a gasoline engine.

Rick Leach
S/V Sugar Magnolia, #121
Monterey, California


****************************************************

Date: Thu, 2 Sep 2004 11:51:26 -0400 
From: "Meinhold, Michael J" 

I need to replace or rebuild my alternator. Mamock Automotive is offering a
rebuilt Delco that will output 78 amps.
My old one was nominally 35 amps. My question is : should I expect my Atomic
4 to drive this alternator without slowing down much? Anyone have a similar
sized one on an A4?

Mike

Mike Meinhold
Rinn Duin #272
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