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Old 01-24-2017, 01:06 AM   #361 (permalink)
92 Civic VX since 2002
 
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I drive about 12 miles a day round trip in my civic, so I'm seriously considering the alt delete using flexible solar panel attached to the roof... 1 deep cycle battery... or at minimum the on/off switch to a minimum drop it to the lower charge. First I'll be going to LED head lights and marker light, tail lights etc...

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Old 12-05-2017, 11:43 PM   #362 (permalink)
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Sorry I'm coming into this thread pretty late. But wouldn't you save from getting a smaller alternator? Like for instance my civic has an 80 amp alternator. And I also have an old 87 pickup (Nissan nothin major) that has a 40 amp alternator. And between the two nothing's really different. Neither of them have ac and it's very basic as far as options go. So wouldn't a smaller 40 amp alternator do the trick by Increasing mpgs and maintaining drivability?
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Old 12-06-2017, 12:21 AM   #363 (permalink)
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Quote:
Originally Posted by Ni87 View Post
Sorry I'm coming into this thread pretty late. But wouldn't you save from getting a smaller alternator? Like for instance my civic has an 80 amp alternator. And I also have an old 87 pickup (Nissan nothin major) that has a 40 amp alternator. And between the two nothing's really different. Neither of them have ac and it's very basic as far as options go. So wouldn't a smaller 40 amp alternator do the trick by Increasing mpgs and maintaining drivability?
I believe you would see little if any improvement. The load from the alternator on the engine is mainly a function of the electrical load on the alternator, not its capacity.
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Old 12-06-2017, 12:27 AM   #364 (permalink)
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The alternator delete or switch and deep cycle battery is a good idea. Replacing lights with LEDs will allow a smaller battery, or longer run times.

Quote:
Originally Posted by Ni87 View Post
wouldn't a smaller 40 amp alternator do the trick by Increasing mpgs and maintaining drivability?
No, alternators are sized according the vehicles electrical needs. While a 40 amp alternator might be sufficient most of the time, it is likely to be insufficient in certain instances when the lights are on high, the windshield wipers are going, the blower motor is blowing, etc. The extra stress is likely to cause premature failure, and any MPG gains would be minuscule. An alternator attempts to deliver the electrical energy that is being consumed regardless of size, and it robs the engine of the power necessary to deliver that energy.

BTW, 1 horsepower is 746 watts. Since there are losses converting mechanical energy from the engine to electrical in the alternator, more power is sapped from the engine than is generated by the alternator.

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