Posted by jdemaris on April 02, 2009 at 06:04:35 from (67.142.130.25):
In Reply to: 6 Volt vs 12 Volt posted by John B. on April 01, 2009 at 19:19:55:
Yes, tell me how fast it cranks at below zero.
How many 6 volt diesel starters have you seen? Ever wonder why they didn't work? There was enough trouble with early 12 volt diesel starters; thus the reason many were 24 volt.
Sounds like you never owned and drove a car with a generator and the headlights on at low engine speeds?
Also, tell me how well it charges when you run it at night with 10-20 amps worth of lights hooked to it, at low engine speeds.
It's a matter of improved technology. Many if not most older 6 volt systems, when all is perfect, will not crank over the engine at zero degrees or below, as well as some newer 12 volt systems. It's not because 12 volt is automatically better than 6, it's more because as technology shifted to 12 volts, more cranking-amp capacity was also added along the way. Also, there is much less chance of loss along the circuit as the voltage gets higher.
In addition, take a starter designed for a 6 volt system and intended to crank on 4 1/2 - 5 volts DC, it will do much more hooked to a 12 volt battery cranking a 9 or 10 volts.
Then there's the old generator. Regardless if 6 volt or 12 volts, it basically only uses 1/2 the power it makes. Instead of using diodes to recitfy AC into DC, it just selects a small portion of power from the commutator to keep things DC, and does not use the rest. So, an alternator is much more efficient, powerful, compact, and lighter.
One more thing. Much easier to find deals on 12 volt batterys and accessories.
I've got several old tractors still original, with 6 volt systems. I don't have to start them up when its 20 below, and I don't need headlights on them either. A couple of Case VACs, three Case DCs, a few Deere two cylinder crawlers, a Shaw R12, Oliver Cletrac HG and OC3, several Ford Model AA trucks, etc. With any, if I have to start them in extreme cold, things go much better if I unhook the 6 volt battery, and temporarily stick in a 12 volt. Night and day difference.
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