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Location: North Australia | this might help someone out.
Steve.
http://cgi.ebay.com/ebaymotors/59-60-Desoto-60-Dodge-56-57-58-59-60... |
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Expert 5K+
Posts: 8947
 
Location: WHEELING,WV.>>>HOME OF WWVA | bracket can be had for 33$ . one wire alt can be had for 63$ --------------------------------------------------------later |
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Extreme Veteran
Posts: 524
Location: West Jordan | “This alternator will turn on at "idle" speed. No high revving”
Complete BS in most cases, the factory crank pulley is not large enough to spin the SI fast enough at idle to generate a field, but other than that, little pricey for a China alternator
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Expert
Posts: 2312
Location: Arizona | I've heard of this issue but don't understand it. Why isn't the battery enough to get it going? Voltage not high enough or ?? |
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Extreme Veteran
Posts: 524
Location: West Jordan | Well since you are asking and not arguing I will explain.
You can have 6, 12, 24, or more volts and it is not going to charge unless the rotor can spin fast enough to generate a filed. When DC voltage is applied to the rotor it turns it into an electro-magnet. The spinning magnet causes AC electricity to flow in the stator, and then the rectifier converts it to DC.
Generally speaking the rotor must turn about 1500 to 1600 RPM at the shaft to generate enough of a magnet field to induce current in the stator. So off the top of my head without doing the math it works out like this, a 8 to 9 inch diameter crank with a 2” alternator pulley will give you around 1600 shaft RPM at about 700 engine RPM. The limiting factor is the alternator pulley, anything smaller than 2” and the V-belt will slip, that is one of the reasons for the flat belt, it can grip a pulley as small as 40mm. The faster you spin the rotor the stronger the magnetic field and the more alternator output, depending on the alternators regulator that controls the field current to the rotor. This is the reason why your lights get brighter when you step on the gas.
So on early Mopar, in most cases the crank pulley is 5 and some change to 7 inch in diameter, they did this because they did not plan on the generator charging at idle, so they did not need a larger pulley, and it cheats the MPG and performance numbers.
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Expert
Posts: 2312
Location: Arizona | Some of the one-wires I've seen advertised say they are "self-exciting" and don't need to be revved up to get started. Do you know what they would be doing to make them "self-exciting"?? These might be newer designs then the SI, don't recall offhand. |
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Extreme Veteran
Posts: 524
Location: West Jordan | That is an age old sales tactic called lying, the field circuit is live that is the voltage is always there but when the rotor is spun to around 1600-2000 shaft RPM the magnetism is created and electricity flows in the stator, this is know in the industry as stator activated. With a one wire alternator there is always a parasitic draw, that is why the battery goes dead after a week to month of not driving it. You can chance the field activation point to some degree but the result is more key off draw on the system. One wires alternators may clean up the wiring but they are the dumbest thing in automotive electrical. |
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59-60 alternator conversion
