Coil polarity
When installing the coil, I was unable to find ant reference to polarity in the Hudson wiring diagrams. A quick google found this bit below from the Chicagoland MG Club.
Paul O'Neil
SoCal
1926 Hudson Anderson Coupe
1929 Hudson Town Sedan
1939 Cadillac Coupe (How'd that get in here?)
www.cichet.us
www.aeromark.net
&&&&&&&&&&&&&&&&&&&&&
Coil Polarity
I was converting my older British car over from positive to negative ground when I came across the question of coil polarity. I discovered coil polarity is very much misunderstood. In researching it, I was very confused until I found out there are two definitions of coil polarity. I talked to three or four knowledgeable people on the subject and read several technical books and articles. Everything made sense in itself but didn't jive together until I found out they were talking apples and oranges.
Definition #l Coil Polarity (In relation to battery)
The polarity of the coil should match that of the battery by connecting it so (+) goes to (+) and (-) connects to (-). But don't worry about which way you install the battery (positive or negative ground) or which way you install the coil (regardless of coil markings) it will automatically adjust itself. The coil will work efficiently and put out the same voltage either way it is hooked up, but the spark plugs are more sensitive when it comes to polarity, hence our second and more important definition.
Definition #2 Coil Polarity (In relation to spark plugs)
Coil polarity should be such so as to provide negative polarity to the spark plugs center electrode.
It has been found that it takes approximately 15% less voltage to form an arc at the plugs, if the hotter center electrode is negative, and the cooler (by comparison) ground electrode is positive. The center electrode is hotter since heat transfer from the tip must make its way through the porcelain insulator past the sealing gaskets to the shell block and then to the water jackets.
If your center electrode is positive, your car will probably still run fine until, with its 15% handicap, it exceeds the coil output. If you live where temperatures dip down to 0
Paul O'Neil
SoCal
1926 Hudson Anderson Coupe
1929 Hudson Town Sedan
1939 Cadillac Coupe (How'd that get in here?)
www.cichet.us
www.aeromark.net
&&&&&&&&&&&&&&&&&&&&&
Coil Polarity
I was converting my older British car over from positive to negative ground when I came across the question of coil polarity. I discovered coil polarity is very much misunderstood. In researching it, I was very confused until I found out there are two definitions of coil polarity. I talked to three or four knowledgeable people on the subject and read several technical books and articles. Everything made sense in itself but didn't jive together until I found out they were talking apples and oranges.
Definition #l Coil Polarity (In relation to battery)
The polarity of the coil should match that of the battery by connecting it so (+) goes to (+) and (-) connects to (-). But don't worry about which way you install the battery (positive or negative ground) or which way you install the coil (regardless of coil markings) it will automatically adjust itself. The coil will work efficiently and put out the same voltage either way it is hooked up, but the spark plugs are more sensitive when it comes to polarity, hence our second and more important definition.
Definition #2 Coil Polarity (In relation to spark plugs)
Coil polarity should be such so as to provide negative polarity to the spark plugs center electrode.
It has been found that it takes approximately 15% less voltage to form an arc at the plugs, if the hotter center electrode is negative, and the cooler (by comparison) ground electrode is positive. The center electrode is hotter since heat transfer from the tip must make its way through the porcelain insulator past the sealing gaskets to the shell block and then to the water jackets.
If your center electrode is positive, your car will probably still run fine until, with its 15% handicap, it exceeds the coil output. If you live where temperatures dip down to 0
0
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