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i assume you mean the ignition coil and not the pickup coil (i also know that when you assume you make an ASS of U and ME)

ignition coils:

A models:

primary: 2.2 - 3.9 ohms
secondary: 10-16 K-ohms

D and ER models

primary: 2.2 - 3.5 ohms
secondary: 12-18 K-ohms
 

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Fast Old Guy
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Bance said:
That was a good Dummies Guide to Sparkplugs Intro which was well written ,informative and concise. Thanks.
Holy Cow! Somebody actually read it. Congratulations

FOG
 

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Just wanted to clarify a few points.

1)While current flows from a positive to negative electrical potential, electrons flow from a negative (ground) to positive potential.
2)Current is like the volume of water flowing through a garden hose, think gallons per minute. Voltage is like the water presure in that hose, think pounds per square inch. When you put your thumb over the end of the hose to shoot a stream of water further, you are increasing the pressure while reducing the rate of water flow. This is what the coil does, it acts like a transformer increasing the voltage but reducing the current. The high voltage allows the spark to jump the gap at the plug, 12 volts is not enough.

http://en.wikipedia.org/wiki/Ignition_system
 

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Awesome write-up, FOG. Cleared up a lot of the muddy thinking about spark plugs that I've picked up over the years.
 

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Definitely learned something here, good write up.

The whole radio interference thing reminds me of a time I was at my dad's small engine shop. I think it was a blower he was running, and he walked outside with it to adjust the carb. He has a radio where I was sitting that is tuned into the airport's (Right across the steet) frequency. I noticed I was hearing the blower from a odd direction, only to find out I was hearing the motor running through the radio. (I'm not really sure if that is relevant, just thought it was cool).
 

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17 Posts
FloridaEX500 said:
Use the dr9eix or the dr8eix, one is hotter than the other, use the tutorial to determine which is best for your particular needs.

Florida uses the dr9eix on his previous race engine on his gen 1 ex. They work great.
I read it, FOG. But I also read elsewhere, Florida, not to use resistor plugs and the ix are iridium which are resistor plugs. 5k resistance average.
 
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