1950-1966 [Subscribe to Daily Digest] |
Here is more than I know about ignition coils. Anyone reading this please correct me if I am wrong.
An automotive ignition coil is in its most basic form a transformer that steps up the 12 volts from your car system to the 20,000 and up volts that are needed to arc across the gap of your spark plugs to burn the fuel mix.
Most coils range in the 3-8 ohm resistance across the primary side of the transformer up to 11,ohms across the secondary. (The links below explain all of this and include a drawing of how to test the coil.)
The coil charges and discharges every time a spark plug fires.
As the coil gets hot, the internal components can expand and cause them to short out inside. I have even heard of coils that burst or exploded when they shorted out.
Some coils use a resistor in the power feed wire to reduce the voltage coming into the coil from 12-14 down to 8 or so to reduce the amps put through the coil. Some coils have this resistance built in. Running coils on full 12 volts can put out more amps than some coils can stand.
How could the coil make your car run poorly? If the voltage across the spark plug drops the combustion process is not as complete leaving unburned fuel to fowl your plugs and also to cause backfiring. If the coil is heating up it could be shorting inside and not putting out the power you need. Does this sound to me like what is causing your problem? No.
Have you verified timing, choke operation, point condition and point gap?
Is your carb adjusted correctly? Are you picking up dirt in the fuel filter that is starving the carb of gas?
Do I think your over-tightened rod bolts are causing this? No. I would think all over tightening the rod bolts would do is to cause them to break eventually. Rod bolts, when tightened properly, stretch a prescribed amount and are held in tension. This is why rod bolts should never be re-used. They can only be stretched once. (The same for the flywheel mounting bolts.)
Did that help? Probably not. Try the links below.
http://www.geocities.com/MotorCity/1715/basics.htm
http://www.international-auto.com/tbcoil.html
posted by 69.68.74...
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