I wasn't actually looking for an argument. I didn't say your statement was wrong, either. I simply pointed out that if you're running an electronic CD-type ignition system then, yes, the coil can improve performance and overall engine efficiency.
You also said that you weren't aware of a hot rod article regarding ignition coils and how they relate to performance, so I posted one.

 

Good discussion pal, nothing serious here.
Hot Rod does good stuff. They regularly post up good articles on dyno tests comparing heads, manifolds, headers... data. I believe in the stuff they put up, given that they sell ads.
But I have never seen a dyno test with a motor with common ignition up against a high-priced aftermarket flame-throwing unit. If you can point to one, I will give up.
My belief is that we are in the business of helping guys get hard-working old trucks up and running for Monday morning. My belief is that we are not here to tale a .1 second off the quarter-mile time of this old iron. Hot Rod opinion words sans data or no.
Coil replacement is a money dump. Coils almost never fail, are often replaced for nothing. A simple resistance check tells the tale.
Hand grenades coming.
All in good sport.

Semper Fi

 

Agreed.

 

The simplest explanation is, that if a spark plug requires 8,000 volts to fire across a .035 gap, that is all that will be provided even using a 40,000 volt coil. Heavy loading, worn or fouled plugs, increased gap etc can increase the voltage required.

 

Exactly. The spark plugs act as a voltage clamp. Once the 8,000 volts is reached the plug arcs.

 

Eait till dark tonite. Open the hood and start the engine. Look under the hood at the engine and chek to see if you have any sparks jumping around. if you do , that indicates some problems with the plug wires or coil to cap wire.

 

Helpful hint. If the wires are bad and sparking externally you can use this simple aid to help see 'em and HEAR 'em. Get a simple spray bottle full of tap water. While the engine is idling and doing Sandman's test, use the spray bottle to "mist" the water over the wires. If they are sparking externally those sparks will be better able to be seen and they will have a pronounced "click" or "snap" to 'em. CAREFUL of the engine fan!
Edit. Beat ya to it Orich!