Spark plugs on a 4.6 gt
#11
On any particular vehicle--or am I supposed to guess?
On a 1970 Mustang, assuming a stock motor with a distributor, it doesn't matter--you probably should not run precious metal plugs at all--in 1970 they weren't even a wet dream shared by spark plug engineers...
On a 1970 Mustang, assuming a stock motor with a distributor, it doesn't matter--you probably should not run precious metal plugs at all--in 1970 they weren't even a wet dream shared by spark plug engineers...
Last edited by cliffyk; 07-22-2010 at 07:58 PM.
#13
#1 / #6
#3 / #5
#4 / #7
#2 / #8
This is a good pictorial diagram of the EDIS:
FWIW: '96 to '98 4.6L engines use the EEC-IV system and the EDIS wasted spark ignition system; '99 to '04 use the EEC-V system and COPs.
#16
cliffy, i have a fully built stroker 96gt, cams and all,sitting at stock comression.i have never ran double plat plugs in my car. in fact i run autolite 103's. due to the fact they are 1 step cooler and a copper plug. A little better for performance. I always wondered why the Motor craft plugs all have the diff part numbers? Crazy info bro. But i have never had plugs wear out differently at all. I have msd coil packs on my car at the moment to. But if what u say is true(and i know it is) why would all the performance shops ive talked to and my tuner who is very reputable tell me to run copper plugs and not the PP plugs?
Brian
Brian
#17
cliffy, i have a fully built stroker 96gt, cams and all,sitting at stock comression.i have never ran double plat plugs in my car. in fact i run autolite 103's. due to the fact they are 1 step cooler and a copper plug. A little better for performance. I always wondered why the Motor craft plugs all have the diff part numbers? Crazy info bro. But i have never had plugs wear out differently at all. I have msd coil packs on my car at the moment to. But if what u say is true(and i know it is) why would all the performance shops ive talked to and my tuner who is very reputable tell me to run copper plugs and not the PP plugs?
Brian
Brian
Most likely you have not run the plugs for sufficient number of miles for the erosion to be apparent--this would take 25k+ miles to develop. Ford used the staggered (tip and side) platinum plugs because of the specified 100k service life.
As to the "copper" part that's a mostly marketing department thing--"copper" sounds good because we all know that copper is a good conductor of both heat and electricity.
The heat conduction part is irrelevant as spark plugs of a given heat range specification are designed to dissipate heat at the rate defined by that spec. Assuming that goal is met it, doesn't matter if the plug's core is made of copper, brass, aluminum, steel, or even petrified brontosaurus turd--all that matters is does the plug dissipate heat as per the specification.
The charming electrical characteristics of copper make good marketing speak too--however in reality the copper is a core plug inserted into the nickel-chrome alloy center electrode and due to a phenomenon known a "skin-effect" has nothing to do with conducting the electricity that creates the spark. It also costs a bit less than nickel-chrome alloy so between the marketing and cost benefits it's win-win...
Beyond that, why would having 1-1/2 inches of copper conductor, connected to the coil with a wire that has 3kΩ to 15kΩ per foot resistance (or at the end of a stainless steel "spring" as in the COP system), make a rat's back-end worth of difference in spark energy?
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