Dup...........

 

What's your stock gap call for? My 87' 302 call's for .042-.046. I'm running .056, but I also side gap the plugs. See link: Performance Unlimited 4-Wheel & Off Road Center - Hartford, Wisconsin - USA Technical Documents
This still allows intensity & greater Spark kernel exposure. Hard for fuel to escape it, regardless of higher compression demands or increasing air flow that's introduced while under load.

 

Yeah same deal with my 300Cid same specs

 

my 96 also calls for .042-.046 and I run .055. If you're running copper plugs (you should be), I'd say don't go over that by much because you do need some room for electrode wear. If you go up to .060, you might have to pull them and regap them partway through the spark plug's life.

 

Good point. Depends too on Coil output & plug type. I run side gap at .056 w/ copper cores & a 60K volt, .45 ohm coil. 16BTDC w/ 87-89 octane depending on the type of driving I'm doing.

W/ a 48K volt low ohm coil & copper cores, maybe .054 would be more appropreate, especially to start out w/. Double Platinums are not suited for stretching or increased timing because they require more resistance to be overcome to initiate spark, & their poor thermal transfer properties cause excessive temps to be retained in the combustion chambers, rather than transfering that heat away from it. Good for anti fouling, but bad for remaining below the ping threshold.

I've also been told that minimal adjustment if any should be done to platinums because it can cause the platinum to fracture and flake off. I was told this by an AC/delco Tech when I was considering stretching their double platinum Finewire plug. Of course side gapping a platinum plug is out of the question. AC/Delco Double Plat Finewires are a great plug if your running stock gap & timing. They'll even take a little timing bump.

Motorcraft copper cores are actually designed to fail before excessive temps cause piston damage. Double platinums will not fail at that temp range. They will take the piston out first instead.

Not sure how many miles sidegap are good for, but I'm at 12k+ right now on my first set. I'm not getting 20 mpg as I did initially, but also not missing either.

Although I'm not experiencing a drivability problem, I'm getting a TPS senor out of range code after replacing my none adjustable TPS sensor w/ an adjustable one. Can't seem to find to sweet spot w/ it. That might be the problem.

 

On the subject of gapping platinums. I changed the spark plugs & wires on my 00 mounty last week. The stock gap is .054-.056, but the recomended plugs Autolite 104's or 764's are gapped to around .043.

All the explorer guys say to run platinums for that setup. So I had no choice to regap the platinum plugs. I guess we'll see what happens.