Why not to use Seafoam in every tank for FE

[bobc455]

Originally Posted by RningOnFumes

That's an interesting statement. Are there threads here or on the interwebs which support that? I ask because this is the first time I've heard of it.

That's true in theory - biggest gap = most efficient combustion (until the point where you get misfires). There are downsides to a huge gap, but MPG will theoretically benefit.

I used to run a 0.065" gap on my Buick. Come to think of it, maybe I'll try that again.

Originally Posted by dkjones96

More gap means more voltage which means more time for the coil to make the required output to fire the plug, essentially retarding timing.

Nah, every coil around can build up plenty of voltage, it won't affect timing directly. If you watch a car with MSD on a scope, you'll realize that a coil can build up voltage about a hundred times faster than it really needs to.

However a larger gap will also REQUIRE more voltage, especially under heavier load. The more mass (air/fuel) in the cylinder, the harder it is to initiate the spark - and if the spark doesn't have enough "juice" to fire, then you completely miss that combustion cycle (which really will kill your MPG altogether). Generally your super-high HP race cars will run a very tight gap just because it is so hard to get a spark to jump from the electrode (or to the electrode, whatever).

For example when I run my Buick "day-to-day", I am fine with a gap of about 0.042". However if I go to the track and hit the nitrous, I have a different set of plugs which are set to 0.028" (and much colder heat range obviously).

-BC