Plug gaping, with cylinder variation

[Checkered-Member]

Not all cylinders are born equal, for example, the two middle cylinders run a little hotter, then the rest, also (on my alti) #4 gets the most air while #1 gets the least because, if you have a turbo manifold that’s not perfectly equall, or a log style, the cylinder that has the long runner will run leaner then the cylinder with a shorter runner. Also compression varies slightly from cylinder to cylinder.

Are all these variations big enough, so that every spark plug will be gaped a little differently?

[andrave]

I've never heard of someone thinking of it that way. If you read your plugs and one looks like it needs changes made, you could change the gap. But, eh... are those tiny variances enough to make a difference? I doubt it.

[TrunkMonkey]

But, eh... are those tiny variances enough to make a difference?

those tiny variances are enough to give you a headache if you worry about them.

-demetrius

[andrave]

yeah, but gapping plugs in advance for predicted cylinder differences?