Flat blade type or wire gauge for checking plugs gap?

I think it comes down to personal preference - I used the wire type for years, but lately have changed to the round disk type. It seems quicker and more accurate to me - and you can tell instantly how far off the gap is, so you have a better idea of how much to "move" the electrode.

 

I use the circle gauge also.......whatever you can find!!

 

Six of one, half dozen of the other. Like they said. Personally, I find the flat blade a little easier to work with. I can insert it in the gap and see how much its off. The wire type is more "go-no go".

 

I like the flat type for setting new plugs but prefer the round variety for resetting used plugs.

 

Same here.

aehaas

 

If you are using Iridium or other types of fine wire electrode spark plugs you should use the wire type gap tool as you can quite easily damage the electrode with the circle style tool.

http://www.ngksparkplugs.com/tech_support/spark_plugs/installation/index.asp?mode=nml#gapping

 

Feeler gauges (flat blades) are the least accurate -- if not used properly.

The progressive thickness (ramp) gauges are the most accurate -- if it's a high quality, precision-made unit.

Wire gauges are neither, but that's what I use -- because I'm an idiot