Posted by Joe (Wa) on March 06, 2011 at 22:33:18 from (67.142.175.22):
In Reply to: Cleaning spark plugs posted by GeneMO on March 06, 2011 at 15:31:09:
The reason they aren't popular anymore is that they are not economical to use except to a guy that has lots of free time.
Look at a new quality plug, the porcelain is shiny and smooth, the surrounding metal is smooth & bright. That is to provide a surface that is resistant to carbon build up and easier to blasted off by combustion.
Sand scours & pits the porcelain & surrounding metal providing a perfect grip for carbon that hardens by heat and can't be blasted off by combustion. That initial carbon provides a good seat for new carbon & it snowballs causing more frequent maintenance.
Most of us only change or clean plugs after the engine gets hard to start or runs poorly or has pre-ignition and then we procrastinate until it won't start at all or is a PIA to use.
Engines know when you really want to get something done quickly w/o spending a lot time & effort. That's why they go t!ts up right when you need them most to get revenge for all that old gas you've been shoving down their throat, wallowing in mucky oil you were too lazy to change, leaving them out in the rain & snow, overloading and all the other inhuman treatment when they have be busting a gut for you. Up yours.
Will you give your engine a small break from abuse and install new plugs when they're needed? Nooooooooo. You spend 20 mins a plug to pull, blast, gap, and reinstall a marginal piece of crop that going to carbon up twice as fast as a new one. But hey, you saved $2 apiece rignt. No wonder you're engines get pizzed off.
BTW this was all common knowledge way back in the 60's. I can even remember back in the 50's when the real mechanics laughted at it.
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