Quote:
Originally Posted by Easedalenovice
Your theory is incorrect. By far 2 of my boat engines are used the most.
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My theory is only based on the fact that you didn't respond to the question about runtime on the engines, years old is irrelevant. You didn't mention then that 2 are well used and the other 14+ are basically unused. Your sample size goes from 15+ to only 2, so not exactly solid data on the reliability of spark plugs.
In any case, "several times a year" sounds like very light use. At a typical recommended interval of 100 hours on plugs, you'd have to be running it for 3hrs each day for 33 days of the year to reach the recommended plug service interval, and you have 2 (presuming roughly equally used) engines, so you'd have to be on the water for 66 days of the year.
You could easily double that service interval, but it's based on estimated time to failure and going beyond means you're at higher chance of it failing. Even if the plug doesn't fail, a worn plug effects how well the engine runs and starts too.
Quote:
Originally Posted by Easedalenovice
If you have regularly replaced your spark plugs you would have no real experience of how long they last. Same with impellers.
I say again the world cannot afford this sort of waste of resources just because of habit and untested theory
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You say "untested theory" like you're doing some sort of pioneering research into longevity or something. In reality, I'm a mechanic of many years and have seen the real-world effects of people who are lazy with maintenance. Talk of wasting the worlds resources is a bit odd when you're talking of buying even more boats/engines than needed.
Sula
