I'm aware of all that and don't need more education on the subject. I don't need to get older either, but it's apt to happen. 7/8 of my life is already used up and I'm in no hurry to use the rest.
Why do you think cars built 1902-and a little "newer" had hand-operated timing-advance controls?
Why do you think cars used to get "carbon and valve" jobs as routine maintenance?
Over-advanced timing, overly high compression-ratio, too lean a mixture, and/or low octane fuel can cause detonation. But it won't cause piston skirts to melt as I already mentioned. Skirts melt from lack of lube or lack of clearance. Big difference between problems on the thrust side of the piston, and problems on the top of the piston. The former is not in the combustion chamber.
Detonation has been around as long as internal combustion engines have existed. The causes we see today aren't much different.
At least in a car built 100 years ago, the operator could control the detonation with a simple hand-control. Too bad Chrysler didn't have something to stop detonation on their "electronic lean burn" engines in the 70s.
I'll say it again and stick by it. I've seen very few chainsaws with detonation problems. Do they exist? Well yeah, I'm sure they do. Especially with newer saws that are probably running higher compression ratios then in the past. I rarely work on the newest and the "greatest" stuff, so what I see the inside of - is often 15-50 years old (with chainsaws).
On older saws, for the most part, I've seen it in saws that were converted to breaker-less ignition with cheap kits that resulted in overly advanced timing. Other then that, most piston wear problems have been from lack of lube, too little clearance, debris, or overheating. The latter results in a combination of much of the aforementioned.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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