Posted by jdemaris on October 04, 2010 at 14:44:00 from (67.142.130.20):
In Reply to: Re: Lead addatives posted by buickanddeere on October 04, 2010 at 14:20:05:
Yeah, but you're talking like a Cargo-Cult believer. Many other things were happening when unleaded became the norm. It was about strict EPA regs, Japanese invasion of very reliable cars making fools of US auto-makers, etc.
So, yes - the days of the routine "carbon and valve job" every 60,000 miles are gone. The "lean-burn" Chrysler is also long gone. The auto-makers had to start using much better materials in the valve-train, stricter machining tolerances, computer controlled fuel injection, etc. So today, we've got all new engines (that I know of) with CPU monitored fuel injection, roller cams, super hard valve and valve seats, very durable valve guides, tight valve seals, hotter running engines, computer-monitored ignition timing and somtimes valve timing, small and many small valves instead of fewer bigger ones . . . and motor oil fuel with less deposit-creating additives, etc.
Much of these newer improvements have little to do with old farm tractors. That except modern motor oil for highway vehicles is ill-suited for older farm tractors with flat-tappet camshafts.
Seems what happens is - some change gets made, people freak out when it happens on both sides of the argument, but eventually the old equipment gets phased out, and people assume there never was a problem to start with.
When leaded fuel first got dropped in the USA, replacement additives were being put in most blends of unleaded gasoline to forgo any potential problems. This is still done in many countries.
Same thing is going on now with low-sulfur diesl fuel in the USA and Canada. All of it gets lube additives put in to help make it more suitable for older mechanical pumps and injectors. At some point in time, I bet the use of those lube additives will stop and anybody left driving a 25 year old diesel (or more) will have to fend for themselves. Then many will say there never was a problem and it was all BS.
I will say this. In the good-old days of leaded fuel and low-tech engines, many had to be pulled apart due to excess carbon build up. Now, running on cleaner fuel - who knows what will go first instead?
Kind of funny when you read old British tech manuals. They often warn, that when you have the heads off the engine, NOT to scrape out all the carbon. They say to leave a ring of carbon aroud the edge of the piston-top to aid in compression. But what the heck did they know? They built MGs, Sunmbeams, Austin Healys, and Triumphs that rarely lasted 40K miles.
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