I am very careful here being a very happy new member.
May I suggest a possible answer to the hands on and real observations.
If I may...It is possible that you have witnessed what you have seen because that engine had a problem (what about the mass of others that have not). This going to be hard to describe what I want to get at,
Ok...lets say 1,000,000 engines were made (and they were) out of all the engines out there from the lead gas days how many actually had this problem. It would seem that
all engines would be damaged to truly convict unleaded gas.
Can the problem as described be cuased by race fuel,extreme RPM's with a hot plug gap?
I respectfully wish to bring up these posibilities becuase I am a person that recognizes the curses of assumptions.
So how do I ask a question in type and not sound argumentative...because I am not. I truly believe that anything is possible and if a senario needs cause, focus can sometimes meet be misdirected to meet an explaination much like a survey.
What I mean is this, I am not a Master Mechanic...I am , however an extreemly logical thinker and love problem solving.
D.Hearne said:
... but my having actually seen heads with non-hardened seats with the valves sunk into the heads from extended running on unleaded gas tells me otherwise.
...does this mean that until unleaded gas this had
never ever happened to an engine before. I do not know the answer...but I would like to know because it certainly would "be an interesting answer"
I am a very respectful person and wish to know why this may be a myth...
Why do valves sink into heads...I believe in Murphy's Law...if there is more than one way this can happen then we may have to consider and share these causes in the very least.
Sometimes conviction is misplaced...I wish only to make an appeal on the behalf of unleaded gas.