Posted by Texasmark on April 27, 2023 at 07:01:56 from (147.160.220.127):
In Reply to: hi octane gas posted by tomturkey on April 26, 2023 at 14:03:57:
Not answering the question but related to lead in gasoline, engine deposits and things like burnt valves and short overhaul cycles were a constant problem. Rule of thumb in my neighborhood was valve job in 45k and total overhaul at 100........today its 250k OH (maybe) with valves hanging in there the whole time.
Flat head Ford V8s had bad valve problems and cracking between the valves and cylinder....but that was mostly due to routing of exhaust gasses in the V8 whereby the I4 and I6 didn't have that problem as the exhaust had a clear path to exit......so I have read. My mother had a '51 Ford V8 with the mentioned problems and I had a '36 project V8 Coupe as my first car.....cost me something like $60 in the late '50's.
I understand/think I remember that lead was a cheap way to get the octane boost. I think it Was AMOCO that had white premium fuel without the lead additive. I think the octane ratings were (R+M)/2 unlike todays having the resulting numbers different but not the usefulness......I think (Research measurements + Motor measurements)/2.....whatever that means.
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