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Re: Re: Re: Re: Re: Old engines (pre 1970) and gasoline, leaded - unleaded
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Posted by Salmoneye on January 04, 2002 at 04:50:19 from (207.40.137.86):
In Reply to: Re: Re: Re: Re: Old engines (pre 1970) and gasoline, leaded - unleaded posted by Bill Jones on January 03, 2002 at 19:01:20:
I should not have said that TEL was added to 'retard' octane...Poor choice of words on my part. What I meant by 'retard' was that it was added to increase octane in order to 'retard' detonation which of course means an increase in octane rating. 'Knocking' is the common term for 'pre-ignition' or 'detonation' which is the act of the fuel air mixture literally igniting itself from the action of compression before the spark. 'Pinging' is the act of the valve faces microwelding to the seat and literally ripping away some of the metal upon opening. This is what you are calling 'burning'. I have never heard anyone say that the 'burning' was caused by TEL. The distillates you are speaking of (other than Kero) were pretty much out of the loop after the mid to late 20's in the US, so unless you have a very old tractor, I would not be worrying much. Read the link in my post above for the info on Kettering, Engine Knock and the 'discovery' of Tetra-Ethyl Lead, and read the Porche article at the link below on Micro-Welding of Valve Seats...
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