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Antique Gas Engine Discussion

Off topic a little - unleaded gasoline


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Old 12-31-2004, 10:59:27 AM
Bruce Sutton Bruce Sutton is offline
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Default Off topic a little - unleaded gasoline

When were car engines made to use unleaded gasoline and was the difference only the valve seats?
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Old 12-31-2004, 12:30:43 PM
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Ken Majeski Ken Majeski is offline
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Default Re: Off topic a little

There has been Many articles written about this... BUT... Early cars were all made to use unleaded Gasoline... Then Tetryethl Lead was discovered as an Antiknock compound in the 1930's and used untill it was discovered to be hazordous. And in the early 70's it was removed from common gasoline. Dates may not be exact but you get the message. A web search will yield Tons of Info...
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Old 12-31-2004, 06:02:44 PM
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Craig A Craig A is offline
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Default Re: Off topic a little

I have always heard that the Lead was also supposed to help lubricate the valve stems (especially the exhaust valve stems) as well as act as a sort of "cushion" for the seats. That's why they use hardened seat inserts now...well...that and a LOT longer life too.
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Old 12-31-2004, 06:29:02 PM
landlockedmarine landlockedmarine is offline
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Default Re: Off topic a little

Just a quick thought around this subject. Marine gas ("white gas" or so it was called) was unleaded fuel. 2 Stroke engines never needed lead. Lead would only be another deposit in the exhaust ports. Leaded gas was never recommended for outboards.
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Old 12-31-2004, 07:45:19 PM
ldj1002 ldj1002 is offline
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Default Re: Off topic a little

Yea, I remember that white "boat gas" as we called it and it was a lot cheaper too. As a kid we used to put it in our car and couldn't tell the difference. Now when we were really broke we put kerosene in. As long as you could stand the smoke and never shut it off and let the engine get cold before you put some more boat gas in it was ok. Well at least the kerosene would get us where we wanted to go when we didn't have money for that good ole boat gas.
Oh!, those memories.
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Old 01-01-2005, 11:18:06 AM
C Pratt
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Default Re: Off topic a little

My dad got mad and quit driveing when they charged more to take it out, he was 94 and said he rememberd when they charged more to put it and thats all i know about that.
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Old 01-01-2005, 01:23:20 PM
BobRR BobRR is offline
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Default Re: Off topic a little

Happy New Year everyone!!All these old gas engines were made to run on white gas.I was taught not to put leaded fuel in my hit&miss but to run coleman fuel when ya couldnt find white gas. BobRR
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Old 01-05-2005, 10:05:27 PM
Richard W. Richard W. is offline
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Default Re: Off topic a little

The older auto engines (70's back to ?) just used the cast iron head for a seat. When they took out the lead, some manufactures inductioned hardened the seat. Other manufacturers put in hardened seats. Both manufacturers used stainless steel valves for unleaded engines. The older leaded engines would run for about 70,000 miles before needing the valves reground. This is according to an article I read years ago. I don't remember where I read it. Any way when they quit making leaded fuel most of those engines already had more than that on them any way.
If you are rebuilding one of those engines it's a good idea to have the hardened seats put in along with the stainless valves.
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