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Ratio of Lead to Gas

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Charlie

06-29-2003 08:13:56




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I have just recently purchased a 1943 Farmall H in pretty good condition. Had to rebuild the Carb and re-wire, that's about it. The guy I bought it from said he was adding lead to the gas, and using non-detergent oil. I didn't think to ask about the ratio. How much lead additive should I be using per gallon of gas?

Thanks




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Bob Kerr

07-01-2003 22:20:19




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 Re: Ratio of Lead to Gas in reply to Charlie, 06-29-2003 08:13:56  
Save your money. Unless you are running a high lift cam with a short duration and with dual or triple valve springs, ressession will just not happen. ressesion happens a lot on some of the old muscle car engines especially the ones that have valve rotators. The amount of lead added during WW2 was very little if any since a lot of the tetra ethyl lead went to aircraft fuels then. Lead was added mostly to prevent knocking in higher compression engines and most tractors are relativly low compression. However on the oil subject, and I am sure this will open a can of worms, but any engine using an oil filter should use a detergent oil. The detergent keeps the crud suspended so the filter can trap it instead of settling in the pan and passages. Since your H had non detergent oil in it, you can #1 keep using non detergent oil , but pull the oil pan off and clean it once in a while or #2 start using a detergent oil and change it and the filter more often the first few changes.

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Hugh MacKay

06-29-2003 15:35:13




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 Re: Ratio of Lead to Gas in reply to Charlie, 06-29-2003 08:13:56  
Charlie: I have two gas Farmalls that haven't seen lead for 30 years. They have a lot of hard work hours on them also. I also had two other gas Farmalls into the late 80s They never saw leaded gas after the early 70s. The tractors we are talking about here are Super A, 130, 300 and Super M. These engine are not high performance, high RPM raceing engines. They are just old gas Farmalls turning for the most part while working between 1000 and 1800 RPM. My opinion the rate of additive depends on how much money you have to waste.

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Steve - IN

06-29-2003 15:58:41




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 Re: Re: Ratio of Lead to Gas in reply to Hugh MacKay, 06-29-2003 15:35:13  
ha ha... good one, Hugh,

I don't use it either on the three tractors I have with old style cast valve seats. I believe the argument regarding valve seat reversion, but figure a lot of other things might do in a tractor engine before that will. A major factor is to keep the valves cool (even if they're not high revving or high compression, they can get hot; and "micro welding" from heat causes the problem), so running just a tad rich is a lot easier way to accomplish a cure.

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Charlie

06-30-2003 03:51:54




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 Re: Re: Re: Ratio of Lead to Gas in reply to Steve - IN, 06-29-2003 15:58:41  
Thanks Hugh and Steve:

I'm still new to this whole process, and I only have 15 acres, probably only 10 of which I will be farming. Right now I'm just practicing not falling off the tractor into the sickle bar mower!

I'm sure I'll be back from time to time with more stupid newbie questions. This is a Great resource!



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Steve - IN

06-29-2003 10:14:10




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 Re: Ratio of Lead to Gas in reply to Charlie, 06-29-2003 08:13:56  
Charlie,

The bottle should give you exact instructions, a lot of lead substitutes have a dosage of 1 ounce to 10 gallons of gas.

The engine's need for a lead substitue will vary with the way you use it. Heavy loads, long running, and lean running require more - light loads, short runs and richer jetting requires less. If you pull the head and have hardened valve seats installed, you won't need a lead substitue at all.

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