Posted by MarkB_MI on October 04, 2010 at 18:27:10 from (166.217.16.60):
In Reply to: Lead addatives posted by Rustyone on October 04, 2010 at 08:12:42:
The one thing you can be certain about with any of these so-called "lead" additives is they don't contain any lead. Which begs the question "why would you bother?"
There are two things that tetraethyl leads provides (in addition to highly toxic emissions): Improved knock resistance (octane) and better valve life. The low compression ratio of most old tractors means that higher octane is wasted. For engines that need higher octane than regular unleaded, there's premium unleaded.
Now the valve situation is a bit different; one reason avgas still has lead is for better valve life. However, many aircraft engines have run thousands of hours on unleaded fuel with no ill effects. Most aircraft engine builders recommend the use of leaded gas for the first few hours; it's believed that enough lead is deposited on the valves and seats in the first ten hours of operation to last until overhaul. At any rate, there's no evidence that any of the snake oil additives will take the place of lead to protect valve seats; if you're really worried about it add a gallon of avgas to your tank every so often.
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