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rotorwrench · 05-02-2020, 08:43 AM

Not all aviation engines are low compression. The average aircraft engine is 8.7:1 ratio. I Work on the helicopter engines and one of them is 10:1.

Avgas is expensive due to the chemical make up and cost to refine. Even though it is called 100 Low Lead, it still has a lot of tetra ethyl lead in there. It is way overkill for most auto engines unless they are high compression but it still has a tendency to load the plugs with lead deposits. I get to clean the stuff off every 100 hours. Aircraft plugs are larger so that they have less a tendency to foul to a point where they won't function.

If a person want to use it, I would recommend mixing it with premium Mogas or Mogas with no alcohol of any rating just to make it go farther and further dilute the lead content. It has too much lead for the average auto engine.

05-02-2020, 08:43 AM	#9
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,416	Re: Use of avgas? Not all aviation engines are low compression. The average aircraft engine is 8.7:1 ratio. I Work on the helicopter engines and one of them is 10:1. Avgas is expensive due to the chemical make up and cost to refine. Even though it is called 100 Low Lead, it still has a lot of tetra ethyl lead in there. It is way overkill for most auto engines unless they are high compression but it still has a tendency to load the plugs with lead deposits. I get to clean the stuff off every 100 hours. Aircraft plugs are larger so that they have less a tendency to foul to a point where they won't function. If a person want to use it, I would recommend mixing it with premium Mogas or Mogas with no alcohol of any rating just to make it go farther and further dilute the lead content. It has too much lead for the average auto engine.