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Can you use AvGas for an octane booster in a regular gasoline engine with no catalytic converter?
I've been wondering, I know avgas is a low lead 100 octane fuel that would ruin your engine if you use it alone without changing ports or carborator. But is it possible to use it as an octane booster in like a 50:1 mix for example?
3 Antworten
- RobertLv 5vor 6 Jahren
Even if it weren't for the lead issues, you would see no benefit in the typical automotive engine in running 100 octane aviation fuel. Octane is not a measure of how much energy a fuel has. It is a measure of how resistant the fuel is to preignition - the higher the octane, the less likely the fuel is to ignite on the compression stroke prior to the spark plug igniting.
You'd only see a benefit from higher octane fuel if you increased the cylinder pressure, either by forced induction or a higher compression ratio. Even then, it is the higher cylinder pressures that create the power. The higher octane just means the fuel can take the added stress of the extra pressure.
In a completely stock car in good condition, rated for 87 octane, running 100 octane av gas will give you no improvement in horsepower.
- vor 6 Jahren
100LL has far more lead in it than unleaded auto fuel - up to 2000 times more lead! (up to 2 grams per gallon vs .001 grams per gallon). So what you would face is lead fouling of the spark plugs, lead deposits on the valves and valve seats and lead contamination of the catalytic converter, so it's not worth using it as an octane booster unless the engine was one originally designed for leaded fuels (pre-1986).
- Anonymvor 6 Jahren
Not a good idea. Avgas has far too much lead in it and would foul plugs, exhaust valves and seats and gets into the oil and fouls things like fuel pump drives and bearings.
It is particularly hard on oil seals that are not designed for lead and on anything using ball bearings, such as camshaft gear trains, if the engine has such a device.
As an illustration, a Rotax 912 engine, running on un-leaded auto-gas has a service period of 100 hours and a TBO of 2000 hours.
Put more than 20% 100LL Avgas through it and the service period drops to 50 hours, including de-leadingthe reduction gears and the TBO drops to 1400 hrs. In other words, you nearly double your servicing cost.
Expect the same if you use 100LL in an engine designed for un-leaded fuel, no matter the mix.
