Questions tagged [mixture]

The mixture ratio of an engine is the amount of air used for burning a given quantity of fuel; spark-ignition piston engines use different mixture ratios for different phases of flight.

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9
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4answers
1k views

How does the DA 40 NG automatically control the mixture, pitch and power by just providing one throttle?

I'm a student pilot and here at my school we have the older gen DA40s which have individual lever for mixture, pitch and power. I was looking at this video of the DA40 NG, and got quite curious as ...
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1answer
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What is the air/fuel mixture ratio in a turbojet engine?

How does it relates to stoichiometry ? What are the possible extinction accidents related to air/fuel mixture ratio ?
6
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1answer
640 views

Does the mixture and throttle setting affect the quality of priming of fuel prior to start?

This question is a generality. For airplanes with small reciprocating engines, does the mixture and throttle setting at the time of priming affect the quality of the priming or the engine start, or ...
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1answer
406 views

How do you lean mixture using only the instruments on a C172 Skyhawk?

POH manuals always tells to use the voice of the engine as a reference. (Which complicates things a little bit since carbs and fuel injected planes have different "reaction times" for each cylinder) ...
7
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2answers
761 views

Why does enriching the mixture ratio beyond stoichiometry give more power?

In other words, in a piston engine, the best-power mixture is richer than that producing the EGT peak that signals stoichiometric combustion. Why is that, physically?
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1answer
368 views

How to lean with constant speed prop on multi-engine aircraft without EGT

This question is more about the indication of engine roughness. The procedure for leaning without an EGT is clear in the POH and Lycoming documentation which basically states as follows: Best power: ...
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2answers
685 views

Do Diesel engines have a mixture option?

Consider the DA-42, it has no mixture control. Is that because it is run on Jet-A/diesel? Or is the mixture control automated?
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0answers
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What variables is an engine's AFR based on?

Maybe this is a bit too technical for an aviation forum, but it specifically concerns a flight engine.(Rotax 912 iS) Road vehicle engines will probably have different behavior. As you may know, the ...
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3answers
6k views

Rotax engines have no mixture control, how do they handle less dense air?

Rotax engines have no mixture control, yet they don't seem to have any more problems than other engines at altitude. How do they handle the lower air density in order to not get a too rich a mixture?
18
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3answers
36k views

How does the mixture of an engine affect the engine's operation?

I know that in most piston aircraft that there is a mixture control for the engine. My question is, how does the mixture control affect the engine's operation and what type of situations dictate a ...