Questions tagged [piston-engine]

Piston (reciprocating) aircraft engines are internal combustion engines, similar to the type found in most automobiles. They are typically gasoline powered.

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2answers
80 views

How does engine primer work?

Does anyone have good resources on how piston-engine primers work? Looking for literature, schematics, or better yet, videos. I was told that in carburetor engines, it bypasses the carburetor and goes ...
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Is there an STC for converting the Continental O-470-R to a fuel injected engine?

Is there an STC for converting the Continental O-470-R to a fuel injected engine without making any other changes?
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Why can we not use full throttle in a C172 when cruising at lower altitudes?

My flight training manual (FTM) says that at low altitudes we throttle back our trainers in order to not exceed recommended power settings. But why is that? Is the air close to sea level just too ...
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Why hasn’t the Wankel rotary engine seen more use in aircraft?

The Wankel rotary engine seems to have several advantages over traditional reciprocating cylinder-and-piston designs. In general, they have a much higher power-to-weight ratio, less vibration, and ...
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2answers
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Why, during a magneto check, does manifold pressure increase as RPM decreases?

When performing a magneto check or exercising the propeller prior to take off (constant speed propeller), you notice that as the rpm drops the manifold pressure rises slightly. Why does the manifold ...
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1answer
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Why would a C150's tachometer fluctuate?

Why does a Cessna 150 aircraft tachometer fluctuate between a specific rpm between 800 and 1100 rpm? The idle rpm of the aircraft is 800 rpm.
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1answer
304 views

What is this part on a Cessna 172 engine?

Can any one tell me what this tube with the red is? This is a photo of a 1977 Cessna 172 engine. Looks like the tube is directly connected to the top of the crankshaft.
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Why do aircraft piston engines require priming?

Aircraft piston engines generally require priming, but automobile engines don't seem to need it. Why doesn't cranking the engine with the starter pull in fuel mixture that would ignite without help of ...
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2answers
202 views

Could abrupt flight controls input cause damage in these circumstances?

I went flying yesterday with a friend in my 1972 Grumman AA-5. She's a good copilot for someone who doesn't know much about flying. I showed her how you can pitch up and down, cause 0G, and float, ...
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Would a piston or turbine engine be best suited for a small UAV flying 8000miles?

I am trying to devise a concept that would airdrop medical supplies around remote regions of Africa: vaccines, medicine, blood... etc. I image the payload would be anywhere between 1-2 ton. I think a ...
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Does it ever happen that increasing the prop RPM without moving the throttle actually decreases the thrust and power delivered to the airframe?

A) In an airplane with a piston engine and a constant-speed prop, flying at some given airspeed with the manifold pressure and RPMs in a typical cruise configuration, would it ever happen that ...
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What are examples of power-available and thrust-available curves for piston and turboprop engines, with constant-speed propellers in each case?

Considering the actual thrust or power delivered by the prop to the airframe, what are examples of power-available and thrust-available curves for piston and turboprop engines, with constant-speed ...
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Considering a piston engined aircraft, what resistance pressure would be generated within its engine bay against its cooling intake?

Consider a piston engine with all its coolers and components within an aircraft engine bay. To cool this engine, cooling intakes are positioned facing the direction of flight. Now, the condition at ...
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Why weren’t large, high-power radial engines built to take advantage of the Meredith effect?

Most aircraft piston engines fall into two general categories:1 Radial engines (radials for short2) have their cylinders radiate out from the crankshaft in a star pattern; they tend to have a blunt, ...
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What is an aircraft magneto?

I know that magnetos are related to the engine and that on many planes, they are used to start the engine. But what exactly do they do in the engine?
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What are the different types of procedures for starting a fuel injected engine?

Can someone explain the various types of procedures to start a fuel injected piston engine? What is a cold start, hot start, etc.? I'm referring to a GA aircraft.
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Did people really hand-start big bombers in WWII?

I am not a pilot so I don't know anything about hand starting propeller aircraft. But I wonder how easily can the propeller fire up unexpectedly during the procedure even if it's done right. Whenever ...
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2answers
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Is a 3 horsepower engine powerful enough for a 100 pound ultralight? [duplicate]

I'm building an ultralight and it weighs 100 pounds empty. My only engine is 3HP. Is that good enough?
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What is the method to find the resonance frequency of a PowerFlow exhaust?

I asked a related question about PowerFlow Exhaust systems, which produced another question for me: How do they go about finding the resonance frequency so they know how long to make the exhaust pipe? ...
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2answers
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Why could a Rotax 914 light aircraft lose power at 7000 feet?

I was flying an RV 4 equipped with Rotax 914 engine and variable pitch propeller. The problem was observed during flight above 7000 feet; vertical speed became 0, RPM overshoot for 2, 3 seconds to ...
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982 views

Why does pulling the mixture to idle cutoff increase the RPM slightly?

When adjusting fuel control on a reciprocating engine, why is there a slight RPM rise (50-RPM rise) when pulling the mixture control to idle cutoff? Why if more than a 50-RPM rise, carburetor is set ...
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5answers
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Does the power behind the engine make any difference to how strong the thrust is? [duplicate]

What difference does horsepower make? If the engine can spin the propeller fast enough, why does it need power behind it?
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4answers
225 views

Is it possible to power an ultralight airplane with a single-cylinder weed-whacker engine?

Plane: Weighs 200 pounds. 16 FT wingspan, 36in. by 5 in. airfoil Engine: 3,000 RPM, 2 HP Propeller: 4ft with 4 blades and weighs 4 lbs. Is there perhaps an equation that could determine this?
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How common are gear-driven or belt-driven superchargers in modern aircraft?

How common are gear-driven superchargers in modern piston-engine aircraft, either alone or in combination with exhaust-driven turbochargers? What are some examples of modern aircraft that use them? Is ...
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2answers
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In the modern aviation context, is the word “supercharger” generally assumed to mean a gear-driven system rather than an exhaust-driven system?

In the modern aviation context, is the word "supercharger" generally assumed to mean a gear-driven system rather than an exhaust-driven system? At one time the word "supercharger" often was used to ...
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Is a turbocharged piston aircraft the same thing as turboprop?

Simple question, and I've always assumed that they are the same thing, but I'd like feedback from someone who knows more than me :)
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1answer
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Do ultralights need to have EPA-compliant engines in the USA and Canada?

Do ultralights need to have EPA-compliant engines in: The USA? Canada? Just wondering if you could use a hobby type 2 stroke engine for a twin engine Lazair type ultralight. I don't think they are ...
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Why are engines with carburetors hard to start in cold weather?

Why are engines with carburetors hard to start in cold weather? And why is there a different procedure for hot start scenarios, after you've just shut down the engine and want to power up again?
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1answer
170 views

Where do the compressed gasses of a charged engine goes?

Good day to you here. I'm working on a modified version of 2-stroke engine. My plan is to use a supercharger for the scavenging process, instead of the conventional Crank case scavenging technique, ...
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2answers
378 views

How can I decode Lycoming engine number?

How can I decode Lycoming engine number suffices? What does D3G mean in o-320-D3G or D2A in o-320-D2A? Is there any chart or tabel for decode suffixes?
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Why are two-stroke engines nearly unheard of in aviation?

Almost all aircraft piston engines are four-stroke engines, with one power stroke per piston every other crankshaft revolution and a great deal of intricate moving parts which are only too happy to ...
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What are the durations of strokes and events in a 4-stroke engine?

I'm learning about engines, and I understand the basics of how a 4-stroke engine works, but I've seen lots of true or false questions such as "The power stroke is shorter than the intake stroke" or "...
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1answer
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Is there an actual rated thrust for a Cessna 172 engine at takeoff power?

I could approximate the thrust by knowing the weight of my aircraft and timing the acceleration to takeoff speed, but I think that would be a little dangerous of me as well as only an approximation ...
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What is the metal bit in the front of this propeller spinner?

What is that grey spirally bit in front of the propeller mounted on this Shvetsov ASh-62 radial engine?
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2answers
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Determining total engine life in relation to SMOH/SFOH

When evaluating the value of an aircraft, the total hours since major (or factory) overhaul (SFOH/SMOH) is an important indicator of price since it tells us how many hours the engine has operated ...
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5answers
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C-152 carb heat on before landing in hot weather?

I know the POH for the C-152 explicitly states carb heat should be applied before landing. I fly in a tropical country where temperature is at 30°C on average on the ground, twice the standard temp. ...
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1answer
692 views

Causes of High CHTs

I have a Long EZ with a Lycoming O-320 E2D. It had a complete top-end overhaul two years ago, in June 2017. All four cylinders were relined, and pistons and rings were replaced. Since then the ...
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1answer
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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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2answers
832 views

What is the difference between an engine “shut down”, “cut-off” and “cut down”?

Explain please for non-native speakers the difference between these engine (jet or piston) terms: shut down cut-off cut down I'm studying at a civil aviation university to become a pilot and a ...
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1answer
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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) ...
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2answers
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How is crankcase ventilation handled in R-2800?

I just finished R-2800: P&W's Dependable Masterpiece and noticed there's no mention of a pump for crankcase ventilation. Is this handled by the oil scavenge pumps?
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How do I estimate piston aircraft fuel efficiency?

Is there any way to figure out or calculate fuel consumption of piston engines for aircraft? I'm looking at different engines in a book, and while jet engines have useful values like thrust, bypass ...
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2answers
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Why is the fuel pump in the startup procedure for a Cessna 172?

I thought fuel pumps were reserved for fuel injected planes in startups and during critical flight phases for all planes? However. There are some X-Plane flight tutorials that tells us to use fuel ...
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3answers
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How do carbureted and fuel injected engines compare in high altitude?

I couldn't find enough information on the internet for this topic. What I found can be paraphrased as: Carburetor means easy engine start while fuel injected means manual fuel start up and ...
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2answers
347 views

What modifications are required for automotive fuel STC?

What actual engine modifications are required to allow certificated piston engined general aviation aircraft to run automotive fuel under an FAA Supplemental Type Certificate (STC)?
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1answer
195 views

Why do the Diamond DA-42 and DA-62 have a minimum fuel temperature requirement?

On the turbo diesel DA-42 and DA-62 aircraft there exists a minimum fuel temperature limitation where you may not start or operate the aircraft below that. Does anybody know why this is? It seems ...
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1answer
582 views

Why are piston-engined aircraft generally exempted from U.S. flight recorder requirements?

Most, if not all, of the FAA’s requirements for carriage of flight recorders do not apply to piston-engined aircraft. For instance, 14 CFR 91.609(c)(1) (emphasis added): No person may operate a U....
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Why would a C150 tachometer be sluggish?

After having an issue with a tachometer bouncing so much that it fell off, I now have the opposite problem with the replacement (Mitchell D1-112-5025): The tachometer is sluggish. When I open the ...
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2answers
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What is the blue range indicating on this manifold pressure gauge?

This is baffling me. Does anybody with experience with this type of indicator have any idea what the blue range of this gauge means? It's mounted in a mock-up panel. I know nothing about where it ...
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Why would a cylinder not work below a certain RPM?

We have an IO 540 Lycoming engine, and cylinder #3 doesn't work below 1900 RPM (cold to the touch; EGT and CHT are zero; no vibration). The engine is new, what could be the cause(s)? We cannot ...

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