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What are the durations of strokes and events in a 4-stroke engine?
What are the differences between Lycoming and Continental engine designs?What are the advantages/disadvantages of diesel/Jet A-1 piston engine?What are the requirements of ferrying a spare engine?What are the differences between a helicopter engine (turboshaft) and an aircraft engine (turboprop)?Why increase the number of cylinders in an engine instead of increasing their volume?Why do piston engines in aircraft burn fuel at a higher rate than a comparable car engine?What is the theoretical maximum RPM of a typical aircraft piston engine?What are the consequences of pumping the throttle in an carburetor piston engine airplane during start?
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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 "The power stroke is longer than the power event". What's the difference between strokes and events, and where can I see more about how long each one takes?
engine piston-engine
asked 8 hours ago
user43890user43890
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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 "The power stroke is longer than the power event". What's the difference between strokes and events, and where can I see more about how long each one takes?
engine piston-engine
asked 8 hours ago
user43890user43890
261 bronze badge
New contributor
user43890 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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3
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You can also check out some of the questions over on Mechanics.SE since your question isn't unique to airplanes.
$endgroup$
– JPhi1618
8 hours ago
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$begingroup$
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 "The power stroke is longer than the power event". What's the difference between strokes and events, and where can I see more about how long each one takes?
engine piston-engine
asked 8 hours ago
user43890user43890
261 bronze badge
New contributor
user43890 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
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 "The power stroke is longer than the power event". What's the difference between strokes and events, and where can I see more about how long each one takes?
engine piston-engine
engine piston-engine
asked 8 hours ago
user43890user43890
261 bronze badge
New contributor
user43890 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
user43890user43890
261 bronze badge
New contributor
user43890 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
user43890user43890
261 bronze badge
New contributor
user43890 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
user43890user43890
261 bronze badge
asked 8 hours ago
user43890user43890
261 bronze badge
261 bronze badge
New contributor
user43890 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
user43890 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
3
$begingroup$
You can also check out some of the questions over on Mechanics.SE since your question isn't unique to airplanes.
$endgroup$
– JPhi1618
8 hours ago
add a comment
|
3
$begingroup$
You can also check out some of the questions over on Mechanics.SE since your question isn't unique to airplanes.
$endgroup$
– JPhi1618
8 hours ago
3
3
$begingroup$
You can also check out some of the questions over on Mechanics.SE since your question isn't unique to airplanes.
$endgroup$
– JPhi1618
8 hours ago
$begingroup$
You can also check out some of the questions over on Mechanics.SE since your question isn't unique to airplanes.
$endgroup$
– JPhi1618
8 hours ago
add a comment
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1 Answer
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The duration of the stroke is simply the time the piston takes to run from the bottom to the top of the cylinder or vise versa, half a rotation. So if the engine is running 2000 rpm, or 33.33 revolutions per second, or 16.66 strokes per second, the stroke duration is .06 seconds, half of one full revolution.
That's the physical mechanical stroke. However the "events" overlap the strokes. Ignition on an aircraft piston engine starts normally around 24 degrees before Top Dead Center, so the power "event" actually starts before the compression stroke is completed. Same with exhaust; the exhaust valve may open slightly before the power stroke is complete (piston not quite at bottom dead center) and the intake valve may open just before exhaust stroke is complete.
This is all done to take advantage of inertial effects of the mass of the air fuel charge. There is a lot of overlap of all these events with the mechanical stroke and is a function of valve and ignition timing, so for a given engine you need to look at a diagram of the timing points for ignition and valve opening/closing for that particular engine.
answered 7 hours ago
John KJohn K
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$begingroup$
The duration of the stroke is simply the time the piston takes to run from the bottom to the top of the cylinder or vise versa, half a rotation. So if the engine is running 2000 rpm, or 33.33 revolutions per second, or 16.66 strokes per second, the stroke duration is .06 seconds, half of one full revolution.
That's the physical mechanical stroke. However the "events" overlap the strokes. Ignition on an aircraft piston engine starts normally around 24 degrees before Top Dead Center, so the power "event" actually starts before the compression stroke is completed. Same with exhaust; the exhaust valve may open slightly before the power stroke is complete (piston not quite at bottom dead center) and the intake valve may open just before exhaust stroke is complete.
This is all done to take advantage of inertial effects of the mass of the air fuel charge. There is a lot of overlap of all these events with the mechanical stroke and is a function of valve and ignition timing, so for a given engine you need to look at a diagram of the timing points for ignition and valve opening/closing for that particular engine.
answered 7 hours ago
John KJohn K
40.7k1 gold badge73 silver badges139 bronze badges
$endgroup$
add a comment
|
$begingroup$
The duration of the stroke is simply the time the piston takes to run from the bottom to the top of the cylinder or vise versa, half a rotation. So if the engine is running 2000 rpm, or 33.33 revolutions per second, or 16.66 strokes per second, the stroke duration is .06 seconds, half of one full revolution.
That's the physical mechanical stroke. However the "events" overlap the strokes. Ignition on an aircraft piston engine starts normally around 24 degrees before Top Dead Center, so the power "event" actually starts before the compression stroke is completed. Same with exhaust; the exhaust valve may open slightly before the power stroke is complete (piston not quite at bottom dead center) and the intake valve may open just before exhaust stroke is complete.
This is all done to take advantage of inertial effects of the mass of the air fuel charge. There is a lot of overlap of all these events with the mechanical stroke and is a function of valve and ignition timing, so for a given engine you need to look at a diagram of the timing points for ignition and valve opening/closing for that particular engine.
answered 7 hours ago
John KJohn K
40.7k1 gold badge73 silver badges139 bronze badges
$endgroup$
add a comment
|
$begingroup$
The duration of the stroke is simply the time the piston takes to run from the bottom to the top of the cylinder or vise versa, half a rotation. So if the engine is running 2000 rpm, or 33.33 revolutions per second, or 16.66 strokes per second, the stroke duration is .06 seconds, half of one full revolution.
That's the physical mechanical stroke. However the "events" overlap the strokes. Ignition on an aircraft piston engine starts normally around 24 degrees before Top Dead Center, so the power "event" actually starts before the compression stroke is completed. Same with exhaust; the exhaust valve may open slightly before the power stroke is complete (piston not quite at bottom dead center) and the intake valve may open just before exhaust stroke is complete.
This is all done to take advantage of inertial effects of the mass of the air fuel charge. There is a lot of overlap of all these events with the mechanical stroke and is a function of valve and ignition timing, so for a given engine you need to look at a diagram of the timing points for ignition and valve opening/closing for that particular engine.
answered 7 hours ago
John KJohn K
40.7k1 gold badge73 silver badges139 bronze badges
$endgroup$
The duration of the stroke is simply the time the piston takes to run from the bottom to the top of the cylinder or vise versa, half a rotation. So if the engine is running 2000 rpm, or 33.33 revolutions per second, or 16.66 strokes per second, the stroke duration is .06 seconds, half of one full revolution.
That's the physical mechanical stroke. However the "events" overlap the strokes. Ignition on an aircraft piston engine starts normally around 24 degrees before Top Dead Center, so the power "event" actually starts before the compression stroke is completed. Same with exhaust; the exhaust valve may open slightly before the power stroke is complete (piston not quite at bottom dead center) and the intake valve may open just before exhaust stroke is complete.
This is all done to take advantage of inertial effects of the mass of the air fuel charge. There is a lot of overlap of all these events with the mechanical stroke and is a function of valve and ignition timing, so for a given engine you need to look at a diagram of the timing points for ignition and valve opening/closing for that particular engine.
answered 7 hours ago
John KJohn K
40.7k1 gold badge73 silver badges139 bronze badges
answered 7 hours ago
John KJohn K
40.7k1 gold badge73 silver badges139 bronze badges
answered 7 hours ago
John KJohn K
40.7k1 gold badge73 silver badges139 bronze badges
answered 7 hours ago
John KJohn K
40.7k1 gold badge73 silver badges139 bronze badges
40.7k1 gold badge73 silver badges139 bronze badges
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You can also check out some of the questions over on Mechanics.SE since your question isn't unique to airplanes.
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– JPhi1618
8 hours ago