How Does A Motorcycle Combustion Engine Work?
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- Опубликовано: 30 окт 2017
- Cycle World Technical Editor Kevin Cameron explains the cycle of intake, compression, power, and exhaust, and why pre-ignition and detonation are “worth avoiding.”
Until the electric-vehicle revolution has advanced quite a bit from where it is at the moment, motorcycles remain largely powered by combustion engines. And that means pistons going up and down in cylinders connected to rotating crankshafts by connecting rods.
In the case of a four-stroke engine, it takes two revolutions of the crankshaft to complete the cycle of intake, compression, power, and exhaust. But in two-stroke engines, those same processes all happen within one crankshaft revolution.
Central to both conditions is a piston moving up and down in a cylinder. When the piston rises in the cylinder to compress the mixture of fuel and air above it, a spark plug screwed into the head ignites that mixture. The result is not an explosion. It is simply deflagration.
Combustion begins in the gap of the spark plug. A little flame kernel is then torn to pieces by vigorous air motion in the mixture and that causes a rapid spread of flame. When the flame spreads right out to the edge, the fuel and air are consumed.
Energy is transformed into heat, which causes the pressure of the gas in the combustion chamber to rise. That chunk of energy drives the piston downward on the power stroke. Sometimes that lovely, normal, gradual combustion process goes wrong.
Pre-ignition is exactly what it sounds like: ignition of the fuel-air mixture before the spark. Detonation, which occurs after normal ignition but near the end of combustion, is another type of failure. Both of these are worth avoiding.
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Развлечения
I am here after 4 years and with the ride height devices in motoGP is a testament to the master. kevin has been the foundation to my journey in the automotive field and I work fulltime as a suspension technician now and in my spare time building my own bikes in my parent's basement. its always back to the basics, so the flavour of the year is 2 strokes ofcourse. thank you cycle world.
I think it was Albert Einstein who said "If you can't explain it simply, you don't understand it well enough." Excellent explanation Kevin, many thumbs up. Thanks.
I wished this conversation never ended!
During the early 1980's I learn to read English in part, by High School English classes with teacher Marva but mainly by reading R/T and Cycle World magazines (besides lyrics on Hard Rock LPs and Playboy's...whatever...), one of my favorite sections of Cycle World was Peter Egan's Side Glances and Kevin Cameron's technical explanation of all sort of things happening on a bike.
Today, I just learned something new, thanks to Kevin. On an internal combustion engine flagration and not explosion happens, quite a difference between the two and now I know why... it has to do with speed of burning and pressure.
Thanks Kevin Cameron!
Pablo Céspedes Yes, the same for me, adding another master : Dennis Simanaitis R/T Technical Editor. I 'd like to watch those 3 masters reunited, would be awesome. From Brazil., nice job. 👍👍
....Pre-ignition....VS....detonation.....excellent explanation....!
Well done, wish I knew this fifty years ago. Thank you.
Very well Explained OldTimer. 10 Thumbs up.
Nice video.if I could give more than 1 thumb up I would give 10 for this!
Could you explain why each of these occur? Pre-ignition and detonation. As a bonus question, can you explain the whole warmup process for a common single cylinder motorcycle? Like the reason why a cold engine needs a some mechanism for enrichment to run properly.
very nice!
Where do the 3 aircraft engines live in Kevin's garage?
GOD bless you @ 4:07...
New 2 Strokes do exist. KTM, Yamaha and more.. They are coming back !! Bigly !! Some 2 strokes have valves, some do not..
Total respect to Mr. C . . . .but don’t loop scavenged two-stroke engines have valves?