Apesar do exemplo ser para um motor de 4 cilindros (automóvel), a maior parte da explicação aplica-se ao motores de motas.
Partilho este vídeo mais pela qualidade da apresentação e simplicidade da explicação
The Differences Between Inline Four & Boxer Four Engines
In this video we are going to be comparing inline four cylinder engines with boxer four cylinder engines, and talking about the individual advantages and disadvantages of each engine layout. We have a 3D printed EJ20 Subaru boxer engine, as well as a 22RE Toyota inline-four engine. We’ll start fairly basic and work our way through several different topics for each layout, including the four strokes, the firing interval and order, the vibrations of each layout, the packaging differences, the cylinder head differences, and finally a bit about the sound.
Looking at either layout, they’re both based on the same four strokes. Intake, compression, power, and exhaust. Both engines fire one cylinder for every 180 degrees of crankshaft rotation, but they have slightly different firing orders. On each engine, we can see cylinders one, two, three, and four. For the boxer engine, the firing interval is one, three, two, four, while on the straight four it’s one, three, four, two, so the order of the last two cylinders firing is switched.
On the boxer engine, you’ll notice the pairs of pistons move in and out together. This means that the primary forces when the piston reaches the top of the cylinder, as well as when they reach the bottom of the cylinder, are canceled out. On the inline four cylinder engine, it’s the same story, the primary forces cancel out as the pairs of pistons reach the top and bottom at the same time.
When we get into secondary forces, however, the engines begin to differ. Secondary forces are created due to the piston traveling faster at the top half of the piston than at the bottom half, something I’ll include a link to in the description for a video that breaks it down in great detail. What you need to know though, is that when the piston reaches the very top of the cylinder, or the very bottom, the secondary force points up or out from the piston. Now with the boxer engine, since the pistons point opposite each other, these forces are balanced out, resulting in a very smooth running engine. For the inline four, all of the forces point in the same direction, and thus do not cancel each other out, causing the engine to vibrate unless balancing shafts are used.
The boxer engine isn’t perfect, however, because the pistons do not perfectly align with each other, it creates a rocking moment which makes the engine want to rotate back and forth along the vertical axis. What’s fascinating, however, is that if you add two cylinders to either of these designs, whether it’s a boxer six or an inline six, you can perfectly eliminate all first and second order forces and moments. You might think the boxer six would have a rocking motion from the cylinder banks of three, but each bank of three cylinders cancels out the rocking motion of the other, unlike in a V6 configuration.
The other biggest advantage of the boxer engine is the low profile, which keeps the center of gravity low and thus reduces the amount of load transfer you have in the car during braking, cornering, or accelerating, which improves grip. With a lower center of gravity, you can also reduce body roll and choose to use softer springs. Additionally, in the event of a collision, it’s easier to position the engine so that it goes underneath the passenger compartment, rather than into the passenger compartment, for improved safety.
That’s not to say the inline four doesn’t have it’s own size advantages. Generally it’s a bit more compact, with only one cylinder head, and it’s not quite as wide as the boxer engine. This leaves more room for suspension geometry, and can also allow for a better steering angle, since the tires won’t have as much of an interference at full lock.
https://youtu.be/mgpDTVBeHOw
Engineering Explained - Motor boxer vs motor em linha
Moderadores: pedropcoelho, LTS, JoseMorgado, amandio, MHQC
Engineering Explained - Motor boxer vs motor em linha
Amândio de Aveiro
(da Madeira, mas em Oslo)
A Zarolha - R1150 GS 2000 [2002-2013]
The Red Devil - K1100RS 1995 [2020-...]
(da Madeira, mas em Oslo)
A Zarolha - R1150 GS 2000 [2002-2013]
The Red Devil - K1100RS 1995 [2020-...]
-
- Membro Veterano
- Mensagens: 2147
- Registado: 22 abr 2014 19:10
- Contacto:
Re: Engineering Explained - Motor boxer vs motor em linha
Bem legal!!
Quanto a mota na minha opinião, o fato de deixar o centro de gravidade mais baixo é uma grande vantagem em relação aos motores "em linha".
Abçs
Luiz
Quanto a mota na minha opinião, o fato de deixar o centro de gravidade mais baixo é uma grande vantagem em relação aos motores "em linha".
Abçs
Luiz
- JoseMorgado
- Moderador
- Mensagens: 6443
- Registado: 23 jan 2008 21:41
- Localização: Lisboa
- Contacto:
Re: Engineering Explained - Motor boxer vs motor em linha
Excelente video!
Quando eu digo que as R's curvam por telepatia, ou seja, basta pensar em curvar, que elas obedecem, aqui está uma das explicações.
Depois de muitas explicações teóricas, nada como umas imagens simples.
Obrigado Amândio!
Quando eu digo que as R's curvam por telepatia, ou seja, basta pensar em curvar, que elas obedecem, aqui está uma das explicações.
Depois de muitas explicações teóricas, nada como umas imagens simples.
Obrigado Amândio!
José Morgado
Sócio 237
R65 78
R100R 92
R1100RS 94
R1200RT 07
R90S 74
R80 G/S 83
R1250 RT 2022
Sócio 237
R65 78
R100R 92
R1100RS 94
R1200RT 07
R90S 74
R80 G/S 83
R1250 RT 2022
- abbocath
- Membro Experiente
- Mensagens: 1499
- Registado: 26 jun 2007 12:03
- Localização: Entroncamento
- Contacto:
Re: Engineering Explained - Motor boxer vs motor em linha
Mais um excelente vídeo Amândio!
Boas curvas
Boas curvas
Rui Peixoto
Sócio 689
R 75/5 1971
K 100 RS 1987
R 1150 GS 2002
Sócio 689
R 75/5 1971
K 100 RS 1987
R 1150 GS 2002
Quem está ligado:
Utilizadores neste fórum: Nenhum utilizador registado e 2 visitantes