Page 1 of 2 12 LastLast
Results 1 to 20 of 22

Thread: What does a 3.0,4.0,5.0..... litre engine really mean?

  1. #1
    Carsightings's Avatar
    Join Date
    Dec 25th, 2005
    Location
    Israel
    Posts
    1,017
    Rep Power
    0

    What does a 3.0,4.0,5.0..... litre engine really mean?

    i know the bigger the capacity the better the horsepower and torque ouput but what does the litre bit mean? i hope you understand my question
    ____________________________


    Some one has been fucking with my profile.

  2. #2
    Aced mod training! mgkdk's Avatar
    Join Date
    Mar 19th, 2005
    Location
    Denmark
    Age
    34
    Posts
    6,116
    Car(s)
    Volvo V40
    Rep Power
    198
    It's how much space there are inside the cylinders where the pistons are, check wikipedia on how the four stroke engine works.

    Just ask if you need more explanation, then I'll find my dictionary
    ____________________________
    "Danish is cool" - Jeremy Clarkson
    "Danish things are usually awesome." - LeMans GTR

  3. #3
    Carsightings's Avatar
    Join Date
    Dec 25th, 2005
    Location
    Israel
    Posts
    1,017
    Rep Power
    0
    i didnt understand much from there sorry.

    could you explain?
    ____________________________


    Some one has been fucking with my profile.

  4. #4
    fluke667's Avatar
    Join Date
    Nov 1st, 2004
    Location
    Stuttgart - Germany
    Age
    40
    Posts
    1,134
    Car(s)
    BMW 523i
    Rep Power
    35
    ____________________________

  5. #5
    Aced mod training! mgkdk's Avatar
    Join Date
    Mar 19th, 2005
    Location
    Denmark
    Age
    34
    Posts
    6,116
    Car(s)
    Volvo V40
    Rep Power
    198
    Sure

    The engine is made up of a number of cylinders. In the cylinder the piston moves up and down accordingly to the stroke.
    In a normal four stroke engine there are 4 strokes happening in the cylinders: Intake, where air and waporized fuel is sucked in the cylinder through the walves; compression, where the mixture is compressed; combustion, where the sparkplug ignites the mixture (this is the stroke that creates power); exaust, where the exaust is pushed out of the cylinder.
    In an engine with 4 cylinders each cylinder does a different stroke at any given time.
    When the engine does one rotation there has happend 2 strokes.
    The pistons are connected to a crankshaft that transforms the up/down motion to a rotation, that is the thing that makes the car move.
    The litre number is the combined volume of all the cylinders in the engine.
    ____________________________
    "Danish is cool" - Jeremy Clarkson
    "Danish things are usually awesome." - LeMans GTR

  6. #6
    Carsightings's Avatar
    Join Date
    Dec 25th, 2005
    Location
    Israel
    Posts
    1,017
    Rep Power
    0
    wow! thats very good

    thanks!

    where is it from?
    ____________________________


    Some one has been fucking with my profile.

  7. #7
    Aced mod training! mgkdk's Avatar
    Join Date
    Mar 19th, 2005
    Location
    Denmark
    Age
    34
    Posts
    6,116
    Car(s)
    Volvo V40
    Rep Power
    198
    The thing I wrote? It's from my head
    ____________________________
    "Danish is cool" - Jeremy Clarkson
    "Danish things are usually awesome." - LeMans GTR

  8. #8
    jensked's Avatar
    Join Date
    Mar 31st, 2005
    Location
    Flanders, Belgium
    Age
    31
    Posts
    4,052
    Car(s)
    2006 Toyota Corolla Wagon
    Rep Power
    26
    Quote Originally Posted by Carsightings
    where is it from?
    It is a she and she's from denmark.

    err. right. never mind.

    what I don't understand is the relationship between volume and bhp. the more liter, the more bhp? how does that work?
    ____________________________

  9. #9
    Aced mod training! mgkdk's Avatar
    Join Date
    Mar 19th, 2005
    Location
    Denmark
    Age
    34
    Posts
    6,116
    Car(s)
    Volvo V40
    Rep Power
    198
    Quote Originally Posted by jensked
    what I don't understand is the relationship between volume and bhp. the more liter, the more bhp? how does that work?
    I think it's a combination of things, like a 2 litre 1 cylinder engine wouldn't have as much power as a 2 litre 4 cylinder engine because it would loose some power in the 3 strokes when it isn't producing power. Did that make sence
    ____________________________
    "Danish is cool" - Jeremy Clarkson
    "Danish things are usually awesome." - LeMans GTR

  10. #10

    Join Date
    Jan 5th, 2005
    Location
    Belgium
    Posts
    464
    Rep Power
    0
    Quote Originally Posted by jensked
    what I don't understand is the relationship between volume and bhp. the more liter, the more bhp? how does that work?
    The bigger the cylinders are, the more fuel and air you can inject. So you have a greater combustion. Therefore, when you have bigger cylinders you have more torque (with the same engine that is). It's not only the displacement that determines the amount of torque (hp is dirived from torque, and torque is the more important figure) though (difficult matter).

    Greetz Johan

  11. #11
    M3lover's Avatar
    Join Date
    Nov 23rd, 2005
    Location
    The milkyway, Earth, Denmark, Copenhagen
    Age
    28
    Posts
    1,657
    Car(s)
    '10 Ford Fiesta 1,4 TDCi
    Rep Power
    23
    Ok, very basic explanation. In a bigger engine bigger explotions of fuel can happen. Bigger explotions = More power. There is ofcourse, as you can see on the data sheets more to it than that. For example how precise the engine can handle the combustion and so on. The explotions can be made more powerful by adding more air to it with turbos and superchargers or compressors.

  12. #12
    Hormone Induced BerserkerCatSplat's Avatar
    Join Date
    Jun 21st, 2005
    Location
    Alberta, Canada
    Posts
    8,615
    Car(s)
    The Jeep of Theseus
    Rep Power
    171
    Another way to increase HP is to increase what's called the "compression ratio" of the engine.

    The "compression ratio" of an engine is basically how much it compresses the air/fuel mixture before combustion.

    Let's say you have a 8L V8 engine. That means that each cylinder's combustion chamber is 1L in size at the bottom of the piston stroke (aka Bottom Dead Center). Now, if the piston moves upwards to the top of its stroke (Top Dead Center) and the size of the combustion chamber has been reduced to 0.1L, you can say that the engine has 10:1 compression, as the compressed mixture is one tenth the size of the uncompressed mixture.

    Most engines run about 8-9:1 compression, but the more compression you run, the more power you get from the same amount of air&fuel. However, high compression is very hard on engines and can lead to detonation.
    ____________________________
    OSPhoto

  13. #13
    Brazilian Consultant Redliner's Avatar
    Join Date
    May 19th, 2005
    Location
    Brazil - South America
    Age
    34
    Posts
    15,466
    Car(s)
    2013 Palio Sporting
    Rep Power
    680
    Quote Originally Posted by mgkdk
    The thing I wrote? It's from my head
    Girl.....check
    European....check
    Good-looking....check
    Smart.....check
    Knows about cars....check
    [Kneeling] Would you marry me?
    ____________________________
    Der Wahnsinn ist nur eine schmale Brücke. Die Ufer sind Vernunft und Trieb.

  14. #14
    YF19pilot's Avatar
    Join Date
    Apr 15th, 2005
    Location
    Massillon, OH
    Age
    30
    Posts
    2,768
    Car(s)
    2006 Honda Civic Coupe
    Rep Power
    46
    Quote Originally Posted by BerserkerCatSplat
    Another way to increase HP is to increase what's called the "compression ratio" of the engine.

    The "compression ratio" of an engine is basically how much it compresses the air/fuel mixture before combustion.

    Let's say you have a 8L V8 engine. That means that each cylinder's combustion chamber is 1L in size at the bottom of the piston stroke (aka Bottom Dead Center). Now, if the piston moves upwards to the top of its stroke (Top Dead Center) and the size of the combustion chamber has been reduced to 0.1L, you can say that the engine has 10:1 compression, as the compressed mixture is one tenth the size of the uncompressed mixture.

    Most engines run about 8-9:1 compression, but the more compression you run, the more power you get from the same amount of air&fuel. However, high compression is very hard on engines and can lead to detonation.
    However, detonation -- or knocking -- can be circumvented by running higher grades of gasoline. The grades or ratings of gasoline are a referance to the ability of the gasoline to not prematurely detonate when compressed. That's why high end sports cars require high end fuel. If you were to put 87 into a Ferrari, you'll probably end up with a $200,000 paperweight...


    Yes, Beserker, I realize you probably already know this, but this is more for the education of others who are unfimilar with auto termanology...
    ____________________________

  15. #15
    "bangle for president" bone's Avatar
    Join Date
    Jan 14th, 2004
    Location
    belgium!!
    Age
    30
    Posts
    13,462
    Car(s)
    BMW 116d & Yamaha Banshee
    Rep Power
    165
    this is written in the explanation of the veyron on howstuffworks.com, i taught it explained quite clearly how they got 1000hp out of petrol, and how hard it actually is, and also explains jensked's question

    * 1,000 horsepower is equivalent to roughly 2.6 billion joules per hour. A gallon (3.8 liters) of gasoline contains 132 million joules, so a 1,000-hp engine has to be able to burn just over 20 gallons of gasoline per hour.
    * However, car engines are only about one-quarter efficient -- three quarters of the gasoline's energy escapes as heat rather than as power to the wheels. So the engine actually has to be able to burn at least 80 gallons per hour, or 1.33 gallons (5 liters) per minute.
    * Let's convert over to metric. Gasoline requires about 14.7 kilograms of air to burn 1 kilogram of gas. Air weighs 1.222 kilograms per cubic meter at sea level. A gallon of gasoline weighs 2.84 kilograms. So the engine has to be able to process 2.84*1.33*14.7 kilograms of air per minute, or roughly 45 cubic meters of air per minute. That's 45,000 liters of air per minute.
    * If a V-8 engine is turning at 6,000 rpm, it can inhale a total of 24,000 cylinders' full of air per minute. If it needs to inhale 45,000 liters of air per minute, it works out to roughly 2 liters per cylinder-full. That's a 16-liter engine.

    We need a 16-liter engine to burn 1.33 gallons of gas per minute. That actually makes sense -- the engine in the Dodge Viper is 8.0 liters in displacement and produces 500 hp.

  16. #16
    SiR_dude's Avatar
    Join Date
    Mar 5th, 2004
    Location
    Somewhere in rural Ontario, Canada
    Posts
    3,639
    Car(s)
    2000 Civic SiR
    Rep Power
    25
    Quote Originally Posted by YF19pilot
    Quote Originally Posted by BerserkerCatSplat
    Another way to increase HP is to increase what's called the "compression ratio" of the engine.
    ...

    Most engines run about 8-9:1 compression, but the more compression you run, the more power you get from the same amount of air&fuel. However, high compression is very hard on engines and can lead to detonation.
    However, detonation -- or knocking -- can be circumvented by running higher grades of gasoline.
    That's how Honda managed to squeeze 160 HP out of the 1.6L in my car...10.2:1 ratio. And that's also why I put at least 91 octane in my car.

  17. #17
    YF19pilot's Avatar
    Join Date
    Apr 15th, 2005
    Location
    Massillon, OH
    Age
    30
    Posts
    2,768
    Car(s)
    2006 Honda Civic Coupe
    Rep Power
    46
    You know, maybe we should sticky this thread and direct people who are unfamiliar with automobiles and their workings to this thread, sort of like an unofficial faq about cars.
    ____________________________

  18. #18
    "bangle for president" bone's Avatar
    Join Date
    Jan 14th, 2004
    Location
    belgium!!
    Age
    30
    Posts
    13,462
    Car(s)
    BMW 116d & Yamaha Banshee
    Rep Power
    165
    Quote Originally Posted by YF19pilot
    You know, maybe we should sticky this thread and direct people who are unfamiliar with automobiles and their workings to this thread, sort of like an unofficial faq about cars.
    there have already been a few threads about that made
    i tried to explain superchargers: http://forum.finalgear.com/viewtopic...760&highlight=
    i had a question about diesel engines, and later found a super read about them: http://forum.finalgear.com/viewtopic...747&highlight=
    a superb read about rotory engines: http://forum.finalgear.com/viewtopic...265&highlight=
    a thread about a 6 stroke engine (and some others): http://forum.finalgear.com/viewtopic...268&highlight=
    josty explaining turbos: http://forum.finalgear.com/viewtopic...744&highlight=
    josty had a question about diffs, and i tried to explain (agian): http://forum.finalgear.com/viewtopic...900&highlight=

    we need more discussions in this direction
    much more interested in stuff like this than what brand released which car

  19. #19
    Hormone Induced BerserkerCatSplat's Avatar
    Join Date
    Jun 21st, 2005
    Location
    Alberta, Canada
    Posts
    8,615
    Car(s)
    The Jeep of Theseus
    Rep Power
    171
    Quote Originally Posted by YF19pilot
    Quote Originally Posted by BerserkerCatSplat
    Another way to increase HP is to increase what's called the "compression ratio" of the engine.

    The "compression ratio" of an engine is basically how much it compresses the air/fuel mixture before combustion.

    Let's say you have a 8L V8 engine. That means that each cylinder's combustion chamber is 1L in size at the bottom of the piston stroke (aka Bottom Dead Center). Now, if the piston moves upwards to the top of its stroke (Top Dead Center) and the size of the combustion chamber has been reduced to 0.1L, you can say that the engine has 10:1 compression, as the compressed mixture is one tenth the size of the uncompressed mixture.

    Most engines run about 8-9:1 compression, but the more compression you run, the more power you get from the same amount of air&fuel. However, high compression is very hard on engines and can lead to detonation.
    However, detonation -- or knocking -- can be circumvented by running higher grades of gasoline. The grades or ratings of gasoline are a referance to the ability of the gasoline to not prematurely detonate when compressed. That's why high end sports cars require high end fuel. If you were to put 87 into a Ferrari, you'll probably end up with a $200,000 paperweight...


    Yes, Beserker, I realize you probably already know this, but this is more for the education of others who are unfimilar with auto termanology...
    Don't worry, I do know that - but this thread is for the benefit of the people that don't. Thus, I'm sure your input is valuable to them.
    ____________________________
    OSPhoto

  20. #20
    YF19pilot's Avatar
    Join Date
    Apr 15th, 2005
    Location
    Massillon, OH
    Age
    30
    Posts
    2,768
    Car(s)
    2006 Honda Civic Coupe
    Rep Power
    46
    Quote Originally Posted by bone
    Quote Originally Posted by YF19pilot
    You know, maybe we should sticky this thread and direct people who are unfamiliar with automobiles and their workings to this thread, sort of like an unofficial faq about cars.
    there have already been a few threads about that made
    i tried to explain superchargers: http://forum.finalgear.com/viewtopic...760&highlight=
    i had a question about diesel engines, and later found a super read about them: http://forum.finalgear.com/viewtopic...747&highlight=
    a superb read about rotory engines: http://forum.finalgear.com/viewtopic...265&highlight=
    a thread about a 6 stroke engine (and some others): http://forum.finalgear.com/viewtopic...268&highlight=
    josty explaining turbos: http://forum.finalgear.com/viewtopic...744&highlight=
    josty had a question about diffs, and i tried to explain (agian): http://forum.finalgear.com/viewtopic...900&highlight=

    we need more discussions in this direction
    much more interested in stuff like this than what brand released which car

    You know, I think I'll start like a weekly technology discussion. Like "Cars 101" something that'll be beneficial to this site and that I can also have in my blog/magazine thing, and also give people something to read and discuss in the Q&A forums. I'll note your links and this one in the bottom for people to referance.
    ____________________________

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •