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  1. ephraim's Avatar
    ephraim
    ephraim is offline failing college stud
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    January 2nd, 2003 10:57 PM #1
    heres a nifty link for those people who don't know how the diesel engine works.

    http://www.howstuffworks.com/diesel.htm

    heres another link for the gasoline engine.

    http://www.howstuffworks.com/engine.htm
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  2. mikey177's Avatar
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    January 3rd, 2003 09:57 AM #2
    yup, i already read the info there before, but i still can't imagine how air can be compressed to such an extent that it can ignite diesel fuel even without a spark plug. yung glow plugs naman, pang pre-heat lang diba, hindi sya ginagamit sa actual combustion ng fuel? can anyone please explain this feature of diesel engines in greater detail, pls, pls pls.
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  3. boybi's Avatar
    boybi
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    January 3rd, 2003 10:28 AM #3
    the higher air is compressed, the hotter it gets.
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  4. Boy2's Avatar
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    January 3rd, 2003 10:39 AM #4
    when the air becomes compressed it becomes very hot, fuel oil is then sprayed into the cylinder where it ignites spontaneously on meeting the hot air.

    yan lang po ang alam ko e... hope it helps. :wink:
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  5. HBOY's Avatar
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    January 3rd, 2003 10:41 AM #5
    banging of atoms siguro ang effect... the more you compress, the more they bang up at each other generating heat/energy.. hence the explosion.. then again.. what do i know about molecules.. tinulugan ko ata chem class ko eh. eheheh
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  6. tebs's Avatar
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    January 3rd, 2003 12:15 PM #6
    PV=nRT

    eto alam kong relation ng P-pressure, V-volume, T-temperature

    so the higer the pressure, the higher will be the temperature, thus igniting the diesel fuel.

    ps: correct me if i'm wrong
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  7. ephraim's Avatar
    ephraim
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    January 3rd, 2003 12:21 PM #7
    di ko pa rin masyadong maintindihan yung diesel engine. i need someone who can explain it to me.:mrgreen::mrgreen::mrgreen::mrgreen:
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  8. rsnald's Avatar
    rsnald
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    January 3rd, 2003 12:36 PM #8
    Quote Originally Posted by tebats
    PV=nRT

    eto alam kong relation ng P-pressure, V-volume, T-temperature

    so the higer the pressure, the higher will be the temperature, thus igniting the diesel fuel.

    ps: correct me if i'm wrong
    hanef, kemistri 101 na yan a! :lol: yan ang tinatawag na ideal gas equation.

    samahan nyo na kaya ng discussion ng thermodynamics para mas malinaw :lol: :lol:

    tama lahat explanation, pero ang gustong explanation yung kay HBOY. the more you compress, the more the atoms "bang" each other :mrgreen: kaya sila nag-iinit errrrr.. they generate more heat :P

    malinaw na ba? :wink:
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  9. boybi's Avatar
    boybi
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    January 3rd, 2003 12:50 PM #9
    Quote Originally Posted by gestapo
    di ko pa rin masyadong maintindihan yung diesel engine. i need someone who can explain it to me.:mrgreen::mrgreen::mrgreen::mrgreen:
    di ba ang mga substances meron sila kani-kanilang burning point (temperature at which they will start to burn). so sa loob ng cylinders ng isang diesel engine, unang pumapasok ang air (1st stroke), then the air will be compressed upto the burning point of the diesel fuel (2nd stroke), at which point the diesel fuel is injected and ignited/burned by the high temperature air causing the piston to go down (3rd stroke). the 4th stroke simply ejects the ignited air-fuel mixture (the smoke).

    you will also notice that the compression ratio of diesel engines are much higher than gasoline engines. gas engines don't need very hot air to burn the gasoline, they have spark plugs that will do the igniting. the air is just needed for the gasoline to burn.
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  10. HBOY's Avatar
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    January 3rd, 2003 02:33 PM #10
    when you say higher?.. the lower the figure the higher the comp?.. naguguluhan ako eh.. lets say.. 8:1 vs 12:1.. by looking at the figure 8:1 compression is lower unless meron na naman nagbabaligtad nito... wherein some cases the higher the number.. the lower the significance... ewan!...

    sir rsnald,
    ah eh.. oo.. nagiinit nga!..mwhaa....ibang banging naman yan!.. ehehe..
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  11. boybi's Avatar
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    January 3rd, 2003 02:41 PM #11
    12:1 has a higher compression ratio than 8:1. (12 volumes of air compressed into 1 vs 8 volumes of air compressed into 1)
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  12. fierari's Avatar
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    January 3rd, 2003 03:59 PM #12
    eto ang alam ko ah para mapa andar mo ang isang diesel engine kailangan may diesel fuel ang tank mo then start it presto!!!! ehehhehhe :mrgreen:


    dyok lang po peeeps :mrgreen:
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    January 3rd, 2003 04:52 PM #13
    gestapo::: pay more attention when in school! Physics yan.

    tabats::: pare scientist ka pala :D

    hboy, rsnald::: hindi po atoms ang kinocompress dito :D Atoms are incompressible. Hard to explain here :D Boyle's Law should explain all of that :D

    Bagsak po ako ng Thermody1 so dont take my word for it :D
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  14. HBOY's Avatar
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    January 3rd, 2003 05:26 PM #14
    well.. i guess not the atoms but teh space the atoms occupy.. the lessening of teh space increases teh movement and banging of the atoms creating the heat needed for the explosion when the gas molecules start to mix with teh air molecules.... i think.. ehehhe
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  15. ephraim's Avatar
    ephraim
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    January 3rd, 2003 08:44 PM #15
    gestapo::: pay more attention when in school! Physics yan.
    wala pa po kaming physics. general science pa lang po kami :D 4th year pa po yan :D
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  16. mikey177's Avatar
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    January 4th, 2003 11:41 AM #16
    ang galing, na-gets ko din sa wakas. pasensya na po, 1990s pa kasi ako huling pumasok sa classroom e

    so that's why diesel engines are said to be more sturdy than gasoline engines, cuz of the greater compression that goes on inside them?
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