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Discussion: change advances

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  1. #1
    Banned
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    LOL the eye that the nitromethane ? a molecule is obtained by mixing nitro-glycerine and methanol. Nitroglycerine as such ? very unstable, I figured if they put it in an engine

    Apart from this pleasant digression, to explain is not ? simple, and I realize that to understand can? be equally as difficult. If we add to this the fact that to explain things are not good, we are ruined.

    We feel differently:
    Imagine our web portal allows you to a regime any hypothesis-4000 revolutions per minute.
    Imagine now finish the injection exactly to the upper dead point.
    Hypothesis 1: (random numbers) To burn perfectly the deal? of heating oil that you entered ? need a second 1s
    Hypothesis 2: (random numbers) To open the drain valve to the scheme are required to 1.1 seconds (considering when is the end of the injection phase, which coincides with the top dead point)

    Result: no problem. Everything is running smoothly.

    Let's get in the second case, for example, the injection phase ends 15? ATDC
    Hypothesis 1: (random numbers) To burn perfectly the deal? of heating oil that you have entered (the same as before) ? need a second 1s.
    Hypothesis 2: (random numbers) To open the drain valve to that regime are still needed to be 1.1 seconds, but always from the upper dead point, that is not the same pi? with the phase of end of injection.

    In practice and as if the valve is opened after only 0.9 seconds from the end of injection (random numbers)

    Result: the diesel brucer? still for 0.1 seconds after that ? open the drain valve.

    Really? the situation ? the worst of it as described because? complicated by a number of factors.

    You can improve the thing by throwing air at the storm inside the cylinder, or still better by improving the quality? diesel, by adding molecules that are capable of burning quickly, and by improving the atomization of the fuel.
    The motions of the swirl, in their turn, allow to improve the combustion allowing for a pi? effective mixing of air with fuel. Apart from this, c'? little to do

  2. #2
    THE AVERAGE USER
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    chem .. ? the most beautiful my example!!!!!!!
    In a world of crazy normal is crazy

  3. #3
    THE ACTIVE USER L'avatar di munro
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    doc you are a great and I understood everything perfectly without examples that are difficult to understand(chriswhat you're saying, if I understood well the message ?:inject 50mm3 of diesel at one time with the injection that starts at 20? before tdc and ends at 0? or pms precise ? the same thing to inject 25mm3, and 25mm3 times slightly different but still going to go very close just short of the final time in degrees of fuel injection? maybe when the load of the diesel fuel, and already "pretty hot"???
    I'm not convinced...
    A rider does not create queues even in the car...
    a automoblista create queues even on a motorcycle...

  4. #4
    THE AVERAGE USER
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    my mom... ( DELETED)for the ennesiama time.. you can inject up to a maximum of 10? after tdc..then depends on the configuration of the cams..but the ceiling ? this.


    PLEASE, DO NOT USE OFFENSIVE WORDS AS BY THE RULES AND REGULATIONS!!!
    Last edited by giarras; 09-12-2012 at 10:45
    In a world of crazy normal is crazy

  5. #5
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    Correct, not ? the same thing. To aggravate the matter with two injections subentrerebbero other factors.

  6. #6
    THE AVERAGE USER
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    Citazione Originally Written by Chris156 Visualizza Messaggio
    my mom... ( DELETED)for the ennesiama time.. you can inject up to a maximum of 10? after tdc..then depends on the configuration of the cams..but the ceiling ? this.


    PLEASE, DO NOT USE OFFENSIVE WORDS AS BY THE RULES AND REGULATIONS!!!
    I don't think I have written no word offensive.... the word elimitata ?: AGAIN I SAY TO YOU!!!!!
    Maybe you confused!!!!
    In a world of crazy normal is crazy

  7. #7
    BEGINNER
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    the game is not worth the candle

  8. #8
    THE AVERAGE USER
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    According to me ? to try, you can't? to generalize. The advance can? be either a positive thing or negative, it depends from car to car.
    Assuming that the map is not thrust you can? also, avoid giving advance, then just try the car and see if it makes smoke from 3500 rpm onwards. In principle you do not need to give advance, but then, if you overdo it with the diesel a little ? necessary.
    If by too much you risk breakage very serious and the car tends to not climb well rpm why? the piston starts to find resistance from the date of the start of combustion due to too much advance. According to me ? better to leave that as a last possible change to the advance

  9. #9
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    Citazione Originally Written by emilground Visualizza Messaggio
    According to me ? to try, you can't? to generalize. The advance can? be either a positive thing or negative, it depends from car to car.
    Assuming that the map is not thrust you can? also, avoid giving advance, then just try the car and see if it makes smoke from 3500 rpm onwards. In principle you do not need to give advance, but then, if you overdo it with the diesel a little ? necessary.
    If by too much you risk breakage very serious and the car tends to not climb well rpm why? the piston starts to find resistance from the date of the start of combustion due to too much advance. According to me ? better to leave that as a last possible change to the advance
    Considering that the multiair still do not have them mapped here.

  10. #10
    THE AVERAGE USER L'avatar di puntospeed1.3
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    Citazione Originally Written by emilground Visualizza Messaggio
    According to me ? to try, you can't? to generalize. The advance can? be either a positive thing or negative, it depends from car to car.
    Assuming that the map is not thrust you can? also, avoid giving advance, then just try the car and see if it makes smoke from 3500 rpm onwards. In principle you do not need to give advance, but then, if you overdo it with the diesel a little ? necessary.
    If by too much you risk breakage very serious and the car tends to not climb well rpm why? the piston starts to find resistance from the date of the start of combustion due to too much advance. According to me ? better to leave that as a last possible change to the advance
    then on the low and medium engine speeds can go slower and braking if you give too much? at full load 4500 5000 rpm, 1 that can 1.5 there are; but 1 1.5: example 2500giri are considered to be excessive?

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