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  • increase of compression ratio

    vb_austin

    Member

    Updated: Oct 25, 2024
    Views: 856
    can we increase the compression ratio of petrol?will the petrol can be sprayed in two stroke engine.?
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  • blacrobous

    Member • Sep 23, 2009

    if that would have been possible then i dont think they would use carburator for air fuel mixture??
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  • 4d1

    Member • Sep 24, 2009

    vb_austin
    can we increase the compression ratio of petrol?will the petrol can be sprayed in two stroke engine.?
    Higher compression ratios will make gasoline(petrol) engines subject to engine knocking and this will reduce an engine's efficiency or even physically damage it.

    CR in a gasoline/petrol powered engine will usually not be much higher than 10:1 except for engines meant for racing purposes
    racing engines do not have a long life span !!

    p.s.
    *higher compression ratio requires a high octane fuel
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  • vinitk

    Member • Oct 5, 2009

    vb_austin
    can we increase the compression ratio of petrol?will the petrol can be sprayed in two stroke engine.?
    Ans: Increase of compression ratio can lead to knocking.Knocking in petrol engines is pre-ignition of fuel-air mixture(i.e. before the piston reaches the T.D.C. the fuel-air mixture self ignites).
    Octane number of the fuel is the limiting factor.Hence to increase the compression ratio u should use a fuel with higher octane number.

    Nowadays in cars fuel is directly injected into the cylinder by a nozzle.
    Carburation is now obsolete in case of 4 stroke petrol engines.
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  • manju_badri

    Member • Dec 2, 2009

    yes! we can use higher CR in si engines if we use higher octane rating fuel .still it can't be as high as CI engine CR(25:1)
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  • mech.sasikumar

    Member • Dec 3, 2009

    yes, mostly all modern vehicles are having pressurised injectors for spraying petrol inside the cylinder so increasing compression ratio wont affect fuel spray..
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  • namit.sahu

    Member • Dec 3, 2009

    vb_austin
    can we increase the compression ratio of petrol?will the petrol can be sprayed in two stroke engine.?
    by using a nozzle of different types we can increase or decrease the compression ratio..
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