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  • Why some two stroke petrol engines need to mix oil in it?

    omprakash patil

    omprakash patil

    @omprakash-Um9Ko0
    Updated: Oct 26, 2024
    Views: 1.6K
    Why some of two stroke petrol engines need to mix oil in it. and some of won't. i drive 2 stroke Yamaha RX 135 with petrol as fuel. but it aint require oil to mix within it.
    I know the whole orientation of 2 stroke and 4 stroke is different as there is no sperate provision of oil sump in 2 stroke as that of 4 stroke engines.
    I guess its good purified petrol itself is self lubricated that it will carry out its performance at desired level .so no need of extra adding of oil is necessary in 2 stroke engines.
    But its not same for all bikes and scooters(old ones).
    Well modern bikes and scooters r 4 stroke now so this question is only for old bikes lover.
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  • Shashank Moghe

    Member • Jun 15, 2015

    Wikipedia says:

    "Unlike four-stroke engine whose crankcase is closed except for its <a href="https://en.wikipedia.org/wiki/Crankcase_ventilation_system" target="_blank" rel="nofollow noopener noreferrer">Crankcase Ventilation System</a>, <a href="https://en.wikipedia.org/wiki/Two-stroke_engine" target="_blank" rel="nofollow noopener noreferrer">Two Stroke Engine</a> use the crankcase as part of the <a href="https://en.wikipedia.org/wiki/Forced_induction" target="_blank" rel="nofollow noopener noreferrer">Forced Induction</a> tract, and therefore, oil must be mixed with <a href="https://en.wikipedia.org/wiki/Gasoline" target="_blank" rel="nofollow noopener noreferrer">Gasoline</a> to be distributed throughout the engine for <a href="https://en.wikipedia.org/wiki/Lubrication" target="_blank" rel="nofollow noopener noreferrer">Lubrication</a>.<a href="https://en.wikipedia.org/wiki/Two-stroke_oil#cite_note-1" target="_blank" rel="nofollow noopener noreferrer">Two Stroke Oil Cite Note 1</a> The resultant mix is referred to as <a href="https://en.wikipedia.org/wiki/Petroil" target="_blank" rel="nofollow noopener noreferrer">Petroil</a>.<a href="https://en.wikipedia.org/wiki/Two-stroke_oil#cite_note-2" target="_blank" rel="nofollow noopener noreferrer">Two Stroke Oil Cite Note 2</a> This oil is ultimately burned along with the fuel as a <a href="https://en.wikipedia.org/wiki/Total-loss_oiling_system" target="_blank" rel="nofollow noopener noreferrer">Total Loss Oiling System</a>. This results in increased <a href="https://en.wikipedia.org/wiki/Exhaust_gas" target="_blank" rel="nofollow noopener noreferrer">Exhaust Gas</a>, sometimes with greyish-blue smoke and/or a distinctive odor."
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