Blending of 0.5% MTBE With Petrol in Single Cylinder Two Stroke Petrol Engine

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Blending of 0.5% MTBE With Petrol in Single Cylinder Two Stroke Petrol Engine

Harsh Soneji1, Kapil Raval2, Jaymin Thakkar3 , Indravadan Zala4

1,2,3,4 Dept. of Mechanical Engineering, Government Engineering College, Patan, GTU, Gujarat, India

Abstract: Improving Internal Combustion (IC) engine efficiency is a prime concern today. A lot of engineering research has gone into the improvement in efficiency, By using additives and blending it with gasoline improve engine performance. In this work, oxygenated additives like methyl tert butyl ether (MTBE) are identified for the experimental investigation by blending it to 0.5% with gasoline. The performance analysis was examined in single cylinder two stroke petrol engine with additives blend with gasoline.

Key Words: MTBE (Methyl tert butyl ether), blending, Tachometer, two stroke engine, Brake Dynamometer


    Engine performance is measured with 0.5% blended MTBE with petrol with use of brake dynamometer. The two stroke petrol engine test ring has two-stroke single cylinder air cooled petrol engine by Bajaj, brake dynamometer apparatus, fuel measurement apparatus and tachometer apparatus are available with test kit.


    MTBE: -Methyl tert butyl ether


    Single cylinder two stroke air cooled petrol engine

    Made by: Bajaj Auto, 150cc power 7.5BHP @ 5500rpm, torque 10.8NM @3500rpm

    Engine weight: 103kg Tachometer

    Type: electrical type (RPM) Fuel measurement tank

    Mounted on a sturdy iron stand, burette tube and two valve connections.

    Capacity: 4 liter Stopwatch

    Table -1: Properties of MTBE


    Methyl tert butyl ether

    Molecular formula


    Octane number


    Molecular weight (g/mol)


    Boiling point (°C)


    Oxygen content (% wt)


    Vapor pressure (mmHg at 25°C)


    Table -2: Physical and chemical properties of petrol, MTBE



    Methyl tert butyl ether

    Specific gravity



    Kinematic viscosity



    Flash point(°C)



    Fire point (°C)



    Pour point (°C)



    Gross calorific value (kJ/kg)



    Acidity as mg of KoH/gm



    Density@ in gm/cc




In theoretical cycle, we assume that there is no friction loss or exhaust gas loss, there is no variation sp. heat of gases with temperature. Therefore, the efficiency of cycle is independent of these. But in actual cycle on which the engine works must depend on these factor and due to these losses the efficiency of the engine is less than that of theoretical cycle. Engines are required to be tested mainly for on a purposes the basic measurements which usually should be undertaken to evaluate the performance of an engine are

  • Brake power

  • Total fuel consumption

  • Brake thermal efficiency

  • Friction power

  • Indicated power

  • Indicated thermal efficiency

  • Mechanical efficiency

    1. Procedure:

      1. Check the level of mixture of petrol and 2T oil because in two stroke petrol engine lubrication is giving to engine directly with petrol.

      2. Start the engine by kick with no load.

      3. As the engine start continue for two minutes.

      4. Put a light load in the engine with loading screw.

      5. Achieving steady state condition, note down all the necessary data (fuel consumption, brake drum speed with tachometer.)

      6. After noting down repeat the step 4 and 5 for different load.

      7. Now add mixture of 0.5% MTBE and petrol in tank and again repeat 4 and 5 for different load.

      8. Before stop the engine remove the load and run the engine on no-load for two minutes.

      9. Stop the engine.

        1. GRAPHS:

          Chart -1: B.P.vs I.P.

        2. CONCLUSIONS

          • The general conclusion drawn for the results of this work for petrol engine are as follows as adding 0.05% MTBE in petrol efficiency increases 3.1%.

          • Adding MTBE in petrol helps in increasing octane number of fuel and better combustion.

          • The impact of modified fuel on combustion and performance parameters was clearly investigated in this study over the entire loading condition and observation are noted.

          • Increase in efficiency 3.1% was observed when fuel modified from pure petrol to 0.05% MTBE and 99.5% petrol.

          Chart -2: B.P. vs bth

          Chart -3: B.P. vs m

          Chart -4:B.P. vs T.F.C.

        3. REFERENCES

  1. Unit 7 engine testing IGNOU

  2. Characterization on gasoline engine using MTBE and DIE additives Volume 04 / March 2017(IRJET).

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