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Thread: 3A90 1.0L 3-cylinder Mirage / Space Star engine info (specs, specifications)

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    Administrator Daox's Avatar
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    3A90 1.0L 3-cylinder Mirage / Space Star engine info (specs, specifications)

    Lets start with the 3A90's specs:

    (For info on the 3A92 (1.2L) engine see here: 3A92 Engine Information)

    Displacement: 1.0L (999 CC)
    Cylinders: 3
    Valves: 12
    Maximum Output: 52 kW (71 PS / 70 HP) @ 6000 rpm
    Maximum Torque: 88 Nm (64 lb·ft) @ 5000 rpm
    Bore: 75 mm
    Stroke: 75.4 mm
    Compression Ratio: 11.5:1
    Fuel Delivery: multi point fuel injection
    Fuel type: Unleaded regular gasoline, gasohol E10, E20
    Valve Technology: DOHC, MIVEC (Mitsubishi Innovative Valve timing Electronic Control) - see video: New MIVEC continuously variable valve control mechanism
    Fuel Economy: see Fuel economy ratings by country

    Torque curve:



    Horsepower and Torque comparison: (red 3A92, orange 3A90)

    Name:  3a92vs3a90.jpg
Views: 8444
Size:  54.1 KB

    Additional features:

    - Exhaust manifold with integrated catalytic converter (reduces weight, lowers emissions)
    - Additional weight reduction through: aluminum cylinder block; crankshaft chain case integrated with engine mount
    - EGR module for increased fuel economy, reduced emissions
    - Friction reducing measures: lower rigidity piston skirt; plastic piston coating; lower valve spring loads; smoother camshaft journal; lower oil pump output

    Source: http://www.mitsubishi-motors.com/en/...S_EnP_3A90.pdf

    Images:






    Source: http://www.jsae.or.jp/e07pub/yearboo...ne_engines.pdf


    Attached Images Attached Images     
    Last edited by Daox; 02-15-2013 at 04:00 PM.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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    zefke (12-12-2013)

  3. #2
    Administrator Daox's Avatar
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    This explains why the 1.0L hasn't made it to many developing countries. The 1.0L touts 11.5:1 compression ratio! If you don't have high quality fuel you're going to have issues with that high of a compression ratio.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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    Senior Member jamiec's Avatar
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    This 1l engine is more efficient then the 1.2l wish we could have the 1l as an option here in OZ.

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    Administrator Daox's Avatar
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    We could use more images of engines and/or engine bays. If any of you guys can snap a picture it would be appreciated.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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    Administrator MetroMPG's Avatar
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    Added to first post: torque curve & additional info & images about this engine, from http://www.mitsubishi-motors.com/en/...S_EnP_3A90.pdf

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)


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    Daox (10-08-2013)

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    Administrator Daox's Avatar
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    Interesting and good info Darin.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 49.0 mpg (US) ... 20.8 km/L ... 4.8 L/100 km ... 58.8 mpg (Imp)


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    Senior Member Clessy's Avatar
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    If the 1.0 litre would of been a option in the states i'd of easily gotten it. The 5 to 7 more hp of the 1.2 litre really isnt important in a car like this. Granted its already hard enough finding parts for the 1.2 so i'd hate to have a car with a even less common engine option.

    Heres hoping for a 1.0 turbo in the future so I can trade up.

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    Senior Member Mikhail's Avatar
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    Probably we are going to have the 1.1 Turbo next year. If the MPG will be a like or better to Fiesta's Ecoboost and price is right, then it's going to be a brilliant car.

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    Administrator MetroMPG's Avatar
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    Quote Originally Posted by Clessy View Post
    If the 1.0 litre would of been a option in the states i'd of easily gotten it.
    Me too.

    FYI, started a poll on the topic: Poll: 1.0L Mirage engine = 7.5% better fuel economy. Would you choose it?

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)


  12. #10
    Senior Member ahausheer's Avatar
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    Bumping an old thread with a new question....so the 1.0 uses an EGR port while the 1.2 has no EGR? If true I wonder if the 11.5/1 compression on the 1.0 needs EGR to stay cool?



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