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Thread: 3A92 1.2L 3-cylinder Mirage / Space Star engine info (specs, specifications)

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    Administrator Daox's Avatar
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    3A92 1.2L 3-cylinder Mirage / Space Star engine info (specs, specifications)

    Lets start with the 3A92's specs:

    Displacement: 1.2L (1193 CC)
    Cylinders: 3
    Valves: 12
    Maximum Output: 55 kW (74 HP / 75 PS) @ 6000 rpm
    Maximum Torque: 100 Nm (74 lb·ft) @ 4000 rpm
    Bore: 75mm
    Stroke: 90mm
    Compression Ratio: 10.5:1
    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

    For info on the 3A90 (1.0 L) engine see here: 3A90 Engine Information

    Images:

    Attachment 2228



    Above image: Alex16



    3A92 (red) and 3A90 (orange) comparison.



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    Above Dyno image from EcoModder.com - Note this is a Philippine spec Mirage and it may not share the same factory tune as all other countries.

    Image thanks to Nimmic.




    Image thanks to ShiroMirage:


    Image thanks to ShiroMirage:


    Image thanks to ShiroMirage:


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    Last edited by Daox; 02-15-2013 at 03:02 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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    A Metro owners dream !

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    arollinstone - you're right on the money there.

    I think this car is essentially a modern-day Metro: similar size, weight & fuel economy to the last generation Metro, but with a more advanced engine (eg. MIVEC variable valve control) giving more power, safety & options.

        __________________________________________

        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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    Administrator Daox's Avatar
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    It seems to have most of the bells and whistles. The start/stop would certainly be great to have here. Sadly, I doubt they'll bring it here due to the EPA (US fuel economy) test not accounting for cars being stopped sitting at a light or stop sign. Start/stop systems show zero benefit on this test cycle despite real world benefits of around 10% in city driving.

    Another thing I noted was that it doens't have is direct injection. Most of the new engines have this, but both of the Mirage engines have multipoint fuel injection. I was reading in some Australian (I think) article where they claimed that they dropped the idea of direct injection due to the cost of adding it. There was also the issue with fuel quality in developing countries that makes direct injection a bit more finicky.
    Last edited by Daox; 01-21-2013 at 05:59 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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    Quote Originally Posted by MetroMPG View Post
    arollinstone - you're right on the money there.

    I think this car is essentially a modern-day Metro: similar size, weight & fuel economy to the last generation Metro, but with more power, safety & options.
    MetroMPG, You were the one that turned me into a Metro fanatic since way back when. I've got extra parts up the ying and yang.

    I can routinely attain 70 + mpgs in any metro I touch. Another 10, maybe even 5 years I'll have one of these to mess with.

    Could you imagine the mpgs we'd get with the Valve timing Electronic Control, multipoint fuel injection or direct injection. I hope

    they come up with more transmission gear ratios and such so we can mess with that too.

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    I don't mind the lack of Auto Start/Stop. I can do that myself.

    ---

    arollinstone - so far I've only seen one set of gear ratios published (here). I'm seriously hoping they don't "dumb down" the ratios for Canada/US to cater to drivers here who aren't willing/capable of downshifting from top gear when more power is needed. I want my tall top gear!

        __________________________________________

        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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    Senior Member Alpha_One's Avatar
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    The 5th gear ratio can still be taller, actually. 4th and 5th are close enough together that I treat the gearbox as a 4-speed (1-2-3-5) in light to moderate traffic. Top gear cruising at 100kph (62mph) results in the engine spinning at 3k RPM. From what I hear from other owners, CVT Mirages cruise at that same speed with the engine at 2k RPM.

        __________________________________________

        click to view fuel log View my fuel log 2012 Mirage GLS 1.2 manual: 33.3 mpg (US) ... 14.1 km/L ... 7.1 L/100 km ... 40.0 mpg (Imp)


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    Administrator Daox's Avatar
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    That is the thing that really confuses me. All the fuel economy ratings I've seen for highway driving show the CVT as getting worse mileage than the manual despite the much lower rpms...

        __________________________________________

        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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    Interesting thats a big change in rpm at 100klm between the cvt and manual. Cvt trans are not always as efficient as a manual box. They tend to have a lot more friction on the variable drive belts in them. And Alpha One mentioned the cvt has a bigger radiator fitted then the manual most likly to deal with the extra heat from the cvt.

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    Quote Originally Posted by MetroMPG View Post
    I don't mind the lack of Auto Start/Stop. I can do that myself.

    ---

    arollinstone - so far I've only seen one set of gear ratios published (here). I'm seriously hoping they don't "dumb down" the ratios for Canada/US to cater to drivers here who aren't willing/capable of downshifting from top gear when more power is needed. I want my tall top gear!
    I feel ya MetroMPG, I followed in your foot steps and got spoiled by the 3.52s. 2400 rpms at 60 mph but I don't go that fast.



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