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Thread: 2017 3A92 engine with roller cam.

  1. #81
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    Quote Originally Posted by Ghee View Post
    Can you confirm that the manual doesn't have the roller cam? I can't believe that would be true.
    I agree, seems unlikely. I'm sure they use the same cam.



  2. #82
    Administrator Daox's Avatar
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    The 2017 CVT and manual share the same intake camshaft, but they do have different exhaust camshafts. The manual exhaust cam is the same as the 2014 / 2015 exhaust camshaft.

    Here is a parts list. The columns are 2014 / 2015 / 2017. From: 3A92 engine parts history (changes over the years)

        __________________________________________

        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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    Doax (or anyone else who knows) in the other thread, about the Cam swap..

    What would make 1 exhaust cam better for economy then another and why?

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    I'm by far not a cam expert. But, here is what I know. The cams largely effect where the powerband of the engine is. Typically, by lowering the power band (shifting peak torque output to a lower rpm), you generally improve your fuel economy. It makes your engine breather more efficiently in the rpm band you normally cruise. However, this also typically lowers the peak horsepower output of the engine.

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        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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    Fair enough, neither am i.

    I wouldve have thought for the exhaust you would just want the biggest lift with longest duration reasonable.

    Soooo... Googled a bit and came up with the common differences between a cam designed for auto and manual is the lobe separation. Seeing as there's 2 seperate cams, ide suspect it would be pretty hard to measure.

    Hopefully one day well have some solid facts on lift and duration.

    https://www.google.com/amp/s/www.hem...0.html%3famp=1

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    Quote Originally Posted by Pryme View Post
    I agree, seems unlikely. I'm sure they use the same cam.
    There would be a variation in manufacturing. It wouldn't be cost effective to do so is what I believe.

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    So yes to the roller cams



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