all-manual diesel conversion for MZR

Discussion in 'Diesel Engines' started by halfrhovsquared, Jan 17, 2020.

  1. halfrhovsquared
    Joined: Jan 2020
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    Location: USA

    halfrhovsquared Junior Member

    You can take a 1.6L Peugeot/Citroen engine (DV 6) and replace the injection pump and injectors with a manual Bosch from a TDI. This lets the engine run without a battery or ECU once started with is great for simplicity and reliability. This conversion is good for up to about 110hp if you use an intercooled turbo.

    Does anyone know if the same thing can be done to the Mazda MZR 2.2L (or better yet lighter Skyactiv) engine to get ~180hp with a really lightweight result? Obviously it won't be as fuel efficient as the stock engine with all the electronics and tuning. Light weight is important.

    In other words- can the MZR function relatively efficiently on a manual injection only? Possibly with the use of their ceramic glow plugs because of the lower compression ratio?
     
  2. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    I think you mean mechanical injection, not manual injection.
     
  3. Rumars
    Joined: Mar 2013
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    Rumars Senior Member

    You mean replace the existing electronic common rail system with an all mechanical direct injection? What's the weight advantage between an older 1,6 Al block and a new one?

    The low compression diesels had start problems that could only be cured by piezo actuated injectors so I doubt it would function on mechanical DI.
     
  4. halfrhovsquared
    Joined: Jan 2020
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    halfrhovsquared Junior Member

    Good observation about wording- I meant mechanical not manual.

    Difference between 1.6 and 2.2 is purely power output and power density. The Skyactiv diesel has very impressive power to weight ratios for their engines.

    What about the MZR cold start improvement with its ceramic glow plugs plus variable exhaust valve lift (to open earlier while warming up)?

    In other words- what has the most impact on cold starting- piezo injectors, glow plugs, or VVL?
     
    Last edited: Jan 17, 2020

  5. Rumars
    Joined: Mar 2013
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    Rumars Senior Member

    The power output from a given capacity is a function of how much air and fuel you can put in for a given time. Mechanical injections can only do so much, that's why everybody switched to electronic control (plus emission standards of course).
    Power to weight ratios will be different for the same engine with different injection systems and settings.
    My question was: what is the weight difference between an older "native" mechanical DI aluminium engine and a new electronically controlled one? Once you take out the electronic CR, the available power will reduce to what the mechanical DI is capable of, so to make a difference in power to weight ratio the engine itself must be lighter.

    I doubt you can operate the mazda skyactiv without electronics. I am not sure but I think the variable valve timing is electronicly controlled.
     
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