Mazda skyactiv engine reliability




Mazda skyactiv engine reliability

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  • Mazda SkyActiv-G Engine specs, problems, reliability, oil, Mazda6, Mazda CX-5
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  • The SkyActiv-G (the PY-VPR and PY-VPS) is liter gasoline engine which was firstly introduced in the Mazda KE CX-5 and the GJ Mazda6 in

    The SkyActiv-G (Mazda's PE-VPS) is litre four cylinders gasoline engine, and it was first introduced in The engine includes non-standard technical.

    Have high mileage owners (say over miles) of the latest Mazda 3 had any reliability problems with the new Skyactiv engines.

    Mazda skyactiv engine reliability

    Mazda skyactiv engine reliability

    The long distance between the engine and the catalytic converter makes exhaust gases cooler and not hot enough to heat fast the catalytic converter in first minutes of operation. But then the sound disappears when the engine is warmed up. Strangely enough, there are no serious problems. Sigs are visible only in your first post on a page.

    Mazda skyactiv engine reliability

    Mazda skyactiv engine reliability

    Mazda skyactiv engine reliability

    Mazda skyactiv engine reliability

    Mazda skyactiv engine reliability

    SkyActiv Reliability? - to Mazda 3 Forum and Mazdaspeed 3 Forums

    The engine includes non-standard technical solutions, which is traditional for Mazda's engineering. The compression ratio of the new engine was increased up to unusual specs for gasoline engines - Increasing the compression ratio increases the temperature and pressure in the cylinder at the end of the compression stroke and gives high efficiency and power, but also a strong propensity for detonation - explosive combustion of the air-fuel mixture, which leads to overheating and destruction of the piston rings and pistons.

    To protect the engine from an explosion, the engine has ion sensors built into the ignition coils. Ionic sensors are more sensitive and allow better control of the moment of appearance of detonation in each cylinder. There is a thinner crankshaft which is grams lighter now. The engine has the shape optimized and lighter grams per cylinder pistons and connecting rods. On top of the head are the double overhead camshafts are driven by a timing chain.

    Mazda skyactiv engine reliability

    The chain is automatically tensioned using the chain tensioner actuated by oil pressure and the spring. The engine has four valves per cylinder, which are actuated by rocker arms with needle roller followers for friction reduction, instead of bucket tappets on the predecessor.

    The fuel is injected directly into the combustion chamber of the 2. That means that SkyActiv-G engine has a direct injection system and high-presser fuel pump. The fuel pump is driven directly by exhaust camshaft. The updated fuel system with direct injection provides pressure up to Psi bar because of high compression ratio and more top presser in the combustion chamber.

    Mazda skyactiv engine reliability

    The standard gasoline engines have a conventional fuel pump pressure of Psi bar. This configuration reduces the resistance when exhaust gases leave the cylinders. The exhaust gases pass a longer distance and create a rarefaction wave that facilitates the exhaust from the next cylinder.

    In addition to increasing the power, this reduces the temperature in the combustion chamber and the probability of detonation. To reduce pumping losses in the engine and increase efficiency, engineers taught him to work on two cycles: Atkinson and the more traditional Otto cycle for gasoline engines. The first is used at low loads when there is no need for high torque. The intake valves are closed later, already at the compression stroke, and some amount of gases exits through them back to the intake manifold.

    That reduces the actual compression ratio and pumping losses. This cycle makes the engine more efficiently. And with medium and high loads, the intake valves close earlier the usual Otto cycle and the cylinders are filled.

    Mazda skyactiv engine reliability

    The compression ratio again reaches 14 - and the engine produces high torque. The Atkinson cycle forced engineers to include in the intake system a vacuum pump for the normal operation of the brake booster.

    The vacuum pump is integrated with the high-pressure fuel pump. There are more small touches like new plastic impeller for the water pump, or smaller oil pump, etc.

    Why We Dumped the Mazda3



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