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Direct Injection petrol engines

  • 15-11-2016 8:40am
    #1
    Poulgorm
    Registered Users, Registered Users 2 Posts: 813 ✭✭✭


    Seems to be a lot of problems with direct injection petrol engines - has to do with carbon build up on the intake valves, apparently. Leading to costly repairs, early on in life (usually as soon as the guarantee has expired). Also, it seems that some warranties exclude it.

    A few questions:
    1. Have all turbo charged petrol engines got direct injection?
    2. Are there any direct injection petrol engines out there which do not have this problem? I heard something about dual port engines, which reduces this problem. Not sure what this is about.
    3. How do you find out if an engine has direct injection? The manufacturers' websites are no help. And don't suggest asking a salesman
    4. I intend to get a new car in 2017 - probably a Mazda CX3 or a Honda HRV. Both have 1.5 litre non turbo engines. I am told that the CX3 has direct injection, but the HRV doesn't have. Is this correct? If so, it may swing things in favour of the Honda.

    Over to the experts here...


Comments

  • #2
    Special Circumstances
    Closed Accounts Posts: 7,569 ✭✭✭Special Circumstances


    The coking up problem has been around since 1996 when Mitsubishi brought out their 1.8 GDI that Volvo later used in the S40.
    Noisy, problematic AND increases pollution - Petrol Particulate Filters, sounds like a great idea doesn't it?
    Walnut blasting every 60k, sure - why not?!?

    Type "prince engine c" into google and it auto completes to "prince engine carbon build up" - every body who has one of these engines has googled this.

    Fractionally lowers CO2 and fuel consumption so it will be forced on us one way or another via "green" carbon taxes.


  • #3
    Poulgorm
    Registered Users, Registered Users 2 Posts: 813 ✭✭✭Poulgorm


    Special Circumstances wrote: »
    The coking up problem has been around since 1996 when Mitsubishi brought out their 1.8 GDI that Volvo later used in the S40.
    Noisy, problematic AND increases pollution - Petrol Particulate Filters, sounds like a great idea doesn't it?
    Walnut blasting every 60k, sure - why not?!?

    Type "prince engine c" into google and it auto completes to "prince engine carbon build up" - every body who has one of these engines has googled this.

    Fractionally lowers CO2 and fuel consumption so it will be forced on us one way or another via "green" carbon taxes.

    That's when they are new. When the carbon quickly builds up on the intake valves, they are heavier on fuel and worse emissions. Sometimes, I feel we need a European Trump...


  • #4
    Special Circumstances
    Closed Accounts Posts: 7,569 ✭✭✭Special Circumstances


    Poulgorm wrote: »
    Sometimes, I feel we need a European Trump...

    fintan and una have just launched their Virtue Drones from Irish Time's HQ and are about to flatten your house. Or at least crack all your windows - the drones are equipped with a recording of Matt Cooper in full ultrasonic shrieking meltdown when he heard Clinton lost.


  • #5
    Ardennes1944
    Registered Users, Registered Users 2 Posts: 9,238 ✭✭✭Ardennes1944


    This is a big issue on the THP engines as mentioned (along with the timing chain issue). Had the problem on my old 207


  • #6
    Renegade Mechanic
    Registered Users, Registered Users 2 Posts: 7,934 ✭✭✭Renegade Mechanic


    Something I just never understood, having direct injection on a petrol car and not having at least a tiny little injector remaining in the intake system, to wash carbon periodically. At least with diesels, the airflow is so strong, carbon buildup doesn't get a chance to have the same adverse effect, but in petrol, this honestly should have been addressed which given the millions involved in development I'm amazed it hasn't.


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  • #7
    joujoujou
    Registered Users, Registered Users 2 Posts: 13,983 ✭✭✭✭joujoujou
    Unregistered Users


    Poulgorm wrote: »
    [...]

    A few questions:
    1. Have all turbo charged petrol engines got direct injection?

    Of course not.
    Poulgorm wrote: »
    2. Are there any direct injection petrol engines out there which do not have this problem? I heard something about dual port engines, which reduces this problem. Not sure what this is about.
    Cannot answer 100% that. A good friend of mine has a 2001 avensis with 1AZ-FSE engine (direct injection alright) and never had any problems.
    Poulgorm wrote: »
    3. How do you find out if an engine has direct injection? The manufacturers' websites are no help. And don't suggest asking a salesman
    [...]

    Engine code lookup on wikipedia may help (see the above link).
    Renegade Mechanic wrote: »
    Something I just never understood, having direct injection on a petrol car and not having at least a tiny little injector remaining in the intake system, to wash carbon periodically. [...]

    [...] more advanced direct injection system, which combines both direct and indirect injection using two fuel injectors per cylinder, a traditional port fuel injector (low pressure) and a direct fuel injector (high-pressure) in a system known as D4-S. [...]


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