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  1. Join Date
    Jan 2005
    Posts
    445
    #11
    EFI saves fuel , but carb is a simple, stable tech.
    EFI has less moving parts , but a lot of sensor.
    A lot of sensors means a lot of point of failure.

    A carb can last more than an efi can!
    At consider mo na bahain d2 sa atin, pag nabaha ang ecu, todas.

  2. Join Date
    Jan 2009
    Posts
    5,577
    #12
    Quote Originally Posted by reym View Post
    EFI saves fuel , but carb is a simple, stable tech.
    EFI has less moving parts , but a lot of sensor.
    A lot of sensors means a lot of point of failure.

    A carb can last more than an efi can!
    At consider mo na bahain d2 sa atin, pag nabaha ang ecu, todas.
    But also consider that all those sensors are there to: 1. Protect the environment and 2. Protect the engine. Old carb'ed engines have no way to detect engine knocking, nor did it have flexibility to do real-time engine timing and A/F ratio adjustments.

    As with most parts of the engine, sensors are also consumable items (especially O2 sensors) and are subject to fail eventually, like a light bulb. But it's NOT to say that they're unreliable.

  3. Join Date
    Jan 2005
    Posts
    445
    #13
    Those sensors are to protect the engine from the computers' advance timings.
    A stock carrbed car won't advance to its limit if you tune it properly.

    If you try to put a regular gasoline in an efi engine, the sensors will not be able to protect the engine from knocking.

    EFI is designed by car manufacturers for maximum profitability, because carbs and distributors last for a very long time. Here is the olderst car that is still running : http://www.waleg.com/cars/archives/010383.html

    As for the vapor pressure problem for the carb, the carb has no problem with vapor pressure, the problem lies with the fuel pump, adding a return to tank line from the fuel pump would solve the problem.

  4. Join Date
    Jan 2009
    Posts
    5,577
    #14
    Most EFI engines have knock sensors that will retard the ignition when it detects knocking. Of course, the ECM can only do so much (ie. it can't infinitely retard the ignition) so you still need to use the prescribed fuel.

    I agree that there's also the commercial motivation behind switching to EFI. However, no one can discount the fact that this technology is used to make engines more efficient and environmentally-friendly. No free lunch. :D

    If I understand correctly, the vapor pressure line goes from the fuel tank EVAP can to the purge valve on or near the intake manifold and its purpose is to keep negative pressure in the tank to prevent gasoline vapors from venting into the atmosphere as pollutants.

  5. Join Date
    Jul 2009
    Posts
    3,604
    #15
    Quote Originally Posted by reym View Post
    At consider mo na bahain d2 sa atin, pag nabaha ang ecu, todas.
    Yung ECU nasa banda taas ng engine bay in most (well-designed) cars.

    By the time inabutan yung ECU mo ng tubig, lunod na rin makina mo.

    Pareho lang ang EFI and Carb engines - bumibigay din ang distributor and other parts just like fuel injectors.

    Masirain or not depends on HOW you maintain the engine and its components. Kung di mo alagaan, di yan tatagal - EFI o Carb.

    Here's an example of a well-maintained EFI engine:



    The odometer is in miles btw, translating to about 600,000 km traveled. Wala pang sira. That car probably did more km than our cars will see in their lifetime with us.

  6. Join Date
    Oct 2002
    Posts
    22,658
    #16
    EFI engines are almost idiot proof. Just set and forget. Unlike carb engines that require adjustments every now and then.

    EFI is more fuel efficient, more environment friendly.

    ECU's are located high up in the engine compartment or inside the passenger cabin to protect them from the elements. We have an EFI car from the 1980's. Less problematic than our carb equipped unit which is 10 years younger.

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EFI..sirain?