Mechanical Injection?
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  1. #1
    Sans Pond. STALLED's Avatar
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    Default Mechanical Injection?

    Hey,

    Could someone explain to me how "mechanical fuel injecton" works?

    Ive noticed that it is on the 505 SLI but the GTI and STI have a different system of injection, why is this so?

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    Cyas Stalled
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  2. #2
    Gone Fishin' Ray Bell's Avatar
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    Mechanical injection has the amount of fuel injected determined by mechanical means... vacuum, throttle opening etc combining to somehow affect the stroke of the piston that pumps the fuel into the cylinder each time.

    The STi and other Bosch K-Jetronic injections systems aren't as totally mechanical as that. I don't know exactly what differs, but they're not like the L-Jetronic which has all electronic controls.

  3. #3
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    K-Jetronic has a air flow meter that works directly on a piston/valve type arrangement in a fuel distributor through a lever - this opens a complex valve further as the vane opens more - the injectors are simple spring loaded valves that act on opening pressure, whereas L-Jet has the now-common solenoid operated active valve arrangement. There are loads of differences and evolutions - K-Jet also injects continously whereas L-Jet is pulsed. However, the Bosch systems (and most others, as they were essentially copies) continuously evolved through more and more electronic control add-ons, so the 'mechanical' part is a bit of a misnomer.Stu


    2003 PEUGEOT 206 GTi

  4. #4
    Sans Pond. STALLED's Avatar
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    Hey,

    Are there many problems associated with using a mechanical injection system compared to a computer based system- there just seems to be so many more moving parts in the mechanical system!

    Cyas Stalled
    2005 Renault Clio 182 Cup

    2011 Renault Megane 250 Cup Trophee - Sold

    1997 Peugeot 406 2.0 Manual - On Loan

    2004 Citroen C3 1.4 80th Anniversary (RIP)

  5. #5
    Fellow Frogger!
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    Icon7

    We are now well over the 400,000 km mark with our 505 fitted with the ZDJK (mechanical) Bosch fuel injection system.

    The system is completely reliable, requiring only occasional cleaning of the throttle body, replacing worn or cracked vacuum hoses etc.

    Equally reliable is the Bosch ZDJL as fitted to our 505 GTI S2.

    Cheers,
    Kim.

  6. #6
    1000+ Posts bowie's Avatar
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    concure with relaiability claim.. STI of mine has hit half a million barrier..

    dont know weather strength of original pug, or good mechanic. but either way.. still working

    Works: 2003 YV Commodore (That is Cecil to you)
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  7. #7
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    I had a BMW with 392,000km on it when sold and with K-Jetronic (mechanical injection, stalled) and it was entirely reliable. Never touched it. On the systems without an injection pump, there aren't really more moving parts, except when compared to later hot air (mass) sensor equipped electronic injection. There is, however, an issue with the plunger wearing in the fuel distributor after many miles.

    Stuey


    2003 PEUGEOT 206 GTi

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