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Thread: Please explain??

  1. #1
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    Please explain??

    What this actually does and why do I need one??
    http://www.equipe4x4.com.au/shop/ind...d&productId=27
    The Ugly Duckling-
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  2. #2
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    I could probably knock up half a dozen of them in and hour or so.......and for considerable less than $139.00

  3. #3
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    While you're at it, perhaps someone can explain why they want $239 for a snatch block ....

    I always thought gold was too soft for this application ..

  4. #4
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    Quote Originally Posted by RobHay View Post
    I could probably knock up half a dozen of them in and hour or so.......and for considerable less than $139.00
    so could I, but it was easier to post the link then try and explain what something I dont understand was.I wouldnt want to look like a tool, would I?
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  5. #5
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    As it says, it blanks off the exhaust gas recirculation. The system is done for emissions. Blanking it off simply means that you get more clean air inducted into the engine and it is colder.

  6. #6
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    Quote Originally Posted by PeterM View Post
    As it says, it blanks off the exhaust gas recirculation. The system is done for emissions. Blanking it off simply means that you get more clean air inducted into the engine and it is colder.
    so its illegal, but it gives you a cleaner engine inside?
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  7. #7
    JDNSW's Avatar
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    Quote Originally Posted by crump View Post
    so its illegal, but it gives you a cleaner engine inside?
    Well, I'm pretty certain it would render the vehicle unroadworthy, and there may even be specific laws against it. I don't know that cleaner inside would be how I'd put it - the main effect is to increase the oxygen content of the air being taken in, and reduce it's temperature (which means more air and hence more oxygen, the overall effect being to increase the available power, but at the expense of a higher combustion temperature, resulting in increased nitrogen oxides in the exhaust, which would bring them over the design levels - although since it was designed for European limits, I'm not sure how it goes for the applicable Australian limits, which were quite a bit less stringent when the TD5 was approved for sale here. But regardless of this, altering the EGR system is almost certainly illegal - there is no regular testing regime, so the system relies on banning alterations. But since there is no testing regime, your chances of getting caught are virtually zero - unless you get pulled over for something else and they decide to see what else they can find wrong!

    John
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  8. #8
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    Quote Originally Posted by JDNSW View Post
    Well, I'm pretty certain it would render the vehicle unroadworthy, and there may even be specific laws against it. I don't know that cleaner inside would be how I'd put it - the main effect is to increase the oxygen content of the air being taken in, and reduce it's temperature (which means more air and hence more oxygen, the overall effect being to increase the available power, but at the expense of a higher combustion temperature, resulting in increased nitrogen oxides in the exhaust, which would bring them over the design levels - although since it was designed for European limits, I'm not sure how it goes for the applicable Australian limits, which were quite a bit less stringent when the TD5 was approved for sale here. But regardless of this, altering the EGR system is almost certainly illegal - there is no regular testing regime, so the system relies on banning alterations. But since there is no testing regime, your chances of getting caught are virtually zero - unless you get pulled over for something else and they decide to see what else they can find wrong!

    John
    soooo? Does it increase EGT's? And because its you John, and I know you really know your stuff, if it wasnt illegal would you fit one?
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  9. #9
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    It looks like something this bloke would use just before a night in the bedroom.

  10. #10
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    Quote Originally Posted by crump View Post
    soooo? 1) Does it increase EGT's?

    2) And because its you John, and I know you really know your stuff, if it wasnt illegal would you fit one?
    1) I don't know for sure, but I assume since the EGR is intended to reduce combustion temperatures to reduce the formation of nitrogen oxides, that it would increase EGTs. However, the relationship will not be simple - the EGR is intended to reduce the peak temperature, whereas the EGT is measured on the combustion products after they have been thoroughly mixed and expanded during the power stroke, and as the incoming charge is cooler, and has more mass, the higher peak burning temperature may be counteracted by this. Complicating the situation is that the increased amount of oxygen in the charge allows increased maximum fuelling, without increasing smoke, and this would certainly increase EGT. I think you would have to do before and after measurements to be certain of the result, but in any case the effect would be small.

    2) I don't have a TD5, so I can't really answer the question. But before doing this or any similar modification to my engine, I would want to thoroughly understand the implications.
    A comparable type of modification with the Series petrol engine is to remove the PCV setup, which is commonly done, mainly to avoid problems with the valve, and just to get rid of the pipes and hoses hanging off the engine, (often in conjunction with fitting a different carburetter). But a lot of people simply remove the setup, and end up with no effective crankcase ventilation at all on the engine, which, particularly in a cool damp climate or when used for short trips, is a recipe for accelerated engine wear from internal corrosion. To do the job properly you would have to go to the pre-PCV setup, with filtered vents on both the rocker cover and the filler tube with a shroud on one of them to ensure through flow. (my 2a retains the PCV!)

    John
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

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