Difference between low emissions and standard emissions
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Thread: Difference between low emissions and standard emissions

  1. #1
    FRESHMAN ROVER
    Join Date
    September 10th, 2018
    Location
    Boston, MA USA
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    Difference between low emissions and standard emissions

    When I search for a Rover v8 on car part I see the following 3 options for both 4.0 engines:
    low emissions, (VIN 5, 7th digit)
    standard emissions, (VIN 2, 7th digit), secondary air injection
    standard emissions, (VIN 2, 7th digit), w/o secondary air injection


    For 4.6 engines there are:
    low emissions, (VIN 6, 7th digit)
    standard emissions, (VIN 4, 7th digit), Canada market, secondary air injection
    standard emissions, (VIN 4, 7th digit), Canada market, w/o secondary air injection
    standard emissions, (VIN 4, 7th digit), US market, secondary air injection
    standard emissions, (VIN 4, 7th digit), US market, w/o secondary air injection

    I get the difference between engines with and without Secondary air injection. What are the mechanical differences between the low emissions and standard emissions engines, if there are any? May be compression ratio? Or is the difference in different exhaust and ECU calibration?

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  3. #2
    JUNIOR ROVER
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    Re: Difference between low emissions and standard emissions

    Not sure wherre you got your info from but the 7th digit of the VIN tells you it is a P38 (or others). The 8th digit gives more detail on the engine emissions, whether it is high or low compression, with or without cats. See http://www.expeditiongear.co.za/cu5/...IN-Number.aspx. There are also a number of different firmware versions in the GEMS (and I assume Thor too) engine ECU to deal with the different hardware. Only NAS models had SAI.
    96 4.6HSE
    98 4.0 Police spec
    and a number of others I maintain for the owners.

  4. #3
    FRESHMAN ROVER
    Join Date
    November 10th, 2016
    Location
    Tasmania
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    245

    Re: Difference between low emissions and standard emissions

    Quote Originally Posted by Richard_G View Post
    Not sure wherre you got your info from but the 7th digit of the VIN tells you it is a P38 (or others). The 8th digit gives more detail on the engine emissions, whether it is high or low compression, with or without cats. See http://www.expeditiongear.co.za/cu5/...IN-Number.aspx. There are also a number of different firmware versions in the GEMS (and I assume Thor too) engine ECU to deal with the different hardware. Only NAS models had SAI.
    Checked mine with your VIN check thingy, engine and gearbox both wrong.. for my P38, with the Disco only the gearbox is wrong..

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  6. #4
    FRESHMAN ROVER
    Join Date
    September 10th, 2018
    Location
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    Re: Difference between low emissions and standard emissions

    Thanks for the replies, I appreciate it. Looks like the only options that can be read from the VIN are:
    - High Compression vs Low Compression
    - Cats vs no Cats (NAS P38 should always have Cats, I presume)

    The NAS trucks are different from ROW some have Secondary air some don't. All NAS trucks have after-cat O2 sensors. I am wondering if there are other engine variations within NAS? I am looking at swapping a P38 4.6 Bosch engine into an 03 Disco II which came with 4.6 from the factory. The last engines that went into Discos were quite problematic, looking to swap in an engine from a P38.

    What are the differences? Oil pan may be? Or should I expect a direct bolt-on?

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