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Thread: DTi Engine history

  1. #1
    Regular Member greeningr's Avatar
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    Default DTi Engine history

    Just a questions that's been going around my head for a while now.

    I've noticed that the current range of deisel engines are 1.9CDTi or 3.0 V6 CDTi

    But in the past there was 2.0 DTI and 2.2 DTI

    Does anyone know why VX has gone back to the 1.9 unit, when other manufacturers are going from 1.9 to 2.0?

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    Regular Member CBR600FV's Avatar
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    1.9 Unit is a current Fiat engine that meets the Euro4 emissions. Old style Vxl engines would have had to have a make-over to meet Euro4. Cheaper to go down the colaberation route. Look at Ford using PSA engines in Fiesta, Focus, Jag, Land Rover etc

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    Regular Member OilBurner's Avatar
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    If you've experienced both then you'll understand my Vx went down the route of borrowing the Fiat engines. I had the Astra with the 2.0 DTI, whilst it was quick in gear, off the mark it was slow. It was pretty noisy once it'd run past 10K miles too, and the vibrations weren't great.

    I also test drove a Vectra Estate with the same 2.0 DTI unit, the extra sound deadening helped, but it still wasn't up to modern standards, and that's before you start considering Euro IV problems!

    IMO, the 1.9 16v CDTI is a far better engine than the old DTI ever was. The relative lack of noise and vibration at idle is remarkable. Better than the Volvo S60 D5 I drove recently, that's for sure.
    On the move, it's so refined it's perfect for cruising.

    IIRC, the DTI had slightly less turbo lag, but the new twin-turbo 1.9 should sort that out! Come on Vx, bring it on!

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    CDTi is high pressure common rail (HPCR) injection, whilst the older DTi is a distributor pump type. Common rail allow far better control of injection events during combustion cycle, even allowing more than one fuel injection per stroke. eg Pilot injection (early in cycle), main injection and then a little post injection (late in combustion cycle) Some injectors allow 5 events per stroke. This would never be achievable with mechanical distributor pumps.

    The emissions, power density, fuel economy, noise, etc can be better controlled with HPCR. The ECM controls when, how much and how the fuel is injected - depending on engine operating conditions. This is why 'super chips' work really easily with these models, and can have huge increases of power / torque. And it is not a step backwards

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    Regular Member OilBurner's Avatar
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    Definitely not a step backwards, my old DTI used to smoke like a chimney stack under hard acceleration - not this CDTI baby! Vrrooom!

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    Regular Member greeningr's Avatar
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    Thanks for the info

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