Spinning A CX engine backwards?
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  1. #1
    Fellow Frogger!
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    Default Spinning A CX engine backwards?

    Has anyone converted a CX engine to run backwards like a D engine? If not is there anyone who could advise on what would be required.

    As far as I can see the direction of the starter motor would need to be changed. Would a whole new cam need to be built or is there another way around that?

    Chris.

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  2. #2
    Real cars have hydraulics DoubleChevron's Avatar
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    Hmm,

    lets see:

    timing chain tensioner
    oil pump direction
    oil pump pickup (angle)
    camshaft (I guess)
    starter

    I think there's a couple of other things, they really are basically the same engine though.

    seeya,
    Shane L.
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  3. #3
    Fellow Frogger! ARCHRIVAL's Avatar
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    CX DIESILE motor on DS gearbox . no point unless they got it to go backwards maybe 5 reverse gears
    Attached Thumbnails Attached Thumbnails Spinning A CX engine backwards?-cx-desiel-ds-box.jpg   Spinning A CX engine backwards?-cx-desiel-ds-box2.jpg   Spinning A CX engine backwards?-cx-desiel-ds-box-2.jpg   Spinning A CX engine backwards?-cx-desiel-ds-box.4.jpg  
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  4. #4
    Real cars have hydraulics DoubleChevron's Avatar
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    About the only thing you can tell by the photo is they have used the DS sump

    seeya,
    Shane L
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    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

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  5. #5
    1000+ Posts Ken W's Avatar
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    Would it be possible to set up the diff the other way round in the gearbox? I think this is how they fitted the R16TS engine and gearbox to the Lotus Europa the other way around.

    Ken W

  6. #6
    Fellow Frogger! Paul Smith's Avatar
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    Quote Originally Posted by Ken W
    Would it be possible to set up the diff the other way round in the gearbox? I think this is how they fitted the R16TS engine and gearbox to the Lotus Europa the other way around.

    Ken W
    AFAIK it's not possible to do this with a D gearbox - the story goes that Lotus were tooling up all sorts of special bits for the Esprit until they realised that as the D engine went the 'wrong' way they were fine using the gearbox the wrong way round at the back of the car .

    Paul
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    Quote Originally Posted by Paul Smith
    AFAIK it's not possible to do this with a D gearbox - the story goes that Lotus were tooling up all sorts of special bits for the Esprit until they realised that as the D engine went the 'wrong' way they were fine using the gearbox the wrong way round at the back of the car .

    Paul
    I have also read that somewhere Paul, however I thought the earlier Esprits used the gearbox from an SM?
    Cheers,

  8. #8
    Fellow Frogger!
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    Have only seen one 'dif flop' in order to change the direction of drive in one of these boxes and it was a disaster (big yuck).

    Chris.
    1964 Type 3 Squareback. 1974 L Bug.

  9. #9
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    Quote Originally Posted by Brett R
    I have also read that somewhere Paul, however I thought the earlier Esprits used the gearbox from an SM?
    Cheers,
    The SM box was also used in the 205 T16.
    Graham

  10. #10
    Fellow Frogger! Paul Smith's Avatar
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    Quote Originally Posted by Brett R
    I have also read that somewhere Paul, however I thought the earlier Esprits used the gearbox from an SM?
    Cheers,
    Hi Brett,

    The 5 speed SM box is the same as the later 5 speed DS box - only the bell housing and a few other minor bits are different. (There's one at Penrith awaing installation in a Turbo Esprit now)

    Paul
    Paul Smith

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  11. #11
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    Quote Originally Posted by Paul Smith
    Hi Brett,

    The 5 speed SM box is the same as the later 5 speed DS box - only the bell housing and a few other minor bits are different. (There's one at Penrith awaing installation in a Turbo Esprit now)

    Paul
    Thanks for the clarification Paul!

  12. #12
    Tadpole
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    If you were to run the camshaft in the opposite direction to crankshaft by replacing the timing chain drive with a gear train with two idler gears the only other things to alter would be to starter motor and the oil pickup.
    Expensive but possible with a modified timing cover that held the two idler gears.

    Robert

  13. #13
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    On the Renault R4 motor that runs in the opposite direction to the basically identical Dauphine motor, the crank oil ways are drilled to suit the spin of the motor in the opposite direction, also the pistons (offset gudgeon) and rods are rotated 180 degrees, clutch and cam are different too. So a modified crank may also be needed with a CX conversion.

  14. #14
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    Quote Originally Posted by 2mnecxs
    If you were to run the camshaft in the opposite direction to crankshaft by replacing the timing chain drive with a gear train with two idler gears the only other things to alter would be to starter motor and the oil pickup.
    Expensive but possible with a modified timing cover that held the two idler gears.

    Robert
    Robert,

    Nice idea, I like those sort of solutions - especially if a pair of gears where found that just happened to be right for the job (the timing chest of a triumph twin is much like that, has some sort of composite fibre gear as the idler gear and they spin on pins that are located in the block).

    Have been takeing a close look at the Honda H22A 2.2L four (200 bhp, DOHC, VTEC) which is also a counter clockwise spinner. It is certainly a very fine engine and much more in keeping with the quality of suspension/brakes etc of a D (don't much care for cast iron pushrod engines).

    Chris.
    1964 Type 3 Squareback. 1974 L Bug.

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