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Thread: Dauphine Gordini on eBay

  1. #26
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by Kim Luck View Post
    Generally a bypass oil filter is just fed oil through a smaller orifice than the one that feeds the oil galleries. It is not really rocket science, just two different sized holes. I'm sure there is a scientific explanation for what happens but you don't need one for it to work....
    Thanks Kim. Yes, not rocket science. It is just that I have this brand new aftermarket one I bought years ago from USA and don't see small orifices, so when Alan Moore suggested his worked with the filter providing the restriction, it fired up my interest. If there were a type of filter with an inbuilt restrictor orifice, that's to be chased. I might need to build a test rig somehow..... Sounds like fun, come to think of it.

    Best wishes for the festive season too.

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    JohnW

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  2. #27
    1000+ Posts Kim Luck's Avatar
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    All the merry breast to you and yours John! And here is the solution to your dilemma! Consider it a Christmas present! ;-)
    Attached Thumbnails Attached Thumbnails Dauphine Gordini on eBay-bypass-filter.jpg  
    Don't it always seem to go that you don't know what you've got 'til it's gone............

  3. #28
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    Quote Originally Posted by JohnW View Post
    Hi David,

    Do you by any chance know exactly where the restriction to flow is and what it is?

    Cheers
    Hi John,

    On my filter there is a bush screwed into the spot that the original oil pressure switch was mounted. A tee piece, is screwed into the bush. The oil pressure switch is screwed into one arm of the tee and the off take to the filter comes from the other arm of the tee. This arm to the filter has a reduced orifice to maintain engine oil pressure. I am not sure of the diameter of this orifice.

    Regards

    David

  4. #29
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by DJ 750 View Post
    Hi John,

    On my filter there is a bush screwed into the spot that the original oil pressure switch was mounted. A tee piece, is screwed into the bush. The oil pressure switch is screwed into one arm of the tee and the off take to the filter comes from the other arm of the tee. This arm to the filter has a reduced orifice to maintain engine oil pressure. I am not sure of the diameter of this orifice.

    Regards

    David

    Thanks David. It all does look as if the "entry" orifice is the key. I'll have a good look at the one I have and ponder fitting it. I have a tee piece already for my oil pressure gauge - this could get complicated!

    Really appreciate the response.

    Cheers
    JohnW

    Renault 4CV 1951
    Renault R8 1965
    Renault Scenic 2005 (wife's)
    Renault Scenic 2007 (mine)
    Renault Scenic 2006 (daughter's)
    CitroŽn CX Pallas 1980

    National Co-ordinator, Renault 4CV Register of Australia

  5. #30
    1000+ Posts Kim Luck's Avatar
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    In the exploded view I posted you will see a bypass valve at the top. The oil flow (pressure) to the filter is controlled by preset spring tension. In this system a restricting supply orifice is not needed, but the result is the same. This is probably how Alan Moore's bypass filter works!
    Don't it always seem to go that you don't know what you've got 'til it's gone............

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