DS23 Oil Cooler
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Thread: DS23 Oil Cooler

  1. #1
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    Default DS23 Oil Cooler

    Has anyone ever used an oil cooler on any of the DS engine or LHM fluids?

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    Just wondering if there was any value in it.


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    My DS21 has an engine oil cooler, original fitting.
    Woody

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    So has my DS23 ie.

    Yours probably does as well, facing the car look to the right front of engine. It is not large.
    ds23ie-moteur99.jpg
    Last edited by harrisson_citroen; 5th March 2019 at 02:49 PM.
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    Quote Originally Posted by harrisson_citroen View Post
    So has my DS23 ie.

    Yours probably does as well, facing the car look to the right front of engine. It is not large.
    ds23ie-moteur99.jpg
    I suspect only fuel injection cars have the low down beside the sump behind the left front disc oil cooler.
    IF it has one, chances are he has never seen it as it will be covered in black brake disc dust glued in place with decades of dried grease. The little shroud might prevent it looking like a heat exchange device.
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    I’ll check when I get home - I own a manual / carb DS23


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    Quote Originally Posted by Secretsenor View Post
    I’ll check when I get home - I own a manual / carb DS23


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    I agree with fritzelhund only injection cars, 69 - 75
    Link >>> oil cooler for citroen ds and id

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    I don't think you will find a cooler on the side of a BVM 23ie block.

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    My DS 23 ie didn't have one.
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    Quote Originally Posted by David S View Post
    I don't think you will find a cooler on the side of a BVM 23ie block.
    My DS23ie BVM had one . . .

    . . .but it started life as an auto

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    That's why. BVA and probably BVH 23ie only. The 23 BVM block won't have been machined to take the filter. Also, the ie block won't have a hole for the fuel pump as a carby will.

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    Ok. So it’s simply an in-line oil cooler on the return to the oil pump?


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    Has anyone considered or undertaken an LHM cooler? Would the extra viscosity of cooler LHM stress sells?


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    The oil cooler was introduced with the fuel injected dx3 engine in 1969 to help cope with the extra heat output. It was fitted to all cars except the 5sp manuals as these weren’t expected to experience sustained high rpms like the 4sp boxes. You’ll also find them on dx5 engines.

    The dx3 & dx5 engines have a different crank case and oil pump to feed the oil cooler. I think there’s also a change to the oil circulation path inside the block but done have a manual on hand to check.

    I believe the guy in the Netherlands who built the rally ds fitted an lhm cooler. LHM was engineered to have a very stable viscosity across a wide temperature range. Under normal conditions it should never boil or drastically change in viscosity.

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    Quote Originally Posted by Secretsenor View Post
    Has anyone considered or undertaken an LHM cooler? Would the extra viscosity of cooler LHM stress sells?


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    Probably a bit unnecessary as the hardest working LHM bits are dead ends at the spheres, so no flow. Some rally prepared CX and DS had a somewhat finned extra collar between cylinder and sphere that offered a bit more fluid volume as well as some small air cooling fins...and in the case of a DS allowed a bit more air gap separation from the exhaust manifold. ( and if I remember correctly allowed the sphere to be angled away from the manifold as well).

    Historically, heated hydraulic fluid was more of a problem on LHS cars. I remember one local DS 19 ( a REAL DS ) was fitted with a small air/oil cooler below the spare wheel in the radiator shute airflow. Whether it was of any real benefit I cannot say. In the early 60s the factory fitted vents and grilles on the tops of the front mudguards in an attempt to reduce underbonnet temperature..... called "ashtrays" .... cendrier ???

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    Default DS23 Oil Cooler

    Thanks for the replies!
    All a bit theoretical at this stage but am definitely considering some oil pressure, and water temp gauges in the void above the lighter on my 74+ DS


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