which pistons?
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Thread: which pistons?

  1. #1
    1000+ Posts Dave's Avatar
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    which pistons?

    Okay guys here is a brainteaser. I got my head off today. The car is a citroen BxGT. The block has the label "DFZ"(XU9J1 for you peugeot owners) which means it is a fuel injection engine with compression 8.4:1 and when i got the head off i measured the valves and looked around and i am quite sure it has the GT head and cam on it(the GT engine has 9.3:1 compression). I am assuming the change in compression is due to different pistons. Now the question - is there any way to tell which pistons i have. Thanks for any help guys. Here is a close up picture of a piston if that will help? You can see the marking "11" and "C2" this marking is on each piston. The pistons dish inwards (are concave), the picture isn't very clear.
    cheers,
    dave
    <img src="http://members.optushome.com.au/wilsonkrg/piston3.jpg" alt=" - " />
    sorry about the size of the pic guys

    <small>[ 18 June 2002, 08:19 AM: Message edited by: Dave ]</small>

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  2. #2
    Tadpole
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    Appartently on 205's (I assume BX's as well) the piston tolerance to the sleve is also less to allow for our 'hot conditions' with increased thermal expansion. Fitting UK spec piston/sleves is supposed to increase compression. This is one of the reasons S1 205's chew threw thin oil.

  3. #3
    Gone Fishin' Ray Bell's Avatar
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    Leon:
    Appartently on 205's (I assume BX's as well) the piston tolerance to the sleve is also less to allow for our 'hot conditions' with increased thermal expansion. Fitting UK spec piston/sleves is supposed to increase compression. This is one of the reasons S1 205's chew threw thin oil.
    Where does that story come from?

    Sounds silly to me... engine temperature is dictated by thermostat setting... unless the radiator is really bad. And pistons shouldn't dictate oil usage or compression, that's the job of the rings.

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