mi16 extra compression
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  1. #1
    1000+ Posts cav91's Avatar
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    Default mi16 extra compression

    Just wondering are there any, I guess 'easy' ways to get extra compression. I'm going to look a series one mi16 this weekend, with a brocken timing belt. So the head would come off (If I buy it) just wondering if while it's off there's any affordable things to do whilst in there.
    Are there any other model pugs/cits we got here that have higher comp pistons etc. Like Bx TZi? That sort of stuff.

    When I was playing with fuego's I found out that you could use a late 25/21 engine, early 25 pistons and an early fuego cam, to make a really nice engine. Can you do any mixing and matching with the mi16?


    Cheers Chris

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  2. #2
    1000+ Posts PeterT's Avatar
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    Check out my website for ideas. Additionally, Cometic now make a 0.7mm gasket. I also have a contact who can make any thickness gasket. Around US$120.

    '92 205 Mi16
    '90 Mi16x4

  3. #3
    1000+ Posts cav91's Avatar
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    whats the site again?
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  4. #4
    1000+ Posts PeterT's Avatar
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    taylor-eng.com

    '92 205 Mi16
    '90 Mi16x4

  5. #5
    1000+ Posts cav91's Avatar
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    Any thing beneficial I can do to the head before dropping it on. How much can you take off it?

    Your site didn't really tell me if anything was interchaingable. But that ok.
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  6. #6
    1000+ Posts Dave's Avatar
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    No you cant really take extra material off the head.

    Only options for increased compression are:

    • thin copper head gasket.
    • decked block and liners - tricky machining check with Peter if he has someone that can do it.
    • new pistons.


    If you get a thinner head gasket, or machine the block/liners Peter used to supply offset cam keys to fix timing.

    Dave


  7. #7
    1000+ Posts PeterT's Avatar
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    Interchangeability? Strange, I thought the info was there.

    XU9J4Z pistons (stamped X) = 9.7:1
    XU9J4 pistons (stamped Z) = 10.4:1

    "The early 1.9L 205 GTi released in Australia was fitted with the XU9J1/Z DFZ engine and had just 8.4:1 CR. The piston in this engine has a 9cc dish, but the compression height is 37.50mm, some 0.38mm higher than the XU9J4 and 1.22mm higher than the XU9J4Z."

    Just get the head reco'd and put it back on. Maybe change inlet cam.

    '92 205 Mi16
    '90 Mi16x4

  8. #8
    1000+ Posts cav91's Avatar
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    Oh yeah sorry I did read that bit. Dunno why it didn't go in


    Anyway yeah I have a fully recoed one I was gunna use on it. Just wondering what sort of money are inlet cam's going for. Regrind I'm asuming.
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  9. #9
    1000+ Posts PugMonkey's Avatar
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    I'm reading this with intrest too as I have a second engine waiting to be tickled.

    So best components would be

    1.9 block with XU9J4 pistons (stamped Z) = 10.4:1

    I also see others stating the crank from another model which intern "strokes" the enging. Whick crank combination is best?

    Not meening to hyjack the thread here...
    ....now watch a Peugeot turn into a corner!

  10. #10
    1000+ Posts 504-504-504's Avatar
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    The Mi16 engine in my 205 has a PeterT stage one inlet cam.
    Highly recommend it.

    Paul

    “A straight is merely the distance between two corners.”

    “Corners: radar free zones.”

    Current: Peugeot 205 GTi Mi16 1987
    Peugeot 205 Si, one red one silver, both 1991.
    Peugeot 504 Wagon, V6 and 5 speed gearbox.
    Isuzu (Holden) Rodeo, 4WD dual cab, extended chassis.
    Past: Goliath, Isuzu Bellett, Austin A30, Peugeot 203, 403, 404, 504,505.
    Subaru 4WD wagon, Toyota Hilux Dual Cab Diesel 4WD.

    Makotrac 205 GTi 06-05-2012 best lap 1 min 20 sec.

  11. #11
    1000+ Posts cav91's Avatar
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    Quote Originally Posted by PugMonkey View Post
    I'm reading this with intrest too as I have a second engine waiting to be tickled.

    So best components would be

    1.9 block with XU9J4 pistons (stamped Z) = 10.4:1

    I also see others stating the crank from another model which intern "strokes" the enging. Whick crank combination is best?

    Not meening to hyjack the thread here...
    Be my guest steal the thread, all is usefull info!
    2011 Renault Koleos manual petrol, yes it's boring, but not as boring as:
    2017 Renault Koleos auto

  12. #12
    1000+ Posts PeterT's Avatar
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    The XU9J4 pistons (stamped Z) are hard to find in Australia. You'd have to buy second hand ones from UK. Even then, the bore of the liners will be most likely worn, making new rings useless anyway. It's far more practical to buy new forged pistons in 83.50mm and get the liners bored to suit.

    You can use the 88mm XU9J4 crank in the XU10J4 block, replacing the standard 86mm crank.

    '92 205 Mi16
    '90 Mi16x4

  13. #13
    1000+ Posts PugMonkey's Avatar
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    Yeah thats what I have heard - Different block though.

    Thanks Peter.
    ....now watch a Peugeot turn into a corner!

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