Valve clearances
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  1. #1
    1000+ Posts Luca's Avatar
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    Default Valve clearances

    Well as you can probably tell by the title I've got a question about valve clearances....

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    The ideal exhaust clearance on a 205 is between .013 and .018. Now the cam card says that it should be set at .012 thou.

    My car has them at .010 and .011 thou. Is .002 thou a big amoutn and should this be adjusted accordingly?

  2. #2
    1000+ Posts Luca's Avatar
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    Anyone?

  3. #3
    1000+ Posts Haakon's Avatar
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    a bit tight mate. The gaps close up a lot when the valve stems heat up and you run the risk of having a valve not shut. Plus, it throws the valve timing out a bit.

    Set it so the feeler gauge (use the lower end of the scale) is snug to tight fit b/t valve stem and rocker. It takes a bit of trial and error as you will find the adjustment changes when you tighten the nut and you have to initially set it to make the feeler gauge very tight to compensate. Its a bit of a knack but not hard.

    Just realised - this is assuming rockers - does a 205 have them or is it a shim between cam and valve job?

    There is a lot to be said for hydraulic lifters
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

  4. #4
    1000+ Posts Dave's Avatar
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    Hey luca,

    Here is the haynes pdf you need, has instructions and measurements.
    Haakon - no rockers just cam on bucket and shim.
    http://www.members.optusnet.com.au/d...s/0932-02B.pdf
    Dave


  5. #5
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    Luca, you'll find that the .013" is the 'safe minimum' to allow for common error. Once you go into a new cam profile, 'they' assume you're more careful about the accuracy of your settings so they recommend a smaller clearance to get the absolute max. in lift. I wouldn't go any smaller than 0.12" unless someone like Peter T has tried it and recommends it. Should be a pretty stiff sliding fit if you're using feelers.

    Stuey

  6. #6
    1000+ Posts Luca's Avatar
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    Thanks Dave that was a great read.

    I've got the measurements and imagine your facing the engine standing in front of the car.....

    Exhaust Inlet Inlet Exhaust Exhaust Inlet Inlet Exhaust
    .011 .007 .008 .012 .011 .009 .008 .011


    The valve clearances stated to be ideal are:
    Inlet Exhaust
    0.006 - 0.010 0.013 - 0.018

    My cam card says:
    Inlet Exhaust
    .010 .012

    MY QUESTION IS:
    My inlet clearances are on average 2 thou out according to the cam card... am i doing damage to the engine??

  7. #7
    1000+ Posts Dave's Avatar
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    Hey luca, your inlets are fine, but your exhausts should be .35-.45mm which is 0.0137' to 0.0177 thou.
    I would adjust the exhausts. They are a little too close.


    Dave
    Last edited by Dave; 7th May 2004 at 09:01 AM.


  8. #8
    1000+ Posts Luca's Avatar
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    Is this the case even though my cam card says 0.012 for the exhaust?

  9. #9
    1000+ Posts Dave's Avatar
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    Those are the clearances that Peugeot designed the head to use. I would rather use their figueres than that of a cam manufacturer. If you want more lift it should be in the cam, not making the clearances smaller.

    Dave


  10. #10
    1000+ Posts Luca's Avatar
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    Dave how serious is that 2 thou coz realistically i can't get this fixed for another 2 to three weeks?

  11. #11
    1000+ Posts Dave's Avatar
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    Your not looking at any short term damage as far as I know. Its not urgent but i'd look at rectifying it when you get the chance.
    How much lift does your cam have?


    Dave


  12. #12
    1000+ Posts Luca's Avatar
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    Dude the cam card is at home i'll PM you if u're interested....

    Have u got any other chapters of the HAynes manual lying around?

  13. #13
    1000+ Posts Dave's Avatar
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    Luca,

    I have most chapters of pug 205 and cit bx, and i think even i have pug 405 man in pdf's at home. I'm at uni at the moment, but if you mention what you need i'll have a quick look and upload it when i get home.

    Don't worry about the cam specs, just interested to see what different people are using.

    Dave


  14. #14
    1000+ Posts Luca's Avatar
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    Mate i'll have it all! Everything! The whole block and dice... can u email it to me?

    From memory it's 290 of lift and 190 of duration...

  15. #15
    1000+ Posts Dave's Avatar
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    I'll see how big it is, may be too big to email. If that is the case i will host it and give you the link to download (i'll zip it up so only one download).


    Dave


  16. #16
    1000+ Posts Luca's Avatar
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    Thanks dave.

  17. #17
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    Quote Originally Posted by Dave
    Those are the clearances that Peugeot designed the head to use. I would rather use their figueres than that of a cam manufacturer. If you want more lift it should be in the cam, not making the clearances smaller.

    Dave
    Yeah, I agree, actually, even though what I said above suggests the opposite. Thinking about it if it were my car I'd stick with the minimum factory clearances too, not the cam guys optimum.

    Luca, you'd only get problems with your current settings if you get maximum heat into the head. Just don't overdo it until you've sorted them and you should be right...

    Stuey

  18. #18
    Tadpole
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    Default Been there, done that, try panadol.

    After spending the last 4 weeks stewing over the same issues I think i can help. My engine is also a 205gti 8v and I put a non standard cam in it. I spoke to Clive Cams in Melbourne (owned by the guy who used to be partners in Wade cams) and he said the following.....

    The clearance specified on the cam data tag is supposed to be the running clearance when the engine is hot. The clearances are dictated by the cam lobe profile and can be greatly different from one cam to another, even if its in the same head. (i.e. haynes specs are probably no longer applicable.) The hot clearances must be set to within 1 thou of specified clearance, perferable with the exhausts 1 thou larger and the inlets 1 thou smaller. If the engine is going to be worked hard, the exhausts may even have another 1 thou added for further valve expansion not present in a stationary hot engine.

    Therefore, if your cam tag says 12 thou and your planning to drive the engine hard at any stage... go 11thou on inlets, 14 thou on exhausts and remember, these are for a hot engine! Clive cams couldn't stress that point enough!

    I know it's stategically anoying but have patience, it pays off.

    For the cam i just put in, it specified 16 thou. I did everything according to these instructions and even i'm supprised at how quietly the cam operates (no tappy tappy noises) even though it has 18 thou on the exhausts when hot!

    If you don't think you can be bothered doing it properly and your going to hazard a guess at how much the valve stems expand... i've found that my exhaust valves grow 6 thou more than the head and the inlets don't change or maybe even shrink a thou. (avoid the easy path though!)

    Good Luck, Matt.

  19. #19
    1000+ Posts Luca's Avatar
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    Thanks guys.

    My clearences were measured when the eng. was cold so would this shortage that i have when the thing is cold increase to the correct clearences when it's hot?

    Matt does this guy Clive adjust clearences?

  20. #20
    1000+ Posts alan moore's Avatar
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    You should definately set the clearances as the cam grinder has instructed, as the new cam has a new ramp design, and so the Pug numbers don't count.
    Not too hard to do the clearances (2 Hours) but you will need a micrometer and someone to surface grind the shims, or buy new ones from Peugeot. Sometimes you can swap the shims around to get the desired clearance.
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  21. #21
    Fellow Frogger! sapito's Avatar
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    Default piston from meca

    Didnt want to create a new post
    Does anyone here know if the forge piston price is for one unit in euros??
    part MP0347 the one with the photo?

    http://www.mecaparts.com/Moteurs/R12page1.php3#ok

  22. #22
    1000+ Posts Luca's Avatar
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    Thanks Alan.. so the clearences that i have posted above were measured cold and therefore i assume would be correct if the engine was running hot?

  23. #23
    Tadpole
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    Default Getting back to the clearances...

    I think clive would do anything u wanted. They do losts of unique specialised stuff but usually at a price. Wade cams told me about a place that made and ground shims but I've forgot the name of the place. I think they were about $10 each. I did mine myself (my father operates an engineering firm in Bendigo) and they're not too difficult to do if u have access to a surface grinder. Matt

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