R8G 1134 minimum head thickness
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  1. #1
    Tadpole
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    Default R8G 1134 minimum head thickness

    can anyone give guidance on minimum head thickness for R8 G 1134 heads and when to use thicker head gaskets....

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  2. #2
    1000+ Posts Frans's Avatar
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    I have nothing in writing but I am still using them at 71mm. (that is 1255 or r1135 heads.)

    I would cc the combustion chamber and see what the compression ratio turns out to be and if it is in the region of up to 11.5:1 I would still use it on 98 pump fuel. I would rather decrease the dome a little than using a thicker gasket only because I think a thick gaket will burn on its fire rings easier.

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    Frans.
    Old enough to know better
    Young enough to do it anyway.

  3. #3
    Simon's Avatar
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    According to the MR97 R1134 factory manual:

    Head height, 73mm
    Minimum head height, 72.8mm
    Combustion chamber volume (with sparkplug and valves in place), 36.8 cubic centimetres
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  4. #4
    Tadpole
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    Default thanks for the specs

    thanks for the responses:
    I have found and accumulated four heads over the years with all being at the bottom end of the range, several are in really poor condition.
    In desperation I just bought one from a guy in France for premium money, around $2K. He promised me it was as new, but on arrival it too is only a bit over 71mm but in good condition and probably the one to use in a rebuild of one of the engines I have. I need it for an 1134 rebuild project I will start soon.

    By coincidence I met a guy in the States in 2002 who had five heads, two brand new in factory boxes, two engines and a couple of cars (the 1134/35 engines were popular in speed boat racing apparently). He let me have a couple of the worst heads but wanted to keep his others for projects. He has since (sadly) let them all go and having lost my contacts couldnt let me know they were up for grabs...

    Great guy though. so like every other Gordini 8 lover Im still hunting a goodie.....

    cheers and thanks.

  5. #5
    Fellow Frogger! alpinesau's Avatar
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    Colombo in France is making brand new cylinder heads made using original tooling, but with the latest alloys.
    From all accounts, they are very good and relatively inexpensive (~ 3k Euro I think).

    I also know of someone in Melbourne who had the complete cylinder head mating face built up with weld to obtain the correct thickness. It worked out OK.

    Robert
    1970 R8 Gordini R1135
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  6. #6
    VIP Sponsor 59 Floride's Avatar
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    These heads are currently available fron Spain...[email protected]
    Attached Thumbnails Attached Thumbnails R8G 1134 minimum head thickness-captureufgjh.jpg   R8G 1134 minimum head thickness-ggjk.jpg  

  7. #7
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by alpinesau View Post
    Colombo in France is making brand new cylinder heads made using original tooling, but with the latest alloys.
    From all accounts, they are very good and relatively inexpensive (~ 3k Euro I think).

    I also know of someone in Melbourne who had the complete cylinder head mating face built up with weld to obtain the correct thickness. It worked out OK.

    Robert
    Are they not R1135 heads? I'm not sure of the difference though.

    Building up makes a lot of sense - quite a job with finishing afterwards though. Never throw a head away!
    JohnW

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  8. #8
    Fellow Frogger! alpinesau's Avatar
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    There are a few small differences between the R1134 & R1135 heads. The main one being the spacing of the combustion chambers.
    The R1135 has the distance between the bore centrelines equal, whereas the R1134 has the centre 2 cylinders a little closer together.
    You may recall that the R1135 conrods (and R12) are offset to make the bores evenly spaced.
    The R1134 & R8 are not.

    The other difference is that the very late R1134 & all R1135 heads were strengthened around the rocker gear posts.

    I did fit a 1135 head on a 1134 bottom end without too much bother. If I recall, I had to use an 1135 head gasket, and maybe I had to grind the combustion chambers slightly.

    Robert
    1970 R8 Gordini R1135
    2005 Megane 225 Cup
    2008 Clio X85 Cup Racer
    2014 Megane RS275 Trophy R
    2015 Koleos Expression

  9. #9
    Fellow Frogger! Paul T's Avatar
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    Default 1134 head

    There is a complete but un-assembled 1134 engine in the up coming Renault/Gordini parts sale at my place in Bathurst. I have not yet seen the engine and don't know the condition only that it is complete. When I see it I will measure the head thickness and let you know.

    Paul.

    Paul Tomlinson
    R1135 Gordini 1968.
    Jaguar XJ-C V12 1975.
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