Clearing vs Bind Liners?
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  1. #1
    Fellow Frogger! sapito's Avatar
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    Default Clearing vs Bind Liners?

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

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    Im wondering at the bottom of the page what the liner differences are between the 84x84 compared to the 86x84 when it comes to the words blind and clearing?

  2. #2
    1000+ Posts alan moore's Avatar
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    Default

    It is obviously to do with the top of the liner, but I do not know what it is either, except that the standard arrangement is a clearing liner. Maybe it means there is no wide flat ledge for the head gasket to sit on, and only the wall thickness of the liner protruding for sealing purposes.

    If you have looked at these motors, anything over 84mm bore is an extreme compromise. 1860cc is still a fair overbore. 7mm (280 thou) over is a long way from the std 77mm 1565cc.
    '56 Renault 750 (16TS Power)
    '62 Renault Dauphine Gordini
    '89 Renault Alpine GTA V6 Turbo
    '08 Renault Megane sedan

  3. #3
    Fellow Frogger! sapito's Avatar
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    Default 841

    I will go crossflow then with the 841 or 843 block. I found an 841 block on the r18 gts and they are cheap for a rebuild. I found that I will have to run a dry sump unit also which will add to the costs but will be what it needs. Im not sure what the modification will be to the head to run the crossflow head that wasnt designed for "O" ring block hopefully it aint a big deal. Im still interested in getting the 79mm bore to 84 somehow as Ive found that Alfa, Fiat and nissan twin cams have the same hemi head design with 84mm bores also and the toyota 2tc engine also has the same hemi head design but with 85mm bores. Funny thing is all these engines run 42/43 inlet valves and 36 exhausts. The toyota donk looks almost identical to the 807 and I think its a copy for sure. But in Puerto rico theyre making 7 second passes with them in startlets and big boosted snails... thats where also the hemi design excels.
    I will have to get billet rods to suit the more common forged pistons from a nissan ca18 engine which has the 84mm forged ones commonly available and cheaply. So even though the rods will be pricey the pistons wont. I just have to now measure it all up.

  4. #4
    1000+ Posts alan moore's Avatar
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    Why the dry sump? A small gain for a large outlay.
    '56 Renault 750 (16TS Power)
    '62 Renault Dauphine Gordini
    '89 Renault Alpine GTA V6 Turbo
    '08 Renault Megane sedan

  5. #5
    Fellow Frogger! sapito's Avatar
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    Default Dry sump

    To clear my crossmember which I cant modify. i looked at moving the oil pump pickup forward away from its centrally location but will require careful welding and new sump. I figured that with a 3 stage pump I scored a while back It might be the key to also locate the engine lower down for handling.
    I also wanted to tilt the engine to angle the ports better but does anyone know of any possible oil pressure problems?

  6. #6
    1000+ Posts alan moore's Avatar
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    What are you wanting to put the motor in?
    '56 Renault 750 (16TS Power)
    '62 Renault Dauphine Gordini
    '89 Renault Alpine GTA V6 Turbo
    '08 Renault Megane sedan

  7. #7
    Fellow Frogger! sapito's Avatar
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    So far...
    1967 Datsun 1000 coupe. Factory weight 625kg currently 593kg with worked a14 twin 44mm solex mikunis and close ratio 4 speed. RWD with shortened alfa 105 gtv finned alloy sumped differential with adjustable torque bias LSD currently set at around 40%.
    All steel body and full glass. Watanabe magnesium wheels and toyo lightweight tyres, lightweight kevlar reinforced race seats and other mods to keep weight down without compromising strength.

    Future mods:
    hopefully reduced a further 45-60 kg
    using custom lightweight doors,
    Lexan MR10 rear windscreen,
    rear side windows and
    aircraft type sliding windows for doors.
    841/843? 807? taken to 84mm bore? 68kg
    (my A series comes in at 94kgs!!! )
    Toyota 24kg t50 close ratio split case box
    lightweigh composite mono leaf rear springs
    billet dual way motorbike coilovers.
    Lift off fibreglass bonnet, guards and boot.

    Aiming at final weight of under 580kgs with around 180hp.
    Since renault controls nissan its not straying too far from home.
    Last edited by sapito; 8th October 2004 at 11:28 PM.

  8. #8
    1000+ Posts alan moore's Avatar
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    An 807 is a light motor but, and I know everyone has done it before, a C18 Turbo is surely a better way to go. Modern, and 300 Hp available with work, would surely overcome the weight deficit, to become an 11sec animal.

    Or just a well sorted L20, stroked with a Z20? crank to get about 2340cc and a lazy 200+Hp, although the height might beat you. I have seen the L20 in 1200s but not a 1000.
    '56 Renault 750 (16TS Power)
    '62 Renault Dauphine Gordini
    '89 Renault Alpine GTA V6 Turbo
    '08 Renault Megane sedan

  9. #9
    Fellow Frogger! sapito's Avatar
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    L20 are 138kgs with twin webers almost double the 807.
    Turbo is always good but I love NA and no pollution gear.

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