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Thread: crankshaft

  1. #1
    Fellow Frogger! bingham driver's Avatar
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    Default crankshaft

    Hi guys & gals, would anybody have a Virage crankshaft (847) in good condition, the LH sweeper at winton wasn't kind to mine.

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  2. #2
    COL
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    Default Regrind

    Hi bingham driver

    Is the crankshaft to damaged for a regrind???
    Regards Col

    1973 Renault R12 Station Wagon
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  3. #3
    Fellow Frogger! bingham driver's Avatar
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    No its not too far gone if they can take out the .010thou bend first.
    Just might be a cheaper option to go good 2nd hand if available.
    Once I thought I was wrong but, I was mistaken

  4. #4
    1000+ Posts Frans's Avatar
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    It sounds like you don't have a baffled sump, or the baffles are not good enough. Extreme care needs to be taken when baffling a Renault sump.
    Regards
    Frans.
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  5. #5
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    frans, purely as a matter of interest, what is the connection between a bent crank, and lack of baffled sump?
    ta

  6. #6
    1000+ Posts Frans's Avatar
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    Alexander,
    I think it is the result of oil shortage causing the bearings to seize and the the momentum of the car forcing the engine to rotate and the crank trying to stop the rotation. That will bend the crank.
    Sierra sumps are notorious for oil surge because they are so flat. A Ford Kent engine has a small bowl where the oil pickup is located and that bowl helps in keeping the oil at the pickup. A renault sump is shaped in a plain flat way and the oil can run from one end to the other and side to side without any restriction.
    Frans
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  7. #7
    Fellow Frogger! R8 Dream's Avatar
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    Frans,
    So would running a sump likle this from Mecaparts solve the oil surge problem?

    http://www.mecaparts.com/PhotosPieces/mp0904.jpg

  8. #8
    1000+ Posts Frans's Avatar
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    My opinion? No, or maybe just. It will be a border line. But then I haven't used any of those. The story is that with standard road tyres the adhesion is of such that when the car was designed the tyres available will loose grip and slide before oil surge damages the engine. Then tyres got better and G forces became more. Now the oil is flung to the sides and creeps up higher than before. The pickup might just be below the oil level which means you are still OK. But when you fit slicks or DOT rated racing tyres the G forces becomes much higher. The oil runs away from the pickup and you run bearings on your car within the first 4 - 5 seconds. It is instant engine damage.
    The sump in the picture looks OK for braking and accelerating but what is helping to keep the oil in when cornering to the right? It will run right past the pump and sit on the wall of the sump away from the pickup.
    The guys with the Pug MI16's have a similar problem. It can be cured but needs a lot of work.
    Frans
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  9. #9
    Fellow Frogger! bingham driver's Avatar
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    Thanks, no I didn't have a baffled sump but it won't be going back together 'til I have. Actually I saw a standard Honda civic sump just the other day & I think their idea is great, they have a plate 1/2 way down from the crank, sloped towards the middle where the pick-up sits. Any oil that runs into that hole can get out ONLY by being pumped out, like it. Seems easier than building a box with 4 flaps.
    Anyway that doesn't get me a crank, looks like its straighten & grind time.
    Once I thought I was wrong but, I was mistaken

  10. #10
    1000+ Posts schlitzaugen's Avatar
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    I was going to suggest you have a look at the Civic baffles too. Was impressed a little consumer market car like that has such a good baffle.
    ACHTUNG ALLES LOOKENPEEPERS

    Das computermachine is nicht fur gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitssparken. Ist nicht fur gewerken bei das dummkopfen. Das rubbernecken sightseeren keepen hands in das pockets-relaxen und watch das blinkenlights.

  11. #11
    1000+ Posts Frans's Avatar
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    Could you explain or make a drawing please? I checked Google but they only show modified ones. Makes me wonder why do they modify it if it is good.
    Frans
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  12. #12
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    Quote Originally Posted by bingham driver View Post
    Hi guys & gals, would anybody have a Virage crankshaft (847) in good condition, the LH sweeper at winton wasn't kind to mine.
    problem solved I hope; I've sent you a PM. cheers! Peter

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