R8 - R10 - Caravelle - 8 Port head - Black Soot exhaust ports !!
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  1. #1
    Fellow Frogger! R8philSA's Avatar
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    Default R8 - R10 - Caravelle - 8 Port head - Black Soot exhaust ports !!

    Hi Guys

    I am changing over to a twin throat downdraft Weber carbie so today I removed the exhaust and inlet manifolds from the Caravelle (1108cc)

    I was very troubled to find the blackest of black exhaust ports and was wondering if there are any of you out there that can give me any ideas why this should look so bad. The car seemed to be running beautifully and the old Renault muffler/tail pipe is blackish in the tail pipe but not sooty.

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    I have been running on 95 unleaded so wondering if that might cause it.

    What's your thoughts on this, after you take a look at the undermentioned photo.

    Thanks guys

    Phil
    R8 - R10 - Caravelle - 8 Port head - Black Soot exhaust ports !!-dscf2968.jpgR8 - R10 - Caravelle - 8 Port head - Black Soot exhaust ports !!-dscf2966.jpg

  2. #2
    Simon's Avatar
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    It just needs to go for a good drive, it looks like it has likely only done short runs. I wouldn't worry too much about what is there now.
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  3. #3
    Fellow Frogger! R8philSA's Avatar
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    OK Simon, point taken.
    I also thought it might be valve guides allowing oil into the exhaust ports. If I go for a run, stop go shopping, then come back and start her up again she blows a small amount of white smoke. Always a good indication of worn valve guides.
    Trouble with this engine, I haven't really had time yet to go through it thoroughly since I bought it in March, but I intend to do that very soon now.

    Got to have her just right for the spring season, hopefully my wife will be well enough by then to drive it around.

    Thanks for your input

    Cheers

    Phil

  4. #4
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by R8philSA View Post
    OK Simon, point taken.
    I also thought it might be valve guides allowing oil into the exhaust ports. If I go for a run, stop go shopping, then come back and start her up again she blows a small amount of white smoke. Always a good indication of worn valve guides.
    Trouble with this engine, I haven't really had time yet to go through it thoroughly since I bought it in March, but I intend to do that very soon now.

    Got to have her just right for the spring season, hopefully my wife will be well enough by then to drive it around.

    Thanks for your input

    Cheers

    Phil
    Phil,

    Best wishes on the home front, first and foremost.

    I'm with Simon regarding the soot. Just might need a good run. Honestly if it runs well, has roughly even compressions and doesn't knock or use much oil, it might be fine for many, many years. I last overhauled my R8 engine in 1988. They can give a puff of blue smoke on hot startup. White sounds a bit odd. I'd check super-carefully for small bubbles in the coolant, with the cap off the radiator, started from cold, full to the neck, and verify there are no regular small bubbles. It only takes one 2-3 mm bubble a few times a minute to confidently diagnose a slightly dubious head gasket.

    Best wishes
    JohnW

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  5. #5
    Fellow Frogger! R8philSA's Avatar
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    Yes John, I'm a bit off on the colour. It is a bluish whitish puff. Typical of a hot engine oil burning off.
    Cheers
    Phil

  6. #6
    1000+ Posts bluey504's Avatar
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    Give it a damn good thrashing.....or a nice extended run to get everything up to temperature. Blow out the cobwebs and pre-plan any future maintenance issues.
    Mate ran the service department of a Nissan specialist located inner city Melbourne. Nice area and the best repeat customers, Little Old Ladies. Get the car serviced by time more than mileage and always had the same problem, poor running when cold. This always got worse the longer from last service or more to the point sparkplug change or heaven forbid 'clean and gap' nowadays.
    Old mate would idle the car up to operating temp, give it a BIG rev and observe what came out of the exhaust pipe. Often it was a combination of condensation, rust, carbon and small insects. So as to not give the game away the speedo 'may' have been disconnected and a dwell tacho installed so the apprentice could keep within the speed limits whilst doing 4500 rpm to blow out the muck up and down the local freeway.
    Worked a treat!
    Brendan.

  7. #7
    1000+ Posts renault8&10's Avatar
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    The early nissan exa turbos were much the same. Lady owners who putted around and never stretched their legs. The service guys would give them a bit of a thrashing and hand them back running better than ever - until next time. The cars that is, not the owners!
    KB


  8. #8
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    Two similar stories. Back in early 60's worked with an old guy that only ever drove his Morris Minor around town and never even got to the speed limit there. His mechanic told him to drive the car at 60 miles an hour up the highway to Big Hill and back down again. Car was fine after that. Renault mechanic told my daughter to take her diesel Laguna, which she only drives around Sydney, out on to the free way and drive at 100 KPH for 30 minutes and it would run better and clear some filter that was showing as blocked. Apparently it worked.

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