Having Trouble with 1950 Vauxhall




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  1. #1
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    Default Having Trouble with 1950 Vauxhall

    I have a 1950 Vauxhall Velox 2.25L straight 6 that performs better with the Choke half out. I have tried everything to get this sorted out. Bought a refurbished Carb from UK. new points, plugs, leads coil, set the timing and still the same problem,
    I must mention here that the spark plugs also carbon up very quickly, I was advised to have the head overhauled which I have now done but still having the same problems, in another discussion someone mentioned if the car runs better with the choke half out this will tell you if its Carb Related.
    What would be the fix if it is carb related, Jetting??
    appreciate any suggestions






    Regards
    Nigel
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    Default Re: Having Trouble with 1950 Vauxhall

    Beautiful machine! I don't know if your can still get LRP fuel in KZN but if you're using ULP, it's advisable to throw a little bottle of 'Valve Guard' by Wynns to every 60 litres fuel.
    Although this won't fix the carb thing, I thought I'd mention it in case you didn't know.

    I reckon your's is a jetting problem. Underfuelling = jets too small.
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    Default Re: Having Trouble with 1950 Vauxhall

    Couple of questions.

    What is the air to fuel mix? Have you had it on a gas analyser?
    What plugs are in the car? Could be they are to cold.
    Are you sure the dwell angle is sufficient/right?
    Have you checked the power on the coil? Is it putting out enough voltage?
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    Default Re: Having Trouble with 1950 Vauxhall

    my guess is vacuum leak somewhere ... in the distributor vacuum advance or brake booster ?

    suppose the "choke half out" means the choke is actually engaged and not just incorrect setting of the choke cable.
    Last edited by RussellF; 2018/08/04 at 08:10 AM.

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    Default Re: Having Trouble with 1950 Vauxhall

    What carb ? Solex? These old engines are not rocket science. As said in this thread make sure timing is 100% spot on.

    Please post a pic of a carboned spark plug.

    Once had a similar problem on an old 3.8 Chevy engine. Later found out it had a carb from a 3.2 engine. Identical looking carbs but different bore and jets. The owners still had the original carb. Sorted out the original one and it was purring like a kitten.
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    Default Re: Having Trouble with 1950 Vauxhall

    Worn spindle shafts on the carb butterflies, causes a lean condition. needs a carb rebuild or a new carb.
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    Default Re: Having Trouble with 1950 Vauxhall

    When you say it runs right with the ckoke out. ! How does it idle without the choke ? If it idles ok with no choke if you try and rev does it struggle ?

    Jelo he said he had a refurbed carb from the UK.
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    Default Re: Having Trouble with 1950 Vauxhall

    Quote Originally Posted by meh View Post
    Jelo he said he had a refurbed carb from the UK.
    then I'd say if it did the same with both carbs, he has an inlet manifold leak
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    Default Re: Having Trouble with 1950 Vauxhall

    Quote Originally Posted by meh View Post
    When you say it runs right with the ckoke out. ! How does it idle without the choke ? If it idles ok with no choke if you try and rev does it struggle ?

    Jelo he said he had a refurbed carb from the UK.
    The idle is great with the choke right in. She revs great until it gets a load then starts backfiring through the carb and looses power, when this happens i pull the choke half out and the motor pulls well

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    Default Re: Having Trouble with 1950 Vauxhall

    Quote Originally Posted by grips View Post
    What carb ? Solex? These old engines are not rocket science. As said in this thread make sure timing is 100% spot on.

    Please post a pic of a carboned spark plug.

    Once had a similar problem on an old 3.8 Chevy engine. Later found out it had a carb from a 3.2 engine. Identical looking carbs but different bore and jets. The owners still had the original carb. Sorted out the original one and it was purring like a kitten.

    The carb is a ZENITH 30 VIG-5 , that is the carb that came with the car. and the same refurbished one I got from UK, the jetting is correct as per the workshop manual.

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    Default Re: Having Trouble with 1950 Vauxhall

    Quote Originally Posted by jelo View Post
    then I'd say if it did the same with both carbs, he has an inlet manifold leak

    When we had the Head redone we checked the manifold for cracks, I even sprayed it all over with the pink spray they use when checking for new pipe welding cracks,
    Nothing came up. the auto advance and retard works well and the carb pumps a burst when you accelerate, it dies not have a brake booster so no leaks there.

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    Default Re: Having Trouble with 1950 Vauxhall

    Quote Originally Posted by nigelgeast View Post
    The carb is a ZENITH 30 VIG-5 , that is the carb that came with the car. and the same refurbished one I got from UK, the jetting is correct as per the workshop manual.
    I don't have an actual pic of the Spark Plug but this is what they look like after about 40 KM, If I go anywhere I take a cleaned set or new or both with me because after wa while the car starts missing due to the plugs being carboned up.
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    Default Re: Having Trouble with 1950 Vauxhall

    I WISH I had an old car like this.
    Cried like a baby when I had to sell my 32 year old BMW 5 Series and again when I had to sell my Ford Ranchero. Both in excellent condition.

    But economics and retirement years combining ...

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    Default Re: Having Trouble with 1950 Vauxhall

    Quote Originally Posted by nigelgeast View Post
    I don't have an actual pic of the Spark Plug but this is what they look like after about 40 KM, If I go anywhere I take a cleaned set or new or both with me because after wa while the car starts missing due to the plugs being carboned up.
    Not sure if you answered all my questions.

    What plugs are those? Run a hotter plug.
    That is way to rich. That plug should be clean
    What is the air to fuel ratuo. My guess would be about 13:1 is what it should be.
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    Default Re: Having Trouble with 1950 Vauxhall

    Quote Originally Posted by Henris View Post
    Not sure if you answered all my questions.

    What plugs are those? Run a hotter plug.
    That is way to rich. That plug should be clean
    What is the air to fuel ratuo. My guess would be about 13:1 is what it should be.
    Yep the jetting is way out if the plugs look like that, and that destroys my running lean theory.
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    Default Re: Having Trouble with 1950 Vauxhall

    Have you confirmed valve timing is good. Check the distributor for worn bushings and pins, distributor cap for arcing and the firing sequence is correct. If still points and condenser confirm the distributor lobes are not worn.


    Yep the jetting is way out if the plugs look like that, and that destroys my running lean theory.

    he needs to make it rich by pulling the choke to run correctly, points to a timing issue imo. spitting thru the carb is the key
    Last edited by RussellF; 2018/08/05 at 02:36 PM.

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    Default Re: Having Trouble with 1950 Vauxhall

    Back firing through card usually points to ignition timing. I would recheck all timing marks. Make sure that when on TDC the timing marks does correspond.
    Make 100% sure you use thecorrect spark plugs. Friend of mine was battling to get a 351C running smooth a few weeks ago. Also backfiring through the carb. We solved the problem by fitting a set of old spark plugs from one of my v8`s.

    I only use AC Delco spark plugs on my v8 engines. The equivalent in NGK and Champion foul very easily for unknown reasons.
    Last edited by grips; 2018/08/05 at 03:40 PM.
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  20. #18
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    Default Re: Having Trouble with 1950 Vauxhall

    In addition to the above, I would just replace the condenser with a new one - it is possible that the new one is faulty. If not faulty you will have a spare for the future.

    Check the plastic insulator where it mounts on the distributor as it could be squashed or hard and brittle etc, check the wire from the insulator inside going to the points. Could be that the lug and/or wire going to the points is worn - the wire could be frayed or the lug will be splayed out, possibly not making proper contact. Check that when you tighten the nut on the outside of the distributor, the bolt pulls tight on the inside. Make sure there is no corrosion on or around that bolt. Remove the rotor arm and add oil or grease inside the top of the distributor shaft - whatever the specs say.

  21. #19
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    Default Re: Having Trouble with 1950 Vauxhall

    Guys
    Thanks for all the advice, I am away from home at present but will certainly try all the suggestions, I will provide feedback once I have resolved or require additional tips
    Regards

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    Default Re: Having Trouble with 1950 Vauxhall

    When buying a new condenser (capacitor), take a test meter with which can measure capacitance. Make sure the new part measures 0.22 uF. due to mass production, they tend to measure around 0.19 uF, or less. And even this could also contribute to your problems.
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