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Thread: oil/petrol blend question

  1. #1
    Join Date
    Jun 2007
    Location
    brisbane
    Posts
    81

    oil/petrol blend question

    Hi I had an old nissan 2.7 turbo that ran like a charm on vege oil but it died and I found another car of the same model but it unlike the original doesn't seem to like vege oil as much. I used to mix 2litres of petrol to 20 litres of oil in the old car and I am thinking of changing blends for new car to 3 or even 4 litres of petrol to 20 litres of vege oil as I have found it struggling with pushing the original blend. Any opinions regards this idea? is adding 3 or 4 litres of petrol to the 20 litres of oil going to cause any long term issues...cheers. Also as a means to lower viscousity is a litre of petrol better than a litre of diesel
    Last edited by artrix; 5th December 2017 at 11:19 AM.

  2. #2
    Join Date
    Apr 2007
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    numurkah
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    521

    Re: oil/petrol blend question

    It may have a blocked filter or air leak.

  3. #3
    Join Date
    Jun 2007
    Location
    brisbane
    Posts
    81

    Re: oil/petrol blend question

    No checked all than I added some diesel and it ran sweet...just think this car likes it a bit thinner than the old one

  4. #4
    Join Date
    Nov 2005
    Location
    Tasmania
    Posts
    500

    Re: oil/petrol blend question

    There have been many discussions over the years regarding blending with petrol or dino, everyone seems to have their own idea's and experiences. Personally, use dino/bd for thinning vo, seen to many problems over time using petrol, including blockages and failed engines.

    Diesels were originally designed to run on peanut and other seed oils, it was only when fossil fuels became very cheap and accessible, that they changed to diesel. Petrol is designed for combustion engines, not compression engines, using dino as a thinner gets much better results and may save your engine from an early grave, or malfunction.

    If you use a two tank system and use dino as a thinner, if you have a fuel problem, you can switch to dino. If you are thinning with petrol on a single tank, you are stuck, but if using dino and a two tank system, you just switch tanks and continue. There have been many times when had to run on the starter tank, but I travel a real lot, so take probably more precautions than most.

  5. #5
    Join Date
    Sep 2005
    Location
    WA
    Posts
    4,095

    Re: oil/petrol blend question

    The issues that I suspect will limit your blend are:
    1. Vapour lock - With too much petrol on the fuel, you will have difficulty with hot starting. The petrol vapourises in the injectors, lines and IP, meaning that you need to crank the engine more to compress and condense the petrol so it can be injected.
    2. Lubrication - Is this a rotary IP? If so, lubrication of the IP internals is done by the fuel, which if vapour lock is present may mean zero lubrication of the IP.

    The fact that your engine will not continue to run with a looped return leads me to suspect that you have an air leak in the fuel system and the air is unable to be expelled to the tank, resulting in a build up of air, causing fuel starvation. This could be made worse by a fuel restriction upstream of the air leak.
    I recommend that you use transparent hose in the looped return, to ensure that air is not present, at least until you have it sorted.
    The fault will be a simple one. The hard part is finding the location of the fault.
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles in stable:
    '85 Mercedes Benz W123 300CD Turbodiesel single tank using 95% used cooking oil and 5% to 10% misfuel (where someone had filled diesel vehicle with petrol).
    '06 Musso Sports Crew Cab. Running on used cooking oil with 5% to 10% misfuel.
    Toyota Camry Hybrid - (Wife's Car)

    Previous Vehicles:
    '90 Mazda Capella. (2000 - 2003) My first Fatmobile. Converted to fun on veggie oil with a 2 tank setup. Died when supercharger stuck at max boost for weeks. Stretched head bolts.
    '80 Mercedes 300D. 2 tank conversion [Sold]
    '84 Mercedes 300D. 1 tank, no conversion. Replaced engine with rebuilt OM617A turbodiesel engine. Finally had good power. Donor for current Fatmobile coupe. (body parted out and carcass sold for scrap.)
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car)[sold]
    '98 Mercedes W202 C250 Turbodiesel (my car)[sold]
    Parts Car C220 1993 All body panels, headlights, interior engine and ECU available.


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  6. #6
    Join Date
    Jun 2007
    Location
    brisbane
    Posts
    81

    Re: oil/petrol blend question

    Thanks for replies I must admit tony your response has left me scratching my head a bit, you obviously have a lot more knowledge about using svo than I do

  7. #7
    Join Date
    Sep 2005
    Location
    WA
    Posts
    4,095

    Re: oil/petrol blend question

    Quote Originally Posted by artrix View Post
    Thanks for replies I must admit tony your response has left me scratching my head a bit, you obviously have a lot more knowledge about using svo than I do

    I have made a lot of mistakes in the past 17 years using veggie oil and since joining this forum I have learned a lot more from the contributors here.
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles in stable:
    '85 Mercedes Benz W123 300CD Turbodiesel single tank using 95% used cooking oil and 5% to 10% misfuel (where someone had filled diesel vehicle with petrol).
    '06 Musso Sports Crew Cab. Running on used cooking oil with 5% to 10% misfuel.
    Toyota Camry Hybrid - (Wife's Car)

    Previous Vehicles:
    '90 Mazda Capella. (2000 - 2003) My first Fatmobile. Converted to fun on veggie oil with a 2 tank setup. Died when supercharger stuck at max boost for weeks. Stretched head bolts.
    '80 Mercedes 300D. 2 tank conversion [Sold]
    '84 Mercedes 300D. 1 tank, no conversion. Replaced engine with rebuilt OM617A turbodiesel engine. Finally had good power. Donor for current Fatmobile coupe. (body parted out and carcass sold for scrap.)
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car)[sold]
    '98 Mercedes W202 C250 Turbodiesel (my car)[sold]
    Parts Car C220 1993 All body panels, headlights, interior engine and ECU available.


    Searching the Biofuels Forum using Google
    Adding images and/or documents to your posts


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