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Thread: Petrol and diesel mix

  1. #1
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    Petrol and diesel mix

    Hello,
    Just a general question, does anyone know what happens when you add a little diesel to a tank a petrol? We are not talking about big litres here, just a small amount. What happens to the flashpoint, does it burn hotter or colder? Does it help the valves in older engines? Etc etc. Does it help with vapour lock?
    All feedback welcomed.

    Thanks

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    It could increase the octane .
    If you don't like trucks, stop buying stuff.
    http://www.aulro.com/afvb/signaturepics/sigpic20865_1.gif

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    The other way, petrol into deisel I have heard of, not deisel into petrol thou.

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    Petrol and diesel mix

    The origin of the post is that an old person told me they used to put a little diesel into the petrol in summer to stop vapour lock in the old English cars and trucks.
    But I am just wondering what other effects it would have. But I want to know what effect it will have and not what it may have ( although I am interested in this as well)

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    Had an experience many years ago with mis-fuelling (ground tanks were topped up incorrectly by delivery driver).

    Motor car (petrol) ran pretty rough & smokey on high % of diesel and Servo paid for immediate tank drain and costs. No long-term ill effects.

    FWIW I wouldn't necessarily be using additives in petrol - I haven't otherwise had a problem.

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    G'day

    I have a friend that has his grandfathers 1923 Chevrolet buckboard ute,it has a compression ratio of 4.5:1 and we dilute ULP91 at a rate of 1 gallon(4.5Ltrs) of Kerosine to 8gallons of ULP91.

    Hope that helps

    cheers

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    Quote Originally Posted by UncleHo View Post
    G'day

    I have a friend that has his grandfathers 1923 Chevrolet buckboard ute,it has a compression ratio of 4.5:1 and we dilute ULP91 at a rate of 1 gallon(4.5Ltrs) of Kerosine to 8gallons of ULP91.

    Hope that helps

    cheers
    Kev, given the current price of kerosine he must be an eccentric millionaire. I reckon if you went to buy a drum of kero these days you would need to visit your bank manager first.
    URSUSMAJOR

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    Adding relatively small quantities (<10%) of diesel to petrol is unlikely to have much effect except to make the exhaust a bit smoky for older vehicles. It will drop the octane rating a bit but most cars will cope with that.

    More than that percentage, expect difficult starting, preignition with many engines, and probably, if you do much of it, problems with the catalytic converter.

    Most cars prior to WW2 and a few into the forties or even perhaps fifties would run (sometimes under protest) on lighting kerosene once warmed up. When I was a child a school friend had his family's Ford T tractor conversion - and it was equipped with two tanks - one for the (expensive and rationed) petrol, and one for the (cheaper and unrationed) kero. Being on limited pocket money, we could buy more kero for the quid than petrol, so we ran it a lot on kero, and it was perfectly satisfactory.

    However, when I was working in the gulf country in the sixties, our surveyor accidentally tipped a jerrican of kero into his nearly empty petrol tank on a Landrover 2a, and, while he was able to keep the engine running to get back to camp, it definitely did not like it, and once switched off, the mechanic could not restart it without draining the whole fuel system (it was only after some investigation that the reason for the poor running was found, as kerosene with a small amount of petrol smells like petrol. But the colour is not right!
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

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    Quote Originally Posted by JDNSW View Post
    Adding relatively small quantities (<10%) of diesel to petrol is unlikely to have much effect except to make the exhaust a bit smoky for older vehicles. It will drop the octane rating a bit but most cars will cope with that.

    More than that percentage, expect difficult starting, preignition with many engines, and probably, if you do much of it, problems with the catalytic converter.

    Most cars prior to WW2 and a few into the forties or even perhaps fifties would run (sometimes under protest) on lighting kerosene once warmed up. When I was a child a school friend had his family's Ford T tractor conversion - and it was equipped with two tanks - one for the (expensive and rationed) petrol, and one for the (cheaper and unrationed) kero. Being on limited pocket money, we could buy more kero for the quid than petrol, so we ran it a lot on kero, and it was perfectly satisfactory.

    However, when I was working in the gulf country in the sixties, our surveyor accidentally tipped a jerrican of kero into his nearly empty petrol tank on a Landrover 2a, and, while he was able to keep the engine running to get back to camp, it definitely did not like it, and once switched off, the mechanic could not restart it without draining the whole fuel system (it was only after some investigation that the reason for the poor running was found, as kerosene with a small amount of petrol smells like petrol. But the colour is not right!
    When I was about 16 and too young to get a licence I acquired a 1926 Chev four Capitol buckboard ute. Petrol was 3/6 per gallon and kero was 2/3. I fitted a Kingston dual bowl carburetor from a Fordson tractor along with a gravity feed one gallon tin to warm up on petrol and then swap to kero. There was a Bowden cable apparatus on the carb that turned one fuel off and the other on. Another advantage was that the shire council had a bit of plant that ran on power kerosene and would leave a few drums of it at job sites.

    JD, do you know the difference between lighting kerosene and power kerosene? I assume there was some difference the drums were prominently marked as to purpose.
    URSUSMAJOR

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    Quote Originally Posted by Bigbjorn View Post
    When I was about 16 and too young to get a licence I acquired a 1926 Chev four Capitol buckboard ute. Petrol was 3/6 per gallon and kero was 2/3. I fitted a Kingston dual bowl carburetor from a Fordson tractor along with a gravity feed one gallon tin to warm up on petrol and then swap to kero. There was a Bowden cable apparatus on the carb that turned one fuel off and the other on. Another advantage was that the shire council had a bit of plant that ran on power kerosene and would leave a few drums of it at job sites.

    JD, do you know the difference between lighting kerosene and power kerosene? I assume there was some difference the drums were prominently marked as to purpose.
    It is my belief that power kero is basically avgas BEFORE they add the mixture to make it more explosive. Don’t take this as gospel, but it’s just what I was told by an old bloke

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