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Thread: Bio-diesel

  1. #1
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    Default Bio-diesel

    Hi
    Anyone used bio-diesel in their motor? (diesel obviously).Any advice? Stay well clear or whatever.
    Ta
    Johny

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    Regular Member Gsi3.2's Avatar
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    if it's a cdti engine then it's a big no, unless you mix it with normal diesel at a ratio that makes it not worthwhile..

    you can't use it in high pressure common rail diesels.. But if you've got a DTi engine, then it'll like it a whole lot more..

    don't run on 100% bio..mix it with 20% normal diesel..

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    Regular Member benny's Avatar
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    yep seen it in a vectra at work did 5k of damage .................you have to watch where you get it from it is ok if it is common rail compatable but dont buy the cheaper stuff (even tho thats the idea)

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    Thanks for the speedy replies....mines a CDTI so i guess i ll give it a miss then

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    Regular Member G.O'Rilla's Avatar
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    I think there are other threads on this as well, but here is my two pennies worth. All modern diesel car engines here in Europe are designed to work with fuel that meets EN590. Pure biodiesel (which is commonly referred to with names such as fame - short for the chemical name) should meet the ISO or ASTM spec for this but to be sold for road use must meet the EN spec above also. I know that things work a little differently in Northern Ireland, but the same rules apply even there.

    If you buy "biodiesel" at the pumps it will almost certainly be B20 which is 20% biofuel, which the industry reckons is the optimum level due to various factors including supply and demand. Research has found that greater levels of biodiesel are not good for the engine:

    1) Cold properties - The CFPP (cold filter plugging point) is higher than mineral diesel - it doesn't take a rocket scientist to work out why that it bad
    2) Biodiesel above 20% is a wonderful solvent - it will destroy the seals in the fuel system. I think the whole public transport system in Cleveland or somewhere collapsed when they tried B100 in their busses.
    3) Because of the above it will also carry all the rubbish out of your fuel system and clog the filters very quickly
    4) have a look at www.biodiesel.org and specifically http://www.biodiesel.org/pdf_files/B...0_20_Final.pdf
    for more information. It is an american site but very much the industry reference.
    5) Your warranty will be invalid. Biodiesel smells different to mineral diesel - it is quite noticeable and in the event of an engine failure, they WILL look for this.

    If you value your engine, don't be tempted to buy fuel from Fred up the road who has his own biodiesel plant (it is VERY easy to make) - it will likely end in tears.

    No doubt we will see many stories posted of people who have run their cars on recycled chip fat for 95 years without any trouble, but if they have then they are very lucky. Modern high performance engines are fuel critical beasts and all of the motor manufacturers spend a fortune with companies like mine carrying out massive testing regimes to ensure their engines work with the fuels specific to each country.

    P.S. Why spend upwards of £15-20K on a car, another 2K+ on goodies and then take the chance of wrecking your pride and joy by saving a few pence per litre on fuel? Stick to EN590.
    Last edited by G.O'Rilla; 23rd September 2006 at 09:22.

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    Or buy one of those Swedish cars that will run on anything that looks even remotely like fuel

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    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : 3.2 V6

    Year : 04

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    Default

    A very good write up there..

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    Nice post G O'Rilla....when a few people said they were paying around 88p a litre for it i did wonder for the extra 5p a litre if it was worth it.
    Johny

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    Vehicle : Vauxhall

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    Default

    I know that veg oil will run fine in DTIs with a 50-50 mix because I did said but I don't know about the CDTI, what's the flash point of diesel and veg oil?

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    Regular Member G.O'Rilla's Avatar
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    Thanks for the responses. Flash point will not (or rather should not) be an issue, should be well over 60 deg C. Don't be too tempted to mix kerosene with diesel either - it will burn but the ignition properties aren't that good......

    Once again there is nothing wrong with Biodiesel (B20 = 20% biofuel), in fact it is a good thing, but home brewed stuff which may be cheaper but may be very expensive in the long run. If anyone is interested I can show some really sludgy samples of 100% biodiesel, which you wouldn't want anywhere near your pride and joy. Next time in the office I will try and remember to get some piccies and post them.
    Last edited by G.O'Rilla; 23rd September 2006 at 15:25.

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