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Thread: Stock convert to alcohol, mehanol / nitromethane

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    Team Member Dvdracing's Avatar
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    Default Stock convert to alcohol, mehanol / nitromethane

    Dearest All,


    What steps to consider if converting stock motor to pro = alcohol / methanol / nitromethane ?

    Regards,
    Dvd

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    As a rule of thumb, the fuel volume is 2.1 times more than gas. So with the same size carb, the main nozzle and main jet must be increased. A typical gas engine is about 6:1 effective compression ratio. For methanol you can run 8.5:1 ECR Spark advance can be advanced as alcohol burns slower.
    When you get into Nitro that is hole different game. Less ECR, less timing. More fuel and you must flush the engine after running as it is very corrosive. To be best you would even run a different pipe.
    What type of engine are you working with?
    Hope this helps.

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    Team Member Dvdracing's Avatar
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    Hi Mike,

    I am working on research converting Yamaha 30hp x 2 cylinders, also plan converting a 56 omc in future

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    Mike covered the main points above perfectly.

    Also keep in kind the following..

    All non metal components in the fuel system must be compatible with methanol.

    The fuel pump and fuel lines need to be of sufficient capacity to flow more than twice the current volume of fuel.

    Needle/seat normally has to be increased as well.

    Be prepared for the added maintenance. Purging the fuel system after running alcohol is recommended. One of my drag racing buddies hooks up a handheld fuel tank with gasoline and runs the engine until it fully purges the alcohol.

    Rob

    Sent from my SAMSUNG-SM-G900A using Tapatalk

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    Team Member Dvdracing's Avatar
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    What power gain to be expect ?

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    Quote Originally Posted by PPRINT View Post
    Mike covered the main points above perfectly.

    Also keep in kind the following..

    All non metal components in the fuel system must be compatible with methanol.

    The fuel pump and fuel lines need to be of sufficient capacity to flow more than twice the current volume of fuel.

    Needle/seat normally has to be increased as well.

    Be prepared for the added maintenance. Purging the fuel system after running alcohol is recommended. One of my drag racing buddies hooks up a handheld fuel tank with gasoline and runs the engine until it fully purges the alcohol.

    Rob

    Sent from my SAMSUNG-SM-G900A using Tapatalk

    All very important points here.
    To convert a modern carb to alcohol is a task. Flushing engine with gas as Rob mentioned is a must. Most fuel pumps won't work for this. That is why Pro engines use a pressure system. An electric pump may be required. Inlet needle seats may need to be custom made. No rubber tipped needles. Main nozzle would need to be custom made.

    Thinking about 70 OMC, I don't think you could get enough fuel into the carb with the small hose fittings they use.
    I found some great fuel line from McMasterCarr for alcohol. I put it on my small gas tank for flushing the engine and it melted. Floats in new style carbs I would not trust with alcohol Tygon yellow hose is very good for both but it is so soft you must be careful it does not kink.

    It might be wiser and cheaper in the long run to modify the engine correctly and run a medium race gas.
    Porting head work and good reeds can gain you like fuel. All that with fuel is even better but not a do it your self program.

    Just converting to Alcohol could add 10-15%. Not really a lot compared to properly modifying an engine at 35% gain of good gas.
    So much depends on the details of you application.

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