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Thread: "Inventing" a "New Multi-Fuel Engine"

  1. #31
    4 Star General Hammer's Avatar
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    Figured you did, but wanted to make it clear for anyone who didn't.

    Actually, an engine has some other dynamics that can play into this even more.
    Like the 2nd upward travel of the piston. Leaving enough volume to compress will help soften the 'snap' that the rod/pin/piston sees. Granted, this is mainly an issue at higher rpm, but it does affect longevity on any engine.

    We really would want the lowest compression possible that would be able to start and idle with assorted fuels.
    But seeing as a lot of people have run a lot of stuff through their trucks, and at some cold temperatures as well, it would seem that the CR of the MF is probably fairly close to where we would actually want it.
    Fyi, a lot of indirect injection diesels are between 18:1 and 23:1 for the CR. So, there should be a good number out there that already have a start on the compression side, and having internals that are designed to handle the higher compression.
    Problem lies in the head and piston design for those engines. Not exactly a good match up to actually copying our MF design into.
    Of course, those same engines already run darn well on a lot of the heavier fuels we put in them. Just stay away from too much gas, etc....

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    4 Star General jesusgatos's Avatar
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    ...and the only thing to be gained by reworking the head/s injectors would be the ability to burn gasoline? Bah. Personally would rather just optimize the fuel system to burn the alternative fuels that they seem to already tolerate fairly well.
    no longer an active member on this forum

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    4 Star General Hammer's Avatar
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    Well, we happen to like to 'thin' our heavy oils with gas. So having the engine burn it as well is a safety issue as well as a multi fuel issue.

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    You are right though, it would only take so much reworking on the existing engines to make them more 'tolerant' of other fuels.

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    3 Star General dozer1's Avatar
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    Would the computer controlled engines do a better job of efficiently burning sayyyy 50/50 diesel / filtered WMO or the older mechanical diesel be the better bet? (I bet a guy could get away with that in a moderately warm climate with little or no mods)

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    Still being new to this,I would rather see a reliable flow
    of new parts to keep these multi fuels going than trying
    to re invent the wheel. Maybe improve a way to cut down
    on the smoke?

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    4 Star General Hammer's Avatar
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    Cut down on smoke and run smoother.
    Easy, swap on a newer turbo with a waste gate. Don't try and make a ton of boost, just make the boost come in a lot sooner, and let the wastegate bleed off the extra at the higher rpms.
    Or just turn down your fueling a little

    As for 50/50, they can run more then that. But that ratio is done quite a bit already in the CUCV setups we already have.
    Honestly, when it comes to the heavier fuels we use, a LOT of diesels that are mechanical can run them just fine. They start a little harder, and you can't let any of these things get cold and sludge up the filters, injectors, etc.

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    4 Star General Hammer's Avatar
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    Check this out!
    New technology turns petrol engines into low compression diesel!
    Different idea to get the same affect that we are after.
    Now, put that piston in a simple engine like the 6.2 and have fun!

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    Abert (04-12-2011), dozer1 (04-12-2011), oldMan99 (04-13-2011), Wolfen (04-12-2011)

  10. #39
    3 Star General dozer1's Avatar
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    Thats pretty darn interesting! SONEX RESEARCH I wonder what engines they have these available for. If it says, I missed it. If for the small block chev (SBC) just about anything else you could ever possibly need is available...Making it a good off the shelf find...I need to read more about this.

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    "The short duration of SCAI combustion as validated by the rate of heat release supports the
    goal of reaching 400 Hp at high rpm with an engine displacing 3.2 liters." Quoted from one of their PDF's. Thats enought to power a Duece, and at 3.2L you could mount two of them together and put them in tractor trailers. Dang.
    Glad to be here and I am trying to learn as much as I can.

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