Porsche is working on a two-stroke Diesel engine | FerrariChat
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Porsche is working on a two-stroke Diesel engine

Discussion in 'Porsche' started by Far Out, Jan 11, 2008.

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  1. Far Out

    Far Out F1 Veteran

    Feb 18, 2007
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    Florian
    #1 Far Out, Jan 11, 2008
    No joke. Got it from someone at my university with close links to Stuttgart. They are developing it for a costumer at their engineering center, but the technology is being considered for future road car use.
    For those of you not familiar with the prinicple: Two-stroke engines have the advantage of putting out power every revolution of the crank shaft, whereas the power output of four-stroke engines is limited to every second revolution. Two-stroke engines don't need any valves and overly complicated mechanics, thus can rev higher, are lighter and cheaper. The problem is that you need to mix oil in the fuel and that unburned fuel gets into the exhaust, causing higher fuel consumption and environmental problems. Now Porsche (and other manufacturers) seem to work on those issues. Call BS on it, but as soon as you drive behind a 911 smelling like a deep fryer and sounding like "rangdangdangdang", remember: you read it here first ;)
     
  2. DMC

    DMC Formula 3

    Nov 15, 2002
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    Dean
    #2 DMC, Jan 11, 2008
    You're confusing two-stroke diesel engines with two-stroke gasoline engines. You do not mix oil in the gas in a two-stroke diesel. Two-stroke diesels have to be turbocharged or supercharged. Most locomotive and ship engines are two-strokes, and some large diesels used in yachts.

    http://auto.howstuffworks.com/diesel-two-stroke.htm

    Thanks for the info, though.
     
  3. Far Out

    Far Out F1 Veteran

    Feb 18, 2007
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    #3 Far Out, Jan 11, 2008
    This is of course the case with big engines, but my understanding is that Diesel is too viscous to lubricate a small, high revving engine. But then all my knowledge on the matter is hearsay, so I stand corrected ;)
     
  4. tundraphile

    tundraphile F1 Veteran

    May 16, 2007
    5,083
    Missouri
    #4 tundraphile, Jan 11, 2008
  5. James_Woods

    James_Woods F1 World Champ

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    #5 James_Woods, Jan 11, 2008
    So did DKW at one time (IIRC) - and,

    So do 2-cycle model airplane engines (glow plugs, alcohol + nitro). They normally were generally NOT specifically called "diesel", but there were a few made for special fuels that were 2-stroke diesel; these had an adjustable jack-screw where the glow plug normally was to adjust compression so as to get them started.

    It does occur to me that you might be able to make a 2-stroke with a pressure lubrication system like any 4-stroke engine that does not depend on running the fuel through the crank bearings; no reason you can't have overhead valves, either that I can see.

    I would guess that most 2-cycle engines like a chainsaw, etc. were deliverately made for lightness and that the oil/fuel ported valve approach was the simple way to get the job done...
     
  6. 2NA

    2NA F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 29, 2006
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    Tim Keseluk
    #6 2NA, Jan 11, 2008
    2-stroke Diesel engines are nothing new.

    The "roots type" superchargers used on Top Fuel cars since the 60's were originally designed for 2-stroke Detroit Diesel engines.
     
  7. jmuriz

    jmuriz Formula Junior

    Dec 9, 2003
    395
    Arlington, VA
    #7 jmuriz, Jan 11, 2008
    Yep,
    Just imagine a 911 that sounds like a small s/c'd Detroit Diesel, now that would be cool.
     
  8. James_Woods

    James_Woods F1 World Champ

    May 17, 2006
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    #8 James_Woods, Jan 11, 2008
    No, that would probably suck. And so would the redline.
     

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