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    • CommentAuthorgbritnell
    • CommentTimeFeb 24th 2010
     
    Gentlemen, I finally got around to sending David some information and pictures of my V-twin engine. He has put the particulars in the Gallery under multi-cylinder engines.
    gbritnell
  1.  
    George, Great looking engine you have designed. I hope it runs as nice as it looks, looking forward to seeing and hearing it run ! ! !
    Should have a nice sound to it. Keep up the great work. Are you going to make plans available as well?

    Jan
    Norway
  2.  
    Hello George....That is a sharp looking engine, and you do amazing work on your engine building.......A man who works with his hands is a laborer....A man who works with his hands and his head is a craftsman......A man who works with his hands,head and his heart, is a artist........Dale
    • CommentAuthorgbritnell
    • CommentTimeFeb 26th 2010
     
    Thanks Jan and Dale for the nice comments. Jan, I have a set of drawings for the engine. When I complete the engine the drawings will be up to date. There are currently 14 sheets in the set and they will be for sale.
    Dale, I should be able to see if this thing will run sometime next month. It will have a waste spark on the intake pulse of the rear cylinder. Being as there won't be any compression it shouldn't be a problem but having never built anything like this I'm not sure. If it does give me problems I will have to add a second Hall effect trigger to the timing system and another ignition system. I purchased a double fire coil from Jerry Howell a few years back so I have a coil that is adequate but as I stated, I'm not sure of the physics of it. I'll let you know.
    gbritnell
  3.  
    George:
    I've built three engines using the waste fire firing mechanism, one of them Bob Shores Silver bullet, Wallaby from Westbury and and old two cylinder I rebuilt from about 1940's.
    All of them have something in common, the two pistons reach TDC and BDC at the same time, which I think is the case in your engine with fork and knife connecting rods.
    Even when the two pistons are reaching TDC at the same time, they do at different timing ( valve train) wo while one reaching TDC in time for spark ( exlposion), the other one is reaching it at an overlap point where exhaust is reaching the end and intake is beginning to open.
    I've used with success trigger for spark driven from Crankshaft ( once every turn single magnet) and camshaft (two sparks per turn of camshaft, needing two magnets for hall sensor).
    Sound of the engine is different than using single CDI / Coil and distributor, the sound of the engine is a bit louder and closer to a Harley Davidson motorcycle but not bad.
    I also have a modern ( kind off 1994) engine in my car which uses the same principle but with three coils and three sensors it is a Pontiac V6 3.4 liters engine and runs quite nice, but is is a bit louder than usual but sounds way better than the old underpowered 2.1 liter VW engine.
    more details in ignitions:
    One is triggered by contact points and uses a CDI module with two spark plug leads.
    One is Hall effect trigger mechanism with CDI ignition with two spark leads.
    One is contact points with motorcycle coil ( Nology brand ) 45,000 volts this coil has two spark plug leads.
    Best regards.