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Will two strokes come back?
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[QUOTE="Rhein, post: 1181125, member: 71022"] I apologize let me rephrase what I said: "After initial engine start the fuel put into the engine is metered so precisely it [B]virtually[/B] all burns. Carbs put excessive amounts to where it all can't completely burn. Also since it is this new fangle technology called fuel injection it injects the fuel when the exhaust port is closed." It is very obvious that the seals between rings and cylinder walls aren't perfect but they are so damn close that even arguing about it is pointless. I didn't say that they were perfect, I said the exhaust port is closed, blocked off, not open anymore, however the hell you want to put it. How much fuel can escape through that seal between a cylinder and piston is a moot point. All of your arguments are opinions with no factual documentation to back it up. Saying BRP are liars does not prove anything. I guess Yamaha, Nissan and Mercury are liars too right? In a DI 2t engine like the [B]Yamaha HPDI[/B] the fuel is metered precisely and is virtually all burnt. It is also injected after the piston closes up the exhaust port which is key. Watch this animation on Yami's website: [url]http://www.yamaha-motor.com/outboard/05pi/z300/05pi.aspx[/url] -Highlight and click "High Pressure Direct Injection" That is a great animation illustrating that the fuel enters when the exhaust port is closed. The insane amounts of fuel/air that would escape on a carbed 2t that created hippy emissions hysteria are not a problem anymore with this engine design. The BRP E-Tec engine also has pistons that further aid the burning of the fuel. Some DI 2ts even have the injector and spark plug placed so that the fuel hits the plug. The amounts of fuel that aren't burnt are so minuscule that they aren't a serious damper on emissions. The flaw and superiority of a 2t engine is that it has no valves like a 4t to keep in the fuel air mix to be burnt. The DI concept bridges that gap. The metering of fuel into the engine only when the exhaust port is blocked off/closed/not open anymore allows the 2t to be dramatically better with emissions vs a sloppy carb where it just prematurely ejaculates into the expansion chamber. The DI 2ts shouldn't even need an expansion chamber anymore either as they were used to help put the escaping fuel/air charge back in the engine. LASTLY please, tell Doc that he and his employers are liars: [url]http://www.dirtrider.net/forums3/showthread.php?t=86046[/url] [/QUOTE]
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Will two strokes come back?
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