This is why there's very little time actual "waiting" for the intake valve to open. Effectively almost none at all. 'Closed' is a relative term; it behaves more like a superfast pulse. BTW, the fuel droplet is not starting at rest; it's under both a high pressure and a high rate of flow. So, it has a running start; that way it sprays in a nice conical pattern and atomizes to mix well with the air for optimum combustion and complete burning. Yes, the newer sequential timed injection systems are both more fuel efficient and have lower emissions, and as a bonus, higher power output! Mike B. -----Original Message----- From: Mike S Sent: Wednesday, July 27, 2011 7:03 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: dumb fuel injection question At 05:32 PM 7/27/2011, Rocket J Squirrel wrote... >Three out of four fuel injections get squirted at a closed intake >valve. >What possible difference does the injector pattern make then? And what >does the fuel do when waiting around for the valve to open? Puddle? At 2040 RPM, each intake valve opens 17 times per second. In the 59 ms between valve openings, a droplet starting at rest would only drop 0.7 inches. Of course, there's a lot of turbulence in there, so things get mixed up. There's simply not enough time for the fuel to puddle. It just hangs around as a mist, waiting to get sucked into the cylinder. |
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