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<x-charset iso-8859-1>Hmmm.. every time I do plugs they are all a brownish grey... not white and clean. My plugs get changed at about 15Kmi and most of my driving is highway. Im perhaps a wee bit rich but certainly not much as the gas mileage can attest. Keith Keith Park Top Notch Restorations topnotch@nycap.rr.com 71 Squareback 65 Notchback 65 Squareback 75 Opel 87 Golf 88 Rx7 10th Anniversary ----- Original Message ----- From: "Jim Adney" <jadney@vwtype3.org> To: <type3@vwtype3.org> Sent: Wednesday, April 24, 2002 9:19 PM Subject: [T3] Gasohol > I got the scoop on alcohol in gasoline this afternoon. > > When you run gasoline the ideal air/fuel ratio is 14.7:1, but with alcohol that > ratio is about 7:1. This means that if you switch to alcohol you have to open > up your main jets about a factor of 2 to get your engine to run right on > alcohol. If you don't, the engine will be running lean. > > Of course a 10% mix of alcohol would only take you ~10% of the way to a > factor of 2, or a factor of about 1.1. In most cases, this would not make > much of a difference, but if your carbs were running rich already (running with > gasoline) then the switch to alcohol would make an improvement, but not as > big an improvement as getting them set up properly for gasoline would make. > > If your engine is currently running too lean on gasoline, converting to gasohol > will make it run even leaner. > > Another thing I learned today is that all the charts we see, which claim to > show us how to set our mixture using the appearance of the plugs, are no > longer valid. Modern gasoline with its low lead content will not make plugs > darken like the gasoline of 30 years ago. A correctly set up system will leave > the plugs running very close to white, and you won't be able to tell the > difference between the correct mix and a lean mix. They will both be nearly > pure white. If you set up your engine to darken the plug insulator a bit with > today's fuel it will be much too rich and your performance will suffer. > > - > ******************************* > Jim Adney, jadney@vwtype3.org > Madison, Wisconsin, USA > ******************************* > > ------------------------------------------------------------------- > Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe > > </x-charset>