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Date: 27 Sep 2004 21:09:08 GMT
From: Dave Hinz <DaveHinznospamcop.net>
Subject: Re: information on Saab 1995-96


On Mon, 27 Sep 2004 17:02:21 -0400, ma_twain <ma_twainnospamo.com> wrote: > Good question, "what is the DI cassette?" > > Long time ago, when real Saabs were designed and made in Sweden, the > ignition system was more conventional and reliable. Then someone came up > with the idea of a "better" ignition system, let's called it Direct > Ignition (DI). Let's put all of the key ignition components in one unit > and place it as close to the spark plugs as possible to improve > performance. It did that, but longevity was a problem - the units > burned out, either from heat or electrical issues. But since you could > not only sell a car for $45,000, you could also get $400 for a DI > cassette every 30,000 miles - great for the bottom line of the GM! Now wait just a second. Greed and GM have nothing to do with the design decision to go with DI. The performance, fuel economy, and emissions improvements made possible by going to DI are the reason that so many cars are now using it. The longevity problems are from Bosch (since fixed, I'm led to believe), not from GM... The engine management system on the current Saab gasoline engines uses the spark plug as a sensor, detecting the conductance of the fuel:air mixture in the cylinder as it's being compressed by the piston, and deciding based on that and a half-dozen other factors when to fire the spark. You just plain can't do that sort of thing without having some intelligence in the ignition system. This is also why spark plugs are a critical "use this part, not the Bosch equivalent that the book at K-mart says you can use" type replacement part.

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