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The way Saab has the SVC set up is quite similar to how they have the APC set up on older cars - a very high peak boost in the mid-range, tapering out to a substantially lower level at the high-end. This nets big-motor torque (i.e. drivability) with small-motor economy.
The idea behind SVC is *not* power - it's fuel economy. They are attempting to deliver an exciting driving experience while still maintaining excellent fuel economy. In the SVC design, the motor drops to low compression and engages a supercharger to deliver gobs of torque to get you going, but once you've reached cruising speed it loses the supercharger and increases compression to maximize fuel economy. It's a solid design as it neatly skirts a number of engine design issues, including the old argument of forced induction (parasitic loss, low compression) vs. natural aspiration (low torque, good fuel economy).
-Justin
posted by 64.166.4...
Posts in this Thread:
- Variable Compression Ratio Engine ..., J, Sat, 7 Sep 2002 19:32:28
- wouldn't that apply to all turbo-charged engines?, Aero'ed, Sat, 7 Sep 2002 19:56:18
- CR is purely a function of cylinder geometry..., Mr. Science, Sun, 8 Sep 2002 01:27:01
- Actually..., Justin VanAbrahams , Sun, 8 Sep 2002 15:44:20
- Re: CR is purely a function of cylinder geometry..., Aero'ed, Sun, 8 Sep 2002 08:56:13
- Saab is not just experimenting -, saabaru, Tue, 10 Sep 2002 14:16:56
- SVC Link, Mr. Science, Sun, 8 Sep 2002 13:08:47
- Aero'ed, I have a link that will help, ERP, Sun, 8 Sep 2002 10:59:42
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