A lame substitute - Saab General Bulletin Board - Saabnet.com
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A lame substitute
Posted by Stephen Goldberger (more from Stephen Goldberger) on Fri, 1 Nov 2002 15:35:57
In Reply to: Follow this link..., Leon, Fri, 1 Nov 2002 14:31:29
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In the words of Dr. Uwe-Dieter Grebe, the engineer responsible for gasoline engine development at Opel Powertrain GmbH: "Our experimental work has clearly proven that variable intake control in conjunction with high exhaust gas recirculation rates achieves approximately the same reduction in fuel consumption on small-displacement engines as the far more complex direct gasoline injection principle". Grebe's conclusions: "For the smaller engines that are used in compact and lower midsize cars in particular, "Twinport" is an intelligent and simple means of improving the engine's operating characteristics."
By comparison, Saab's direct gasoline injection also uses large amounts of EGR, but unlike other DI gasoline concepts, it also maintains a stochiometric mixture to allow conventional catalysts to work correctly. I'm guessing that "twinport" is limited to small engines because they're always running at full throttle anyways.
Rumors are that Saab's direct injection will appear on the V-6 powered production version of the 9-3X.
posted by 24.166.8...
http://www.saabclub.com
Posts in this Thread:
- Next gen Astra to sport SAAB engines (+), Vlad, Thu, 31 Oct 2002 16:33:33
- heard about samething on the small corsa, dafas, Sat, 2 Nov 2002 16:36:47
- Aero engine ?, Leon, Fri, 1 Nov 2002 14:33:40
- If SAAB Does an SUV,, Ian Glenday , Thu, 31 Oct 2002 20:24:21
- Twinport valve design: what is it? (-), Jon906, Thu, 31 Oct 2002 18:07:32
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