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Date: Sat, 06 May 2000 18:35:31 -0700
From: Johannes H Andersen <johannes.andersennopsamel.ac.uk>
Subject: Re: New Saab Engine


Scott Nelsen wrote: > > I have been doing some reading on the new Saab Variable Compression > (SVC) engine and although I am not an engineer and understand only about > 1/2 of what they are talking about - I CAN'T WAIT!!!! > Interesting development indeed. > 1) This engine may do away with the notorious head gasket problems > (although it may raise other issues). > Yes, there is no head gasket, cylinder+head is one piece. But since the cylinder swings out compared to the bottom engine, another sealing problem is introduced. > 2) The thought of getting 225hp out of a 1.6L 5-cylinder NORMALLY > ASPIRATED engine makes me shiver with excitement. (Remember, that's > just short of the horsepower of the Viggen which is a 2.3L turbo-charged > engine...) > Horsepower is not what matters, a wide power band is more important. This should be possible by the compressor, slightly better than a turbo in delivering torque. (Other posters have mentioned the compressor) > 3) They are touting a 30% increase in fuel efficiency because they are > able to now vary the compression to get power when needed and efficiency > when the power is not needed. Hmmmm.... more power AND better gas > mileage? Where do I sign up?!!!! > Variable compression is just what is needed for a positive displacement engine. Compression ratio has always been compromised in turbos. From CR=7.0 in early turbos to about 9.0 with knock sensors. Computer engine management could be taken to a new level for this engine. Computer programmers needed for servicing ? > If they drop this engine into a little 2-seater that is rumored to be in > development, they are going to blow the socks off any of the Z3s, S2000s > or other "boxers" out there. Anybody have any thoughts on when we might > actually see this engine appearing in cars? > Nope dono. Johannes

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