Date: Sun, 29 Apr 2001 08:09:07 +0100
From: Johannes H Andersen <>
Subject: Re: Engine noise 9.5 engines

Spuds Velvet wrote: > > In article <1kkG6.1111$>, > says... > > Can any one please explain why the 3.0L lpt V6 engine is much noisier than > > the 2.3L 4 cylinder engine? > > > -- > > Saab Fours have a rotating balancer bar that evens out vibration > and incidentally cancels out some vibration noise. The turbo > housing also sits on top of the engine, and it absorbs more > noise. > 1. The turbo sits on the side of the engine, there is no space for it on the top. The turbo does not prevent or reduce mechanical vibrations of the engine, although the turbo might absorb some exhaust noise. 2. My 1993 saab 9K has a 2.0 LPT without balancer shafts. However, the engine runs so smoothly that you can hardly tell it has only 4 cyl. I have driven/owned other 4 cyl cars, but this engine is in a different class of smoothness. It makes me wonder if the introduction of balancer shafts for the 2.0 in 1994 was partly motivated by marketing reasons? The larger 2.3 might benefit more from balancer shafts. > The new Saab six is designed to manufacture inexpensively so it > can be used in economy cars. Saturn uses this engine in the US. > For instance, if you want to save $12,000 dollars on a good > wagon, you can buy the Saturn V6 at $23.5K instead of the Saab at > $36K. They are the same size. > > The engine sends a bit more unharnessed power through the engine > block than it might if Opel had wanted to spend another couple > dozen Marks on its manufacture. The engine, therefore, is not > designed to dampen vibration. The thin wall engine block actually > broadcasts it. The engine itself generates more undampened > vibration (and noise) through its heads, and the turbo housing is > not positioned to dampen any of this noise. > > spuds velvet But why then is a 9-5 3.0 V6 considered "top of the range" and is the most expensive model? Marketing again? Johannes

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