Date: Thu, 30 Sep 2004 12:58:53 +0200 From: "Kristian Steve Jensen" <dat0hksjnospam.hitos.no> Subject: Re: Re: Town And Country Miles
"Malcolm William Mason" <mwm1(delete)nospamedu> skrev i melding news:3c9nl0128ajrt813tmpl85o33p553n7v60nospamcom... > On Tue, 28 Sep 2004 11:30:11 +0200, "Kristian Steve Jensen" > >>My guess is that on the highway, the Aero has a much more fuel efficient >>engine and its sleeker, more aerodynamic body comes into play. In low city >>speeds, the added weight over the 9000 and the aggressive cams and timing >>on >>the engine compared to the 9000 contributes to the overall mileage. >> >>Kristian >> > I appreciate the information. Thank you very much. How much more mass > am I accelerating in the 9.5 compared with the 9k? My 9000i has a kerb weight of 1300 kg according to my registration (but ended at 1440 with 20 liters of fuel and me in it). Note that I do not have turbo, leather seats or air condition. A 9-5 Aero weighs in at 1540 kg according to Yahoo! Autos. If we add equipment, fuel and driver, you probably come close to 1750 kg. The difference is significant. Imagine loading your 9000 with 300 kgs of concrete and driving that around town! > > I do not understand exactly what is meant by "aggressive" cams and > timing. Would you please enlarge on the message? > Cams are the devices which open and close the valves that lets in air/fuelmixture to the engine and lets out the exhaust. To produce the massive power of the 9-5 Aero, the valves have to stay open very long to let in lots of fuel. This is perfect for mid- to high-speed use as power is always readily available, and the fuel is used at maximum efficiency. In city driving, this much power isn't needed, so as you lug around town at low revs the valves let in more fuel than needed. Also, the Aero has a big turbo which is wonderful when you're in boost range with your revs, but in the city extra fuel is used to spin the turbine around with little to no effect. Hopes this makes things a little clearer. Kristian
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