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In autumn 1981 both V8-engines were thoroughly modernised as part of the "Mercedes-Benz Energy Concept" for reducing consumption and emissions. This involved not only higher compression, but also camshafts with altered timing, improved injection valves and electronically controlled idling. The altered valve timing meant that maximum torque could be achieved at lower revolutions and was even increased for the 3.8-liter engine. This engine was changed the most. In order to achieve a more favourable volume to surface ratio the bore was reduced and the stroke increased. The modified 3.8-liter V8 thus arrived at a slightly higher capacity. In return for improved economy, slight drops in output had to be accepted; rear axle ratios were altered accordingly.
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source: Next Classics
Негізгі бет r107 Mercedes-Benz 380 SL in color DB 473U Champagne Metallic, 1983
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