Subject: Intake Air velocity
From: ACRE NL
Date: 1/10/2002, 11:53 AM


>From the Tokoyo motor show press release

          RENESIS, the key to the RX-8's front-midship layout,
          features a side-intake, side-exhaust layout, with the
          exhaust ports moved to the side housing of the rotor
          chamber. This allows the size of the ports to be freely
          set, resulting in an expanded air-intake port area _
          30% larger than in conventional rotary engines _
          greatly improving intake resistance and contributing to
          the high maximum output targets of 184kW
          (250PS)/8,500rpm and maximum torque of 216Nm
          (22.0kg-m)/7,500rpm even with natural aspiration.
          

          In addition, the adoption of dual exhaust ports for each
          chamber achieves twice the port area of conventional
          designs and also allows exhaust port timing to be
          delayed for increased thermal efficiency in the
          expansion process. Unburned hydrocarbons are
          retained for combustion in the next cycle, which
          greatly reduces emissions. A three-stage induction
          system, featuring shutter valves at the intake ports of
          each rotor, utilize the incoming air's dynamic charge
          effect and improve filling efficiency, while twin
          electronic throttles precisely and flexibly control the
          valve operation. Furthermore, a wet-sump lubrication
          system with oil-pan height just half that of
          conventional designs also reduced engine size and
          weight.

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