exhaust manifold

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Fully equal length layout to increase exhaust flow velocity and improve torque.

Let's take a look at the work an engine does.Basically, it involves the process of converting the chemical energy contained in gasoline into thermal energy, and the process of extracting that energy mechanically. In terms of power performance, it goes without saying that the front-end process is important. And what controls this is a series of air flows. That's why the design of air inlets and outlets requires fluid mechanics. So, to get to the point, in that sense, the exit is actually more difficult to design. The pressure and temperature are high, and of course the flow rate is also fast. That's why there is so much resistance. On top of that, there is also the difficulty of pulsation due to the timing of the explosion. These problems are particularly concentrated on the exhaust manifold, which is located directly behind the engine. Therefore, the question is how to effectively tune it.
Our basic design is a 4-2-1 (3-1 for RX-8) layout that aims to increase torque from low to medium speeds. Taking into consideration the rotational speed and overlapping characteristics of each individual engine, the distance to the assembly part was made longer than in mass production, and the length was made equal. Furthermore, the angle of the merging section has been narrowed to prevent the blowdown phenomenon (exhaust backflow) that occurs at high speeds. In addition, the connecting part to the first engine has a radial shape, increasing the exhaust flow velocity and achieving output characteristics that enhance the engine's capabilities. The functional beauty of stainless steel is also attractive, as it is made using craftsmanship such as fully machined flanges and back shield manufacturing using TIG welding.