V-4 Twin Compound Engine

grabcad

In a V4-Twin engine, one bank of cylinders (L.P. Cylinders) undergoes a compound operation, utilizing exhaust gas from the other bank's cylinders (H.P. Cylinders). The L.P. cylinders operate without camshafts, valves, or injectors, relying on ports in their cylinder heads for intake and exhaust cycles. A central common manifold is shared between both banks, where combustion gas exits the H.P. cylinders and enters the L.P. cylinders, generating a high-pressure wave that produces useful work and reduces exhaust noise. This innovative design simplifies manifold configuration while eliminating the need for an EGR system, resulting in improved efficiency due to increased Compound Cylinder surface area compared to Combustion Cylinder surface at each cycle. The original V4 Turbo engine was created by Ivo Jardim and published on GrabCAD.