V-4 Twin Compound Engine

grabcad

In a V4-Twin engine (defined as an engine with the cyclinders at each cylinder bank running in parallel), one of the cylinders banks (the L.P. Cylinders) is used for a Compound Operation, receiving the Combustion Gas from the other bank cylinders (H.P. Cylinders) during its exhaust cycles. The L.P. cylinders would not require any camshafts , valves, injectors, etc.,operating both its intake and exhaust cycles by ports at its cylinder heads. Between both cylinder banks, there is a Central Common Manifold, where at each revolution of the engine Combustion Gas exits from one the HP cylinders and enters both L.P. Cylinders. The high pressure wave generated when the H.P. Cylinder Exhaust Valve opens enters the L.P. Cylinder when it is at 90º crankshaft, producing useful work and dampening the exhaust noise. This is a new variation within the concept of V-Compound Engines, together with the V-Twin Compound Engine: Cycle of Operation and V-Compound Engine concepts already published at GrabCAD. It simplifies the manifold design, as there is no requirement of a EGR system, and allows an increase of the efficiency, as Compound Cylinder surface is now twice the Combustion cylinder surface at each cycle. Original engine was a V4 Turbo by Ivo Jardim https://grabcad.com/ivo.jardim-1/about