This invention relates to a cooling system for an engine and more particularly to an improved cooling system of the type wherein the cylinders of the engine are parallel with the associated heat exchanger for the engine.
In many types of motor vehicles, the engine is placed transversely in the engine compartment and closely adjacent the axles which it drives. Normally this means that the cylinders are parallel with the associated heat exchanger which may be positioned either ahead of or to the rear of the engine within the engine compartment. Conventionally engines are provided with a cooling system wherein water is introduced to the engine at one end of the engine and discharged from the opposite end of the engine. This tends to give rise to uneven temperatures in the engine from one end to the other. That is, the cylinders disposed closer to the water inlet will operate at a lower temperature than those disposed remotely from the water inlet and adjacent the water outlet. Also, in conjunction with transverse placement of the engine, there are certain difficulties in connection with transferring the coolant between the engine and the heat exchanger.
It is, therefore, a principal object of this invention to provide an improved cooling system for an engine wherein the temperature of the cylinders will be more uniform.
It is a further object of this invention to provide an improved cooling system arrangement for an engine which is disposed so that it extends parallel to the associated heat exchanger.
It is a further object of this invention to provide an improved cooling system for an engine wherein the engine has its water delivery and water exit ports between the ends of the engine.
In many forms of engine cooling systems, the coolant is delivered to the engine first to the cylinder block and then to the cylinder head. Of course, the cylinder head is the more highly heated area. This type of arrangement may not provide adequate cooling for the cylinder head. Also, it is the normal practice to mount: the water pump relatively low in the cylinder block and this further makes it difficult to introduce coolant first to the cylinder head rather than to the cylinder block.
It is, therefore, a still further object of this invention to provide an improved cooling system for an engine wherein the water pump can be positioned more closely to the cylinder head so as to facilitate delivery of the cooling water to the cylinder head before the cylinder block.