The BMW M328 is an overhead valve straight-six petrol internal combustion engine which was produced from 1936 to 1940. It was a high-performance development of the BMW M78 engine that was produced alongside the M78.
7-622: Compared with the M78, the M328 has an aluminium cross-flow cylinder head with hemispherical combustion chambers . The M328 was used in the BMW 328 and BMW 327/28 coupes. After World War II the engine was also licensed to Bristol Cars in the United Kingdom. The M328 had an unusual valvetrain design; although the camshaft is located in the engine block, the exhaust valves are actuated by
14-528: A transverse pushrod from the intake valves. This results in a valve layout similar to a DOHC engine. With a bore of 66 mm (2.60 in) and a stroke of 96 mm (3.78 in), the displacement was 1,971 cc (120.3 cu in), the same as its M78 predecessor. Fuel supply was via three Solex "30 JF downdraft" carburetors. The M328 engine has a compression ratio of 7.5:1 and produces 59 kW (79 bhp) at 5000 rpm. Applications: Crossflow cylinder head A crossflow cylinder head
21-412: Is a cylinder head that features the intake and exhaust ports on opposite sides. The gases can be thought to flow across the head. This is in contrast to reverse-flow cylinder head designs that have the ports on the same side. Crossflow heads use overhead valves, but these can be actuated either by overhead camshafts , or by a valve-train, which has the camshafts in the cylinder block, and actuates
28-399: Is overlap between the intake and exhaust profiles there is a point in which both valves are open. At that point the inertia of the exhaust gases leaving the cylinder helps to aspirate the intake gases into the cylinder. The other main reason for the better performance of crossflow is that the ports and valves can be larger and its physical separation of the hot exhaust manifold keeps the air in
35-612: The addition of fuel injection and a modern engine management system . The term was also briefly used in the early 1980s in Australia for the revised 4.1 litre inline six-cylinder engine in Ford's Australian large family car, the Falcon . This was in response to the post-1979 fuel crisis where the Falcon was a comparatively fuel-inefficient car compared to its contemporary rivals. This term
42-467: The intake manifold cooler. Most modern engines are of a crossflow design. The engineering terminology for these benefits is greater volumetric efficiency . In the UK, "Crossflow" is also used to refer specifically to Ford Motor Company 's Kent Crossflow four-cylinder overhead valve engine, and its short-block "Valencia" derivative which has been used in cars from the 1960s up to the present day, albeit with
49-443: The valves with push rods and rockers. A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing. But since there
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