is widely recognized as the first postwar modern overhead valve ( OHV ) engine to become available to the public.

Oldsmobile once again was a pioneer when, for the 1949 model, they introduced their Rocket engine, which used an overhead valve V8 design rather than the flathead " straight-8 " design which prevailed at the time.

Peugeot introduced a five valve per cylinder, triple overhead cam engine for the Grand Prix, conceived by Marcel Gremillon ( who had criticised the early DOHC ); but the engine was a failure.

A new 173-horsepower ( 129 kW ) overhead valve V-8 engine was introduced.

Pontiac also introduced its 151 cubic inch " Iron Duke " 4-cylinder overhead valve engine.

A uniflow diesel engine takes in air via scavenge ports, and exhaust gases exit through an overhead poppet valve.

More modern designs have the camshaft on top of the cylinder head, pushing directly on the valve stem ( again through cam followers, also known as tappets ), a system known as overhead camshaft ; if there is just one camshaft, this is a single overhead cam or SOHC engine.

With peace, production resumed in 1946 with the pre-war Cinq ( 5CV ) and Huit ( 8CV ), but a new car arrived in 1948 with the Simca 6 with overhead valve 570 cc engine ahead of the equivalent Fiat.

The overhead cam design typically allows higher engine speeds because it provides the most direct path between cam and valve.

New four-cylinder overhead valve 14 / 40 and 16 / 60 models appeared in 1926, and the prewar and six-cylinder models continued to be produced until 1927.

Most of these quirky and distinctly British small cars used Europe's first mass-produced lightweight overhead valve aluminium alloy engine, initially 598 cc, but enlarged through the years to a final 848 cc in 1975.

If the camshaft is located in the crankcase, a valve train of pushrods and rocker arms will be required to operate overhead valves.

The Buick straight-8 engine was an overhead valve design, while the Oldsmobile and Pontiac straight-8s were flathead engines.

Oldsmobile replaced their straight-8 with a V8 engine in 1949, at which time Cadillac also introduced their first overhead valve V8.

Packard ended production of their signature straight-8 at the end of 1954, replacing it with an overhead valve V8.

By the end of the 1970s overhead valve V8s powered 80 % of automobiles built in the US, and most of the rest had six-cylinder engines.

Pressure oiling is commonly used in large and complex internal combustion engines in parts of the engine where directly splashed oil cannot reach, such as up into overhead valve assemblies.

It featured America's first high-compression overhead valve V8 in the smaller, lighter Oldsmobile 76 / Chevy body for six-cylinder engines ( as opposed to bigger Olds 98 luxury body ).

The initial Firenza was available in a base model 1159 cc overhead valve and two models with overhead camshaft, in 1598 cc and 1975 cc variants.

It had a overhead valve engine.

This design, however, requires the incoming air to flow through a convoluted path, which limits the ability of the engine to perform at higher revolutions per minute ( rpm ), leading to the adoption of the overhead valve ( OHV ) head design, and the subsequent overhead camshaft ( OHC ) design.

In the overhead valve ( OHV ) design, the cylinder head contains the poppet valves and the spark plugs, along with tracts or ' ports ' for the inlet and exhaust gases.

While today some cheaper engines rely on a single camshaft per cylinder bank, which is known as a single overhead camshaft ( SOHC ), most modern engine designs ( the overhead-valve or OHV engine being largely obsolete on passenger vehicles ), are driven by a two camshafts per cylinder bank arrangement ( one camshaft for the intake valves and another for the exhaust valves ); such camshaft arrangement is known as a double or dual overhead cam ( DOHC ), thus, a V engine, which has two separate cylinder banks, may have four camshafts ( colloquially known as a quad-cam engine ).

The overhead camshaft design adds more valvetrain components that ultimately incur in more complexity and higher manufacturing costs, but this is easily offset by many advantages over the older OHV design: multi-valve design, higher RPM limit and design freedom to better place valves, ignition ( Spark-ignition engine ) and intake / exhaust ports.

Although the Chevette was largely a rebadged Opel Kadett C with revised front-end ( detailed below ), it did use the 1256 cc overhead valve ( OHV ) engine of the Viva instead of the Kadett's units, which were produced by Opel.

* Increasing the valve opening height ( lift ), by changing the profiles of the cams on the camshaft, or the lift ( lever ) ratio of the valve rockers ( overhead valve, or OHV, engines ), or cam followers ( overhead cam, or OHC, engines ).

* The Series 452 from 1930 until 1937, a narrow 45 ° V angle OHV ( overhead valve ) engine.

The 1. 2 L had an overhead valve ( OHV ) head, while the 1. 6 L and 1. 9 L featured a camshaft-in-head ( CIH ) type of engine.

Overhead camshaft, commonly abbreviated to OHC, is a valvetrain configuration which places the camshaft of an internal combustion engine of the reciprocating type within the cylinder heads (' above ' the pistons and combustion chambers ) and drives the valves or lifters in a more direct manner compared to overhead valves ( OHV ) and pushrods.

The Canadian Essex is an overhead valve ( OHV, or pushrod ) design featuring aluminum heads, which reduced its weight considerably and made it a very powerful engine for its size.

The original overhead valve or OHV piston engine was developed by the Scottish-American David Dunbar Buick.

* Smaller overall packaging: because of the camshaft's location inside the engine block, OHV engines are more compact than an overhead cam engine of comparable displacement.

Some specific problems that remain with overhead valve ( OHV ) engines:

Although most multi-valve engines have overhead camshafts, either SOHC or DOHC, a multivalve engine may be a pushrod overhead valve engine ( OHV ) design.

It started as a pushrod overhead valve ( OHV ) design and later performance oriented twin cam ( DOHC ) variants were added to the lineup.

The heads were modeled after the standard Chevrolet overhead valve design, with large valves operated by rocker arms, actuated by pushrods run off a 9 lobe camshaft ( due to the unique engine layout, exhaust lobes operated valves on * both * sides of the engine ), running directly in the crankcase bore without an inserted bearing, operating hydraulic valve lifters, as used on most Chevrolet OHV engines.

However, unlike most other car makers at the time, Buick had been using a valve-in-head OHV overhead valve design or I-head since its inception and continued this practice in their inline-8 designs.

It was produced from 1958 through 1965 in both overhead valve ( OHV ) and flathead ( L-head ) side-valve versions.

Since overhead cam engines are design variants of OHV engines, it is fair to classify virtually all modern engines as derivatives of Buick's invention.

In parallel to the development of the bus was the invention of the electric trolleybus, typically fed through trolley poles by overhead wires, which actually preceded, and in many urban areas outnumbered, the conventional engine powered bus.

First diesel engine with an overhead cam shaft of Daimler Benz.

This new engine had a modern overhead camshaft design but was never used in Fiat cars.

The engine is an inline four with two valves per cylinder and a single overhead camshaft.

The Samara engine was mostly designed and produced in-house, had a new single overhead cam design and was driven by a more modern rubber belt.

In 1914, an advanced Grand Prix car was designed and built, the GP1914, which featured a four-cylinder engine, double overhead camshafts, four valves per cylinder and twin ignition.

In basic form, the Niva has a carbureted 1. 6-litre overhead cam four-cylinder petrol engine producing 54 kW ( 72 hp ) and 126 N · m ( 93 lb · ft ), a four-or five-speed manual transmission, and full-time four-wheel drive.

Although the layout remained the same, the body was all new, as was the engine, being equipped with four overhead camshafts, a higher capacity ( 3495 cc ) and an output close to.

On the technology front, 1966 saw the introduction of a completely new overhead camshaft 6-cylinder engine in the Tempest, and in an industry first, plastic grilles were used on several models.

It was the final year for the overhead cam six-cylinder engine in Firebirds and intermediates, and the Firebird convertible ( until 1991 ).

* small, lightweight, 9HP air-cooled flat twin engine, ( with overhead valves when side valves were still common ), mounted very low in front of the front wheels for stability

It was an air-cooled, flat-twin, four-stroke, 375 cc engine with pushrod operated overhead valves and a hemispherical combustion chamber.

Most MUs are powered either by traction motors, receiving their power through a live rail or overhead wire ( EMU ), or by a diesel engine driving the wheels through a gearbox or hydraulic transmission ( DMU ).