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"OHC" redirects here. For other uses, see OHC (disambiguation).
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A sectioned part of a cylinder head cut along the plane of the valvetrain shows two overhead camshafts - one above each of the two hollow-section valves.

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.

Overview

Compared to OHV pushrod systems with the same number of valves, the reciprocating components of the OHC system are fewer and have a lower overall mass. Though the system that drives the camshafts may be more complex, most engine manufacturers accept that added complexity as a trade-off for better engine performance and greater design flexibility. The fundamental reason for the OHC valvetrain is that it offers an increase in the engines' ability to exchange induction and exhaust gases. (This exchange is sometimes known as 'engine breathing'. ) Another performance advantage is gained as a result of the better optimised port configurations made possible with overhead camshaft designs. With no intrusive pushrods, the overhead camshaft cylinder head design can use straighter ports of more advantageous cross-section and length. The OHC design allows for higher engine speeds, which in turn will increase power output for a given torque.

The OHC valvetrain system may be driven by the crankshaft using the same methods as an OHV system, but in practice (and depending on the application), lighter weight and maintenance-free methods are more commonly used. These methods include using a rubber/kevlar toothed timing belt, duplex or single row roller chains, or in less common cases, gears. Early Ducati motorcycle engines used shafts with bevel gears to drive the camshafts in their OHC engines.

In conjunction with multiple valves (three, four or five) per cylinder, many OHC engines today employ variable valve timing to improve efficiency and power. OHC also inherently allows for greater engine speeds over comparable cam-in-block designs, as a result of having lower valvetrain mass.

Fundamental types of OHC

There are two fundamental types of overhead camshaft layout: (SOHC), and (DOHC).

Single overhead camshaft

Overhead cam
A single overhead camshaft cylinder head from a 1987 Honda CRX Si.

Single overhead camshaft (SOHC) is a design in which one camshaft is placed within the cylinder head. In an inline engine, this means there is one camshaft in the head, whilst in an engine with more than one cylinder head, such as a V engine or a horizontally-opposed engine (boxer; flat engine) - there are two camshafts: one per cylinder bank.

In the SOHC design, the camshaft operates the valves directly, traditionally via a bucket tappet; or via an intermediary rocker arm. SOHC cylinder heads are generally less expensive to manufacture than DOHC cylinder heads. Timing belt replacement can be easier since there are fewer camshaft drive sprockets that need to be aligned during the replacement procedure.

Overhead cam
A World War I-era Hispano-Suiza V8 aviation engine, which used single overhead camshafts for each cylinder bank.

In the early era of the liquid-cooled aircraft engine field, single overhead camshaft format engines were in existence during the First World War, for both the Allies and the Central Powers. The Hispano-Suiza 8 - a V8 engine, designed by Marc Birkigt in the Allied camp, and the series of Mercedes inline-six aviation engines, culminating in the Mercedes D.III for the German Empire, both used rotary shaft-driven single overhead camshaft valvetrain systems, and were among the most prominent aviation powerplants of the First World War era. The late-war Liberty L-12 - a V12 engine configuration American aviation engine also used the general Mercedes D-series single overhead camshaft design, based primarily on the later D.IIIa's drive system from rocker box to valvestem.

SOHC designs offer reduced complexity compared to overhead valve designs - when used for multivalve cylinder heads, in which each cylinder has more than two valves. An example of an SOHC design using shim and bucket valve adjustment was the engine installed in the Hillman Imp (four cylinder, eight valve); a small, early 1960s two-door saloon car (sedan) with a rear mounted aluminium-alloy engine based on the Coventry Climax FWMA race engines. Exhaust and inlet manifolds were both on the same side of the engine block (thus not a crossflow cylinder head design). This did, however, offer excellent access to the spark plugs.

In the early 1980s, Toyota and Volkswagen Group also used a directly actuated, SOHC parallel valve configuration with two valves for each cylinder. The Toyota system used hydraulic tappets, while the Volkswagen system used bucket tappets with shims for valve clearance adjustment. Of all valvetrain systems, this is the least complex configuration possible.


Double overhead camshaft

Overhead cam
Overhead view of Suzuki GS550 cylinder head showing double camshafts and chain-drive sprockets.

A double overhead camshaft (DOHC) valvetrain layout (also known as 'dual overhead camshaft') is characterised by two camshafts located within the cylinder head, one operating the intake valves and one operating the exhaust valves. This design reduces valvetrain inertia more than a SOHC engine, since the rocker arms are reduced in size or eliminated. A DOHC design permits a wider angle between intake and exhaust valves than SOHC engines. This can allow for a less restricted airflow at higher engine speeds. DOHC with a multivalve design also allows for the optimum placement of the spark plug, which in turn, improves combustion efficiency. Engines which have more than one bank of cylinders (i.e. V6, V8 - where two cylinder banks meet to form a 'V') with two camshafts in total remain SOHC; unless each cylinder bank has two camshafts - these latter are DOHC, and are often known as 'quad cam'. The term 'twin cam' is imprecise, but will normally refer to a DOHC engine. Some manufacturers use a SOHC in a multivalve design. Also, not all DOHC engines are multivalve engines. DOHC cylinder heads existed before multivalve cylinder heads appeared in the 1980s. Today, however, DOHC is sometimes confused with multivalve heads, since almost all modern DOHC engines have between three and five valves per cylinder - but 'multivalve' and 'DOHC' are separate distinctions.

History

Overhead cam
DOHC straight-8 in a 1933 Bugatti Type 59 Grand Prix racer

The first car to utilize an engine with an overhead camshaft was the Marr Auto Car designed by Michigan native Walter Lorenzo Marr in 1903. The first DOHC car was the 1912 Peugeot which won the French Grand Prix at Dieppe that year. This car was powered by a straight-4 engine designed by Ernest Henry under the guidance of the technically knowledgeable racing drivers Paul Zuccarelli and Georges Boillot. Boillot, who drove the winning car that year, won the French Grand Prix for Peugeot again in 1913 but was beaten in 1914 by the SOHC Mercedes of Christian Lautenschlager.

Among the early pioneers of DOHC were Isotta Fraschini's Giustino Cattaneo, Austro-Daimler's Ferdinand Porsche, Stephen Tomczak (in the Prinz Heinrich) (in 1919); Sunbeam built small numbers of racing models between 1921 and 1923 and introduced one of the world's first production twin cams in 1924 - the Sunbeam 3 litre Super Sports, an example of which came second at Le Mans in 1925. The first DOHC engines were either two- or four-valve per cylinder racing car designs from companies like Fiat (1912), Peugeot Grand Prix (1912, four-valve), Alfa Romeo Grand Prix (1914, four-valve) and 6C (1928), Maserati Tipo 26 (1926), Bugatti Type 51 (1931). and three years later, Harry A. Miller and Fred Offenhauser inaugurated the line of 4.1 litre DOHC Offenhauser inline-4 American auto racing engines, which began to dominate American open-wheel auto racing through much of the 20th century.

American luxury automaker Duesenberg was an early proponent of overhead camshaft engines with their SOHC straight eight Model A, produced from 1921-1927. This engine had four valves per cylinder. Duesenberg also produced successful OHC race car engines in the 1920s. The Duesenberg Model J, 1928-1937, featured a massive DOHC straight eight engine producing 265 horsepower.

Overhead cam
1948 Crosley COBRA engine with single overhead camshaft and two valves per cylinder. The tower gear driving the camshaft is in the foreground.

Low-priced American manufacturer Crosley used a small, 44ci 4-cylinder SOHC engine following World War II. This unusual engine was developed during the war by Lloyd Taylor, licensed by Crosley, and used to power generators and other military applications. The overhead camshaft was driven by a tower shaft and gears. The original design was made of steel stampings, copper-brazed together to form a strong and light block assembly. It was known as the COBRA engine ("COpper BRAzed") and generated 26.5hp in automotive form. (Jim Bollman. "Crosley Engine Family Tree - CoBra Years". )

Electrolysis and corrosion problems due to the bi-metallic construction of the Crosley engine and the salt-based antifreeze then in common use led to a more traditional cast iron block assembly (CIBA) version of the same engine in 1949. (Jim Bollman. "Crosley Engine Family Tree - CIBA Years". ) Used in Crosley's Hot Shot sports car, this small OHC engine won the first 12 Hours of Sebring race in 1950. ("12 Hours of Sebring - Winners". ) The Crosley OHC was popular in H-modified racing for its high-RPM performance. After Crosley ceased automotive production, the engine was produced by several other companies for many years, finishing its life as the Bearcat 55 outboard motor manufactured by Fisher Pierce, builders of the Boston Whaler boats. (Jim Bollman. "Crosley Engine Family Tree - Big Block Years". )

When DOHC technology was introduced in mainstream vehicles, it was common for it to be heavily advertised. While used at first in limited production and sports cars such as the 1925 Sunbeam 3 litre, Alfa Romeo is one of the twin cam's greatest proponents. 6C Sport, the first Alfa Romeo road car using a DOHC engine, was introduced in 1928. Ever since this, DOHC has been a trademark of most Alfa Romeo engines (some Alfa V6 engines are SOHC, not DOHC. Most Alfasud boxer engines were also SOHC).

Fiat was one of the first car companies to use belt-driven DOHC engines in some of their products in the mid-1960s.[citation needed], Jaguar's XK6 DOHC engine was displayed in the Jaguar XK120 at the London Motor Show in 1948, and used across the entire Jaguar range through the late 1940s, 1950 and 1960s. By the late 1970s, Toyota was the best seller of DOHC engines.[citation needed]

More than two overhead camshafts are not known to have been tried in a production engine. However, MotoCzysz has designed a motorcycle engine with a triple overhead camshaft configuration, with the intake ports descending through the cylinder head to two central intake ports between two outside exhaust camshafts actuating one of two exhaust valves per cylinder each.

Overhead cam
Cutaway view of a Napier Lion showing the double overhead camshaft arrangement

In inline piston aero engines, DOHCs have been used for many engines. The 1917 Napier Lion, for example, had them.

See also

References

  1. Hillier, V.A.W. (2012) [First published 1966]. "2". Fundamentals of Motor Vehicle Technology (Academic text-book). Book 1. In association with: The Institute of the Motor Industry (IMI) (6th ed.). Nelson Thornes Ltd. ISBN  - get this book. 
  2. Stoakes, Graham; Sykes, Eric; Whittaker, Catherine (2011). "3". Principles of Light Vehicle maintenance & repair. Heinmann Work-Based Learning. Babcock International Group and Graham Stoakes. pp. 208–209. ISBN  - get this book. 
  3. Tan, Paul (22 June 2005). "SOHC vs DOHC Valvetrains: A Comparison". PaulTan.org. Driven Communications Sdn Bhd 2012. 
  4. "Dan's motorcycle 'Cam Drives'". dansmc.com 2012. 
  5. ETKA
  6. Marr Auto Car Company
  7. Kimes, Beverly Rae (2007). Walter L Marr: Buick's Amazing Engineer. Racemaker Press. p. 40. ISBN  - get this book. 
  8. Georgano, G.N. Cars: Early and Vintage, 1886-1930. (London: Grange-Universal, 1985).
  9. Kevin Clemens (February 2009). "An Echo of the Past - the history and evolution of twin-cam engines". EuropeanCarWeb.com. European Car Magazine, Source Interlink Media 2012. 
  10. "Introducing MotoCzysz Z-Line 4 Engine". MotoCzysz. MotoCzysz.com. 2006-08-25 2012. 
Source of information: Wikipedia, the free encyclopedia - Disclaimer.

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