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Renault Cléon-Fonte engine : ウィキペディア英語版
Renault Cléon-Fonte engine

The Cléon-Fonte engine, also known as the Sierra engine or under the code "C-engine" or "C-Type", is a family of four-cylinder, in line automobile engines manufactured continuously by Renault and its subsidiary Dacia from 1962 to 2004. For more than four decades it was a mainstay in Renault's compact models, before being gradually replaced by the E-type engine from the late 1980s onward.
The C-type is an overhead valve, water-cooled design, with a 5-bearing crankshaft, a chain driven, side-positioned camshaft operating the valves via pushrods and rockers, and an aluminum cylinder head.
==History〔(Moteur Cléon-Fonte: son histoire ) sur ''http://www.r9-r11.com/''〕 ==
When production started in 1962, this (then) modern engine was initially called the "Sierra"; it was soon renamed the "Cléon-Fonte", taking its name from the ultra-modern Renault factory where it was first manufactured. This four-cylinder provided power for generations of Renaults over the years, with displacements from 956 cc to 1565 cc. Cars fitted with the engine range from the Floride/Caravelle through the first generation Twingo of 1993, thirty years after this power unit was presented to the press at Geneva.
Technical adaptations enabled the production of this engine in many displacements in single and dual carburettor forms, later with fuel injection, with or without turbo. The Cléon-Fonte was coupled initially to four-speed manual transmissions, and then later five speed and automatic gearboxes according to its applications and the natural progress of the automotive industry.
It was fitted in one form or another to an impressive list of Renault models, in rear-, mid- or front engined (longitudinal or transverse) configurations, including: Floride/Caravelle, Alpine A110, R4, R5 (Le Car in the USA), R6, R7 (Siete), R8/R10, R9/R11 (Alliance/Encore in USA), R12, R15, R18, R19, R21 (Export), Estafette, Traffic 1, Express (Rapid / Extra), Fuego, Twingo, Clio 1, not to mention the Renault R12 based Dacia 1300/1310 range produced from 1969 to 2004. On Monday, 29 November 2004, Dacia produced the last C-engine, which was a 1.6 litre, fuel injected model, producing 68 horsepower and with the serial number 2527155. The C-engine stopped production four months after that of the Dacia 1310. Dacia continues to manufacture components of the Cléon-Fonte engine for the purposes of service in Romania and abroad. In total, more than 27 million units of the Cléon-Fonte were produced by Renault and Dacia since its launch, 15 million of which were built in France. This engine was also assembled in Portugal, Spain, Turkey, Colombia and Argentina.
In France, the Cléon-Fonte ended its career in December 1996 in the Twingo and Clio which used the 1239cc C3G , and the Supercinq "Bye Bye", fitted with the 1390cc C3J; this also marked the end of Renault 5 production. This engine can be found at the heart of thousands of classic Renaults, lovingly preserved. In total, this engine had an unusually long career: nearly half a century.
Not less than 27,277,306 engines were manufactured in 42 years, a record in Europe (some American V8 have far exceeded this number). Behind this record, the strength and versatility of the Renault engine has enabled it to power many very different cars, mounted in every position imaginable: rear mounted rear drive, front mounted rear drive, longitudinal or transverse front wheel drive and was used by Volvo in their Daf 55/66 and Volvo 340.
In the late 1950s, Renault engineering, led by the engineer Fernand Picard, decided to develop a modern version of the "Ventoux engine" from the Dauphine for the future Renault 8 model. The engineer designed an all-new small 4-cylinder engine which would eventually evolve from 956cc to 1108cc. Consisting of a cast iron block topped with an aluminum cylinder head, this engine was characterized by its camshaft placed high in the block with short pushrods, and, unusually for the time, five crankshaft bearings. From the first test, it showed more torque and considerably more power than the 850cc Ventoux, whose design dated back to 1944. It was baptized the "Sierra", because at that time, Renault had not yet adopted its later scheme of designating each engine design with a letter. It was later that it took the name "Cléon", referring to the plant where it was made, combined with "Fonte" (meaning "cast-iron" in French) to distinguish it from the aluminum-block Renault 16 Cléon-Alu engine; it was later shortened to the "C engine."
The engine made its official debut at the Geneva Motor Show in the new 1962 Renault Floride S, replacing the 850cc 40 hp Dauphine Gordini. The 956cc capacity, which delivered a dozen additional horsepower, (51 hp SAE),a few months later was seen in the new R8 sedan. For racing and motorsport versions, Amédée Gordini was responsible for designing a hemispherical combustion chambered head allowing 85-90 hp for a 1000cc version as opposed to 70 hp for the previous 700cc Gordini engine. Gordini revealed some weaknesses in the rigidity of the block which could lead to blown head gaskets; this prompted Renault to stiffen the block slightly.
1963 saw an 1108cc version of the engine introduced. This was fitted to the latest version of Renault Floride/Caravelle, a car whose timid performance was greatly improved. The bore of the 1108cc was increased to 70 mm, giving greater torque and power.
In the late 1960s, the Cléon-Fonte was the engine of any small Renault. Installed in both the R8 and R10 sedans of the time, it was also produced in Valladolid, Spain. At the end of 1966, to power the new R8 Gordini 1300, it received a new block with a specific lateral offset crankshaft, this time 1255cc in capacity and producing 88 hp DIN.
At the close of 1969, Renault launched its front-wheel drive R12. Now known as the "C-Engine", the "Cléon-Fonte" was installed, this time ahead of the driver. It was reworked to a displacement of 1289cc producing 54 bhp and had a uniform spacing between the cylinders. Despite the engine's flexibility, it was not powerful enough to power the sporty versions of the R12 and Alpine Berlinetta. This 1289cc version was installed in the R12 and R15 TL. Mated to a new front drive transaxle, the 956cc version of C-engine was now found under the hood of the R6, and later in the R5.
In this time period, Renault chose small saloon cars to represent the company in automobile racing. To do this, Renault began with work similar to that Gordini had done 10 years earlier, but at a much lower cost. The "Cléon-Fonte", now with a new hemispherical head, was pushed to 1397cc producing 93 hp in the 1976 R5 Alpine/Gordini; power output increased to 110 bhp in 1981 for the R5 Alpine/Gordini Turbo.
Meanwhile, the R4 GTL had received the 1108cc version; the basic model retained its ancient "Billancourt" 850cc engine, but in 1986 the R4 was entirely C-engine powered, the base model receiving the 956cc unit. The new R18, which succeeded the R12, received the 1397cc version of this engine, with a standard cylinder head, and several options for power specifications. It is in this capacity, but now in a transverse position, this unit found its way under the hood of the R9, (car of the year 1982) and its sister R11, then under the Super 5 in 1985.
The Renault 9 and Renault 11 were important developments for Renault as they inaugurated a new technical philosophy that would be used on many models. Indeed, the chassis was reused for the Renault 19 , Megane 1 and Scenic 1; derivatives were used for the Super 5 , Express, Clio 1, Clio 2, Kangoo 1 and Twingo 2. The Renault 9 and Renault 11 were the first cars to use a Renault engine in a transverse position, which gave rise to the "JB" gearbox which was used until the Twingo 2.
Renault chose to use the turbocharged 1.4 litre Cléon engine in several cars of the early 1980s. The pushrod Cléon engine was chosen for its sturdiness and low cost. For cost concerns it was fitted with a Solex carburetor, albeit a special unit made from magnesium in order to withstand the high heat from the turbocharger.
At the end of 1980, thanks to a big turbo, the impressive 160 hp R5 Turbo was launched. Mounted in a mid-engined position for the first time, this 1397cc unit was coupled to the transmission of the R30 TX and drove the rear wheels. The R5 Turbo engaged in group B rallying and gradually saw its power rise from 200 to 300 hp peaking at 360 in (1527cc form) in 1985; the C-engine hit 385 hp in 1987 on the tour versions of the championship Blockbuster, benefiting from the 1500 turbo technology in Formula 1, which included the injection of water into the intake.
After the arrival of the Renault R19 and Clio in the early 1990s, this engine (which however has adapted very well to changing emission standards, with injection and catalytic converters) lived its last days alongside its replacement, the "Energy" engine.
When the Renault 14 was released in 1976, it was thought that the Cléon-Fonte engine would disappear since the 14 was equipped with the "X engine" of the Society Française de Mécanique common to Peugeot and Renault. This collaboration with the main competitor at the time was badly perceived by customers and the Renault service network. So, for the Renault 9 and Renault 11 to replace the Renault 14 , Renault returned to the Cleon-Fonte engine that was already starting to be considered an antique in the early 80s. The Renault 9 gave a second life to the Cléon-Fonte, which was mounted transversely, a first for Renault, and coupled to the JB gearbox.
Renault was about to stop production of this engine when the Twingo required a compact unit, marking its return to manufacture, this time bored out to 1239cc. Many journalists panned the Twingo for using this engine. The Energy and Clio R19 engine, due to its overhead cam, hemispherical cylinder head design with exhaust ports at the front of the head, could not go under the hood of the little Twingo. However in late 1996, the new 1149cc D7F engine, which was more modern, replaced the long serving Cléon engine in the base model Clio and the Twingo.
The Cléon-Fonte engine was thus resurrected twice, first by the Renault 9 in 1981 and again in 1993 by the Twingo.
The Cléon-Fonte continue to be manufactured by Dacia until the end of 2004 in R12 derived saloons.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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