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- TVR_Speed_Six_engine abstract "The TVR Speed Six was the name of a normally aspirated straight-6 engine manufactured by TVR, and used in several of their cars including the TVR Tuscan, TVR Cerbera, TVR Tamora, TVR T350, TVR Sagaris, and TVR Typhon. It is the most powerful normally aspirated straight-6 engine ever to be fitted to a production car[citation needed].The engine's prototypes (referred to as AJP-6) were designed and delivered by independent engineer Al Melling (the "A" in AJP) as both 3.0 and 3.5 litre units. It is reputed that many of its key design elements (particularly the valvetrain) were first seen in the 1991 Suzuki GSX-R750M motorcycle engine (also a Melling design), and that the head flowed better than the famous Cosworth DFV Formula 1 engine[citation needed].The key design features were an all alloy block and head with twin-cam, finger follower 24-valve actuation, one throttle and injector per cylinder (throttle body EFI), equal length tubular exhaust manifolds and dual 3-way catalytic converters. In addition, the engine is canted 30 degrees to the left with a dry sump lubrication system enabling the engine to be mounted lower in the vehicle chassis. These features enabled the engine to provide lightweight, compact dimensions, extremely fast throttle response and high peak horsepower.The engines that actually went into production however were TVR modified significantly (by John Ravenscroft and Peter Wheeler, the J & P in "AJP") versions of the original AJP-6 prototypes with 3.6 and 4.0 litre capacities. Prominent modifications were a significant alteration to valve train geometry from the original AJP6 design, a switch from a billet steel crank to cast iron (with a crank damper), different con-rods, oil filter relocation to the other side of the engine, and to remove the oil feed from the exhaust side of the cylinder head[citation needed]. The two different capacities were achieved through stroke alterations from a con-rod design able to accommodate two different stroke lengths, and different piston crown designs altering the compression ratios. The bores diameters were shared. It was suggested that the oilway modifications caused poor lubrication and cooling to the head around cylinder 6 leading to premature valvegear failure, detonation, and a reputation for poor durability. Subsequent development work has shown that the primary cause was actually the significantly altered valvetrain geometry from the original AJP6 design[citation needed]. The effects of this were further highlighted by mismatched surface hardnesses between the cam lobes and finger followers resulting in accelerated wear rates to the finger followers. Essentially the TVR 'speed six' version of the original AJP6 design is flawed designTemplate:Whom?, but better quality replacement components help reduce the effects of rapid wear from the poor valvetrain geometry[citation needed]. It is not clear exactly why these modifications were done, however amongst rumours of a soured business relationship between Melling and TVR, it is believed that the primary reason was to reduce the unit production costs. However alternatives to the TVR Speed Six design are now available with a completely redesigned 'bucket' follower version (eliminating the use of finger followers altogether), and also the original AJP6 head design are both being produced by third party specialists and successfully run by their customers.The initial 4.0 litre version of the engine as used in the Cerbera produced 350 bhp (261 kW) with the final incarnations of the engine having outputs of up to 405 bhp (302 kW) in the Tuscan S, Sagaris and Typhon.TVR developed the Speed Six into the limited-production V12 Speed Twelve racing engine.".
- TVR_Speed_Six_engine manufacturer TVR.
- TVR_Speed_Six_engine productionEndYear "2007".
- TVR_Speed_Six_engine productionStartYear "1999".
- TVR_Speed_Six_engine wikiPageID "970121".
- TVR_Speed_Six_engine wikiPageRevisionID "591427396".
- TVR_Speed_Six_engine configuration Straight-six_engine.
- TVR_Speed_Six_engine engine "3.6".
- TVR_Speed_Six_engine hasPhotoCollection TVR_Speed_Six_engine.
- TVR_Speed_Six_engine manufacturer TVR.
- TVR_Speed_Six_engine name "TVR Speed Six engine".
- TVR_Speed_Six_engine production "1999".
- TVR_Speed_Six_engine subject Category:TVR_engines.
- TVR_Speed_Six_engine type Artifact100021939.
- TVR_Speed_Six_engine type AutomobileEngine102761557.
- TVR_Speed_Six_engine type Device103183080.
- TVR_Speed_Six_engine type Engine103287733.
- TVR_Speed_Six_engine type Instrumentality103575240.
- TVR_Speed_Six_engine type Machine103699975.
- TVR_Speed_Six_engine type Motor103789946.
- TVR_Speed_Six_engine type Object100002684.
- TVR_Speed_Six_engine type PhysicalEntity100001930.
- TVR_Speed_Six_engine type TVREngines.
- TVR_Speed_Six_engine type Whole100003553.
- TVR_Speed_Six_engine type AutomobileEngine.
- TVR_Speed_Six_engine type Device.
- TVR_Speed_Six_engine type Automobile.
- TVR_Speed_Six_engine type TransportationDevice_Vehicle.
- TVR_Speed_Six_engine type DesignedArtifact.
- TVR_Speed_Six_engine comment "The TVR Speed Six was the name of a normally aspirated straight-6 engine manufactured by TVR, and used in several of their cars including the TVR Tuscan, TVR Cerbera, TVR Tamora, TVR T350, TVR Sagaris, and TVR Typhon. It is the most powerful normally aspirated straight-6 engine ever to be fitted to a production car[citation needed].The engine's prototypes (referred to as AJP-6) were designed and delivered by independent engineer Al Melling (the "A" in AJP) as both 3.0 and 3.5 litre units.".
- TVR_Speed_Six_engine label "TVR Speed Six engine".
- TVR_Speed_Six_engine label "TVR・Speed Six".
- TVR_Speed_Six_engine sameAs TVR・Speed_Six.
- TVR_Speed_Six_engine sameAs m.03vfc6.
- TVR_Speed_Six_engine sameAs Q7672224.
- TVR_Speed_Six_engine sameAs Q7672224.
- TVR_Speed_Six_engine sameAs TVR_Speed_Six_engine.
- TVR_Speed_Six_engine wasDerivedFrom TVR_Speed_Six_engine?oldid=591427396.
- TVR_Speed_Six_engine isPrimaryTopicOf TVR_Speed_Six_engine.
- TVR_Speed_Six_engine name "TVR Speed Six engine".