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Valve float is an adverse condition which can occur at high engine speeds [1] when the poppet valves in an internal combustion engine valvetrain do not properly follow the closure phase of the cam lobe profile. This reduces engine efficiency and performance.
These valves have been unpopular with some drivers and are sometimes removed in favour of a conventional clutch action. [2] The BMW valve takes the form of a separate pipe fitting and is easily removed. Honda has also used clutch delay valves on some Civic models, which are integral to the clutch slave cylinder and must be dismantled in situ. [3]
The BMW M3 DTM is a DTM touring car constructed by the German car manufacturer BMW. It was developed in 2010 and has been raced in DTM seasons since their return to the sport after 20 years absence in 2012 until the end of 2013 season before it was succeeded by BMW M4 DTM. It was designed by BMW chief engineer Dominic Harlow. The M3 DTM was ...
The M3 is the most performance oriented version of the 3 Series. It is designed and developed by BMW's in-house motorsport division, BMW M. M3 models have been derived from the E30, E36, E46, E90/E92/E93, and F30 (designated F80) 3 series and have been marketed with coupé, sedan and convertible body styles. Upgrades over the "standard" 3 ...
BMW announced the M3 GTS in November 2009 and began production in 2010. The GTS was designed as a "road-legal clubsport-oriented model" and produced only in the coupé body style. Changes over the regular M3 include an upgraded engine, reduced curb weight, revised suspension, upgraded brakes and adjustable aerodynamics.
The BMW S65 is a naturally aspirated V8 petrol engine which was produced from 2007 to 2013. Its main use was in the BMW M3 (where it replaced the BMW S54 straight-six engine). There is no direct replacement for the S65, since the following generation of M3 switched to a turbocharged straight-six engine (the BMW S55 ).
The M3 models based on the F30 3 Series were introduced in 2014. Designated F80 for the M3 (sedan) alongside F82 for the M4 (coupe), it is the first time an M3 has used a separate model code, and the first time an M coupe was designated M4. They are powered by the S55 twin-turbocharged straight-six engine. Production of the M3 ended in 2020. [47]
The BMW M57 is a straight-6 diesel engine produced from ... Every cylinder has two inlet and two exhaust valves as well as two chain ... history and common problems.