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Modern knock control-loop systems are able to adjust ignition timings for every cylinder individually. Depending on the specific engine the boost pressure is regulated simultaneously. This way performance is kept at its optimum while mostly eliminating the risk of engine damage caused by knock (e.g. when running on low octane fuel). [5]
This engine was the same model as that found in the UCF30 Lexus LS. The SC 430's V8 could produce 288 hp (215 kW) and 430 N⋅m (317 lb⋅ft) of torque, allowing the coupe to go from 0–60 mph in 6.2 seconds. [24] 2001–2005 Lexus SC 430
The reduced engine speeds allow more time for autoignition chemistry to complete thus promoting the possibility of pre-ignition and so called "mega-knock". Under these circumstances, there is still significant debate as to the sources of the pre-ignition event. [3] Pre-ignition and engine knock both sharply increase combustion chamber temperatures.
To detect knock, a piezoelectric knock sensor (basically a microphone) bolted to the engine block responds to unique frequencies caused by engine knock. The sensor generates a small voltage that is sent to the electronic control unit , which processes the signal to determine if, in fact, knock is occurring.
The 4.0 L (3,969 cc; 242.2 cu in) all-alloy 1UZ-FE debuted in 1989 in the first generation Lexus LS 400/Toyota Celsior and the engine was progressively released across a number of other models in the Toyota/Lexus range. The engine is oversquare by design, with a bore and stroke size of 87.5 mm × 82.5 mm (3.44 in × 3.25 in). [2]
SC 430, SC430, or SC-430 may refer to: Konig SC 430 aircraft engine; Lexus SC 430 automobile; Santa Catarina SC-430, a highway in Brazil; South Carolina Highway 430, ...
Now TEL has been removed, we don't seem to have reverted to having a problem with knocking. How so? Was there never really a problem to solve or have we found a modern solution that renders TEL unnecessary? If so it isn't discussed here. Atconsul 16:28, 9 October 2023 (UTC) The potential problem of detonation remains as high as ever.
This engine is only used on hybrid models in China. Similar to the A25A-FXS engine used in other markets. Applications (calendar years): 2018–present Lexus ES 300h (China) (AXZH10) 2022–present Lexus NX 350h (China) (AAZH20) 2022–present Lexus NX 400h+ (AAZH21) 2023–present Alphard Hybrid/Crown Vellfire Hybrid (China) (AAHH45)