Auto manufacturers will be required by government standards to improve their passenger vehicle fuel economy from an average of 35.5 mpg in 2016 to 54.5 in 2025. To achieve this goal while maintaining performance, automakers have focused on shrinking gasoline engines. Ford and General Motors have each launched 3-cylinder, 1.0L boosted engines (EcoBoost and Ecotec, respectively) that deliver the same output as their 1.6L 4-cylinder engines, but with roughly a 20% improvement in fuel economy and lower CO2 emissions. Higher pressure turbocharged, gasoline direct injection (TGDI) engines technology has proliferated rapidly in the last five years and this trend is expected to continue gaining momentum. Ford and GM plan to increase production of these engines to meet growing consumer demand in markets worldwide. Ford is producing 100,000 EcoBoost engines per month, and aims to offer the technology in approximately 80% of its vehicles. GM expects to produce 2.5 million units annually at five global plants by 2018.

WHAT IS LOW SPEED PRE-IGNITION (LSPI)?

Low-speed pre-ignition (LSPI) is an unexpected consequence of downsizing and boosting engines. Also known as stochastic pre-ignition (SPI), “Megaknock”, “Superknock” or “Deto-knock.” LSPI most commonly occurs at low speeds during a period of rapid acceleration. It is believed to be caused by particles in the combustion chamber oil droplets — combinations of fuel and oil—that ignite prior to spark, resulting in uncontrolled, abnormal combustion. This creates spikes in engine pressure, ultimately causing internal engine damage. In some cases, just a single LSPI event has been sufficient to cause severe engine damage. LSPI is poised to become a major service/repair issue. Just five years from now, it’s estimated that a quarter of all cars on the road in North America and 39% of global production will be using the new engines. While the new downsized, boosted gasoline engines provide definitive fuel economy benefits, vehicle owners will have to contend with the risk of LSPI damaging vehicles.

PREVENTING LOW-SPEED PRE-IGNITION

At a recent JSAE/SAE Powertrains, Fuels and Lubricants International Meeting, industry experts reached consensus on several key points. LSPI arises from interactions between: engine design and operation,combustion chamber deposits, fuel properties, and lubricants. Hydrotex’s time-tested Injector-Kleen 3000 is specifically designed to clean the entire fuel system and remove combustion chamber deposits. This eliminates hot spots that promote pre-ignition and cause engine knock and piston damage. Adding Injector-Kleen 3000 to your vehicle’s gasoline tank every 3000 miles can prevent thousands of dollars of engine damage.Plus by removing injector deposits, Injector-Kleen 3000 noticeable improves engine performance. Try a bottle of Injector-Kleen 3000 at your next fill-up and watch how quickly it restores horsepower lost to injector deposits.

 

 

John Cummins, Hydrotex VP Product Development, 10/3/17

 

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