Overcoming turbo lag, managing high temperatures and channeling boost pressure are just a few of the hurdles engineers are solving in the development of boosted small-displacement direct-injection gasoline engines. An industrywide effort to prevent low-speed preignition (LSPI) and Honda’s recent spate of service bulletins issued to correct an overabundance of fuel diluting engine oil in its 1.5L 4-cyl. turbo are examples of additional problems facing small turbocharged DI ...

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