![]() Engines using port fuel-injection typically run lower boost pressures and/or compression ratios than direct injected engines because port fuel injection causes the air/fuel mixture to be heated together, leading to detonation. This is due to the turbocharger/supercharger already having compressed the air before it enters the cylinders. ![]() a turbocharger or supercharger) is used, the compression ratio is often lower than naturally aspirated engines.
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