Is it okay to idle the engine above 6000 RPM?
2 Answers
Short periods of idling at high RPM generally have minimal impact. However, prolonged neutral gear revving can cause severe incomplete combustion. If this unburned fuel-air mixture ignites outside the combustion chamber, it may lead to vehicle self-ignition. Additionally, incomplete combustion more readily produces carbon deposits that can clog the catalytic converter, causing abnormal overheating. Such high temperatures may result in wiring fires with serious consequences. Manufacturers implement rev limiters precisely to prevent excessive engine RPM during neutral revving. Without these protective measures, engines could indeed exceed 10,000 RPM. For modern passenger car engines, the maximum power output typically occurs between 5,500-6,500 RPM. Exceeding this range significantly accelerates wear on engine friction components.
I often encounter similar issues when driving myself. Revving the engine above 6000 RPM without load is really not a good idea—it's too risky. Without load, component wear accelerates, and pistons and bearings may not hold up, leading to cylinder scoring or part burnout over time. I once witnessed a friend's engine overheat and fail after prolonged high-RPM idling, costing thousands in repairs. Additionally, oil pressure may become unstable, leading to inadequate lubrication and internal damage. More severely, the cooling system could fail, causing the radiator to burst. It's advisable to keep the engine within the normal idle range of 1000-2000 RPM, especially avoiding heavy throttle during cold starts. Developing good driving habits can extend engine life by two to three years, saving money and ensuring safety.
