What are the effects of high RPM in low gear on a car?
3 Answers
High RPM in low gear accelerates wear and tear on the engine and transmission, and it is also quite fuel-consuming. Here is some information about engines: 1. History: Generators refer to mechanical devices that convert other forms of energy into electrical energy, invented by the Frenchman Pixii in 1832. 2. Principle: Generally, generators convert the energy stored in various primary energy sources into mechanical energy through a prime mover, which is then converted into electrical energy by the generator and transmitted via power distribution networks to various usage points. 3. Categories: Generators are divided into DC generators and AC generators, both operating based on the laws of electromagnetic induction and electromagnetic force, and are widely used in industrial and agricultural production, national defense, technology, and daily life.
With 20 years of auto repair experience, I've seen too many cases of high RPM and low gear destroying engines. When you drive like this, the tachometer hits the red zone, the engine screams wildly, and the piston rods endure over three times the normal pressure, leading to rapid metal fatigue. The worst cases are Volkswagen owners who burn through a whole bucket of oil after highway runs. Occasionally downshifting to overtake is fine, but never make a habit of cruising at 4000 RPM in the city—within six months, problems will arise: crankshaft oil seal leaks, valve cover gasket emitting white smoke, and in severe cases, cylinder scoring. To save on repair costs, remember: shifting at 2500 RPM is the safest bet for manual transmissions.
As a Didi driver with 150,000 kilometers of driving experience, it pains me every time I see passengers revving high in manual transmission cars. The most obvious consequence is soaring fuel consumption—a 1.6L car can end up costing as much as a 2.0L. Last week, I tested a Honda Civic in 3rd gear at 5000 rpm running 60 km/h, and the instant fuel consumption showed 16L/100km! Over time, this also leads to carbon buildup, and when the fuel injectors get clogged, acceleration becomes sluggish, with repairs costing around a thousand bucks. In city driving, shifting at 2500 rpm is more than enough. The gear ratios in the transmission are designed for a reason—forcing the engine to work overload is like making someone run while holding their breath, it's just bad for the machine.
