An engine misfire is easy to detect: your car struggles to accelerate (feels weak), you get a lot of vibration (more like a shudder), and ,your fuel consumption goes through the roof! That said, I've got two notorious candidates:ġ) A bad spark plug gives you a misfire. This eliminates “deep" stuff like piston rings. See what I did? User serviceable means you don't really, absolutely, need a trained mechanic to help you service (fix) it. What single, user-serviceable component of a car has the biggest impact on fuel economy ,when it goes bad,? So I'll answer it with a slight modification: What component of a car has the biggest impact on fuel economy?Īs others have pointed out, this question leaves so much to interpretation. It also means the engine doesn't stall, as the slip in the torque converter prevents the engine ever feeling the entire rolling mass over a very short period of time. This fluid drags the car along which is why you have to keep your foot on the brake when stopped. In an auto (the more traditional type) which has a torque converter, a fluid coupled device which connects the engine and gearbox, the idling engine is always connected to the wheels by the fluid. Obviously give it a little more revs and you can be much less gentle and pull away faster. Let the clutch out very, very gently and you can pull away at idle rpm. Once a few cylinders fail to fire the engine doesn't have any momentum left to keep turning so it stops. The piston can't move down when the fuel ignites there is too much load. This load is greater than the power the engine is outputting as it is at low rpm (idle), the combustion in the cylinders isn't happening often enough, or forcefully enough to produce enough power to overcome this so the engine is forced to stop. Why do manual transmission cars stall if you let go of the clutch completely without applying a bit of throttle? Why don't they just move forward with the idle power?īecause suddenly engaging the clutch rather than gently, loads the engine rapidly with the rolling mass of the entire vehicle and its contents. ,Speed of the vehicle depends on the gear ratios, on the weight of the vehicle, wheel diameter, drivetrain reduction, whether or not you use a turbo/supercharger and several other factors. This is why a conventional car as well as a tractor may have the same cc engine, yet such difference in speeds., Thus if your vehicle requires more torque(heavy vehicles) more of the power is converted to torque, automatically reducing rpm. T,he way this power is utilized determines the speed. A greater cc engine means greater fuel ignition, in turn more power. What does CC of any vehicle depict and why it is considered for calculating speed?ĬC is basically cubic centimeters, the conventional unit for volume (1000cc = 1L).ĬC of any vehicle is basically the approximate value of the engine displacement, which is the volume swept by each piston during an engine stroke multiplied by the number of cylinders an engine has.ĬC essentially does not contribute to the speed, but to power the engine can deliver.
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