When you press the clutch pedal and the accelerator pedal simultaneously in a manual transmission vehicle, a couple of things can happen:
Engine RPM Increase: Pressing the accelerator pedal increases the engine speed or RPM (revolutions per minute). This causes the engine to generate more power.
Clutch Disengagement: Pressing the clutch pedal fully disengages the clutch mechanism, separating the engine from the transmission. This means that the power generated by the engine is not transferred to the wheels.
No Power Transmission: With the clutch disengaged, even if the engine RPM increases due to pressing the accelerator pedal, the increased power does not reach the wheels. The wheels remain stationary or continue to coast if the vehicle was already in motion.
Revving the Engine: Pressing the accelerator pedal while the clutch is fully disengaged causes the engine to rev freely, without any load. This can result in the engine producing a higher pitched sound as the RPM increases.
It's important to note that pressing the accelerator pedal while the clutch is fully disengaged (clutch pedal fully pressed) is not a recommended practice in normal driving. It can cause unnecessary wear on the clutch components and the engine. In a manual transmission vehicle, the typical operation involves pressing the clutch pedal to disengage the clutch, changing gears, and then releasing the clutch pedal gradually while applying the accelerator to smoothly transfer power from the engine to the wheels.