# Driving car with half engaged clutch

Say I am driving my car (Hyundai i10) at 2nd gear. My clutch is engaged. As I increase my throttle position, rpm will increase and so will speed of the car till a point when the speed wont increase with increase in rpm as I increase my throttle.

Now 2nd case, I keep on increasing my throttle with my foot on the clutch pressed halfway. So I have disengaged my clutch half. What will happen in this case? What are the changes I can see in the car/engine? Will load increase? How much? Will the pattern be the same for Speed vs Rpm graph (speed increasing with rpm till a point and then becoming constant)?

P.S. plots to explain concepts are most welcome.

• Driving the vehicle in 2nd case for any extended length of time will damage the car. It is not a valid scenario. Feb 5 '16 at 15:26
• @vini_i Can you please elaborate? Why is it not a valid scenario? I have seen people driving with constantly pressing the clutch while driving. Will there be any change in the plots? Feb 5 '16 at 15:38
• If it's actually pressed halfway then clutch slippage might or might not occur. If it does - you will see RPMs rise without speed increasing. If it doesn't - you won't feel anything, but the throwout bearing will wear at an accelerated rate. Feb 5 '16 at 15:43
• Also, I'm not sure why you say that speed will stop increasing with RPM at some point in the first case. It will stop increasing when RPM stops increasing. In the case of fully engaged and not badly worn clutch, that is. Feb 5 '16 at 15:44
• What your asking is akin to; what happens if i drain out the engine oil and fill the engine with noodles. The answer is; it will damage the engine. If you see someone putting noodles in their engine you would stop them. If you see someone constantly pressing the clutch tell them that they will damage their clutch. Feb 5 '16 at 15:46