Timeline for How to reduce engine drag
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2017 at 12:47 | history | edited | CommunityBot |
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| Jun 3, 2012 at 22:13 | answer | added | Cynthia Avishegnath | timeline score: 0 | |
| May 31, 2012 at 9:17 | comment | added | Nick C♦ | If your car cannot maintain a constant speed with light throttle pressure, you are in the wrong gear. When you lift off the pedal completely, the car will decelerate through engine braking - If the car automatically disconnected the engine you'd lose the engine braking! In fact, in some jurisdictions, it is illegal to drive with the car out of gear (or the clutch held depressed) as you are not considered to be in full control of the vehicle | |
| May 31, 2012 at 8:39 | answer | added | Rory Alsop | timeline score: 3 | |
| May 31, 2012 at 6:16 | comment | added | theUg | First, remember, with throttle released, engine is not idling, FI completely shuts-off the fuel (unless, of course, the grade is long enough for the engine to reach idling speed and chug along, though if I can get to 20 mph in third on flat, why would not fifth push it on the downgrade?). Second, with motor disengaged (i.e. in the absence of engine braking), the vehicle should accelerate indefinitely (if slowly), not just maintain the velocity (theoretically, up until aerodynamic drag neutralizes the effects of gravity — I’ve experienced that effect when downhill skiing at high speeds). | |
| May 31, 2012 at 5:36 | comment | added | Cynthia Avishegnath | On a long country road drive travelling at 2-3 degrees down slope at 40 mph, the idling engine on highest gear drags the car down to 30 mph. If I accelerated it back to 40 mph and then freed the clutch, it would sustain 40 mph. | |
| May 31, 2012 at 5:15 | comment | added | theUg | Why would idle drag your speed down (given proper gear choice)? I have 1986 old beat-up BMW with 425 000 km (265 000 mi) on the odometer, and it can run away from me on the parking lot in third gear on the idle alone (without touching accelerator at all). | |
| May 31, 2012 at 3:13 | answer | added | Nick | timeline score: 0 | |
| May 31, 2012 at 2:30 | history | asked | Cynthia Avishegnath | CC BY-SA 3.0 |