Piston Slap: Parked in the Polar Vortex?
- How long is best to idle a gasoline engine after starting & before driving off: [A] a few minutes? one minute? [C] until the revs settle down? no need, just drive right off? Assume ambient temperature well above freezing; a shifting style on the sedate side; and a car made in the past 15 years so engine has EFI and EGR and all that. Current ride’s engine is naturally-aspirated and direct-injected, but I sure would appreciate knowing the proper protocol for other combinations too, if different. Several sources over the past years have all agreed on for modern engines, but then just a few months back a Car & Driver column said [A], so now I’m unsure again.
- Leaving a car (stick shift *of course*) parked: best in gear, best in neutral, or doesn’t matter? Assume the parking space is either not sloped at all, or is sloped and I know enough to turn a front wheel into the curb toward the down slope.
LD on Feb 10, 2019
I wish more cars had an oil temperature gauge. My Chrysler 300 has a digital oil temperature gauge, besides a digital engine coolant and digital transmission temperature gauge. Here in Canada in winters that is a very useful indicator as to whether the engine has reached it's normal operating temperature. I normally wait for engine rpms to drop below 1000 on a cold start up before driving off slowly. Keep the rpms and engine load low. And even if my trip is short, I try and get the engine oil to get up to it's normal operating temperature which is at least 75 Celsius to 80 Celsius.
George B on Feb 11, 2019
I start the car, wait a few seconds before putting the engine into gear, and then let it warm up by driving slowly/low RPM with very little load on the engine while driving on the residential streets in my neighborhood. No fuel wasted sitting idling as the engine warms up and 10 mph reduces trip time as compared to 0 mph. By the time I get to the main side streets, the coolant temperature is warm enough to heat the car and I drive with moderate acceleration.
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