POLL: Warming up the BNS engine at idle; yay or nay?
Question - warming up the car in idle:
a) After a short stay - 12h to 1day (enough to cool down) - Yay/Nay?
b) After a long stay - 1 week to 4 weeks (enough that all motor-oil flows down to sump) - Yay/Nay?
c) After a cold winter night - 12h to 1 day below freezing point - Yay/Nay?
Example answer - warming up at idle: *my answers
a) Nay - rich injection damaging walls
b) Yay - no oil on components; wait for proper lubrication
c) Nyay - idle for 2 or 3min so the oil in the transmission & engine warm up just a bit
My car usually sits for a longer period in the garage and when I fire it up again for the first time I normally let the oil reach 60°C before I even think about reving it above idle. My thinking was always:
- At idle fluids flow slower and the air doesn't pass through the coolers; thus the engine would warm up faster
- Oil lubrication - when the oil is cold it doesn't lubricate as well when at a specific temp.; thus when driving the car with cold oil the components aren't lubricated properly
But I have found a lot of reasonable arguments against idling the car for a prolonged period to warm up and this writing sums it up:
In the thick of winter, the common wisdom is that when you are gearing up to take your truck out in the cold and snow, you should step outside, start up your engine, and let it idle to warm up. But contrary to popular belief, this does not prolong the life of your engine; in fact, it decreases it by stripping oil away from the engine's cylinders and pistons.
In a nutshell, an internal combustion engine works by using pistons to compress a mixture of air and vaporized fuel within a cylinder. The compressed mixture is then ignited to create a combustion event—a little controlled explosion that powers the engine.
When your engine is cold, the gasoline is less likely to evaporate and create the correct ratio of air and vaporized fuel for combustion. Engines with electronic fuel injection have sensors that compensate for the cold by pumping more gasoline into the mixture. The engine continues to run rich in this way until it heats up to about 40 degrees Fahrenheit.
"That's a problem because you're actually putting extra fuel into the combustion chamber to make it burn and some of it can get onto the cylinder walls," Stephen Ciatti, a mechanical engineer who specializes in combustion engines at the Argonne National Laboratory, told Business Insider. "Gasoline is an outstanding solvent and it can actually wash oil off the walls if you run it in those cold idle conditions for an extended period of time."
The life of components like piston rings and cylinder liners can be significantly reduced by gasoline washing away the lubricating oil, not to mention the extra fuel that is used while the engine runs rich. Driving your car is the fastest way to warm the engine up to 40 degrees so it switches back to a normal fuel to air ratio. Even though warm air generated by the radiator will flow into the cabin after a few minutes, idling does surprisingly little to warm the actual engine. The best thing to do is start the car, take a minute to knock the ice off your windows, and get going.
Of course, hopping into your car and gunning it straightaway will put unnecessary strain on your engine. It takes 5 to 15 minutes for your engine to warm up, so take it nice and easy for the first part of your drive.
Warming up your car before driving is a leftover practice from a time when carbureted engines dominated the roads. Carburetors mix gasoline and air to make vaporized fuel to run an engine, but they don't have sensors that tweak the amount of gasoline when it's cold out. As a result, you have to let older cars warm up before driving or they will stall out. But it's been about 30 years since carbureted engines were common in cars.
So unless you're rolling in a 1970s Chevelle—which we assume isn't your daily driver—bundle up, get into that cold car, and get it moving.
In a nutshell, an internal combustion engine works by using pistons to compress a mixture of air and vaporized fuel within a cylinder. The compressed mixture is then ignited to create a combustion event—a little controlled explosion that powers the engine.
When your engine is cold, the gasoline is less likely to evaporate and create the correct ratio of air and vaporized fuel for combustion. Engines with electronic fuel injection have sensors that compensate for the cold by pumping more gasoline into the mixture. The engine continues to run rich in this way until it heats up to about 40 degrees Fahrenheit.
"That's a problem because you're actually putting extra fuel into the combustion chamber to make it burn and some of it can get onto the cylinder walls," Stephen Ciatti, a mechanical engineer who specializes in combustion engines at the Argonne National Laboratory, told Business Insider. "Gasoline is an outstanding solvent and it can actually wash oil off the walls if you run it in those cold idle conditions for an extended period of time."
The life of components like piston rings and cylinder liners can be significantly reduced by gasoline washing away the lubricating oil, not to mention the extra fuel that is used while the engine runs rich. Driving your car is the fastest way to warm the engine up to 40 degrees so it switches back to a normal fuel to air ratio. Even though warm air generated by the radiator will flow into the cabin after a few minutes, idling does surprisingly little to warm the actual engine. The best thing to do is start the car, take a minute to knock the ice off your windows, and get going.
Of course, hopping into your car and gunning it straightaway will put unnecessary strain on your engine. It takes 5 to 15 minutes for your engine to warm up, so take it nice and easy for the first part of your drive.
Warming up your car before driving is a leftover practice from a time when carbureted engines dominated the roads. Carburetors mix gasoline and air to make vaporized fuel to run an engine, but they don't have sensors that tweak the amount of gasoline when it's cold out. As a result, you have to let older cars warm up before driving or they will stall out. But it's been about 30 years since carbureted engines were common in cars.
So unless you're rolling in a 1970s Chevelle—which we assume isn't your daily driver—bundle up, get into that cold car, and get it moving.
How do you handle starting your RS?
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Originally Posted by Mr.Wrong
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