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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2006Idling Car
I started my 86 Toyota Corolla SR5 up to charge up the battery. I forgot about it, and left it idling in the driveway for a couple of hours. Did I do any damage to it? I have plenty of oil in it. I am concerned about oil pressure. Thanks. > I started my 86 Toyota Corolla SR5 up to charge up the battery. I forgot > about it, and left it idling in the driveway for a couple of hours. [quoted text clipped - 3 lines] > > Thanks. Probably not. About the only damage you can do to a car by letting it idle for awhile is if it is on a hot day. It might overheat. Otherwise, oil pressure doesn't 'pump up' over time. Tt gets to its max 'pressure' within 30 seconds of starting the car, and stays there (or decreases slightly once it warms to operating temp). -phaeton > About the only damage you can do to a car by letting it idle for awhile > Otherwise, oil pressure > doesn't 'pump up' over time. Er.... i meant "oil pressure doesn't 'pump up' or diminish over time" doing too many things at once... -phaeton > I started my 86 Toyota Corolla SR5 up to charge up the battery. I forgot > about it, and left it idling in the driveway for a couple of hours. [quoted text clipped - 3 lines] > > Thanks. Normally, no damage would be done by idling like that. Many vehicles are idled for long periods. However, running the vehicle to charge up a badly discharged battery is not such a good thing for your alternator. A separate charger is the best way to handle that. And if you need a battery, buy one. If you merely started it because it had been sitting unused for a period of time, you have no problem. > Did I do any damage to it? I have plenty of oil in it. I am concerned > about oil pressure. No one mentioned the aspect of the cylinders and pistons only being lubricated via 'splash oiling'. This may or may not be an issue. I keep telling myself while I am sitting in my car anytime that requires idling for any amount of time - "relax. the top half of the piston sees very little oil anyway. don't rev it. don't rev it." I tap the accelerator anyway. Just to spin the crank a tad faster just to throw that little bit extra oil onto the bottoms of the pistons. Am I paranoid? Yes, I think so. Police cars do a lot of idling... bob z. ps: yes, my car is very quiet and no one knows that i am slightly rev'ing my engine in the drivethru :~)> >>Did I do any damage to it? I have plenty of oil in it. I am concerned >>about oil pressure. [quoted text clipped - 15 lines] > rev'ing my engine in the drivethru > :~)> Unless you have a Briggs motor under your hood, you're getting more than splash oiling going throughout the system. >>> Did I do any damage to it? I have plenty of oil in it. I am concerned >>> about oil pressure. [quoted text clipped - 17 lines] > > Unless you have a Briggs motor under your hood, Or a Chevy straight six :-p you're getting more than > splash oiling going throughout the system. True. There are small holes at the junction of the connecting rod cap and the rod, which squirt oil on the underside of the piston crowns as the crankshaft oil hole rotates past (on V-type engines). On inlines, there may be a drilled hole in the conrod, or a dedicated oil squirter, or just the leakage flung out of the sides of the conrod bearing under pressure. > or just the leakage flung out of the sides of the conrod bearing under > pressure. That is the part I like. The leakage being flung around. I mean, it works, right? How many times does one piston go up and down during the average lifespan? How many straight line miles has the piston traveled inside the cylinder. Pretty awesome stuff if you think too much about it. If you are a paranoid, anal freak like me. bob z. > Unless you have a Briggs motor under your hood, you're getting more than > splash oiling going throughout the system. -begin sarcasm - Really? I wondered what all of those gun-drilled passages were for... -end sarcasm - :~)> bob z. >Unless you have a Briggs motor under your hood, you're getting more than >splash oiling going throughout the system. In terms of oil circulation, the Toyota 2TC is only a small step above the Briggs lawnmower engine. Incidentally, these things are notorious for oil pump failures so always keep an eye on the gauge. --scott  Signature"C'est un Nagra. C'est suisse, et tres, tres precis." |
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