Step 5: 5. some mistakes about car efficiency tips
You usually heard that some ways to spend less amount of fuel is, for example, turn the engines in stops, if are longer than 30 seconds. Well, is true that you save some gas stopping the engine, but that's not true as people believe.
In carb engines, the theory is false, because carbs need an amount of fuel to get the car started, i mean, a rich mixture into the engine, to get a correct startup.
In an EFI engine, the theory is correct, because injectors, don't need that amount of fuel as carb engines need, the CPU constantly calcules the correct amount of fuel
But in real life is completely wrong, because the engine needs lubrication and if you're constantly starting and stopping, the contrast of temperature, of cold-hot-cold-hot, it affects to the engine durability, because happens the same thing as the desert, days are extremely hot, and nights extremely cold, that's the reason of the sand, the rocks crack, and crack again, making that "mini rocks" that's the sand.
That's one of the consequences.
Another is, if you start and stop the car, the piston is hot, because the heat of explosions, the piston expands, and needs the lubrication of oil to make a wall that separes the hot piston with the cold block. Ok, so what happens if you cut the oil flow inside your engine?
You're always see on winter people that get sticked his tongue in a frozen metal part when they lick them. In the engine happens somehow something similar, the piston is the tongue and the block the frozen metal, so you can throw away your engine, because the piston is welded to the block, and you can't do nothing for save it, even the cranckshaft, because as the repentine stop, the most probably is that the crankshaft breaks and make a very cool mess.
Well, as I say in step one, that's my first instructable, thanks for watching! all the comments, and constructive crytics are accepted ;)
In carb engines, the theory is false, because carbs need an amount of fuel to get the car started, i mean, a rich mixture into the engine, to get a correct startup.
In an EFI engine, the theory is correct, because injectors, don't need that amount of fuel as carb engines need, the CPU constantly calcules the correct amount of fuel
But in real life is completely wrong, because the engine needs lubrication and if you're constantly starting and stopping, the contrast of temperature, of cold-hot-cold-hot, it affects to the engine durability, because happens the same thing as the desert, days are extremely hot, and nights extremely cold, that's the reason of the sand, the rocks crack, and crack again, making that "mini rocks" that's the sand.
That's one of the consequences.
Another is, if you start and stop the car, the piston is hot, because the heat of explosions, the piston expands, and needs the lubrication of oil to make a wall that separes the hot piston with the cold block. Ok, so what happens if you cut the oil flow inside your engine?
You're always see on winter people that get sticked his tongue in a frozen metal part when they lick them. In the engine happens somehow something similar, the piston is the tongue and the block the frozen metal, so you can throw away your engine, because the piston is welded to the block, and you can't do nothing for save it, even the cranckshaft, because as the repentine stop, the most probably is that the crankshaft breaks and make a very cool mess.
Well, as I say in step one, that's my first instructable, thanks for watching! all the comments, and constructive crytics are accepted ;)
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1
StuNutt
says:
Sep 23, 2010. 3:39 PMReplyThe "Spanish English" was a bit of a struggle in places, but the meaning was clear and a lot of good advice - Thanks.
2
jimmytvf (author)
in reply to Sep 23, 2010. 11:51 PMReply
not sure what you mean, but thanks for told me that i made a kinda clearly instructable
theexpert
in reply to Jul 2, 2011. 7:03 PMReply
some of your wording is off but other than that i liked the hole instructable and i still did understand
fwater
says:
Sep 11, 2009. 7:38 AMReply
Well said. Too many myths abound concerning increasing gas mileage, and you see the "stop the engine at traffic lights" often. It would be interesting to see a study done on how much undue wear is created from some of these myths such as driving a cold engine and short-shifting (not letting an engine operate at medium RPMs where the volumetric efficiency is far higher than at low RPMs).
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