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Old 11-02-2007, 03:48 PM   #1
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anyone know the actual power of a motor? like...literally

i guess this falls into the "general" car chat part of this section lol. but i've always wondered, how much power does a motor have? like i mean literally, how strong is the suction, a lot more than a vaccum cleaner? whats the spark like, a lot more than if you stick a fork in an outlet? also did you know that inside a motor when it "explodes" because of the spark, its at 216dB's @ 9:1 compression. i just found that out lol...


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Old 11-02-2007, 07:49 PM   #2
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suction: about 30 hg of vacuum, I think. (hg referring to inches of mercury drawn up a tube, the standard method of measuring vacuum)

spark: potentially 50000 volts, enought to knock you on your ass.

Thanks for the info about the sound level dBs in the engine. Something I didn't know.
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Old 11-02-2007, 09:38 PM   #3
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I have not Measured the vacuum on a DE20, but most engines run around 19-20hg at sea level. I highly doubt these engines are 30, I have never seen a gasoline engine that high, even when running 12.5:1 compression.

As for the spark, its a different kind of voltage. Wall outlets are AC, and here in the states are generally 110VAC. The coil(s) in most modern cars are around 45k volts DC. But there is very little current, just a few milliamps. While most wall outlets are on 20 amp circuits. While the spark from a coil will will hurt (been hit way to many times myself) the only way it could kill you was if it was inserted sub-dermally with a ground also inserted sub-dermally in a way that would cause the voltage to cross through your heart or brain. As for a wall outlet, with 20 amps there it can kill you pretty easily if it was applied to you in a way that prevented you from getting away (such as a bathtub full of water).
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Old 11-02-2007, 09:46 PM   #4
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I have not Measured the vacuum on a DE20, but most engines run around 19-20hg at sea level. I highly doubt these engines are 30, I have never seen a gasoline engine that high, even when running 12.5:1 compression.

As for the spark, its a different kind of voltage. Wall outlets are AC, and here in the states are generally 110VAC. The coil(s) in most modern cars are around 45k volts DC. But there is very little current, just a few milliamps. While most wall outlets are on 20 amp circuits. While the spark from a coil will will hurt (been hit way to many times myself) the only way it could kill you was if it was inserted sub-dermally with a ground also inserted sub-dermally in a way that would cause the voltage to cross through your heart or brain. As for a wall outlet, with 20 amps there it can kill you pretty easily if it was applied to you in a way that prevented you from getting away (such as a bathtub full of water).
That's pretty gruesome information. Why do you know that?
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Old 11-02-2007, 09:56 PM   #5
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Words.
Is there a way you can be only partially shocked by the standard 110 AC in your house? Like if you weren't grounded properly?

Because I'm pretty sure I didn't turn off the right breaker last time I put up a ceiling fan and although it was semi painful and quite startling, I seriously doubt it was anywhere near the full 110 volts.
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Old 11-03-2007, 12:51 AM   #6
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I might have seen 30 hg one time long ago on a carbureted engine going downhill, throttle closed. Otherwise, low 20s was more typical for steady speed on level ground. It's all a dim memory now. I wish I had a dash mounted vacuum gauge on the Focus; probably the best fuel economy device a car can have if the driver actually pays attention to it.

As for only being partially shocked, touching a live 110V circuit with one dry hand while standing on a non-conductive surface would qualify. A little zap telling you to "back off". Even then it's 110V but not much amperage (the real killer).
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Old 11-03-2007, 01:07 AM   #7
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Is there a way you can be only partially shocked by the standard 110 AC in your house? Like if you weren't grounded properly?

Because I'm pretty sure I didn't turn off the right breaker last time I put up a ceiling fan and although it was semi painful and quite startling, I seriously doubt it was anywhere near the full 110 volts.
Oh sure, if you touched a wall outlet it would give you a good shock, but you would pull back. Last time I got hit by 110 my arm hurt for an hour or two, but thats about it. If you are in your house, you have a pretty poor ground, because you are standing on either a wood or concrete floor most likely, and if wearing shoes, thats even more insulation.

As for how I know what 110 and automotive ignition coils feel like... Been hit by 110 a few times on accident while working on things, and once with a power tool where the wire frayed. For coils, it was generally while checking for spark, or adjusting timing. The worst though is the magneto off a little engine like a briggs and straton. Those have given me the worst shock I have ever felt. They seem to generate more current than a standard coil.
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Old 11-03-2007, 01:52 PM   #8
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hm interesting info guys..especially about the spark i didn't know it was that powerful. quite the machines they are...
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Old 11-03-2007, 04:54 PM   #9
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I saw a demonstration on TV once of the ignition that occurs inside a diesel cylinder. It was a good 5+ft wall of flame; pretty impressive that they contain that in a pop can sized cylinder.
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Old 11-03-2007, 05:40 PM   #10
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this is some really interesting information.... i can however vouche for the vacuum readings though as my car obviously has a vac/boost gauge. though the highest vacuum ive ever managed to get was 28 which decelerating with the throttle closed.
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