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Old 10-26-2012, 01:21 PM   #26
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Magnesium is lighter and therefore will cost less to ship back and forth to China.

But production costs more than steel, so that Cruze will now cost as much as the Volt and the Volt will cost more than the ZR1 Corvette. Carbon fiber, the new "economy material".
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Old 10-26-2012, 01:44 PM   #27
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Its what they use in one time use flashbulbs.
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Old 10-27-2012, 10:53 PM   #28
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Originally Posted by SCRAPPYDO View Post
Well it is a good thing magnesium is not highly flammable or anything
It takes some pretty serious heat to ignite the magnesium they use in cars. Once it goes though......

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Originally Posted by b4wantab View Post
Once mag is ignited it will burn and keep burning. Road flairs are basically magnesium. Light a flair and through it in water, it will get brighter and keep going. The water is what caused the accelerated burning. The burning will separate the oxygen from the hydrogen and they will both burn.

Never put of a mag fire with water. Any firemen want to chime in?

Peace,

Greg
That looked like magnesium burning in that video, but didn't look like there was a lot of product. I also don't think that was from a transmission case. There would have been much more of that bright burning and water, of course, would do absolutely nothing. The stuff in the video burned out pretty quick.

He would have gotten that fire out faster if he would have concentrated on the front of the car where the bulk of the fire was .
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Old 10-27-2012, 10:58 PM   #29
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I was expecting footage of LeMans 1955 but this will do.
+1 Exactly what I was thinking. I do hope this turns out to be a prank or myth, because otherwise it is almost too dumb to be true.
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Old 10-28-2012, 09:04 AM   #30
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There was no way that was a magnesium transmission case. Not even close to enough energy release. Maybe the battery popped or something, I don't know, but definitely not a transmission case.

It's really, really hard to ignite a large block of magnesium in a normal fire. Powder, yes, like the flash bulb and road flares people are using as example, but not a solid chunk of mg. Not enough surface area, too much thermal conductance.

Sheet metal, eh, maybe. I wouldn't worry about it though. If you're still in the car by the time the magnesium ignites you're already dead as a doornail.


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Originally Posted by SCRAPPYDO View Post

fast forward to about the 1 minute mark when the magnesium transmission case gets hit with the water...

Last edited by sniper1rfa; 10-28-2012 at 09:13 PM.
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Old 10-28-2012, 09:46 AM   #31
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GM already has a magnesium front crossmember in the C6 Z06. This didn't come out of nowhere...I bet they are refining a process they already have.
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Old 10-28-2012, 10:10 AM   #32
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It's funny people think a large corporation like GM with talented chemists, physicists, and engineers wouldn't know the danger of Mg.

Lots of elements are dangerous, but correct mixture or combinations of elements can stabilize molecule structure.
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Old 10-28-2012, 10:17 AM   #33
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The BMW's N52 engine uses a mag block (24% lighter than alu block). Haven't heard of any 330i's bursting into flames...
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Old 10-28-2012, 12:33 PM   #34
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It's funny people think a large corporation like GM with talented chemists, physicists, and engineers wouldn't know the danger of Mg.

Lots of elements are dangerous, but correct mixture or combinations of elements can stabilize molecule structure.
Well, these large corporations don't have a spotless record when it comes to safety especially when it cuts into profits. Our lives are just a variable in a profit equation for these corps.
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Old 10-28-2012, 01:02 PM   #35
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It's funny people think a large corporation like GM with talented chemists, physicists, and engineers wouldn't know the danger of Mg.

Lots of elements are dangerous, but correct mixture or combinations of elements can stabilize molecule structure.
Or people just think it is funny. Molecule structure is what you think people are worried about? More like reactivity I have a big hunk of magnesium alloy I want to try and burn someday.
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Old 10-28-2012, 08:43 PM   #36
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I can't remember where I read it. But the article talks about how car companies are trying to make lighter cars, but it get's cancelled out because americans are getting fatter. we are nation of fatties

Also, not too keen on magnesium. They burn hot as hell. Their burning temp is off the chart. I'm sure the GM knows properties of magnesium.

Hopefully, it will turn out well. If not, there will be crap load of people ready to sue.
Get a bigger chart. It burns at 3100ºC

You people make it sound like GM is planing on building body panels out of C4 for ****'s sake. Magnesium has been used in consumer goods and automotive applications (not to mention aerospace since WWII) for decades. It takes a LOT to ignite magnesium, especially a large chunk of it. If you have a fire hot enough to autoignite a large piece of magnesium you're in trouble no matter what. What is used is likely an alloy of magnesium that has an increased autoignition temperature by design anyway.

Hell, since 2006 GM has used a magnesium alloy for the engine cradle in Z06s and you don't hear about those spontaneously igniting and blowing a crater a mile deep in the earth.

Last edited by skywaffles; 10-28-2012 at 08:49 PM.
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Old 10-28-2012, 09:02 PM   #37
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Or people just think it is funny. Molecule structure is what you think people are worried about? More like reactivity I have a big hunk of magnesium alloy I want to try and burn someday.
A stabilized substance changes the reactive characteristics. Besides, many things can go wrong with cars as of right now. We all put highly flammable substances in them right now.

Research and engineering can overcome anything. Don't believe in obstacles holding back progress.
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Old 10-30-2012, 01:35 AM   #38
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It's funny people think a large corporation like GM with talented chemists, physicists, and engineers wouldn't know the danger of Mg.
Talented is one word for it. Not the one I'd choose, but hey, whatever floats your boat.
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Old 10-30-2012, 03:23 PM   #39
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Magnesium bodied GM vehicles used to transport molten lava will still combust at a lower % than parked Ferraris.
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Old 10-30-2012, 03:26 PM   #40
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Magnesium bodied GM vehicles used to transport molten lava will still combust at a lower % than parked Ferraris.
The Fiero was known for bursting into flames long before anyone tried to convert one into a Ferrari.
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Old 10-30-2012, 04:01 PM   #41
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They have been making magnesium transfer cases for trucks for years.
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Old 10-31-2012, 08:16 AM   #42
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Both my chainsaws have mag cased engines. I run them very hard with no truoble at all.
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Old 11-04-2012, 03:52 AM   #43
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many years ago....there was a regional warehouse for lawn boy in the area where i was living.....there was a fire that spread to the building where the lawn boy parts were stored

iirc, at that time, there was a product recall on various push style mowers that used Mg decks....so there were a LOT of these mg parts in the warehouse

they caught fire and, of course, the local yokle FD didnt know to not use water on them and/or didnt really know what was burning

they started by spraying down the roof of the building...which held a lot of the water....the roof colapsed and dumped a big slug of water on the fire and BOOM

the cloud of smoke was HUGE and visible for miles

it was a miracle that nobody was badly injured or killed as it totally flattened that whole corner of the industrilal park where the fire was
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Old 11-04-2012, 09:05 AM   #44
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Hell, since 2006 GM has used a magnesium alloy for the engine cradle in Z06s and you don't hear about those spontaneously igniting and blowing a crater a mile deep in the earth.
Exactly my point! This is why I have been insisting folks do the right thing by offloading their highly flammable late gen Z06s to me for pennies on the dollar. I will find a way to safely dispose of them.
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Old 11-04-2012, 12:23 PM   #45
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Ah, magnesium. What that Mercedes was made of in the infamous grand prix crash that killed the record number of spectators and they couldn't stop the metal fire. Excellent choice.
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Old 11-04-2012, 07:11 PM   #46
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Ah, magnesium. What that Mercedes was made of in the infamous grand prix crash that killed the record number of spectators and they couldn't stop the metal fire. Excellent choice.
Which is relevant to exactly nothing. Do you think there have been zero advancements made in materials science since 1955?
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Old 11-04-2012, 07:44 PM   #47
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This thread makes me want to cry.

I don't want to live on this planet.
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Old 11-05-2012, 11:31 AM   #48
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Next thing you know they will want to power vehicles by volitile and enegetic liquids stored in large vessels
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Old 11-05-2012, 06:56 PM   #49
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Next thing you know they will want to power vehicles by volitile and enegetic liquids stored in large vessels
Personally I think we'd all be safer with a boy carrying a red flag to alert others to our motorcar's presence. And disassemble the vehicle and hide it in a hedge upon seeing a horse so as to not startle the beast.
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Old 11-06-2012, 06:41 AM   #50
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The BMW's N52 engine uses a mag block (24% lighter than alu block). Haven't heard of any 330i's bursting into flames...
Ah BMWs most reliable motor!

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Which is relevant to exactly nothing. Do you think there have been zero advancements made in materials science since 1955?
Because natural laws are alterable at the whim of forum posters.
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