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The Volt's gasoline capacity is being cut back

The Chevy Volt plug-in electric car from GM is one of the most desired new cars coming to the market.  Everyone is talking about the car's stylish design and relatively affordable price tag of around $40,000; not bad compared to past electric cars totaling over $100,000 like the Tesla Roadster.  With sales planned to commence in 2010 and with a production model possibly being unveiled later this year, the buzz surrounding the new vehicle is intense.

One fact many people didn't know is that while the Volt is an electric car, relying first on charge, it also sports hybrid capabilities.  It features a 12 gallon gas tank, which will only kick in after the lithium-ion battery charge is depleted.  This could take the car 600 miles, thanks to an impressive 50 MPG projected fuel economy.

However, recent reports have revealed that GM, in a surprising development, has decided to cut down the fuel tank for the Volt.  They won't say what the new capacity will be, with the source only saying, "We're working on that." 

The original goal for the Volt was to equip it to drive 40 miles on a charge, without using any gas.  This goal remains, and appears to be within GM's reach.  Additionally, since 40 miles isn't long enough for road trips or longer business travels, GM planned on adding the gas tank.  The gas does not power a traditional engine, but rather a generator, which provides enough charge to keep going, and actually performs more efficiently than most gas-engines.

GM has revised the target range to 360 miles, which would seem to indicate a fuel tank of 7.2 gallons.  The reasoning behind the cut is research that cars, on average, travel less than 40 miles a day.  While GM wants to provide a comfortable extension to this range, it decided that 600 miles was a bit excessive.  Many older sedans don't get much more than 300 miles on a 12 gallon tank, so the new range seems relatively reasonable.

Jim Hossack, vice president of AutoPacific, an automotive research and consulting firm states, "Most cars today have a range of more than 300 miles and less than 400 miles before refueling.  GM didn't need a longer range because most bladders can't go 600 miles.  By going with a smaller tank it means GM can take weight and price out and make Volt a little lighter and a little cheaper, and that's what you call making an improvement."

While GM's move should help it cut costs and cut down slightly on the weight of the vehicle, it may come as a disappointment for fans of ultra-long treks across the country.  Still, it is dubious that such minor gripes will be able to do anything to quell the PR frenzy surrounding the Volt.

At its price tag, even with possible subsidies, the Volt will likely fall into the luxury car class.  However, with its wild popularity and sleek looks, it seems likely to thrive in this class, or whatever class it may enter as prices drop.



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RE: Hybrid
By randomly on 7/9/2008 10:11:51 PM , Rating: 3
Yes I'm fully aware of the Carnot cycle limitations on heat engines.

Do a little research on Serial hybrid systems for cargo ships. They are low speed diesel combine cycle systems and efficiencies do reach %56. These are not theoretical systems either but systems currently in use. Not really surprising considering fixed combine cycle power plants have efficiencies up to 60%.

I would never suggest that GM vehicles were even remotely perfect. But GM engineers are not stupid and serial hybrid technology has some significant advantages. This is why many other car companies are pursuing it including BMW, Mercedes Benz, Toyota, etc. Maybe they know something you don't?

Your reasoning that a 100hp gasoline engine driving a 100hp generator driving a 100hp electric motor means you have 300hp worth of power available is goofy. You obviously aren't an engineer. If it upsets you so much just put the generator and the electric motor in a black box and rename it TRANSMISSION and be happy.


RE: Hybrid
By pauldovi on 7/10/2008 11:30:21 AM , Rating: 2
Just because a company does something does not mean it is the best way to go about it. Having an vehicle that is an "electric" vehicle may have implications beyond the mechanical advantages, such as tax advantages and appealing to the "green" side of people.

I never said 300HP was available. But 300HP worth of engines is onboard. Meaning you are paying for 300HP worth of engines, carrying around 300HP worth of engines, but only driving the car's wheels with 100HP. That seems pretty silly to me.

I do not rebuttle personal comments so I will not respond to that.


RE: Hybrid
By Jim28 on 7/10/2008 10:59:58 PM , Rating: 2
You still don't get it.
The drive engine is 120Kw, the ICE/generator combo outputs 53Kw.

Obviously the drive engine can't deliver peak power on the ICE/gen alone but it is more than enough to drive the car BY Itself as peak power is only needed when you put your foot to the floor.
When that happens the motor pulls additional current from the battery pack. The car does not wait for the battery to be completely depleted to start the ICE/gen so that it has a little punch left.
In normal driving the drive engine may need say 40Kw to run the car, the extra 13Kw the ICE/gennie outputs is used to charge the battery and overcome the 10-12% conversion losses.(guessing here but it should be in the ballpark.). See! Energy is conserved, the Thermo gods are happy!
In engineering terms this type of power plant is called a turboelectric drive. (At least on ships and ships don't use batteries.)


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