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[Wired] 3-D Printed Car Is as Strong as Steel, Half the Weight, and Nearing Production - Page 9

post #81 of 101
Jesus christ, why is it that "fuel efficient" never seems to be associated with "at least somewhat decent looking"?
 
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post #82 of 101
Most of the time diesel makes more powers with better fuel efficiency. 250tq while getting 40mpg vs 160tq getting 32mpg. I guess look at what diesel is doing for VW and there's your answer.
 
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post #83 of 101
Quote:
Originally Posted by marbleduck View Post

Jesus christ, why is it that "fuel efficient" never seems to be associated with "at least somewhat decent looking"?

You know the Ferrari LaFerrari and Porsche 918 are hybrids right? tongue.gif

People also seem to forget about the Fiska Karma, Tesla Roadster and Tesla Model S
Quote:
Originally Posted by /\/_|_\/\ View Post

Most of the time diesel makes more powers with better fuel efficiency. 250tq while getting 40mpg vs 160tq getting 32mpg. I guess look at what diesel is doing for VW and there's your answer.

With diesel you get all the power in one big lump, usually within 500 rpm. Petrol/gas is always going to be better for more power.

inb4 Audi winning Le Mans with a diesel.

That might be true, but the Audi got far more MPG than the petrol/gas cars which is why it won. If Audi put a petrol/gas engine in the R10, the petrol/gas R10 would be a lot quicker in shorter races.
    
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post #84 of 101
Quote:
Originally Posted by /\/_|_\/\ View Post

Most of the time diesel makes more powers with better fuel efficiency. 250tq while getting 40mpg vs 160tq getting 32mpg. I guess look at what diesel is doing for VW and there's your answer.

It has to do with burning temperatures. pv=knt, as temperature goes up pressure does as well. Since diesel burns hotter, you get higher temperatures per volume. This raises the pressure, causing (effectively) more force per unit burned. This allows diesel to have more power behind it, unfortunately due to how it burns it isn't as easy to deal with as gasoline would be. You require stronger engines as well as a different ignition method. Diesel cannot burn at the same temps as gas. A fun trick is to get some diesel and put out a match in it, most people would be afraid to do that however properly refined diesel won't burn at the temperatures a match does.

So essentially diesel has more potentional energy, the problem is getting at it. VW has put a lot of time and effort creating amazing diesel engines. BMW apparently does the same thing, some of these cars are pretty good on the torque. They have pros and cons but I won't get into that, mainly it's easier to get the power from a gas engine as apposed to a diesel.

[edit] ARRRR if I had waited!
Quote:
Originally Posted by andrews2547 View Post

You know the Ferrari LaFerrari and Porsche 918 are hybrids right? tongue.gif

People also seem to forget about the Fiska Karma, Tesla Roadster and Tesla Model S
With diesel you get all the power in one big lump, usually within 500 rpm. Petrol/gas is always going to be better for more power.

inb4 Audi winning Le Mans with a diesel.

That might be true, but the Audi got far more MPG than the petrol/gas cars which is why it won. If Audi put a petrol/gas engine in the R10, the petrol/gas R10 would be a lot quicker in shorter races.

I wouldn't say gas has more power, it is just quicker. Various reasons, I don't think either of us want to get into the why so... lol I do agree though, essentially diesel is more upfront although I think that is changing. Will it change enough to make a difference? Doubt it, other technologies are moving just as fast although a diesel hybrid would (IMO) be better than a gas one.
Edited by mushroomboy - 3/18/13 at 2:30pm
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post #85 of 101
Quote:
Originally Posted by andrews2547 View Post

You know the Ferrari LaFerrari and Porsche 918 are hybrids right? tongue.gif

People also seem to forget about the Fiska Karma, Tesla Roadster and Tesla Model S
With diesel you get all the power in one big lump, usually within 500 rpm. Petrol/gas is always going to be better for more power.

inb4 Audi winning Le Mans with a diesel.

That might be true, but the Audi got far more MPG than the petrol/gas cars which is why it won. If Audi put a petrol/gas engine in the R10, the petrol/gas R10 would be a lot quicker in shorter races.

But they're still not attractive cars..
 
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post #86 of 101
Quote:
Originally Posted by marbleduck View Post

Jesus christ, why is it that "fuel efficient" never seems to be associated with "at least somewhat decent looking"?

http://en.wikipedia.org/wiki/Drag_%28physics%29

Usually to be extremely efficient you have to sacrifice a lot of other things. Looks is an easy one and super low-drag designs don't look very nice.
    
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post #87 of 101
Quote:
Originally Posted by Trogdor View Post

Diesel engines are typically iron blocks, so they're heavier. Diesels are also more expensive than gasoline engines. Also, in my area diesel fuel is more expensive.

All in all using diesel is more expensive when considering how long the average person keeps their vehicle.

Congratulations on over simplifying something. You should look into WHY diesel is more expensive in your area.
Quote:
Originally Posted by Trogdor View Post

Great fuel mileage, but it's still heavier and more expensive. I also doubt they're going to use an engine with any more than 40 horsepower to propel this plastic death trap on three wheels.

No it's not. The engine he is talking about is an aluminum block with aluminum heads and specifically made smaller with only 3 cylinders to reduce weight while keeping good thermodynamics. Also, the article says they want a 10 HP engine so...
Quote:
Originally Posted by /\/_|_\/\ View Post

Most of the time diesel makes more powers with better fuel efficiency. 250tq while getting 40mpg vs 160tq getting 32mpg. I guess look at what diesel is doing for VW and there's your answer.

Peak torque is the most important value ever! RPM has nothing to do with anything...
Quote:
Originally Posted by DrBrogbo View Post

What? You can't 3-D print metal, only plastic.

Metal, when exposed to too much force, bends and warps, but retains some of its functionality. Plastic, on the other hand, cracks, shatters, and utterly gives way.

Seriously dude? Ever tried to shatter Tupperware? Or bend hardened steel? Plastic can be made to bend and warp and steel can be made so that it shatters instead of bending.
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post #88 of 101
Quote:
Originally Posted by DayoftheGreek View Post

http://en.wikipedia.org/wiki/Drag_%28physics%29

Usually to be extremely efficient you have to sacrifice a lot of other things. Looks is an easy one and super low-drag designs don't look very nice.

tesla-model-s.jpeg
tesla_model_s_official_4.jpg
Mercedes-Benz-CLA-Class_2014_800x600_wallpaper_01.jpg
Mercedes-Benz-CLA-Class_2014_800x600_wallpaper_3b.jpg

The most aerodynamic cars ever created. Your argument is invalid.

With the exception of Tesla cars, Fiska Karma, Porsche 918, Ferrari LaFerrari and probably a couple more, all hybrid/EV cars look like a wedge of cheese or terrible (such as the Nissan Leaf and Mitsubushi MiEV).
    
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post #89 of 101
To the diesel nay-sayers:
please google the BMW M550D X-drive.

it's the same basic 3.0L I-6 bottom end that BMW has been building since the late 60s/early 70s, with a few toys strapped to it (cough cough 3 turbos). is 380HP/550tq from a 3.0L not impressive?

to those that say you can't print metals:
http://en.wikipedia.org/wiki/Sintering

forging, eat your heart out.

As for plastics falling apart thanks to UV - they have this really cool stuff now called "UV stabilized plastic" - check it out.

As for Carbon Fiber (lets not forget it's really CFRP), that's old news. Carbo-Tanium is where it's at now:
http://en.wikipedia.org/wiki/Carbotanium
Doesn't shatter like CFRP, and it's all around a "better" material.

As for CFRP not being allowed in cars, the only groups I know of that dis-allow its use are Pro-Rally organizations, due to the shattery nature of CFRP - rally cars need to be able to take multiple hits in succession.

e.g.
https://www.youtube.com/watch?v=Fm-o2rEvxwU
 
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post #90 of 101
Quote:
Originally Posted by Bit_reaper View Post

Need a 66' hemi intake manifold. Just print the damn thing at your local printing shop biggrin.gif


That would be really really cool
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