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50% Efficiency Boost From New Fuel Injection System
chudnall notes a Technology Review story on a new gas engine injection system that promises increased efficiency of up to 50%. "The key is heating and pressurizing gasoline before injecting it into the combustion chamber, says Mike Rocke, Transonic's vice president of business development. This puts it into a supercritical state that allows for very fast and clean combustion, which in turn decreases the amount of fuel needed to propel a vehicle. The company also treats the gasoline with a catalyst that 'activates' it, partially oxidizing it to enhance combustion."
It is a diesel.
When is the two-cycle version coming out?
Warning: this article may contain humor, sarcasm, parody, and perhaps even irony. Read at your own risk.
I hate "up to". Anything that claims an improvement of "up to" something is a essentially misleading. You won't get a real world improvement anywhere close.
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That's almost a full US Gallon. You could drive 100km on a jug of milk.... Well if you could run a car on milk. That would give new meaning to milking it for all it's worth.
Same snake oil that was being pitched at county fairs in the 1970s. Nothing to see here, please move along.
Well, I don't understand how their scam is supposed to work if you're right. From the article
The company has demonstrated the technology in its own test engine, and says it is currently testing it with three automakers. One key question is the impact the high pressures and temperatures will have on how long the engine lasts, Rocke says. The company, which is supported by venture-capital investments from Venrock and Khosla Ventures, plans to manufacture its system itself, rather than licensing the technology. It plans to build its first factory in 2013, and to introduce the technology into production cars by 2014.
So pretty much I just have to sit back and wait for the major automakers to offer these cars? Sounds like the fresh country rube is insulated from the snake oil salesman by the car manufacturers who apparently are prepared to buy into it. On top of that, it looks like they're not looking to license this technology to these companies but instead build a plant to manufacture them. So, they're at quite a bit of risk and are probably pretty interested in seeing this thing through if they want a piece of the manufacturing action. If you're selling snake oil, you usually just want to be selling it and not heavily invested in it.
If you have a citation of high pressure transonic combustion in the 1970s, I'd love to read about it.
My work here is dung.
Actually, by the end of TFA (which I'll assume _you_ have read before making a RTFA demand of others) they get even more generous with the claims, and say it gets 98 MPG at 50 mph. (I.e., in a range where, sorry, but it's not _that_ aerodynamic.) I.e., basically 2.4l per 100 km on the highway.
I'm sceptical of anything which proposes to simply double the amount of energy extracted from that gasoline, because, well, physics is physics. The efficiency of the cycle is capped the hard way by the max and ambient temperature difference, and short of inventing an engine which runs at thousands of degrees, the alternative would be that conventional engines were spewing out half the gas unburned. Which just isn't the case.
A polar bear is a cartesian bear after a coordinate transform.
No, they REPORT that they get 64 miles/gallon. Who verified this? Lots of startups make outrageous claims to suck in investors. Is this under optimal conditions? In the lab, the Prius gets amazing mileage too. How heavy is their prototype? That's one funky, aerodynamic looking car... why not use a standard automobile... you know, something that might actually be driven by you on your way to work.
Oh, but I'm sure when the technology never quite makes it to market, die hard conspiracy nuts will claim some Oil company bought the technology only to destroy it so they can sell more oil.
The age where the country rube was the only mark of the snake oil salesmen... well, probably never even existed. A lot of snake oil is sold to the investor who wants to pay for that manufacturing, or subsidize the research or whatever. See the Phantom console, or several cars supposed to run on water or even urine, etc. And it's not even a new thing. If you go back as far as the middle ages or even antiquity, you'll find the likes of the alchemist who sold the promise of endless gold or eternal youth to whoever just invests in his research, or mis-haps like the South Sea Bubble where you were supposed to get endless riches if you just invest in someone's expedition there.
Basically "but they plan to built it" is no reassurance and never was. It can simply mean they have a rube with deeper pockets in mind.
A polar bear is a cartesian bear after a coordinate transform.
People keep saying this is a diesel engine, but it is not. In a diesel engine, the air in the chamber is heated by compresssion up to something hot enough to ignite the fuel. In this design they are heating the fuel and pressurizing it before they inject it into the chamber, so that it turns to vapor as soon as it is injected into the chamber. Someone seemed to be making fun of the term 'supercritical' but that is the word for vapor that has completely transformed from a liquid and has excess internal energy. This is very different from spraying the gas with an atomizer.
Does the exhaust also smell like bullshit?
It's been known for a long time that engines will run very efficiently if you run them very lean. In TFA, you will see that's what these guys are doing. The problem is that the engine then runs very hot, and the thing wears out in short order, or you have to make it out of unobtanium. They are also using unusually high pressures and temperatures. In the fine print, you will see they still have some work to do on verifying that the engines will last very long under this treatment.
So, yes, it will get great miles/gallon, but probably not very many miles/engine.
Computers obey me.
Fuel injection wasn't very widespread in the 1970s. The snake oil then was a carburator, not fuel injector. I knew a mechanic who actually got hold of the plans and built one; it increased his gasoline mileage slightly (it was supposed to triple it), but the car performed like a dog. It did NOT actually increase efficiency.
If an engine's efficiency is increased, not only will you get better mileage but better performance as well, although you can increase mileage without increasing efficiency (back in the old days it simply took a smaller carburator). There have been a LOT of engineering enhancements since the '70s. I had a '74 Pontiac with a four barrel carb, dual exhaust, milled heads on a 350 CI V8, it got 19 mpg tops on the highway (stick shift). That car was fast, would burn rubber in all gears. The car I'm driving now is an '02 Concorde. It's as roomy as the Pontiac, nearly as fast (automatic tranny, will burn rubber without a clutch to dump), but has a far smaller V6. At 50 mph I get 35 mpg, 28-30 at 68 mph (that's 100 kph for those of you in more civilized parts of the world; 1 km = .6 m iirc), and gets up to 20 mpg in the city, depending on traffic lights, etc.
THAT'S increased efficiencey. Today's automotive engineers are awesome.
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Stop being so cynical! It's clear to me and other freethinkers that this invention, coupled with Roger's Patent Home Fusion Contraptor, the Bloom device, and the Smithe Perpetual Motion Machine will lead us to energy independence! Free renewable power for one and all!
No no they don't propose using a different oil ... just preprocessing the gasoline ... I mean, who can imagine a car running one snake oil? How many snakes to the mile would that take?
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This article describes a very similar process from a New York company that uses supercritical diesel fuel -- and they report much more sensible efficiency gains of up to 10%. They've only tested in a lab setting so far though.
I found the article because I was looking for the supercritical points of gasoline, which is a complex mixture of many different hydrocarbons, making the critical points very tricky to estimate. Turns out they are 720K and 60Mpa, from the article above. Their system achieves temperatures this high (almost 400 degrees higher than normal fuel system operations) using exhaust heat. Given that higher temperatures mean improved efficiency, I'd buy the 10% they propose -- though I remain very skeptical abut the 50% proposed in this article.
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Bah, the technology is fine. They put it in our cop cars and they work fine. Good thing too, since I'm just a few days from retirement and I've got this new partner. Nope, no explosions here.
SJW: Someone who has run out of real oppression, and has to fake it.
On top of that, it looks like they're not looking to license this technology to these companies but instead build a plant to manufacture them.
That alone should be a red flag, for several reasons.
1) They are an engine technology company, not a manufacturer. How much experience to they have in mass production, supply-chain management, etc? Not a small learning curve.
2) Tooling costs are high, increasing their capital needs, which is a convenient way of pulling more money out of their investors and therefore creating more opportunities to skim.
3) By manufacturing themselves they don't have to reveal the "secret secret", just the "secret". Any attempt to independently verify their claims will be made vastly more difficult by not having a full and public disclosure of their trade secrets in patent documents or under NDA to a licensed manufacture. So this approach puts off the day of reckoning for a good long while, and during that time company insiders can happily pay themselves big fat bonuses. It will also be much harder to prove they were lying about the technology's potential when the house of cards falls.
An engine technology company that's going to manufacture rather than license? Sounds too good to be true. Because it probably is.
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As any (mechanical) engineer knows, to get an efficient internal combustion engine you want compression pressures as high as possible and combustion temperatures as high as possible (an oversimplification, to be sure) because an internal combustion engine is a heat engine, and the greater the temperature and pressure difference between the combustion event in the cylinder, and ambient conditions at the end of the exhaust system, the more efficient it is.
UNFORTUNATELY, some three quarters of the gas that the internal combustion engine draws in from the atmosphere is Nitrogen, and when you expose Nitrogen to the high pressures and temperatures of a combustion chamber, what happens next is simple, and unavoidable, chemistry, you get oxides of nitrogen out the exhaust pipe.
So on the one hand an efficient engine will be running petrol / gasoline at 13:1 compression ratios, or diesel at 25:1 compression ratios, and polluting the crap out of everything.
On the other hand, a "green" engine will be running petrol / gasoline at 9:1 compression ratios, or diesel at 17:1, and wasting energy efficiency like an ice rink in Dubai.
You can't have it both ways.
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