Posted on 01/16/2017 5:49:19 PM PST by Fai Mao
Homogeneous charge compression ignition, or HCCI, is the black art of of internal combustion engines that aims to produce diesel-like fuel efficiency for the cost of gasoline. Although some of its competitors have developed and subsequently given up on the tech, Mazda confirmed that the next-generation of SkyActiv engines will employ HCCI technology, improving fuel economy by 30 percent and at the same time reducing exhaust emissions.
(Excerpt) Read more at autoblog.com ...
The use of turbines in aviation was a result of its ability to burn more fuel and produce more power than recips.
The GE90 can produce up to 115000 lbs of thrust.
Whats the formula for converting pounds of thrust to HP?
22:1
The Duce has some features that allow it to run on other fuels, but not recommended for an extended period of time.
Later closing intake valves with more overlap and duration probably drop the actual dynamic compression much lower than the calculated mechanical compression values.
Why not just use laser spark plugs?
Oh, and yes they ARE real.
Good question I can’t remember this from college, but that was ancient history.
In a former life I flew B747-400’s, they produce 250000 lbs of thrust, more the a Mercury rocket. The hp equivalent would be a very large number.
P=F x d/t
IIRC the exhaust from that one could melt asphalt.
That's what it Boyle's down to...
ICWYDT
You have to solve predetonation issues with gasoline, and probably the same with diesel at higher pressures. On top of that the charge probably has to enter the cylinder at an extremely high value of homogeneity, i.e. no lean or overly rich locations throughout the charge.
1.3 * 30% = 39%
Only because they’ve engineered the hell out of it over the last 20 years to reduce sulfur, particulates and NOx.
90’s and prior you could run a diesel on home heating oil, now they’d probably mung up...
13:1 compression ratio on 87 gas is good stuff.
They’re spraying a fine fuel mist directly into the combustion chamber to keep it cool?
More details down in article pertinent to Mazda HCCI:
http://www.just-auto.com/analysis/briefing-hcci-engine-technology_id174273.aspx
I owned a midnight blue Oldsmobile 98 diesel. Luxury ride but it ate transmissions and finally the engine block.
“You can’t buy it yet.........
Then we should delete this thread?”
The article says it will be the standard engine of the Mazda 3 in 2018 model year so you can buy it this summer.
“Why not just go with a real diesel and try to maufacture them at a lower cost?”
Mazda hasn’t had much luck getting their diesel engines qualified for the USA market. The promised Mazda 6 diesel never happened outside of Australia and a few other markets. Remember VW had to cheat to get past diesel emissions requirements.
I think VW developed the Wankel (rotary) engine.
No, the Nips just copied an existing German automobile engine. The NSU Ro-80 revolutionized engine technology in 1967.
Mazda bought the patent to the Wankel engine, whch was featured in NSU's Ro80 sedan and their sports car, the Mazda Cosmo.
https://en.wikipedia.org/wiki/Mazda_Cosmo
Poor fuel economy, poor emissions and those leaking seals were a problem.
I have a 1967 NSU Ro80 sales brochure—long-stored in a fire safe... :)
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