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 ...
“Diesel is cheaper one cost per mile basis.........”
Not compared to this HCCI.
You can’t buy it yet.........
yep, on a really bad day you might shoot a piston out the bottom of your engine or completely blow a cylinder.
That would be pretty much a write off of the engine.
When you run high compression or a supercharger/turbocharger you are flirting with detonation in order to get maximum performance of every cubic inch of the engine.
Detonation in a high out put engine usually ends up bad.
Had an RX3 wagon in the mid 70’s. MPGs sucked but that thing went like a scalded dog.
At higher speeds it always felt like the back end was trying to lift off the ground.
Didn’t keep it long enough ( traded it in on a pinto wagon ) to have the seals explode on me.
“You can’t buy it yet.........”
Then we should delete this thread?
No, it’s about upcoming technology. .....
A guy named Rudolf Diesel came up with that idea and patented it in 1895 https://www.google.com/patents/US542846. Of course, he was too much competition to the growing internal combustion engine folks, so he was taken care of in 1913.
No, the Nips just copied an existing German automobile engine. The NSU Ro-80 revolutionized engine technology in 1967.
My wife and I bought a Mazda 3 this past summer. The little 2.0 liter engine is peppy and fun. The car regularly gets 40mpg back and forth to work during the summer and 36-38 during the winter months using 87 Octane fuel. The secret is that they inject the fuel after the compression cycle is complete, so there is no detonation.
The only thing you have to really worry about is the grade of the fuel — you should use Tier 1 fuel or risk clogged injectors.
I had a 1970 Ford,429cui. Compression ratio of 10 1/2 to 1.
It would get pre-ignition at idle on reg gas.
How they run an engine w/ 11—12—15 to 1 on gasoline is waaaay above my pay grade
Wankel II?
Chrysler developed a turbine engine during the 1950s. It was generally successful but offered only a slight gain in power at a cost of mileage.
The engineering was not lost as the engine was used in the M1 Abrams tank. Different companies make it but it was originally Chrysler.
What you did there, I see it . . .
Supposedly Audi went the other way with the block for the 2.7 twin turbo in the early 2000s S4, gas engine, diesel block. There were guys out there getting insane power out of those things.
A 30% improvement in efficiency would make the engine what, 70% efficient?
*****************
25%*1.3=32.5%
CGI Block... Compacted Graphite Iron is the material if my memory is correct. Many are using it, Ferrari, Ford, it can handle boost and they can thin-wall it and have respectable weight.
I’m skeptical. Remember the Mazda Wankel? It was a flop
***************
Yeah , it’s only been around from the late 1960’s til today... but it is terribly inefficient compared to piston engines and the apex seals are problematic.
Not sure exactly how, but the Deuce and a half truck can run gasoline. I always assumed it was absurdly high compression.
ping
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.