JimS

Member
What do you think of this?
"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."

http://www.autoblog.com/2017/01/16/mazda-skyactiv-engines-hcci-2018/
http://www.autoblog.com/2017/01/16/mazda skyactiv engines hcci 2018/
 
Chevy was working on the same thing when GM went bankrupt. Not sure if all the complexity will be worth the bother. No matter what they do with a gas engine, diesel fuel will always have more energy per gallon.
 
Didn't they put that thing in an Oldsmobile in about the early to mid 80s? It wasn't the Omega,but there was some other short lived model.
 
The concept is interesting, as always would like to see it out there for a couple of years before buying.
 
All diesel engines will be compliant to stage 5, that includes diesels now exempt, under 25 hp. Do you think this my be solution for small engines to be compliant or will they just use fuel injection gas engines?
 
Mark,
half century ago college physics, equation for thermal efficiency was bases on the hottest and coldest temp. Increasing compression, increases temp. So next step for more efficiency is more compression, which means compressing the nitrogen in the air. OH, NOx problem! What do you think?
geo
 
Amen to that JD. GM tried it several years back but they found, if I'm not mistaken, the fuel economy increases were best in cruise mode and that it wasn't much of an increase. Everything I read points to more turbocharging and gasoline direct injection.
 
No compression-ignition engines running on gasoline in the 80s. Oldsmobile took a gas engine format and converted it to a conventional IDI diesel in the late 70s. So did Isuzu, so did Datsun, so did VW. In a way, it seems even the .9 and 7.3 International-Harvester diesel used in Ford trucks got it's early start as a 7.3 gas engine in school buses. The MV-446.
 
It does not matter one bit how much "better" diesel is. Someone does NOT want diesel cars and pickup trucks becoming common in the USA.

Is it the transport industry trying to keep fuel costs in check? Is it big oil trying to maintain a market for gasoline? Is it someone in the EPA with a chip on their shoulder? Who knows, but it sure seems like there is a concerted effort to sour public opinion on diesel engines.
 
What was that gas engine that didn't have spark plugs? A guy just north of town worked at Olds in Lansing all of his working life. After he retired,he bought his wife a new Olds. It was a gas with no plugs. I don't remember the model though. I don't think it was an Aurora either. Quite a small car for it's time,but a lot more streamlined than an Omega.
 
You've got me stumped. I never heard of such a thing. Back then - seems to me - a gas engine either had to have an spark ignition system, or at least a glow-element like in the old hot-bulb engines. I have never yet heard of a compression-ignition gasoline engine anywhere that has been sold to the general public. Honda, Hyundai, GM, and a few others have experimental versions.
 
Maybe it had a glow element or some such thing,but I remember he made a big deal out of it not having plugs.
 
Gas engines are rapidly approaching the economies of Diesel, with less problems meeting emissions.

IMHO GM killed the Diesel in the 70s, most people also do not like the smell of filling Diesel vehicles.
 
i think it will be way too complicated. Current engines are overly complicated now as it is.

i see the article mentions the push for electrification (electric cars). don't see that happening and the power plants that supply them polute too. plus all the inefficiencies of the power plants and line transmission and the electric motors in the cars, however, they do regenerate on braking.
 
I really think hybrid cars are the way for commuters, the dynamic braking recovers so much energy.

Maybe a small Diesel in them.
 
I think that's a good share of it. I remember when the school superintendent bought a new Olds diesel. He stopped for fuel on his way to church and got a little bit on him. He stunk up the whole church. That was about the end of his diesel driving days.
I think the last straw was when he ran through some standing water and sucked some in the intake. He bent a few rods with that incident.
 
On our visits to North America on vacation, my friends and I have always commented on the fact that so many gas stations
had only 1diesel pump. Here in Europe, every filling station has the same number of diesel and gas. Many stations also
stock propane, as this is getting popular as road fuel. Gas and diesel cars are about 5050 in use,I don't know of any
gasoline powered vans or trucks over 2000pounds payload.
 
Has the auto industry given up on Smokey Yunick's "adabiadectic engine"? I believe it was spark ignition with ceramic or ceramic coated moving parts and no cooling that we would recognize. I believe he may have had 3 different running models at one time before he died. Expensive engine parts, but xlnt fuel economy and improved power output.
 

Diesel always burns dirtier because it's a longer and heavier hydro carbon.
Diesel will always have problems gelling fuel filters.
Diesels will always require intake manifold heaters or glow plugs.
Diesels will always require particulate filters, particulate filter burn off, cooled egr, 20,000psi injection system and urea injection.
Diesel from 2007 to past year cost more per btu than gasoline .
The diesel option makes vehicles and equipment more expensive to purchase.
Ever heard tell of the cost of a set of common rail injectors after the warrenty expires ?
 
(quoted from post at 11:00:46 01/17/17) What was that gas engine that didn't have spark plugs? A guy just north of town worked at Olds in Lansing all of his working life. After he retired,he bought his wife a new Olds. It was a gas with no plugs. I don't remember the model though. I don't think it was an Aurora either. Quite a small car for it's time,but a lot more streamlined than an Omega.

No such beast. The plugs were there but hidden Underneath the individual coils and valve cover. Thankfully the pesky distributer on the spark ignition engine is just about a thing of the past.
 

That was in the bad old days before 2007 and ultra low sulphur diesel. Now diesel and gasoline smell rather tame, similar to jet A-1 or kerosene for those small portable heaters.
 
If we are to reach the fuel economy standards as required in the near future, we are going to need some rather revolutionary advances in the internal combustion engine. I had read elsewhere on the HCCI, and that it was something in the works. Nearly 2 years ago I was looking at possibly buying a new car. I decided I was going for a mid-size sedan and I tried out numerous makes and models, most of those were not brands I would have considered even trying. That mid-size segment is the most heavily competitive area in the automobile market today. Of those models I looked at, they were all within about $3000 in price. Equipped with 4 cylinder engines, they were all rated about 38 mpg on the highway. We have come a long ways in improved fuel economy, but there still is a ways to go. Will THE solution be the HCCI engine? Not sure about that. It might provide one of the solutions. I am excited about the potential for the gasoline engines in our near future and the fuel efficiency they might bring. I am hopeful we can have less complications on our diesel engines for smog control and perhaps clean them up like I feel we have gone with gasoline engines.
 

There is no way raise thermal efficiency into 50% range without high cost, complexity , secondary heat reclaimatiom and efficiency of large scale installations. The carnot cycle used in the Otto reciprocating engine's Rankine thermal process can only go so far.
To obtain fuel efficiency in that range, how is thermal efficiency going to be raised from the high 30% range into the 60% levels?
There are no appreciable reductions in rolling friction, aerodynamic drag , parasitic loads or weight reduction to reduce inertia.
 
buick,
I could only wish my 2007 GMC V6 didn't have that pesky troublesome distributor
I replace about every two years like clock work.

I will NEVER buy anything new in the future with a distributor. NEVER, NEVER,
NEVER AGAIN.
 

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