A new kind of diesel THAT RUNS ON GASOLINE?

[80broncoman]

this could be some thing big, wonder if it will really work?.

From the article:

How do you make a diesel engine more efficient? One answer may surprise you: Run it on gasoline.

That's what researchers at Sweden's Lund University are doing, and they believe this combination could cut both fuel use and emissions in heavy-duty trucks.

Lund's experimental engine uses a different combustion process, called Partially Premixed Combustion (PPC), which researchers say could increase a large truck's fuel efficiency by 50 percent.........

Full article here:
http://autos.yahoo.com/news/gasoline-fu ... 05906.html

 

[xctasy]

Sabbs variable compression, and GM's SIDI, and Honda's semi separate Compound Vortex Controlled Combustion were examples of how close gasoline engines are to pre-chamber diesels.

The Aussies have been working on this technology too.

Its a shame Rudolph Diesels ammonium engine ideas, which is where diesel technology in Europe has headed, aren't introduced. Add-blue, which is just concentrated cattle effluent, is a pretty good anti detonation additive.

 

[arse_sidewards]

The old multifuel engines used in the M35 2.5ton truck used a special dish in the piston into which the fuel was injected. This enabled them to burn pretty much anything because the fuel remained liquid until the heat of combustion caused it to boil and then combust. By keeping any particular droplet fuel from atomizing and vaporizing until just it was to be burnt these engines were able to run fuels that would detonate and damage a normal diesel engine (gasoline). Ecoboost uses a similar system. IIRC so does Skyactiv. In a recent issue of some magazine I read about a Korean (IIRC Kia) gasoline engine that operates like a diesel. It also uses a special piston.

 

[Asa]

The old multifuel engines used in the M35 2.5ton truck used a special dish in the piston into which the fuel was injected. This enabled them to burn pretty much anything because the fuel remained liquid until the heat of combustion caused it to boil and then combust. By keeping any particular droplet fuel from atomizing and vaporizing until just it was to be burnt these engines were able to run fuels that would detonate and damage a normal diesel engine (gasoline). Ecoboost uses a similar system. IIRC so does Skyactiv. In a recent issue of some magazine I read about a Korean (IIRC Kia) gasoline engine that operates like a diesel. It also uses a special piston.

Dad was briefly the commander of a bunch of tanks and heavy trucks in the Marines around the end of the Viet Nam war. Somehow they got ahold of a couple hundred gallons of cheap perfume for fuel.

It got the job done, but his guys got a BUNCH of crap from the other jarheads about being the prettiest smelling Marines in the area

 

[arse_sidewards]

Dad was briefly the commander of a bunch of tanks and heavy trucks in the Marines around the end of the Viet Nam war. Somehow they got ahold of a couple hundred gallons of cheap perfume for fuel.

It got the job done, but his guys got a BUNCH of crap from the other jarheads about being the prettiest smelling Marines in the area

The locals probably didn't mind.

I wish I could find a multifuel engine for my truck. With all the crap I'd put through it the effective price of fuel would drop significantly.

 

[StrangeRanger]

Look up Sir Harry Riccardo's "Comet" stratified charge Diesel engine circa. 1948.
There is truly very little that is completely new under the sun

 

[CNC-Dude]

I like it when automakers today start bragging about the high mileage their cars are getting in their ad campaigns, and think that 40-50 miles a gallon is really something. In the early 80's, VW had that diesel pickup truck that got over 50 miles per gallon, and GM had that diesel Chevette that got over 40 miles per gallon. All of that was before they spent millions of dollars for high tech engine management systems that they have today. Like SR said, very little today is really anything that someone hasn't already been there and done that. However, some things are improved a little and some are not.

 

[80broncoman]

That Eccoboost engine has one thing that I don't think i have noticed on any other gas engine(besides the NASCAR engines) yet. it has the nozzles to spray oil to the under side of the pistons to keep from melting.
I'm really surprised that Ford priced the Eccoboost engine option so cheap. For all of its complexity. I was told Ford (and a few others) were working on direct injection gas engines back in 1993.

 

[motzingg]

lots of folks have been working on DI (direct injection) gas engines for years, the problem is load and fuel control hasn't been sophisticated enough, until recently, because of advancements in the cost and speed of computer processors, and improvements to the speed of the injectors themselves (which are pretty cool in and of themselves) plus its been really hard to get it to work well with emissions controls.

The SIDI (spark ignition direct injection) engines like 'ecoboost' or 'skyactiv' showed up commercially in mazda 3, uh, i think it was 2006 or something like that.

They inject fuel just before the spark event so the spark burns fuel in a stratified pocket. The air in a chamber adjacent to the spark plug has 13.5:1 (or something like that) AFR but the rest of the cylinder is very lean, so the pocket will burn, but the rest of the air doesn't. The key to it working is having the fuel/air mix close to 'stoichoimetric' so it will ignite.

They only work below a certain RPM at full load they switch over to a conventional fueling scheme.

Unlike diesel, it still relies on a spark to ignite and therefore requires a burn-able ratio adjacent to the sparkplug. Unlike compression igniton engines (like diesel) that can just jam whatever fuel they want in there.

obviously the cool thing is, because the fuel isn't in the cylinder until the very last second, they can run huge boost and high compression without detonating... which is what is giving them crazy performance numbers.

 

[80broncoman]

......

obviously the cool thing is, because the fuel isn't in the cylinder until the very last second, they can run huge boost and high compression without detonating... which is what is giving them crazy performance numbers.

Its going to real interesting when people really start to playing with em.

Wonder if any one has tried a standard N2O setup on one yet? They will be lucky if they don't blow the hood off.

 

[MechRick]

They inject fuel just before the spark event so the spark burns fuel in a stratified pocket. The air in a chamber adjacent to the spark plug has 13.5:1 (or something like that)

When it comes to direct injection and variable compression, I believe we are on the verge of some major innovations...

By retarding the intake cam we can create an engine that has a static compression of 16:1, but dynamic ratios wherever we want (the air charge gets pushed back into the intake runner before the intake valve closes). At this point, compression ignition gasoline engines are possible....

 

[motzingg]

well, yeah, i mean you get to a point where a piston can only take so much heat and a connecting rod can only take so much force.

metallurgy has gotten so much better since our sixes were designed in the 50's, its a brave new world inside these new motors.

what is awesome to me is that they have taken these obscure alloys and high tech processes and brought the cost down through economies of scale to be accessable for the average consumer.

i bet if you plotted the tensile strength vs weight of famous high performance race motors, the ecoboost and other modern engines would be right there with them. maybe even significantly better.

 

[CoupeBoy]

Well, this is interesting..

How Fiat MultiAir Technology Works
https://www.youtube.com/watch?v=Td9Gz_h7Qpg#t=24

Still not direct injected...