2018 Detroit Auto Show: Achates, Aramco Launch 37-MPG Pickup Engine

Trucks.com ^ | 01/15/2018 | John O'Dell

[taildragger]

Note, this is the compression ignition version running gasoline. Wrap your head around that one!

[taildragger]

Apparently they are way beyond paper or vaporware here, production intent (IMHO) prototype in the dyno...

[taildragger]

IF you are not familiar with the concept this is a Junkers ( aircraft ) type engine, i.e. two crankshafts with 2 pistons sharing a common bore and total elimination of the valve train. Externally scavenged ( source of air for the "intake" ) via a "Roots" type Supercharger / Blower.

[taildragger]

Red, Diesel engine ping list please, their are diesel versions in the works as well 1000hp Military version!

[ConservativeMind]

Ping.

[FreedomPoster]

Compression ignition ping.

[Vaquero]

I am extremely impressed with my 2014 Ram. I regularly get 21 mpg on the highway with this 400 HP V8. It’s the multi displacement I suppose.

I love the power when I need it. And not smoke and mirror high reving low torque tiny engine kind.

[Beagle8U]

“will deliver 37 mpg fuel economy without hurting truck’s working capabilities.”

Yeah, as long as it is ‘working’ to deliver no more than a box of feathers.

[taildragger]

Have you researched the Junkers engines and what they powered? Large aircraft, DC-3 class, way ahead of their time, it takes torque to fly a prop plane that big. Roots Blowers = Low End Torque, which this engine uses for an air supply. I’d love to see a torque curve on this puppy, long, and flat as Kansas, but gobs of it, is my guess...

[Beagle8U]

No, I don’t know anything about them.

[Paladin2]

Opposed pistons sounds very negative.

I suppose they are opposed to everything along with each other.

[Bryanw92]

>>Red, Diesel engine ping list please, their are diesel versions in the works as well 1000hp Military version!

One of the submarines I served on had a diesel generator engine in this configuration. 5 cylinders and 10 pistons.

[Bryanw92]

>>Yeah, as long as it is ‘working’ to deliver no more than a box of feathers.

The article says 429 lb-ft of torque.

[taildragger]

"The article says 429 lb-ft of torque."

Years ago I read somewhere an engine guy of note said Torque is a way to gage how efficient the air pump is, since an ICE is an air pump. 270 hp maybe 300 lbs of torque, but 429, makes this in a class of it's own. I wonder if the lack of a valvetrain and all its' friction drag is adding to the torque. Also I believe this style of engine has greater thermal efficiency, given 2 pistons are using one cylinder, that heat is staying their and utilized, not each individual one needing to be cooled.

[Neoliberalnot]

I’m wondering the same. I have a 2012 F250 with the 360 hp V8 and I sometimes pull near 10 tons on a machinery trailer. It ain’t easy going up steep hills but it gets the job done.

[OKSooner]

Okay... thanks for the graphic. You really think this might make it to production vehicles like say, the F-150? In a couple of year, really?

I assume the manufacturers would acquire license to develop and build their own proprietary versions? Or maybe not?

[iontheball]

It doesn’t much look like an Atkinson design to me, no valves. Wow, opposing pistons, timed to compliment each other in the combustion cycle and operating in a single cylinder. Now why didn’t I think of that?

[Beagle8U]

“The article says 429 lb-ft of torque.”

Put that into layman’s terms. Will it pull a 3 bottom plow through cement?

[WeWaWes]

Two stroke? Will it sound like an old motor boat, or lawn mower? I bet it has a unique loud sound that they wrestle with regarding noise. A boxer engine is also notorious for vibration.