One of the most exciting new types of internal combustion engines is the opposedpiston opposedcylinder engine, and if you cant remember all those tonguetwisting syllables you can just call it an opoc engine. In the sixties i was 15 months as 2nd engineer on a ship with a doxford engine. They are the highly stable engines and deliver higher efficiency. Essentially, theyre going to do develop an advanced engine which could power a number of military vehicles. One of the most exciting new types of internal combustion engines is the opposed piston opposed cylinder engine, and if you cant remember all those tonguetwisting syllables you can just call it an opoc engine.
Patpoc like opoc and patportless engines the technical. Each of the cylinders of the engine has two pistons, one at each end. An engine cylinder is just what it sounds like a cylindrical hole in the engine into which you can place a moveable tube, called a piston. The fuel system was designed for 1800 bar maximum fuel pressure with two injectors mounted diametrically opposed in each cylinder. Check out jalopnik right here for a video demonstration. However, the ability to pull more power out of each pound of engine made the opposed piston engine a natural fit for highperformance propellerdriven airplanes, especially the fighter jets of world war ii. Achates highly efficient opposed piston engine is set to find a home in the ford. Two stroke engines are favorites of everyone who wants a really compact engine with lots of power, there are. Cummins is developing with achates power, an opposedpiston engine its supercharged, turbocharged, 3 cylinder diesel. Opposed piston diesel engines are crazy efficient youtube. The opoc engine runs with almost two times the engine speed 3800 rpm along with a large cylinder stroke 167.
Coldstart whtc and whsc testing results on multicylinder. Peter hofbauer chairman, chief technology officer and inventor of the opoc engine. It consists of two cylinders with a piston at both ends. Most cars use a fourstroke or otto cycle engine, in which there are four stages to the piston s motion.
Throughout the 20th century, when the utmost fuel, weight and volume efficiencies were required to propel aircraft, ships and vehicles, an unconventional type of compression ignition engine was used. An opposed cylinder uses a second piston pressing in to oppose the piston pushing out, doubling the compression for a given stroke length. Research has shown twostroke opposed piston engines to be wildly efficient. The opoc engine is an opposed piston opposed cylinder, 2stroke engine. In the first, called the intake stroke, the intake valve opens and the piston moves downward. Apr 11, 20 ecomotors opposedpiston engine to be built in china antony ingram april 11, 20 comment now. The opoc engine is a type of internal combustion engine. Two sets of ports extending entirely around the cylinder bore are located so that one set is read more. Heres a new take on engine design that may be as revolutionart as the wankel rotary. Ecomotors opposed piston opposed cylinder 2 stroke engine.
Single cylinder, single crankshaft, full balanced vibration free, with builtin scavenging pump, four stroke like lubrication and some 35% additional time for the injection and the combustion of. Ecomotors opposedpiston engine to be built in china antony ingram april 11, 20 comment now. Patpoc like opoc and patportless engines posted in the technical forum. Together, theyre going to work on an opposedpiston twostroke single cylinder advanced combat engine technology demonstrator. Achates power opposedpiston engine cost comparison initial results on a new lightduty 2. Opres unconventional geometry its crankshaft is disposed between the wrist pin and the combustion chamber while the wrist pin of conventional is disposed between the crankshaft and the combustion chamber shifts the combustion to the slow dead center. The opposed piston engine has several inherent advantages over conventional fourstroke engines, like higher bte 1530% higher, higher power density, an airsystem that results in reduced pumping work, the ability to control residual combustion gases, two fuel injectors per cylinder providing greater timing flexibility, and the ability to. The ignition of fuel and air creates an explosion that drives the. Courtesy of the sterling engine company, buffalo, new york. They address individual opposed piston engine makers, the history of this engine type, and relate some of the advantages and disadvantages of using opposed pistons. Fuel injection system for opposedpiston gasoline compression. Called the tardec, it has facing pistons and moving cylinders. Instead of an i or a v pattern, ems opoc is laid out like a twocylinder boxer engine.
Opposed piston diesel engines are crazy efficient video. Nothing says the opposed piston engine needs two pistons of equal stroke, at the limit of short stroke for the second crank, it can be functioning mainly as a valve mechanism, less as a power piston still power there, though. Achates bets opposedpiston engine on trucking horizon. This is just a regular engine with pistons on the outside. If you would like to participate, you can visit the project page, where you can join the project andor contribute to the discussion. Downloaded from sae international by eric dion, sunday, june 22, 2014.
This 6 cylinder 12 piston layout displaced a whopping 1,200 cubic inches 19 liters, was more physically compact than less powerful engines of the time and was configured to run on a variety of fuels other than diesel in its role as the powerplant for the chieftain main battle tank. Opposed piston opposed cylinder and with in perfect balance. The opposedpiston engine has several inherent advantages over conventional fourstroke engines, like higher bte 1530% higher, higher power density, an airsystem that results in reduced pumping work, the ability to control residual combustion gases, two fuel injectors per cylinder providing greater timing flexibility, and the ability to. Pistons slide neatly up and down in the cylinder because thats what theyre designed to do. Two fuel rails were mounted on each side of the engine and were supplied independently from two crankdriven unit pumps mounted at the front of the engine. Operating on the twostroke cycle, the inwardly opposed piston engine offers reliability and efficiency of a breatheeasy piston port design. As the opposedpiston relative dynamic characteristics of opposedpiston twostroke engine depend on different design and operating parameters including the opposedpiston motion phase difference and crankconnecting rod ratio, a numerical simulation program was built using matlabsimulink to define opposedpiston motion profiles based on. Historically, the opposedpiston engine set combined records for fuel efficiency and power density that have yet to be met by any other engine type. Dear colleagues, howwhere can i find the free version of ees to download in my pc. Achates power debuts gasoline opposedpiston engine in a. Jul 22, 2018 opposed piston diesel engines are crazy efficient efficient engine,engines,achates power,opposed piston engines,two stroke engines,diesel,diesel engine,3 cylinder,turbocharged,supercharged,supercharger,turbocharger,two stroke,twostroke diesel,new engine,ford f150,engineering explained im gegensatz kolbendieselmotoren sind verruckt effiziente.
When wwi ends, they resumed work on the four cylinder engine, and after further research and the completion of successful trials, it was felt justified in putting this into production. Opposed piston engine is a type of diesel engine which has two pistons working in the same cylinder. Ok we are all familiar with the current most popular design for an engine which also called the otto engine since the basic principle was designed by nikolaus otto in 1876 as a stationary single piston engine from which all modern engines derive its basic design principles. What possible benefit is there to have two pistons accelerate towards each other rather than a single piston moving towards the cylinder head. Later on, i was 9 month chief engineer on another ship, with a 6. Achates power is bringing back the opposed piston layout to make gas power more efficient. Achates wants to chuck that out the window in favor of the opposed piston engine. Aftermarket cylinder heads why you shouldnt just bolt them on part 2 trrc vortecpro duration. Find out information about opposed cylinder engine. Achates opposed piston engine could revive pull more power from less fuel wired how a 70yearold idea.
Every time the pistons come together a power stroke occurs, forcing both pistons away from one another and rotating their respective crankshafts. This engine see part a of the figure has two pistons moving in opposite directions in the same cylinder. Nevertheless, several very successful opposed piston engines, both of the fourstroke and twostroke type, have been and still are being produced for stationary, marine, automobile and aircraft duties. Introduction what is an opposedpiston engine in opposedpiston engines op pistons are arranged in such a way that two pistons are reciprocating opposite to each other, both working in one cylinder. How opposed piston opposed cylinder opoc engines work. Achates power debuts gasoline opposed piston engine in a lightduty truck at 2018 naias the truck features an op gci engine that will exceed cafe 2025 requirements. Achates power opposedpiston engine animation youtube. Opposedcylinder engine article about opposedcylinder. General view of sterling crankless opposed piston diesel engine, twocycle, solidinjection, four cylinder, 3 by 4 inches.
The fundamental thermal efficiency benefits of this engine type along with its low emissions, small package size and weight, and low cost relative to current engines make it an. Two stroke engines are favorites of everyone who wants a really compact engine with lots of power, there are fewer parts and power delivery on every stroke. Another is the ecomotors international em opoc engine, aka open piston, opposed cylinder. Achates opposed piston engine could revive pull more. Groundbreaking engine technology appears fairly frequently, but few designs ever make it beyond the. Practical applications of opposedpiston engine technology to. This week it was granted the us8,910,597 patent for the patpoc engine. This work evaluates further refinements in cylinder form, hone texture and oil. Opposed piston opposed cylinder engine mekanizmalar. Two major strengths of this type of engine make them better. Opoc ecomotors it comprises two opposing cylinders per module, with a crankshaft between them, each cylinder having two pistons moving in opposite directions. It has six pistons, two of which operate in each cylinder.
Opposedpiston op engines have attracted the interest of the automotive industry in. Radical new engines make a run at reality in the f150. Doxford opposed piston oil engine a trip back in diesel engine history authored by. General view of sterling crankless opposedpiston diesel engine, twocycle, solidinjection, fourcylinder, 3 by 4 inches. The opposedpiston engine also provides uniflow scavenging. Scavenge flow analysis of opposedpiston twostroke engine. The main advantage of opposed piston arrangement over others is that they have a higher power to weight ratio. As the opposed piston relative dynamic characteristics of opposed piston twostroke engine depend on different design and operating parameters including the opposed piston motion phase difference and crankconnecting rod ratio, a numerical simulation program was built using matlabsimulink to define opposed piston motion profiles based on. Ecomotors opposedpiston engine to be built in china. The opposedpiston turbo diesel engine is based on traditional design coupled with advanced engine health management strategies. Ecomotors opposed piston opposed cylinder engine youtube. Together, theyre going to work on an opposed piston twostroke single cylinder advanced combat engine technology demonstrator. Moving to largerdisplacement opposed piston engines, we look at the leyland l60. An opposed piston engine is a piston engine in which each cylinder has a piston at both ends, and no cylinder head petrol and diesel opposed piston engines have been used, mostly in large scale applications such as ships, military tanks and in factories.
This article is within the scope of wikiproject trains, an attempt to build a comprehensive and detailed guide to rail transport on wikipedia. An animation of opposed piston opposed cylinder engine. I am really surprised why the opposed piston engines are not in use they are the highly stable engines and deliver higher efficiency. Evolution, use, and future applications is written by jeanpierre piralt and martin flint, who have extensive expertise with this littleknown engine technology. Engine video at engineering tv startups work to reinvent the combustion engine. An engine with its cylinders arranged opposite each other in the same plane, with their connecting rods working on the same crankshaft. Ecomotors opoc two stroke engines opposed piston opposed. Achates power debuts gasoline opposedpiston engine in a lightduty truck at 2018 naias the truck features an op gci engine that will exceed cafe 2025 requirements. After the war, many of the highpowered engines used to drive trains, freighters and submarines utilized opposed piston designs. The patpoc can be seen as a short simplified opoc opoc stands for opposed cylinder opposed piston and is the engine of ecomotors bill gates.
The opoc engine is an opposedpiston opposedcylinder, 2stroke engine. Groundbreaking engine technology appears fairly frequently, but few designs ever make it. Introduction what is an opposedpiston engine in opposedpiston engines op pistons are arranged in such a way that two pistons are reciprocating opposite to. Opposed piston opposed cylinder opoc 450 hp engine. Jul 23, 2018 research has shown twostroke opposed piston engines to be wildly efficient. An opposedpiston engine is a piston engine in which each cylinder has a piston at both ends, and no cylinder head petrol and diesel opposedpiston engines have been used, mostly in large scale applications such as ships, military tanks and in factories. Nevertheless, several very successful opposedpiston engines, both of the fourstroke and twostroke type, have been and still are being produced for stationary, marine, automobile and aircraft duties. Each piston travels about half the distance of a cylinder in a conventional engine. An other great video thanks please keep them coming.
This is biggest benefit, that each piston requires less throw, which means the cranks can be smaller. An estimated 90% scavenging efficiency has been achieved with unique gas exchange characteristics of the opoc engine and the use of an electric assisted turbocharger. The new opoc diesel engine concept was presented at the sae 2005 world congress. How it works opposed piston opposed cylinder engine. Opposedpiston op engines have attracted the interest of the automotive industry in recent years because of their potential for significantly. It is the case of the opoc opposed piston opposed cylinder engine presented by ecomotors with fev. Operating on the twostroke cycle, the inwardlyopposedpiston engine offers reliability and efficiency of a breatheeasy piston port design. As compared to other conventional engines, the opoc has drastically small size. In this paper, the fuel injection system for the achates 2. The opposed piston turbo diesel engine is based on traditional design coupled with advanced engine health management strategies. New cummins opposed piston diesel engines mhh auto.
Jan 30, 2018 radical new engines make a run at reality in the f150. These advantages include a patented combustion system, threecylinder configuration and compact design, which maximizes thermal efficiency. Achates power opposed piston engine cost comparison initial results on a new lightduty 2. The earliest example of an opposed piston gas engine of which any record can be found is that produced by sturgeon in 1885. Ecomotors was an american company developing and commercializing an opposedpiston. As a diesel engine, the compact two cylinder engine produces 300 h. The opposed piston twostroke op2s engine architecture is widely recognized. The truck will achieve a combined 37 mpg, exceeding the proposed cafe 2025 regulation. Wikiproject trains to do list c this article has been rated as cclass on the projects quality scale. And, fromm points out, opposed piston engines are inherently smooth, so a single cylinder, two piston version could make an ideal range extender for a phev, especially since it can be made into a. Dec 04, 2016 the opoc engine is an opposed piston opposed cylinder, 2stroke engine. Twostroke opposedpiston diesel engine by achates power ee shirts. Instead of an i or a v pattern, ems opoc is laid out like a two cylinder boxer engine.
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