Serving Farmington Hills,Farmington,Novi ,Livonia,Northville Since 1958
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Major and Minor Engine Repairs on all Makes and Models
Engine Overhauls
Tune-ups for Diesel Engines
State-of-The-Art Computer Diagnostics
Air Systems and Fuel Systems
Preventive Maintenance Services |
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History of the 7.3 liter International Engine |
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| 7.3 Powerstroke |
| The first 7.3L was produced from 1988-1993. The original 7.3L diesel was a non-turbo charged indirect injection (IDI) engine, followed shortly after by a turbo charged version. It was very similar to the previous 6.9l IDI diesel engine, which was simply bored out for more torque. This engine is not considered in the powerstroke family. In 1994, the 7.3L underwent some changes. The 7.3L was changed to a direct injection (DI) engine from the original IDI engine. |
| Ford also added electronic fuel injectors and gave it the name Power Stroke. This model produced up to 250 hp (190 kW) and 525 lb·ft (712 N·m) of torque. The new 7.3L DI Power stroke had "single shot" HEUI (hydraulic electronic unit injectors) fuel injectors and ran a 15º high pressure oil pump (HPOP) to create fuel injection pressures. The turbine housing was a 1.15 A/R. In 1999, an air to air intercooler was added. The intercooler cooled the charged air from the turbo making it denser. The cooler, denser air would increase the horsepower potential of the engine, while also reducing exhaust gas temperatures (EGTs). The turbine housing was changed to a .84 A/R housing and a wastegate was added. |
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The "single shot" HEUI injectors were upgraded to "split shot" injectors. With larger injectors, the HPOP was advanced to 17º to increase fuel pressures. The 7.3L DI Power Stroke was in production up until 2004 when it was replaced by the 6.0L. The 7.3 IDI and 7.3 Powerstroke are not the same engine at all except manufactured by International for Ford. This is known to be the longest lasting and most reliable powerstroke engine.
We Are Powerstroke Experts | |
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Hydraulically Actuated Electronically Controlled Unit Injector
The new HEUI Fuel systems on the Power Stroke required the use of two oil pumps. A low-pressure (lubricating) pump feeds oil into the high-pressure oil reservoir, where the high-pressure oil pump (HPOP) forces oil through oil lines to two high-pressure oil rails, one located in each cylinder head at an injection oil pressure of 500-3,000 psi. The pressure is controlled electronically by a regulator located inside the pump. Basically, all of this culminates in a unique system where the oil increases the fuel pressure at the injectors |
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Second-Generation Power Stroke
The second generation of 7.3L began with the '99 model year. This version of the Power Stroke was intercooled (termed charge air cooling or CAC), fittingly for trucks labled "Super Duty," and put out more horsepower and torque. First-year Super Dutys and '00 engines put out 235 hp and 500 lb-ft of torque. Although '99 and '00 models shared the same engine, '99s can be spotted by their "Power Stroke V-8" badge that is visible in front of the truck's front fender-wells. Power Stroke badges built in 2000 or later are displayed on the bottom of each truck's door panels. | |
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| | What Generation Engine is in my Truck? Click below to find out
7.3l Power Stroke 1st Generation or Second Generation
| How diesel engines work
When gas is compressed its temperature rises. A diesel engine exploits this property in order to ignite the fuel. Air is drawn into the cylinder of a dieselengine, and compressed by the rising piston. This happens at a much higher compression rate than in a spark-ignition engine. At the top of the piston stroke diesel fuel is injected into the combustion chamber at high pressure through an atomising nozzle. It mixes with the hot, pressurised air. The resulting mixture ignites and burns very rapidly. This contained explosion causes the gas in the chamber to expand, driving the piston down with considerable force, and creating power in a vertical direction.
| | A gasoline engine intakes a mixture of gas and air, compresses it and ignites the mixture with a spark. A diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously.
A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1. The higher compression ratio of the diesel engine leads to better efficiency
| Gasoline engines use either a carburetor or a fuel injection system to deliver the fuel to the cylinder. With a carburetor the fuel is mixed as it enters the intake manifold, long before it gets to the cylinders. In a fuel injection system the fuel is injected just before the intake stroke at the intake valve
Diesel engines use direct fuel injection (DI), that is to say the diesel fuel is injected directly into the cylinder. The diesel engine has no spark plugs. The air it takes in is compressed and the fuel is injected directly into the cylinder where the heat caused by the air compression ignites the fuel. In the old days this meant that it exploded and expanded very quickly, making a noisy engine. This is why most diesel cars were IDI (indirect injection); the rough behavior was fixed by injecting the fuel into a small pre-combustion chamber that is connected to the cylinder by a narrow passage.
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