Compared to conventional MPI engines of a comparable size, the GDI engine provides approximately 10% greater output and torque at all speeds. In high-output mode, the GDI engine provides outstanding acceleration. The following chart compares the performance of the GDI engine with a conventional MPI engine.
GDI engines provide many benefits that conventional fuel injection can't. With gasoline direct injection technology, you can draw more power from smaller engines. In addition, your car gets improved fuel efficiency and reduced emissions. While great, the power of the GDI engine is a double-edged sword.
Some fuel injectors, like carburetors, mix in fuel at a single point in the throttle body. Multi-point injection (MPI) systems inject fuel at each cylinder, allowing much greater control over how much fuel the engine burns. In MPI systems, the injection generally takes place directly inside the cylinder's intake valve.
Turbocharged Direct Injection
Direct injection improves combustion efficiency, increases fuel economy and lowers emissions. Both systems use electronic fuel injectors to spray fuel into the engine, but the difference is where they spray the fuel. With port injection systems, fuel is sprayed into the intake ports.
Gasoline direct injection (GDI) and turbochargers are now common features of passenger cars and light trucks. By 2020, industry experts predict that nearly every new vehicle will feature GDI technology, and the vast majority will be turbocharged (TDGI).
Gasoline direct injection
Gasoline Direct Injection
The 4.3 is a good engine in terms of it is cheap to buy, cheap to run, parts are ubiquitous, they are easy to fix, and they are pretty bulletproof on the reliability front.
An inboard is a four-stroke automotive engine adapted for marine use. Inboard engines are mounted inside the hull's midsection or in front of the transom. The engine turns a drive shaft that runs through the bottom of the hull and is attached to a propeller at the other end.
Electronic Fuel Injection
Mercruiser Big Block 7.4L V8 Marine Engine Product Specifications
| Models | 7.4L MPI | 454 Mag MPI |
|---|
| Propshaft Horsepower (SAV1 Rating) | 3101 (2752) | 3851 |
| Propshaft Kilowatts (SAV1 Rating) | 2311 (2052) | 2871 |
| Displacement | 454 cid (7.4 l) |
| Maximum rpm @ WOT3 | 4200-4600 rpm | 4600-5000 rpm |
Power steering is standard, providing you complete and effortless control.
| HP / kW | 220 / 164 |
|---|
| Maximum RPM (WOT) | 4400-4800 |
| Engine type | V-6 |
| Displacement (L) | 4.3 |
| Bore and stroke | 4.00 x 3.48 / 101 x 88 mm |
Emissions Control Technology (ECT) A reliable catalyst system that produces cleaner exhaust without limiting the performance you expect out of a MerCruiser.
It's hard to beat a clean sheet of paper—and that was the metaphorical starting point for the new MerCruiser 6.2L MPI, a V8 engine Mercury Marine is shipping for sterndrive and inboard applications. “New automobile engines are designed to work best at a very light load,” said Foulkes.
Mercury MerCruiser is introducing an innovative new turn-key starting (TKS) system technology for its industry-leading carbureted sterndrive and inboard engines, dramatically simplifying starting the most common complaint among carbureted engine owners, according to recent J.D. Power and Associates research.
In more technical terms, the TSI stands for “turbocharged stratified injection,” while TDI stands for “turbocharged direct injection. When you have a hard time remembering which one is which, think of the D in TDI meaning that it has the diesel engine.
The 1.2 R4 TSI/TFSI (EA111 family) is a 1.2-liter four-cylinder gasoline turbocharged engine firstly introduced for VW Golf Mk6 and Polo Mk5 in late 2005. This engine partly replaced the same displacement naturally aspirated version of the EA111 series but with three cylinders - the 1.2 R3 EA111 engine.
TSI stands for “turbocharged stratified injection” and was inspired by the Volkswagen TDI Clean Diesel and FSI direct fuel injection engines. The engine allows for higher torque at lower RPMs, which means more power with less fuel usage.
Dimensions and Weight
The MerCruiser 4.3L MPI is 28 inches long, 30 inches wide, and 22 inches tall. It has a dry weight of 865 pounds.Recommended Oil
Mercury Marine, the manufacturer of the 4.3L MerCruiser engine, specifies that the owner use Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, with a NMMC EC-W rating. This specific oil is recommended by the company for all MerCruiser engines, including the 4.3L.
