Can 2 strokes be fuel-injected?
Can 2 strokes be fuel-injected?
The holy grail of off-road motorcycling is a reliable, high-performance, fuel-injected two-stroke engine with optimized combustion so unburned fuel doesn’t foul exhaust fumes so horribly.
What is a direct injection two-stroke?
In two-stroke engines This results in some of the fuel/air mixture entering the cylinder and then exiting the cylinder, unburned, through the exhaust port. With direct injection, only air (and usually some oil) comes from the crankcase, and fuel is not injected until the piston rises and all ports are closed.
Does direct injection increase HP?
Direct injection technology provides slightly more power and better fuel economy; depending on the application, it’s usually in the 10–15 per cent range of improvement. But engine torque delivery can be bumped by as much as 50 per cent.
Which is better direct injection or port injection?
Port injection provides a better, more stable air/fuel mixture at lower engine speeds, which results in smoother operation upon startup. At higher rpm, direct injection provides a greater cooling effect, allowing for more power and less chance of knock.
Why are 2 strokes so fast?
Two-stroke engine bikes are lighter and faster bikes that have an intense kick to the motor. This makes it easier to throw around your bike with the faster punch per cc. Two-strokes also require more frequent shifting, but riders can get a faster top speed with more power.
What is the fastest 2 stroke?
All eyes are in Alex “Horsepower” Hughes and Bill Baxter as the men who hold the record for quickest naturally aspirated two stroke at 7.82 on their truck 72 Kawasaki H2 750 want to take at the overall two stroke record at 7.77, done with nitrous oxide.
Is direct injection the same as fuel injection?
The difference is how they atomize the fuel: direct injection uses very high pressure and is sprayed directly into the spark plug area to ignite. Port fuel injection uses heat from the valves to atomize the fuel before being ingested into the cylinder when the valve opens,” Kociba said.
What’s the difference between direct injection and fuel injection?
With multiport fuel injection, fuel atomizes as it’s sprayed into the intake port and then is pulled into the combustion chamber. With direct injection, the injectors are in the cylinder head and spray fuel directly into the combustion chamber, mixing with the air charge.
Which is better MPI or GDI?
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.
What is the problem with GDI engines?
GDI problems Many people have complained to the National Highway Traffic Safety Administration that their GDI-powered cars experience high rates of fuel system clogging and engine carbon buildup. The results can be drastic, with some drivers experiencing loss of power and engine stalling.
Which engines have both port and direct injection?
- Redesigned Ford 3.5L EcoBoost and V6 engines.
- Lexus 2GR-FSE engines.
- Audi’s VW Group 3.0-liter V-6 and 5.2-liter V-10 engines.
- Toyota’s 2.0-liter in-line four-cylinder engines built by Subaru, and D4-S 3.5-liter V6 and 5.0-liter V-8 engines.
Which is better GDI or Mpfi?
A GDI system also has more flexibility regarding when in the combustion cycle the fuel is added. MPFI systems can only add fuel during the intake stroke of the piston, when the intake valve is open. GDI engines also react more quickly to these changes in timing and amount of fuel addition, increasing driveability.
What is a DFI two-stroke motor?
Modern DFI two-strokes utilize injectors like this one from the Evinrude ETEC line, to gain a huge efficiency boost. Two-stroke outboard motors with DFI (direct fuel injection) were developed in response to an EPA mandate requiring a 75 percent reduction in exhaust emissions between 1998 and 2006.
How does a two-stroke engine work?
Unlike the four-stroke engine, the two-stroke does not have moving valves to seal the combustion chamber and control the flow of intake and exhaust. In a two-stroke engine the rising and falling piston covers and uncovers ports in each cylinder through which a fuel/air mixture flows into, and exhaust flows out of, the combustion chamber.
Who makes two-stroke engines for snowmobiles?
Arctic Cat is committed to two-stroke engine designs for its snowmobiles and it is working on direct injection designs. Yamaha builds two-stroke outboards with High-Pressure Direct Injection (HPDI).
What is an E-TEC direct injection system?
The E-TEC direct injection system was developed to meet the emission standards while providing less weight and good performance and fuel economy at a lower cost than competing four-stroke engines.