Which is better direct injection or fuel injection?
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. With direct-injection technology, the main benefit is better fuel economy for most applications and a bit more power.
Why is direct injection more efficient?
Direct injection engines literally give you more bang for your buck, for two main reasons. One, they use a “leaner” fuel-air mixture ratio. Second, the way the fuel disperses inside the chamber allows it to burn more efficiently.
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 engines have both port and direct injection?
Examples include:
- 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.
Is direct injection good or bad?
Finally, the biggest concern with direct-injection technology is with carbon buildup. In a direct injection engine, oil droplets tend to get ‘baked’ on the valve. Carbon buildup can create a lot of headaches in the long-term, with build-up being bad enough to make extra noise during operation and damage the engine.
How much HP gain from a fuel injection?
The technical answer is yes; fuel injectors can add 10 extra horsepower at peak. However, for some car owners, that minimal difference does not offset the increased cost and complexity of switching to fuel injectors or upgrading the existing stock fuel injectors.
What is the difference between direct and indirect injection?
The main difference between Direct and Indirect Injection is the layout of the injection system, the Indirect Injection System actually has a small swirl chamber above the cylinder, where the fuel is injected, this chamber also contains the glow plug, which is much needed to start the engine, the Direct Injection.
What is the disadvantage of direct fuel injection?
The big disadvantage of direct injection is carbon buildup on the backside of the intake valves. This can throw a computer code, and could result with an engine miss or a ignition failure. The other disadvantage of direct injection is cost.
Is indirect injection more fuel efficient?
Fuel efficiency is lower than with direct injection because of heat loss due to large exposed areas and pressure loss due to air motion through the throats. This is somewhat offset due to indirect injection having a much higher compression ratio and typically having no emissions equipment.
What are the different types of fuel injection?
Over time, the point of injection has moved closer and closer to the cylinders themselves. The three major types of fuel injection are known as throttle body injection, multiport injection, and direct injection.