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Direct Injection Vs Indirect Injection Engine - Car Talk - Nairaland

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Direct Injection Vs Indirect Injection Engine by Eyop: 3:02pm On Jul 07, 2014
Hello house... Siena and co...please can you please explain to me which is better because most cars manufactured these days are making use of the Direct Injection Engines and i understand that it economizes fuel better than the Indirect injection. What are the problems associated with this type of Engines?
Re: Direct Injection Vs Indirect Injection Engine by Nobody: 7:21pm On Jul 08, 2014
The better one is the one that the engineers fitted to the car.

Direct injection in my opinion is the way forward. It makes more power, clean power. Diesels have always been direct injection.

So if I were you I wouldn't let that be the decision factor in choosing a vehicle.
Re: Direct Injection Vs Indirect Injection Engine by Nobody: 7:30pm On Jul 08, 2014
CityNG: Diesels have always been direct injection.

Urrrmmm, diesels haven't always been direct injection. They were indirect injection up to the late 1980's. Audi pioneered Direct Injection Diesel, with the first passenger car to run the new system being the type 44 Audi 100. This was the 2.5 TDI in Europe, and this was back in 1988.

The type 89 Audi 80 followed with the 1.9 TDI. Back then, Audi's biggest competitor was BMW, with the E34 525 TDS.
Re: Direct Injection Vs Indirect Injection Engine by Eyop: 7:32pm On Jul 08, 2014
Siena:

Urrrmmm, diesels haven't always been direct injection. They were indirect injection up to the late 1980's. Audi pioneered Direct Injection Diesel, with the first passenger car to run the new system being the type 44 Audi 100. This was the 2.5 TDI in Europe, and this was back in 1988.

The type 89 Audi 80 followed with the 1.9 TDI. Back then, Audi's biggest competitor was BMW, with the E34 525 TDS.
So siena what's your advice about the direct and indirect fuel injection.
Re: Direct Injection Vs Indirect Injection Engine by Nobody: 7:41pm On Jul 08, 2014
Eyop:
So siena what's your advice about the direct and indirect fuel injection.

Advice in terms of what, bro?
Re: Direct Injection Vs Indirect Injection Engine by Eyop: 7:46pm On Jul 08, 2014
Siena:

Advice in terms of what, bro?
I mean what you have to say about direct injection engines,the problems associated with it and same with indirect injection engines.
Re: Direct Injection Vs Indirect Injection Engine by Nobody: 7:57pm On Jul 08, 2014
Siena:

Urrrmmm, diesels haven't always been direct injection. They were indirect injection up to the late 1980's. Audi pioneered Direct Injection Diesel, with the first passenger car to run the new system being the type 44 Audi 100. This was the 2.5 TDI in Europe, and this was back in 1988.

The type 89 Audi 80 followed with the 1.9 TDI. Back then, Audi's biggest competitor was BMW, with the E34 525 TDS.

I respectfully disagree Siena.

http://auto.howstuffworks.com/diesel2.htm

In my opinion any system that introduces fuel directly into the cylinder (directly injecting it) as opposed to mixing it in a fuel bowl ala carburetor is direct injection.
Re: Direct Injection Vs Indirect Injection Engine by Nobody: 9:58pm On Jul 08, 2014
CityNG:

I respectfully disagree Siena.

http://auto.howstuffworks.com/diesel2.htm

In my opinion any system that introduces fuel directly into the cylinder (directly injecting it) as opposed to mixing it in a fuel bowl ala carburetor is direct injection.

Just as respectfully bro, I'll disagree. And I'm glad you used "in my opinion" in your above statement. Because that's just an opinion, the way you've interpreted the way diesel is mixed in the engine. Very different from scientific facts.

Direct Injection diesel with a CR of 23:1?? How will that engine hold together with a massive CR value, and high pressure injected diesel?

When Direct Injection Diesel engines became widely used, I was contracted to Dovercourt Audi UK. And a bunch of us techs from different dealerships underwent training at Audi's Academy in Milton Keynes, to get to grips with the new technology.

This was in 1991, when the first of the TDI engines made it over from Europe (where Direct Injection Diesels first went on sale).

Prior to this, Diesel engines were indirect injection, with Ricardo chambers in the piston crowns. And an average compression ratio of 23:1. With Direct Injection, this has enabled the CR to drop as low as 16:1, which isn't much higher than a modern gasoline engine.

Let me make it easier, by asking you a question.

What is the difference between Peugeot's 1.9 Turbo-D and their excellent 2.0 HDI?
Re: Direct Injection Vs Indirect Injection Engine by Nobody: 11:26pm On Jul 08, 2014
Siena:

Just as respectfully bro, I'll disagree. And I'm glad you used "in my opinion" in your above statement. Because that's just an opinion, the way you've interpreted the way diesel is mixed in the engine. Very different from scientific facts.

Direct Injection diesel with a CR of 23:1?? How will that engine hold together with a massive CR value, and high pressure injected diesel?

When Direct Injection Diesel engines became widely used, I was contracted to Dovercourt Audi UK. And a bunch of us techs from different dealerships underwent training at Audi's Academy in Milton Keynes, to get to grips with the new technology.

This was in 1991, when the first of the TDI engines made it over from Europe (where Direct Injection Diesels first went on sale).

Prior to this, Diesel engines were indirect injection, with Ricardo chambers in the piston crowns. And an average compression ratio of 23:1. With Direct Injection, this has enabled the CR to drop as low as 16:1, which isn't much higher than a modern gasoline engine.

Let me make it easier, by asking you a question.

What is the difference between Peugeot's 1.9 Turbo-D and their excellent 2.0 HDI?

Yes it's my opinion but one I reached by educating myself on the technology from various sources.

Here's another example:

"Diesels and direct fuel injection

Virtually all diesel engines use direct fuel injection. However, because diesels use a different process to combust their fuel (gasoline engines compress a mixture of gasoline and air and ignite it with a spark; diesels compress air only, then spray in fuel which is ignited by the heat and pressure), their injection systems differ in design and operation from gasoline direct fuel injection systems."

Source = http://cars.about.com/od/thingsyouneedtoknow/a/directinjection.htm and that every single diesel engine I've ever seen has the injectors going directly into the combustion chamber as opposed to mixing air in a fuel bowl.

I cannot answer your question without doing research because frankly apart from the classic Peugeots I don't consider Peugeots to be a worthy marque to be interested in. I did own a 505STi in the US for a while. So, Herr Dokter, please grant me an education waiver - lol.

Here in the US, Peugeots are persona non grant - I am sure that Ikenna will sanction me for this oversight.

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