Newbie here...

[Land Skipper]

Can someone explain the direct injection feature on the 2520?

As opposed to the non-direct injection Diesel type of the 2320.

Both are diesels right?

Thanks in advance.

LS.

 

[kennyd]

First, Welcome to TBN

Yes, both are Diesel engines. It has to do with the way the fuel is injected into the cylinders. Here is some text I copied from another SITE:

"Direct Injection (DI) vs. Indirect Injection (IDI). Most heavy vehicles today use direct injection (DI) diesel engines,
while until recently most automobile-size diesel engines have used indirect injection (IDI) technology. DI
engines inject fuel and air directly into the cylinder, while an IDI engine uses a prechamber to help mix the fuel
and air before entering the main cylinder. The IDI system comes with a 15 percent efficiency penalty compared to
the DI because the prechamber permits additional energy losses (Ashley 1997; Arcoumainis and Schindler 1997),
but its superior fuel and air mixing has been essential for diesel passenger vehicles. The small, high-speed engines
used in automobiles require fuel and air to mix 10 times faster than in larger engines (Heywood 1988), something
that has been difficult to achieve without a prechamber. Only recently have diesel engine developers overcome
this mixing limitation with DI engines."

In a nutshell, the DI engines are more efficient, start easier, and cost more!

Hope this helps...

 

[tomd999]

Hiya,

2320: Indirect injection engine. The high pressure pump runs at about 3-4000PSI, the injectors are more than likely a mechanical pop-off type spraying into a small pre chamber that is connected to the combustion chamber. The burning fuel and air mix expands into the main combustion chamber as it continues to burn. Engines of this type tend to crank a bit before they start, use a slightly leaner fuel curve and will tollerate bio-Diesel better than the higher pressure direct type systems.

2520: Direct injection (DI) engine. Fuel is injected at extremely high pressure (30,000 or so PSI) directly into the cylinder. DI engines are generally better on fuel however they are a bit noisy. (Remember the mid '90's Dodge Cummins that sounded like cement mixers?) Newer on the road DI engines with computer controled digital injectors inject fuel multiple times during one combustion cycle, injecting the fuel in short bursts multiple times during the combustion stroke smooths the pressure curve and amazingly makes more power at the same time lessens emissions and helps quiet them down. (Ford calls it "Power Stroke", I believe Cummins calls it "Common Rail" technology) DI engines also generate less heat and volume of exhaust gas so turbos need to have smaller housing to help maintain boost. They are slightly less tollerant of bio-Diesel fuels however they will still run them just fine.

I did this from memory so I may have missed a thing or so,

Tom

 

[Land Skipper]

Thanks Ken!

Great info. My education has begun.

LS.

First, Welcome to TBN

Yes, both are Diesel engines. It has to do with the way the fuel is injected into the cylinders. Here is some text I copied from another SITE:

"Direct Injection (DI) vs. Indirect Injection (IDI). Most heavy vehicles today use direct injection (DI) diesel engines,
while until recently most automobile-size diesel engines have used indirect injection (IDI) technology. DI
engines inject fuel and air directly into the cylinder, while an IDI engine uses a prechamber to help mix the fuel
and air before entering the main cylinder. The IDI system comes with a 15 percent efficiency penalty compared to
the DI because the prechamber permits additional energy losses (Ashley 1997; Arcoumainis and Schindler 1997),
but its superior fuel and air mixing has been essential for diesel passenger vehicles. The small, high-speed engines
used in automobiles require fuel and air to mix 10 times faster than in larger engines (Heywood 1988), something
that has been difficult to achieve without a prechamber. Only recently have diesel engine developers overcome
this mixing limitation with DI engines."

In a nutshell, the DI engines are more efficient, start easier, and cost more!

Hope this helps...

 

[Land Skipper]

Thanks Tom!

I have a 3/4 ton Dodge Ram Cummins.

I love diesel engines.

LS.

Hiya,

2320: Indirect injection engine. The high pressure pump runs at about 3-4000PSI, the injectors are more than likely a mechanical pop-off type spraying into a small pre chamber that is connected to the combustion chamber. The burning fuel and air mix expands into the main combustion chamber as it continues to burn. Engines of this type tend to crank a bit before they start, use a slightly leaner fuel curve and will tollerate bio-Diesel better than the higher pressure direct type systems.

2520: Direct injection (DI) engine. Fuel is injected at extremely high pressure (30,000 or so PSI) directly into the cylinder. DI engines are generally better on fuel however they are a bit noisy. (Remember the mid '90's Dodge Cummins that sounded like cement mixers?) Newer on the road DI engines with computer controled digital injectors inject fuel multiple times during one combustion cycle, injecting the fuel in short bursts multiple times during the combustion stroke smooths the pressure curve and amazingly makes more power at the same time lessens emissions and helps quiet them down. (Ford calls it "Power Stroke", I believe Cummins calls it "Common Rail" technology) DI engines also generate less heat and volume of exhaust gas so turbos need to have smaller housing to help maintain boost. They are slightly less tollerant of bio-Diesel fuels however they will still run them just fine.

I did this from memory so I may have missed a thing or so,

Tom

 

[JDGREEN4ME]

Might have nothing to do with it but I remember the tractor I had w/direct injection started better in the cold than the in-direct injection one did.