Injection Questions
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Logistics Pro
Joined: Oct 2008
Posts: 4,818
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From: Avilla, IN
Injection Questions
When you look at a HEUI engine, the injectors are inside the valve covers. And they inject the fuel over the center of the cylinder. That makes sense.
But on say an old IDI, like a 6.9, 7.3 or a Farmall 1206, the injectors are not under the valve covers. AND they are not co-linear with the cylinder. Do they inject fuel in the "side" of the top of the combustion chamber?
How about the newer Common Rail injection engines? Are the injectors co-linear with the cylinder, and are the injectors under the valve covers?
But on say an old IDI, like a 6.9, 7.3 or a Farmall 1206, the injectors are not under the valve covers. AND they are not co-linear with the cylinder. Do they inject fuel in the "side" of the top of the combustion chamber?
How about the newer Common Rail injection engines? Are the injectors co-linear with the cylinder, and are the injectors under the valve covers?
Posting Guru
Joined: Jan 2009
Posts: 1,955
Likes: 2
From: Wyoming
Hopefully someone more knowledgable can step in here. From what I could remember back to some of my dad's older diesels, they ran an injector in the same location as a gas would under a rail, and were cambered in at an slight angle into the cylinder. I remember they ran off of several steel lines from an injector pump that was a horrific nightmare, as most were unreliable and leaked like a son of a gun! LOL!
Posting Guru
Joined: Jun 2006
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The 6.9-7.3 "IDI"s are indirect injection, the fuel is injected into a prechamber that has an opening into the cylinder.
Common rail/HEUI really has nothing to do with it, a diesel is either of the direct injection design(no prechamber)and sprays at center of piston or it is indirect injection(into a prechamber)which makes little differance what angle the injector is.
Common rail/HEUI really has nothing to do with it, a diesel is either of the direct injection design(no prechamber)and sprays at center of piston or it is indirect injection(into a prechamber)which makes little differance what angle the injector is.
