When did common rails come out?

Yeah that and about 30,000 psi more injection pressure and way better atomization. Lol

 

Cmon are you serious??


What is your point?

Are you saying that the evolution of the diesel engine is a bad thing?

Why would you not want more efficiency and better durability? Pilot injection has NO downside.

Maybe we should all have 318 Detroits? I mean you know... They worked just fine and you don't need more than that. Good grief.

 

Exactly. The engine burns so much more efficiently. We can have high hp and little smoke. This causes much less oil contamination too.

 

So they could theoretically run higher pressures through a Inline 6 cylinder pump to get better atomization. But you are still missing out on the fine control and precision timing that a common rail has to offer. Also why have a large heavy 6 cylinder pump when a small more compact 2 cylinder pump can supply all the pressure needed.
Diesels don't need to be loud, rattly and manly sounding. Its actually nice to drive the new 6.7 fords that are whisper quiet compared to my old 6.0.
Why stop at a 12v sounding tune? Get the full lope tune with a straight pipe. People will know you are a man from miles away.

 

Those "12 valve" tunes have always made me laugh. They always made about as much sense as taking a fuel injected car and putting a carburetor on it.

You should know that smoke and that big knocking sound doesn't=power

I prefer function over form generally and I'm always against posers.

I have tuned diesel pickups for over a decade and have always been in favor of power vs smoke show.
Always makes me laugh to spank a nitwit pickup truck "rolling coal" with a clean burning common-rail motor properly tuned with proper performance parts.

The traditional diesel "knock" is a result of lower combustion efficiency. The modern diesels being quieter is just a result of improved combustion efficiency.

I would say there is something nostalgic about a old mechanical diesel that rattles bangs and blows lots of smoke. But when it comes to power and whitee life, even the "crappy" emissions motors outlast the old engines.

Most all modern diesel engines will easily go over a million miles and you're not pulling oil pans off rolling bearings or any of that crazy stuff of the past.

I'm not saying I like the emissions components but when it comes to the evolution of the fuel system and engine design I'm all about that !!



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I wouldn't call older engines low pressure, on what we're calling common rail, the high pressure is in the fuel rail. On older engines, the unit injector multiplied the pressure using the injector lobe on the cam.

On common rail, the lift pump feeds the high pressure pump, which feeds the common rail.

With unit injectors, the lift pump feeds a common fuel port, then each injector is it's own high pressure pump.

Then there's unit pump type engines like Mack and Mercedes used. The injectors are similar to common rail, but each cylinder has it's own cam driven high pressure unit pump.

All of these are electronic injection and can have multiple injection points. All of cam lobe driven "pumps", deliver the same volume of fuel for every cycle. The ECM controls a solenoid in them to direct that fuel to either cylinder or return line. That's how it controls how much fuel is injected. If the solenoid is energized, it's spraying into the cylinder, if it's not, it pumps into the return port.