Talk:Common rail

message: So, does anyone know if it is possible to run such an engine using uk domestic heating oil, without needing any modifications or causing other engine problems?
Regards
Gordon Brown
:I take it this is a joke question? Heating oil is a much different thing from diesel as far as I'm aware. Much heavier and thicker for a start. Unless you are actually running on light paraffin or kerosene. In which case you'll need a pre-heater, but otherwise it'll probably be ok...?
:Oh yeah and you'll probably have to keep a fairly hefty envelope full of cash with you at all times whilst driving in case a police or revenue officer stops you and checks what you have in your tank. I presume you're asking because heating oil is a great deal cheaper than automotive fuel, partly because it isn't subject to the same level of punitive taxes - and is therefore totally illegal to use as motor fuel without a specific exemption being granted. 87.113.89.205 (talk) 13:43, 29 January 2012 (UTC)
thread_title:  Fuelling a Common Rail Diesel

message: Dear Author,
Volkwagen TDI is not a common rail diesel. Volkwswagen will probably be starting to build common rail diesel engines from 2007. Source: volkswagen Holland.
Regards, Elias
::And that's what the article says, Elias...212.181.109.66 (talk) 09:54, 27 May 2008 (UTC)
thread_title:  TDI and CDI 

message: What is a fuel rail ?. --Mac 11:08, 28 June 2006 (UTC)
thread_title:  Fuel rail 

message: The first part of this article does not describe a common rail system as the term is used in the engine industry, but a unit injector system. A common rail system is an injection system where the fuel rail is held at injection pressure (1000 bar or higher) and the injectors do not perform any internal pressurization. A unit injector system does have a "fuel rail" but it is merely the passage that carries low pressure fuel to the injectors to be pressurized there. Calling this a common rail system to an engine designer will only lead to strange looks.
I don't know - probably no stranger than describing a gasoline direct injection (GDI) engine as running petrol...Jmdeur (talk) 17:57, 8 July 2009 (UTC)
thread_title:  Common Rail vs. Unit Injectors 

message: Suggestion to improve readability for naive entry to the article
The following text from the body of the article could be moved to the top. It would provide a reasonably satisfactory single-paragraph statement of what common rail is. (this text is from the body. I didn't make it up)
The term "common rail" refers to the fact that all of the fuel injectors are supplied by a common fuel rail which is nothing more than a pressure accumulator where the fuel is stored at high pressure. This accumulator supplies multiple fuel injectors with high-pressure fuel. This simplifies the purpose of the high-pressure pump in that it only needs to maintain a commanded pressure at a target (either mechanically or electronically controlled).  — Preceding unsigned comment added by 2001:DC0:A000:4:F120:DC44:41BD:709D (talk) 23:10, 2 February 2016 (UTC)
replies: text: Completely agree with point 2. How can the prototype (late 1960s) have been developed 50 years after the technology first entered service with Vickers (1915)? The article is bizarre. Also, could something be said about the manufacturing hurdles for Common Rail technology to have taken so long to be commercialized in motor car IC engines.JBel (talk) 20:50, 12 October 2011 (UTC)
replies: text: The reason for this discrepancy is that when people research engine history, they tend to only research road car engines, ignoring the advances and technology in aviation and industrial engines. Mechanical common rail was in place on Doxford engines long before it was available in any vehicle. I don't know anything about the Vickers system, unfortunately. --Joffeloff (talk) 09:24, 15 January 2013 (UTC)
thread_title:  Article issues 

message: The list in the section "Common rail today" shows the growing and wide spread use of common rail technology. However, the list is introduced as containing brand names of car makers using common rail when there are notable markets and manufacturers outside the car market that use common rail.  The section needs some updating to be inclusive of the broader application of common rail.  RockyCliff (talk) 03:52, 30 November 2010 (UTC)
thread_title:  Introduction to the list in the section "Common rail today"  is restrictive 

message: So ... was common rail developed in the 1960s?
Or already in use in 1942, and the 19-teens?
We surely can't have it both ways can we, unless that sixties engine designer tripped over and dropped his plans into an experimental time machine in the same lab? 87.113.89.205 (talk) 13:58, 29 January 2012 (UTC)
replies: text: Typical wiki - every individual fact is correct, but the whole is unreadable.  If anyone wants to rework this, the main point for improvement would be to distinguish between types of engines (compression ignition / spark ignition, their fuel: diesel / heavy oil / petrol, and also the size and application: ships / large generators / trucks / cars). Andy Dingley (talk) 14:32, 29 January 2012 (UTC)
thread_title:  wait wait wait 

message: First picture in this article it's a Multipoint Fuel Injection...  — Preceding unsigned comment added by Rfguicacs (talk • contribs) 07:33, 1 June 2012 (UTC)
replies: text: As stated by the above user, the image I recently removed is of a fuel rail used for multi-point fuel injection. The general fuel injection article explains the difference between the two better than I could, but mainly MPFI has a much lower fuel pressure than common rail injection, and the timing of ignition is less important since the fuel is injected into the manifold before the intake valve, instead of directly into the cylinder (or a prechamber). You can easily tell the difference, as an MPFI rail will have fuel lines going to exposed injectors that inject into the manifold, while a common rail system's rail will have lines going to injectors in the cylinder head. --Joffeloff (talk) 09:24, 15 January 2013 (UTC)
replies: text: Thank you for elaborating. I have just started the process for renaming the file (:File:Injector common rail.jpg). If there are other mis-categoried files in the Commons category, please do not hesitate to move them or ask help doing so. Thanks for the input! Ariadacapo (talk) 16:56, 16 January 2013 (UTC)
thread_title:  First Picture 

message: Common rail (or simply COM) is a term used in electrical engineering too to define common paths of currents in a circuit. The article should reflect this or a new article should be made. --Rev L. Snowfox (talk) 14:33, 26 December 2013 (UTC)
thread_title:  Electrical common rails 

message: Lede currently  reads in part On diesel engines, it features a high-pressure (over 1,000 bar or 100 MPa or 15,000 psi) fuel rail feeding individual solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors (or pump nozzles). (my emphasis)
That may be true of car engines (of which I have little experience) but it's certainly not true of small marine diesels... and I suspect of small diesels generally. The still-common arrangement here is to have a single high-pressure injector pump with a separate high-pressure line to each injector. The injectors are little more than no-return valves, having and needing no power supply or control connections (apart from the high-pressure lines themselves, which control the timing and quantity by Pascal's principle).
You can see two examples of pumps for the system I am describing at right. The top one is on a six-cylinder engine. There are six high-pressure lines leading to six "dumb" injectors. The bottom is a three-cylinder engine. These pumps are sometimes called distributor pumps (and that should not be a redlink).
That, I have always assumed, is the reason that common-rail systems are called what they are. There's a common high-pressure line, as opposed to one per cylinder in the older system. But both systems use high-pressure lines to feed the injectors. It's just a matter of how many.
I'm not doubting that some, perhaps many, pre common rail diesels used the system as described in our article. I have heard of cam-driven injectors used on older diesels, all fed by a low pressure (common) fuel line. I've just never worked on one. I suspect that large marine engines may still work this way. 
My experience, pre common rail, is limited to small marine engines, and a few diesel tractors, light trucks, and buses. But it concerns me that ALL of these have used the system I described. It's still in use, was once very common, and in some applications at least it still is. As the whole reason that common rail is called what it is, it should have at least a mention in the lede.
Am I missing something? If I'm right, then our current article is highly confusing and misleading... or in layman's terms, just plain wrong. Andrewa (talk) 19:04, 24 August 2016 (UTC)
thread_title:  Lede 

message: "Fuel rail" redirects here, to Common rail, which I believe is incorrect; it also refers to the "common" fuel rail for previous, non-direct injection systems, yet this is not mentioned here at all.
I propose the article be corrected to also include older variants, because the only real difference between Common rail / Direct injection and older gasoline/petrol injection systems is in the system pressure and injection timings.
The other possibility is making the redirect to Fuel injection article, preferably creating such a section first. --Arny (talk) 18:43, 3 March 2018 (UTC)
thread_title:  Fuel Rail vs. Common Rail 

message: According to the german page on common rail injection was the first on street usage in the 1980's was the East German IFA MN 106. This is quite a bit earlier than the 90's application by denso  
  — Preceding unsigned comment added by Harrstein (talk • contribs) 21:20, 22 December 2018 (UTC)
replies: text: Seems like the MN 106-engine with common rail was only used in one single IFA W 50 in 1985, but was never used in serial production. Still notable, if you ask me.--Qwertz1894 (talk) 21:45, 3 March 2022 (UTC)
thread_title:  Ifa