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40 mpg Prius vs 50 mpg European Diesel cars - Page 6

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Posted by Michael Pardee on May 2, 2006, 12:20 pm
 

I've heard "yes" and "no" that Europe has more refined diesels (a Swedish
friend who visits family every year says "no"); I presume the common rail
engines are the ones they are talking about. I'll have to study those more.
Do you know if they are available in any US cars?

Mike
(who agrees about the laughter!)



Posted by Keith Willcocks on May 2, 2006, 12:52 pm
 


I have no idea whether they are available in the US but I would be surprised
if they weren't.    I am in England and common rail are the norm over here
now.   Different companies have different names for their version, Peugeot
is HDI but I have seen many others, much like the different names given to
automatic gearbox systems.   My cousin who was over from the States was well
impressed with my Peugeot 406.

I am no expert but as I understand it the older diesels had a pump looking
like a distributor with a pipe to each injector and it pumped a shot of
diesel into each cylinder at the appropriate moment being controlled
mechanically.   The common rail has one pipe along the side of the engine
(the common rail) which has a pipe to each injector and the whole system is
under continuous high pressure.   The injectors are controlled
electronically by the ECU which instructs them when to inject fuel and how
much.   Obviously there is much more to it but that is all I know.   Suffice
it to say that there is a world of difference between driving the two types.
I believe you even get Jaguars now with common rail diesel engines.

Glad you like my motto, its works well in this day and age.
--
Keith Willcocks
(If you can't laugh at life, it ain't worth living!)



Posted by Michael Pardee on May 3, 2006, 1:56 am
 
That makes sense - I assume the clatter is from the mechanical injectors.

Mike



Posted by Ray O on May 3, 2006, 2:20 am
 

Modern diesels have electronic fuel injection.  Here are some good
descriptions of what causes diesel clatter:
http://www.eng-tips.com/viewthread.cfm?qid 9341&page=7
--

Ray O
(correct punctuation to reply)



Posted by Michael Pardee on May 3, 2006, 2:55 am
 
That's an interesting link, although about all I can say is the subject of
clatter is still controversial. It sure sounds like the combustion profile
is important.

Mike



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