Posted by Ray O on May 3, 2006, 3:01 am
<snipped>
>>> That makes sense - I assume the clatter is from the mechanical
>>> injectors.
>>>
>>> Mike
>>>
>> 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)
>>
> 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
I wouldn't describe the subject of the source of diesel clatter as
controversial. IMO, "uninformed" is a more accurate description, especially
in the U.S. where diesels are not common in passenger car applications.
Basically, diesel "clatter" is the same sound you get when a gasoline engine
is knocking. Add different tolerances and you get more noise at idle.
--
Ray O
(correct punctuation to reply)
Posted by Ken on May 25, 2006, 9:33 am
There was much discussion in this thread about a diesel hybrid
It turns out that GM of all people is way ahead in devloping hybrid
diesel - in buses. the following links tell the story - diesel, hybrid,
regenerative braking - the lot! 60% gain in economy.
www.shadetreemechanic.com/allison_hybrid_drive.htm
www.gm.com/company/gmability/edu_k-12/9-12/fc_energy/hybrid_allison.html
www.hybrid-vehicles.net/gm-allison-hybrid-bus.htm
I owe it to an Australian electronics magazine - Silicon Chip - which
is running an article in its June issue on this GM - Allison project
which is not pie in the sky - the vehicles are operating in various
parts of the US.
Posted by mailman on May 5, 2006, 2:01 am
On Tue, 2 May 2006 18:56:36 -0700, "Michael Pardee"
>>
>> 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.
Same engine as the new 407 Hdi coupe V6 twin tubo>
>That makes sense - I assume the clatter is from the mechanical injectors.
>Mike
Yes the mechanical injector make clatter plus the mechanical injector
pump as well. The common rail diesel are much quiter than mechanical
injected diesel . A interesting point here is that indirect injected
diesel (mech.) is quiter than a direct injected diesel (mech.).
Down under we are paying between $A 1.42 to $A 1.44 per litre for
diesel.
Yandoit Australia
*
* *
+ "A poor excuse is like an old bucket; doesn't matter
what shape it's in, as long as it holds water"
*
PK Shaw
---
avast! Antivirus: Outbound message clean.
Virus Database (VPS): 0618-2, 04/05/2006
Tested on: 5/05/2006 12:01:42 PM
avast! - copyright (c) 1988-2006 ALWIL Software.
http://www.avast.com
Posted by Coyoteboy on May 3, 2006, 1:11 pm
Michael Pardee wrote:
<snip>
Commonrail diesels are VERY good. Comparable power and better torque
than all but the top end petrol model-mates. They drive less like a
diesel than old TDs and get HUGE economy. Theyre quiet, not quite as
quiet as a petrol I admit, but certainly quieter than an older petrol
engine. This is why ive never seen the point of hybrid as a current
choice of car, maybe in 10 years when theyve matured.
J
Posted by Michael Pardee on May 3, 2006, 4:59 pm
> Michael Pardee wrote:
> <snip>
> Commonrail diesels are VERY good. Comparable power and better torque
> than all but the top end petrol model-mates. They drive less like a
> diesel than old TDs and get HUGE economy. Theyre quiet, not quite as
> quiet as a petrol I admit, but certainly quieter than an older petrol
> engine. This is why ive never seen the point of hybrid as a current
> choice of car, maybe in 10 years when theyve matured.
> J
Hybrids work at the other end of the driving spectrum. The only advantage
they offer on the open road (where diesels shine) is the ability to reduce
engine size while maintaining passing performance, but in town they reduce
the amount of time a gas or diesel engine is run in the lowest efficiency
ranges. Hybridizing with a turbo diesel power plant is a very attractive
idea - each covering the weaknesses of the other. There is no reason a TD
hybrid 5 passenger sedan couldn't offer more than 100 mpg in town and 80 mpg
on the freeway, at least at 65 mph. Mainly it takes advances in the power
electronics.
Mike
XML site map
>>> injectors.
>>>
>>> Mike
>>>
>> 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)
>>
> 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