Honda Car Forum

On Thu, 17 Apr 2008 21:51:12 -0400, ecarecar <ecarecar@yahoo.com>
wrote:

>Gordon McGrew wrote:
>
>>On Wed, 16 Apr 2008 17:46:40 -0400, ecarecar <ecarecar@yahoo.com>
>>wrote:
>>
>>
>>
>>>Gordon McGrew wrote:
>>>
>>>
>>>
>>>>On Tue, 15 Apr 2008 04:06:26 -0700 (PDT), ACAR
>>>><dimndsonmywndshld@yahoo.com> wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>On Apr 12, 4:49 pm, ecarecar <ecare...@yahoo.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>I am looking for a plot of engine speed vs. fuel consumption. Is one
>>>>>>available anywhere? I am not at all picky about what specific engine.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>I suspect Universities that compete in building very fuel efficient
>>>>>vehicles (esp. hybrids) would have this information available to the
>>>>>public.
>>>>>
>>>>>Marine applications may be a source, too.
>>>>>
>>>>>Maybe Briggs & Stratton has that info. for their lawn mower engines.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>Here is a plot of Brake Specific Fuel Consumption vs. rpm for a VW TDI
>>>>engine.
>>>>
>>>>http://forums.tdiclub.com/showthread.php?t=208125
>>>>
>>>>BSFC is the measure of how much fuel is being consumed per unit power
>>>>generated - a true fuel efficiency measurement. To get an absolute
>>>>fuel consumption rate, you could multiply the BSFC by power at a given
>>>>rpm. Of course this all assumes wide open throttle. If you are
>>>>running at a lower power setting, the absolute fuel consumption will
>>>>be lower. I would guess that BSFC might be higher or lower depending
>>>>on the way the engine is set up.
>>>>
>>>>
>>>>Maybe the OP could tell us exactly what he wants to know.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>This is WOT? Therefore, it is also full throttle ignition advance?
>>>The bottom of the curve is quite narrow.
>>>
>>>
>>
>>Well actually it is a diesel so there is no throttle (my bad) and no
>>ignition. What I should have said is that I assume this curve is for
>>maximum power setting.
>>
>>Again, it is not clear exactly what you are trying to show/learn here.
>>For example, are you interested in fuel consumption at various engine
>>speeds or car speeds?
>>
>>
>>
>I don't know which chart you mean. Not all the cars in the top chart at
>
>http://www.greencarcongress.com/2006...onsumptio.html
>
>are diesel.

I was talking about the chart I linked to above:

http://forums.tdiclub.com/showthread.php?t=208125

(You have to page down a couple times to see it.)