Alternative Power sources - gas vs. diesel, was: Toyota's All hybrid Dreams

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gas vs. diesel, was: Toyota's All hybrid Dreams

danny burstein

2005-10-13, 8:21 pm

In <2nB3f.5902$Hm3.5073@fe09.lga> Steve Spence <sspence@green-trust.org> writes:

>Diesels get better mileage (20% or so) than equivalent gasoline engines.
>Due to two factors:

>1. More BTU in the fuel
>2. Higher combustion efficiencies due to higher compression, leaner burning.

Does that "leaner burning" difference still apply when looking
at the more modern gasoline engines that claim
to be, cough cough, "lean burn" ?

(honest question... it wouldn't be the first
time marketing types, err, exagerrate...)

--
_____________________________________________________
Knowledge may be power, but communications is the key
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Steve Spence

2005-10-13, 8:21 pm

danny burstein wrote:
> In <2nB3f.5902$Hm3.5073@fe09.lga> Steve Spence <sspence@green-trust.org> writes:
>
>
>
>
>
>
> Does that "leaner burning" difference still apply when looking
> at the more modern gasoline engines that claim
> to be, cough cough, "lean burn" ?
>
> (honest question... it wouldn't be the first
> time marketing types, err, exagerrate...)
>
even a "lean burn" gas engine doesn't have the volumetric efficiency of
a diesel, or the extra btu that the diesel fuel contains.

--
Steve Spence
Dir., Green Trust, http://www.green-trust.org
Contributing Editor, http://www.off-grid.net
http://www.rebelwolf.com/essn.html

Arnold Walker

2005-10-14, 4:21 am

"Steve Spence" <sspence@green-trust.org> wrote in message
news:1QB3f.5914$Hm3.1389@fe09.lga...
> danny burstein wrote:
writes:[color=darkred]
burning.[color=darkred]
> even a "lean burn" gas engine doesn't have the volumetric efficiency of
> a diesel, or the extra btu that the diesel fuel contains.
>
> --
> Steve Spence
> Dir., Green Trust, http://www.green-trust.org
> Contributing Editor, http://www.off-grid.net
> http://www.rebelwolf.com/essn.html
The diesel's fuel ratio varys from about 140:1 at idle to almost
14:1 at max. power.
The gas engine is fixed at about 14:1 idle thru max power.
Not even Cvcc honda or strafied charge gas engine can burn
as lean as a diesel.
As a matter of fact,you don't want a diesel run too rich.
Had many a trucker come in wanting you to turn up the setting.
And runs like a Champ until you get pyro readings of 1300F.
And fry the engine. Like in the old VW rabbit pushed past 55mph(3600rpms)
for any
length of time.

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Dave Hinz

2005-10-14, 11:21 am

On Thu, 13 Oct 2005 22:54:40 +0000 (UTC), danny burstein <dannyb@panix.com> wrote:
> Does that "leaner burning" difference still apply when looking
> at the more modern gasoline engines that claim
> to be, cough cough, "lean burn" ?

I don't know how they can make this claim. 14.7:1 is just about exactly
the correct ratio of air:fuel in a gasoline engine. Leaner, you get
oxides of nitrogen and lose power and efficiency. Richer, you get
unburned hydrocarbons and lose power and efficiency.

> (honest question... it wouldn't be the first
> time marketing types, err, exagerrate...)

Yup. The ratio has been worked out for decades. Haven't seen the
specific marketing crap you mention but I'd love a pointer for
entertainment value.

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