On the other hand this is a dying technology and new
fuel sources are popping up every day. Good riddance I
say. There is a plant that is producing ethanol not far from
where I live that uses straw for its fuel source and getting
funding from a normally conservative provincial
government.
Of course the political front-men for the car
manufacturers, and "Big Oil", will try and quash any
attempts to develop alternative non-poluting energy
sources but their demise is as sure as Jaquard
looms or Stanley Steamers.
Lawrence
On 15 Jan 2003, , Hans Franke wrote:
> > Damn,
> > You can't hardly find higher than 93.5 or so here in
> > Colorado... < jealous of those who can get 100 octane at
> > the pump. Sure, my car needs only 87, but if I could get
> > higher octane gas I could drive a car with higher
> > compression ;p
>
> Well, before compareing Octane numbers we have to define
> what measurement we use. At German stations usualy the ROZ
> is given.
>
> ROZ stands for Research Oktane Zahl. The English/German
> mixup is a historical thing. As far as I know, the whole
> octane calculation was made up by some German scientists who
> did develop the measurements. The result was a calculation
> where the given fuel is compared to a mixture of n-Heptan or
> Trimethylpentan (OZ=0) and Isooktan (OZ=100). Since fuel
> mixtures can be better than Isooktan, numbers higher than
> 100 are possible. The measurement is done with a defined
> standard engine runing at a specific speed, a fixed advance
> angle and an air intake at 50 C.
>
> Anothor number is the so called MOZ (Motor Oktan Zahl),
> where the test series runns at a higher speed and an intake
> temperature of I think 150 C, which is closer to a real
> situation. For modern fuels this number is usualy 8-10 lower
> then the ROZ. For example:
> MOZ ROZ
> Regular 83 91
> Super 85 95
> Super Plus 88 98
>
> US station _in_most_states_ give the POZ (Pump Oktan
> Zahl) which is the average between MOZ and ROZ, so if
> we take the above examples, A German 91 ROZ (lowest
> quality available) would be sold as 87 in the US. These
> numbers are just as rough rule of thumb usable.
>
> Beside ROZ, MOZ and POZ there's also:
>
> SOZ, Strassen (Street) Oktan Zahl, where the tests are
> done with more real profile. One interesting fact is
> thet the SOZ calculations give backing to both, MOZ
> and ROZ. It looks like the ROZ value gives a good number for
> performance during acceleration (for acceleration profiles
> SOZ and ROZ are similar), while MOZ seams to sow the high
> load reaction of a given fuel.
>
> Last there is also the FOZ, Fron Oktan Zahl, where the
> fuel will be distilled, and only the parts with a
> boiling point above 100 C are used for the OZ calculation.
> The idea is to look closer at the volatile parts within the
> mix.
>
> Now, all these numbers are taken from my memory. There
> may be some twists by now.
>
> Gruss
> H.
>
> --
> VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen
> http://www.vcfe.org/
lgwalker_at_ mts.net
Received on Wed Jan 15 2003 - 20:57:15 GMT