Stop guessing at facts.

[Phil Lamovie]

Hi All,

I really must protest !

There is a very large amount of misinformation being posted to the
list
of late.

> Stoich is the point where all of the fuel inhaled by the engine is
combined
> with all of the available oxygen in the cyl. Any leaner means less
than
> optimum power. Any richer means less than optimum power per lb of
> fuel  used, as some is not burned, as well as less power overall.

This is but a mild example.

1.0 " Stoich is the point... Not True ! Stoich is only the ratio of
required air
        to ingested air the quality of combustion is not in any way
relevant.

2.0 " Any leaner means.... Not True ! Optimum power is not an
    engineering concept.  It is neither peak power, peak torque or
peak
    efficiency. Nothing of interest happens at stoich because it is
only
    theoretical. Most engines need 15 to 20 % more fuel than stoich to

    make peak power and 10% less to make peak efficiency.

The problem I have with all of this is that our topic is 100% physics
yet
many of the posts seem to not be happy with this state of affairs.

As a designer of engine management systems I joined the list to give
some support to the emerging designers of tomorrow's ECU's.

I know it's worthwhile because I just hired someone who had only
learnt
what he new from the web and I have had to spend 4 months unlearning
most of what he knew about engines and EFI.  On the other hand he
learnt his electronics from hobby magazines all of which are chock a
block with facts and data.

As a result of this his programming and board design skills are
frightening (or I'm simply getting older) and now he knows what he is
doing with engines the results are excellent.

The problem remains that as long as the list is a home for risky
physics and those who have real working answers are less inclined to
contribute as they know that the readers/lurkers will have great
difficulty
sorting fact from fiction.

Scott is a good case in point. His very gentle reply seeks to point
out
that there are a myriad of factors involved but with some careful
sorting you can arrive at the salient facts.

Instead of a response discussing these  facts there were many follow
up
post that not only ignored his points but suggested many new and
different scenarios.

Scott ended with back to lurk mode and I'm fairly sure (0.7) that I
understand why.

Yours in the pursuit...

Phil
Injec Racing Developments

And just a hint to John. The limiting factor is your first choice of
max pw
at 12.8 and second 7000 rpm has a max pw of 7.57ms.