[Diy_efi] Intro, and q's about fuel economy

[James]

Hello everybody.

My name's James.  I'm a junior in EE.

I've joined an extracurricular vehicle team to have some fun in college.
I love cars and I love electronics, so it works out well.  :-)

The task at hand is to build a fuel injection system for a lawnmower
engine, single cylinder, probably L-head (possibly custom ohc head).

Most of y'all seem pretty friendly and knowledgeable, so I thought I'd
go out on a limb, admit I'm trying to become an engineer, and see whether
anyone with experience had any suggestions.

The curious can see what I've accomplished so far at
http://splorg.org/~jester/smv/  Sorry about the load times, I have slow
dsl.  And if you can't connect, the rain pro'lly knocked the power out
(again).

The only real purpose of the project is to get the best gas millage
possible.  We'd like to use EFI to get precise control over the
stoichiometry of the fuel mixture.

I've read that the most efficient ratio is 17:1.  Does anyone know whether
this number is applicable to all engines, and how much (quant or
qualitatively) economy you lose when you stray from this?

Also, I think we need a lean burn oxygen sensor to accomplish this...
anyone agree or disagree?  Any parts recommendations?

Cheers,

-james


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