Re: [AMC-List] Fuel Injecting the big dogs

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: Tom Jennings <tomj@xxxxxxx>
" 
" 
" 
" That's really good news -- I'd never heard of anyone running
" open-loop *FI successfully.

until the '80s, all efi was open loop.

my family had two '71 saab 99s, one with carbs and one with the
original bosch jetronic first used on the '66 vw squareback and afaik
based on bendix patents [remember the '57 rambler rebel?] bosch bought.
the engines were identical save for induction.

the efi car got almost 10% more power, better mileage, better
driveability, and ran on lower octane than the carb car.  the only
problem we ever had with it was the engine temp sensor; when that
failed the idle speed would 'hunt' up and down in cold weather until
it warmed up.  other operation was not affected.

" Even carbs are not exactly "open loop"; fuel flow is proportional to
" airflow plus and minus.

not linearly proportional or carbs would be a lot simpler.  iirc vac
in a venturi - which is what pulls the fuel through the jet - is
proportional to the square of the air velocity.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh@xxxxxxxxxxxxxxxxx                       and think what none thought
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