Chuck wrote:
"Geir Holmavatn" wrote in message
...
Hi,
Have all those good ol' 2" fuel flow instruments with separate sensor
been wept off the market and replaced by cruise control computers..?

Anyone knowing where to find a fuel-flow meter with sensor for gasoline
with display in European units: milliliters per minute or liters per
hour..?

Thanks for tips and comments

geir

Hi,

Fuel flow is porportional to the Duty Cycle of the injector signal. A volt
meter across across an injector will give you uncalibrated fuel flow,
Assuming the time delay to open is = to the closing delay and the waveform
is square. Web search indicates typical wave form is sq. with a 70v
inductive kick. Current rise time ~1.5ms so I guess the on time is long
resulting in a positive offset. Anyone know how = the times are? The
injectors take .6A so I'd start with a 470 ohm R and a zener or LM431 to
filter battery changes. For relative calibration: connect across battery =
100%. Good enough for my needs: check effect of tire change, syn oil, wax
job, etc..

Check http://www.robietherobot.com/storm/f...ectorguide.htm for injector
flow rates and discussion of on/off delay..

Chuck


What's an injector? Some of us don't have 'em and still want a diy fuel
metering system.

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