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

In article ,
Geir Holmavatn wrote:
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

They're not any use with injection as the fuel runs in a loop sending
unused back to the tank. And at high pressure. The normal way these days
is to count injection pulses and duration.

--
*Can vegetarians eat animal crackers?

Dave Plowman London SW
To e-mail, change noise into sound.

On Mon, 14 Jan 2008 19:59:47 +0000 (GMT), Dave Plowman (News) wrote:
In article ,
Geir Holmavatn wrote:
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

They're not any use with injection as the fuel runs in a loop sending
unused back to the tank. And at high pressure. The normal way these days
is to count injection pulses and duration.

I suppose you could employ two (2) in-line sensors -- one on the supply
side, and one on the return side and subtract the return flow from the
supply flow in the u-processor. (I'm assuming the project used a
MicroChip [or similar uP) thingy.)

Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
38.24N 104.55W | @ config.com | Jonesy | OS/2
*** Killfiling google posts: http://jonz.net/ng.htm

In article ,
Allodoxaphobia wrote:
On Mon, 14 Jan 2008 19:59:47 +0000 (GMT), Dave Plowman (News) wrote:
In article ,
Geir Holmavatn wrote:
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

They're not any use with injection as the fuel runs in a loop sending
unused back to the tank. And at high pressure. The normal way these
days is to count injection pulses and duration.

I suppose you could employ two (2) in-line sensors -- one on the supply
side, and one on the return side and subtract the return flow from the
supply flow in the u-processor. (I'm assuming the project used a
MicroChip [or similar uP) thingy.)

The site Trevor gave in a later post says it can work by either counting
injector pulses or a flow device.

Jonesy

--
*Those who live by the sword get shot by those who don't*

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in message
...
In article ,
Allodoxaphobia wrote:
On Mon, 14 Jan 2008 19:59:47 +0000 (GMT), Dave Plowman (News) wrote:
In article ,
Geir Holmavatn wrote:
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

They're not any use with injection as the fuel runs in a loop sending
unused back to the tank. And at high pressure. The normal way these
days is to count injection pulses and duration.

I suppose you could employ two (2) in-line sensors -- one on the supply
side, and one on the return side and subtract the return flow from the
supply flow in the u-processor. (I'm assuming the project used a
MicroChip [or similar uP) thingy.)

The site Trevor gave in a later post says it can work by either counting
injector pulses or a flow device.

**Correct. It's a bit fiddly, but more accurate actually measuring the fuel
flow. I ended using the pulse counting method myself (I didn't care much for
mucking about with fuel lines), but I did have two fuel flow meters, which
came with the computer. One was plastic, the other a substantial die-cast
affair. Accuracy was pretty impressive, according to the manufacturer's
data.

Trevor Wilson

In article ,
Trevor Wilson wrote:
The site Trevor gave in a later post says it can work by either
counting injector pulses or a flow device.

**Correct. It's a bit fiddly, but more accurate actually measuring the
fuel flow. I ended using the pulse counting method myself (I didn't
care much for mucking about with fuel lines), but I did have two fuel
flow meters, which came with the computer. One was plastic, the other a
substantial die-cast affair. Accuracy was pretty impressive, according
to the manufacturer's data.

I must admit to being surprised. Both my cars are injection and both use
the pulse measuring system to calculate MPG and both are very accurate.
Years ago I did have an aftermarket one that measure fuel flow and it
wasn't.

--
*Never kick a cow pat on a hot day *

Dave Plowman London SW
To e-mail, change noise into sound.

"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

**Here is an article published in and Australian magazine which describes a
car computer:

http://www.siliconchip.com.au/cms/A_102510/article.html

None of the local suppliers supports the kit any longer. However, as I
recall, the kit was designed by a contractor to the magazine. As a
consequence, that person probably can assist with stuff like sensors, PCBs,
programmed microcontrollers, et al. You will probably need to purchase the
article to ascertain the details. Or perhaps a polite email to the publisher
may elicit the contact details of the author.

Good luck. I almost built one, but found a (second hand) commercial device
at a very good price first. I do recall that the design was most impressive.

Trevor Wilson

"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

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..



Look up Megasquirt, it's a DIY fuel injection system and related sites have
all the information you could want about injector pulsewidths.

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.

--
Return address is VALID!

"mike" wrote in message
news:BSgjj.10943$W73.4010@trnddc04...
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.

**Then you need a fuel flow sensor.

Trevor Wilson

In article BSgjj.10943$W73.4010@trnddc04,
mike wrote:
What's an injector? Some of us don't have 'em and still want a diy fuel
metering system.

Then I'd ask why. Wanting fuel metering suggests you're concerned with MPG.
Converting to injection will improve this.

--
*I don't suffer from insanity; I enjoy every minute of it.

Dave Plowman London SW
To e-mail, change noise into sound.