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> New 'Hobby' Project, carb tuning gone high tech
ww914
post Nov 17 2013, 09:00 AM
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I love gauges. The more the merrier, but I m running out of room. Good work Mark!

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McMark
post Nov 17 2013, 10:33 AM
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(IMG:style_emoticons/default/headbang.gif)

I can't believe I'm still getting the 'use the tube and water method' posts. I thought I was pretty clear. I'm not asking how to sync carbs. I'm sharing my project that I've already decided to build and am nearly halfway done with. (IMG:style_emoticons/default/rolleyes.gif)

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I have one of those I've never used because it's so impractical. I'm sure it would work just fine, but I'm hoping for something that can be used while driving as well.
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euro911
post Nov 17 2013, 11:57 AM
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Stick to your guns, Mark (IMG:style_emoticons/default/aktion035.gif)
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ConeDodger
post Nov 17 2013, 12:14 PM
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QUOTE(McMark @ Nov 17 2013, 08:33 AM) *

(IMG:style_emoticons/default/headbang.gif)

I can't believe I'm still getting the 'use the tube and water method' posts. I thought I was pretty clear. I'm not asking how to sync carbs. I'm sharing my project that I've already decided to build and am nearly halfway done with. (IMG:style_emoticons/default/rolleyes.gif)

From Post #12
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I have one of those I've never used because it's so impractical. I'm sure it would work just fine, but I'm hoping for something that can be used while driving as well.



For the record, Mark has one of those tube and water methods leaning against the wall. He's been there, done that... (IMG:style_emoticons/default/dry.gif)
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SirAndy
post Nov 17 2013, 12:48 PM
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QUOTE(McMark @ Nov 17 2013, 08:33 AM) *
I can't believe I'm still getting the 'use the tube and water method' posts.

Can't you just sprinkle some water on your circuit board? That should work ...
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gothspeed
post Nov 17 2013, 02:41 PM
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QUOTE(McMark @ Nov 16 2013, 09:28 PM) *

Started working on this project this weekend. Got the board soldered, ran the test code to make sure it worked, then started working out the layout. Runs pretty fast and seems like it'll work well.

This is just with random values.

https://www.youtube.com/watch?v=3pBbAG4x0P0


Now I need to start working on averaging. Feel free to post detailed averaging formula/code/links.

This is a great idea McMark (IMG:style_emoticons/default/smilie_pokal.gif) ! It would be useful for any engine using individual butterflies per cylinder or per cylinder bank not just carbs (IMG:style_emoticons/default/smile.gif).

I currently use individual vacuum gauges for each cylinder but I know there is some variation to each of the bellows inside of each gauge. So something like this should theoretically have less variation. What do you think the price point would be on a 4 channel sensor system? (IMG:style_emoticons/default/idea.gif)
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02loftsmoor
post Nov 17 2013, 08:11 PM
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I used Mercury Sticks to balance my Motor cycle carbs works great.. it's only about 24" long
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r_towle
post Nov 17 2013, 10:00 PM
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Cool project.
To bad the sensors are so large...
Would be nice to have the whole system hidden.
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ConeDodger
post Nov 17 2013, 10:29 PM
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QUOTE(r_towle @ Nov 17 2013, 08:00 PM) *

Cool project.
To bad the sensors are so large...
Would be nice to have the whole system hidden.


He plans on hiding it in a tool cabinet. Tuning tool... (IMG:style_emoticons/default/smile.gif)
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Dave_Darling
post Nov 17 2013, 10:33 PM
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I'm still really liking Mike B's idea of using multiple air-flow meters...

--DD
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gothspeed
post Nov 17 2013, 10:37 PM
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QUOTE(ww914 @ Nov 17 2013, 07:00 AM) *

I love gauges. The more the merrier, but I m running out of room. Good work Mark!

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Are those 4 temp readings air intake temps?
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Andyrew
post Nov 17 2013, 11:15 PM
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That is awesome! Would be great for bikes... Hard to do many things at once, especially with 4 carbs..
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McMark
post Nov 17 2013, 11:15 PM
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QUOTE(r_towle @ Nov 17 2013, 08:00 PM) *

Cool project.
To bad the sensors are so large...
Would be nice to have the whole system hidden.

I found small sensors I'm going to try.
Not my hands. (IMG:style_emoticons/default/icon8.gif)


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r_towle
post Nov 18 2013, 07:34 PM
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Can you use an airflow sensor for what you are doing?
At the end of the day, it's a wire suspended across a tube/cylinder.
Seems you could cut that down to an inch or less in height..
Or incorporate it into a velocity stack.

I do love the idea...
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Spoke
post Nov 18 2013, 09:37 PM
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Looks pretty cool.

We've used Arduino for several projects. I did an interface board to Arduino for a customer.

Let me know if you need any help with a design or a PCB.
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ww914
post Nov 19 2013, 08:24 AM
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QUOTE
Are those 4 temp readings air intake temps?
No they are aircraft cylinder head temps gauges with a sensor under each spark plug. This is an old photo. I now have an oil temp gauge as well on the bottom. Sorry, I messed this post up.
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stugray
post Feb 9 2014, 01:03 PM
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Mark,

I thought about another excellent use for your arduino project:

http://www.arduino.cc/en/Tutorial/KnockSensor

&

http://www.ebay.com/itm/E46-bmw-m3-s54-kno...093&vxp=mtr

Your arduino should have 6 Analog inputs.
SO you should have two left.
You could put one knock sensor on each head.

I am also playing with a arduino that could be used for variable ignition timing. It would have a programmable advance curve based on RPM.
Then you could make it change timing based on:RPM Manifold pressure (load) and input air temperature.
If you had the knock sensor, it could retard timing if knock is detected.
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AE354803
post Feb 10 2014, 11:44 AM
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QUOTE(McMark @ Nov 17 2013, 09:15 PM) *

QUOTE(r_towle @ Nov 17 2013, 08:00 PM) *

Cool project.
To bad the sensors are so large...
Would be nice to have the whole system hidden.

I found small sensors I'm going to try.
Not my hands. (IMG:style_emoticons/default/icon8.gif)



Nice project. I'm surprised how well it is reading the individual vacuum pulses.

Just a thought, if you are having issues with filtering/averaging the vacuum waveform into a stable value, adding a length of tubing between the manifold and the sensors should help equalize the pulse, especially if there is a reservoir of some sort in that line.
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jfort
post Feb 10 2014, 12:22 PM
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interesting. and I had as a winter project an attempt to tune the Webers on my six. Now I think I should wait and watch this thread.
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McMark
post Feb 10 2014, 03:52 PM
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Haven't had a carb'd car in to do any more testing with it. I added some filtering by throwing out values that are some percentage different than the last 'real' value. So it would basically limit the indication from moving beyond a relatively small range.

I really need a daily driver with carbs on it to really test this out.
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