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#76
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Your results are to be expected. To get actual oil sump temperature, the sensor has to be in direct contact with the oil. I would suggest drilling the drain plug with a through hole and epoxy the sensor in place extending 1" into the oil.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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It still wouldn't be in direct contact with the oil... the sensor chip is encased in a plastic or ceramic package and that is encased within a metal sheath and possibly in some epoxy as well. So I guess I'm just screwed. I'll just ignore the actual reading and focus just on the relative readings.
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#78
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Look at the coolant temp sensors and switches, they are placed deep into the coolant. The way you have the sensor halfway in the oil drain plug, it could never reach equilibrium with the oil, temperature wise because the oil pan and drain plug is being cooled by ambient air. If you think you are measuring actual oil temp, then you need to investigate why it is so low.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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But your point of low temperature reading is beginning to look like a valid concern. I had kind of expected to see ambient temp plus about 15 like I see with the probe on the Arduino and then a rapid increase in temps once the thermostat opened and hot oil went to the cooler when I had the probe mounted on the cooler line, but it didn't. It just rose steadily until it got to 150 or so, and higher temps of 180 or so when pulling up a hill on a warm day. It appears that the thermostats can be replaced, though not terribly easily. I'm wondering if anyone has done so recently. The other thing I'm wondering is how many people are potentially driving around with thermostats stuck open and never know it because they have no oil temp gauge. Or vice versa, with high oil temps because the thermostat is stuck closed and the cooler is never brought into play.
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#80
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Very cool instrumentation project!
I'm curious too about the air intake changes, and valve cover breather you've set up here. Did you do another thread on that project?
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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission. |
#81
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#82
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You Rock
Awesome project.
Two questions #1-What do you estimate you spent in $$$ #2 -Consider selling the whole thing as a kit (minus the display)-sensors, box, etc? I would purchase two |
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#2 No
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Last edited by mach4; 07-25-2015 at 12:05 AM. |
#84
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Pretty please...
Mach your KILLING ME-I must GOTTA have that on my current transplant conversion.
I'll pay cash for a clone Pretty Please! |
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I'm flattered, but I know what's required and there are just too many variables and too much time is involved. I might be convinced to share the Arduino code and discuss in greater detail the strategy and devices I used...but even that would take some doing. It works, but it's not pretty - virtually anyone with coding experience and electronics background could do far better.
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#86
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I'm in the middle of a project to move my engine instrumentation system from the existing prototype/breadboard configuration I used as a proof of concept, to an actual PCB board. At the point I get the design done and a prototype built and tested it would be trivial to order additional boards in quantity for those that would like to assemble, program and install their own EDMS-II (Engine Data Monitoring System II).
As I've said before I have no interest in putting together an actual product because of the countless variables and hassles of support, but a DIY project with pointers and a basic discussion on how to integrate the hardware and modify the code could be doable. The second version EDMS-II), as currently conceived, would include the additional functionality of a micro-SD card for data logging as well as two extra analog sensor inputs for user expansion. To create a working system a user would need to be able to: - source various circuit components - Arduino nano, buck, thermocouple amp, bluetooth, micro-SD, resistors - solder components to PCB - mount in project box and install in engine compartment - source and integrate sensors for temp, fuel pressure, EGT, boost and vacuum etc. - fabricate sensor mounting brackets - wire sensors to Arduino - install Arduino IDE to PC, modify code, upload code to Arduino - install Processing Language IDE and Android extensions to PC - source suitable Android tablet - configure PC-Android connection - modify code to fit screen, edit screen images and upload to tablet - install tablet in vehicle as desired I'd simplify the software to only provide one or two digital display screens making it easy to adapt to different tablets for those unfamiliar with coding. I'd also take time to comment and clean up the Android and Arduino code to make it easier to understand what's happening. I'd also envision a forum for users to share extensions and solutions to their particular installations, such as additional display screens and installation solutions. Anyone interested? I'm asking now because it's a little different making a board for just me to use and one that others will be using and whether to actually start cleaning up code. A rough cost breakdown would look something like - EDMS-II PCB - $30-50 k-Thermocouple - $12-30 MAX31855 breakout - $20-30 1 bar MAP - $1-20 3 bar MAP - $1-40 fuel pressure sensor - $20-35 temp sensors - $2-5 ea tablet with bluetooth - $30-200 resistors - $1-4 power supply - $4-10 HC-05 bluetooth - $10-20 MicroSD - $ 5-10 project box and connectors - $10-25 tablet power source - $5-15 This is not a trivial project. Each sensor poses unique engineering challenges. For example EGT requires drilling and tapping exhaust manifold or turbo inlet pipe. Oil temp could involve drilling oil drain plug or fabricating a clamp on the oil cooler line - and so forth. A virtually unlimited number of temp sensors can be used without hardware modification.
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#87
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I'm in.
where do you want me to paypal?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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would you like me to set up a subforum for discussion of the details?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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Let's wait a bit... Let me finish the PCB design and testing and see if there's an appropriate level of interest.
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#90
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interest is no problem... gathering it together is the key I think.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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