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Thread: M1031 to RV tug..

  1. #51
    4 Star General Keith_J's Avatar
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    For water injection, I will need two parameters, engine speed and throttle position, both with 0-5 volt analog output. The latter is easy, GM part 10137417 will fit in place of the throttle vacuum regulator (and will be needed for the eventual 4L80E).

    For engine speed, I am thinking of using the tach lead off the left alternator, then using an RC circuit after rectification, I should be able to construct a 0-5 volt signal proportional to engine speed..0 volt at idle, 5 volts at 3600 RPM.

    These two signals will then be fractionally summed (50% of throttle signal plus 50% of RPM) which will then determine the Snow 212 system mass flow rate in water. The fractions will probably need adjusting due to non-linear fuel rate plus volumetric efficiency losses with speed. Low speed high throttle might even need transmission kick down switch input.

    The Goldilock's perfection is bounded by two realities..too much water injection puts the fire out or worse. Too little water and the pistons melt (actually lose strength which is why the top ring rides in a steel channel cast into the crown).
    1986 M1031 SECM.
    1985 MEP 002A
    1974 MEP 026C, eventually converting to electric start.

  2. #52
    4 Star General Keith_J's Avatar
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    Next project is former military equipment related..I have a 28 volt 3kW DC generator (MEP 026A) which will be used to power the RV, using a 3kW inverter and a battery bank. Intend to use PLCs to start the generator when battery voltage drops below 24 volts, then once 28 volts is sensed at the breaker, an actuator closes the breaker. Once battery voltage is over 28.5, the breaker will open and the generator stopped.

    This will easily power the air conditioner on the RV and be a backup for the 1031's electrical system. This way the RV can stay cool while I am out on the trails with the 1031.
    1986 M1031 SECM.
    1985 MEP 002A
    1974 MEP 026C, eventually converting to electric start.

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    joshuak (01-01-2019)

  4. #53
    4 Star General Keith_J's Avatar
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    Switched the horn out to a high low Hella but those are too buzzy. So I am adding Kleinn dual air horns..using a relay so the Hella pair will be on by default, then a switch makes the Kleinns active. I have onboard air, just not always charged tank. I have to fix the leaks and will add another tank. This is the stock PTO powered air system.
    1986 M1031 SECM.
    1985 MEP 002A
    1974 MEP 026C, eventually converting to electric start.

  5. #54
    Sergeant Major Mad Texan's Avatar
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    I installed these and just made jumpers for the second horn... I like the sound! Chrome grill easily removes and the red faces the rad support. Easy upgrade!

    https://wolo-mfg.com/horns/electric-...axi-sound.html

  6. #55
    4 Star General Keith_J's Avatar
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    Plumbed and wired the air horn, LOVE IT. 150 dB and a great sound. Got the trailer wiring harness perfected, had to run two more circuits through the 12 pin NATO, then modified a trailer harness to a 7 way RV socket. Tested brakes and 12 volt supply. All directional and lights are as designed.

    Had a hidden coolant leak, my fault for not torquing a pipe fitting adequately. Now the system holds pressure and retains coolant. I now use anaerobic thread sealant on all pipe threads.

    Now onto the Snow water injection system! Decided to go with a two injector setup, one on each plenum. Going to drill and tap the floor so the spray is opposite the direction of airflow to assure mixing time. This will better hide the system.

    Now making a remote throttle position sensor (0-5 volt output) and designing a 0-5 volt tachometer sending unit. Both will also be needed for the eventual 4L80e transmission. Since I will be mixing both signals, impedance of the Snow injection module does not matter.
    1986 M1031 SECM.
    1985 MEP 002A
    1974 MEP 026C, eventually converting to electric start.

  7. #56
    4 Star General mkcoen's Avatar
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    I'm back from ID so the shop is officially opened for business again but I'm sicker than a dog so you might want to work alone if you need it for anything.
    KG5RKO
    1954 M37
    1955 Austin Champ
    1980 M116A2 MEP003
    1995 M105A3

    US ARMY - Overlanding since 1775




  8. #57
    4 Star General Keith_J's Avatar
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    Default Tranquility Base here. The Eagle has landed

    0123191346.jpg

    Pulled fine stock. Now it won't work well in hills, 50 more ponies under the hood and an extra gear ratio or two would be great. EGTs were under 1000 in third gear. Definitely could use more fuel.

    Most importantly, it stops on a dime. Only because it has trouble getting over that dime I kid! Acceleration to 45 not a problem, its that gap from 2nd to 3rd. The future TCI 6X will greatly assist with lower first (2.97:1) and two more ratios evenly split.

    Hitch height appears high in the above image, it is within 1 inch measured on trailer frame rails. Height is below the axle centerline. The hitch is Class V with weight distribution. Tongue weight is 740 pounds, the weight distribution bars are over capacity at 1000 pound tongue weight. Running 75 PSI on the rear air springs, no change in rear height with the weight distribution system.
    Last edited by Keith_J; 02-20-2019 at 13:35.
    1986 M1031 SECM.
    1985 MEP 002A
    1974 MEP 026C, eventually converting to electric start.

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    joshuak (01-26-2019), M813rc (01-26-2019)

  10. #58
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    Keith, a question if you don't mind. What EGT are you seeing at idle?

  11. #59
    4 Star General Keith_J's Avatar
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    Quote Originally Posted by joshuak View Post
    Keith, a question if you don't mind. What EGT are you seeing at idle?

    Usually 230 F and lower after 20 seconds or so of street driving. Just starting up? 180 F.

    I have been using EGT to help economy, trying to keep the temperature under 600F on the highway.
    1986 M1031 SECM.
    1985 MEP 002A
    1974 MEP 026C, eventually converting to electric start.

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    joshuak (03-07-2019)

  13. #60
    dumpsterlandingfromorbit! gimpyrobb's Avatar
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    Under 600 while towing?!

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