How do you add new unique engines?

Hey guys. had the game for a long time and every time i try to get into messing with files I get stuck and give up. I want to make some more powerful engines for cars, I can successfully edit the existing engines power but I want to keep the original engine and just have a more powerful one i can select as a part.

For example, I've got the burnside, I've copied the burnside.zip to my mods/vehicles folder and edited the engine.jbeam to have a second engine with a slightly different name but with the mod enabled it still doesn't come up? I've basically just copied the code for the v8 and pasted it below and changed the title and name under information. I've also tried changing the value to see if that helps but it doesn't seem to have.

I'm obviously doing something wrong adding the second engine or my zip is in the wrong spot. Can anyone help??

 

So I copied Burnside.zip to my mods/vehicle folder, then unpacked it using the function in the game. Now the file path is K:\BeamNG.drive\mods\unpacked\burnside\burnside\vehicles\burnside which seems awfully redundant and weird.
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Think i've got it sorted, I'm just making a new engine.jbeam and changing some names and it comes up as a new motor. all good
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Can't figure out how to add new transmission though to handle the power, Any ideas?

 

what I've been trying is opening up one of the engine.jbeams copying the code for the burnsides 3 speed manual and pasting it at the bottom of the jbeam file and tweaking stuff, but this causes the burnside to be invisible when i load it and not work, as well as the transmission not showing up in the part picker anyway.

 

make sure the {} and [] s in the jbeam open and close
for example

Code:

{
"burnside_Custom_bumper_F": {
    "information":{
        "authors":"BeamNG",
        "name":"Front Bumper",
        "value":250,
    }
    "slotType" : "burnside_bumper_F",
    "slots": [
        ["type", "default", "description"]
    ],
     "flexbodies": [
         ["mesh", "[group]:", "nonFlexMaterials"],
         Insert mesh here
     ],
     "nodes": [
         ["id", "posX", "posY", "posZ"],
    Insert Nodes here
    ],
    "beams": [
          ["id1:", "id2:"],
          Insert beams here
    ],
}
}