Hi, I am the Wandering Wendigo, and discovered a unique engine that requires "no fuel" to function in my experience in "Road to Gramby's" that has the same potential strength as the normal engines we use today. How it works is that it uses "Leaf Blowers" and for them to function as an engine, a player must be in range of the leaf blower attached to the vehicle you want to move. Say for example you're in a seat in range of the leaf blower and you activate the leaf blower. It pushes on you and the game thinks you're an individual entity the leaf blower wants to move, therefore it moves you yet you're in the seat keeping you attached to the build, but the build and the player are not considered a singular entity or object, therefore it pushes on you which pushes on the vehicle, causing it to go forwards, here's an image of what that would look like, and how you could set up your build.
How to wire it up: 1 Single wire, or button going from the input source to the "leaf blower" "Pointed towards" the player in a "Seat", so it can be very stable Apon being activated to push the entire build forwards.
There are some notable differences that make this engine good in some situations but with more research on how it can be applied, Some Cons or Pros could be different depending on how you set it up, but these observations are based on how i applied it.
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Fuel-less Leaf Blower Engine
Pros: Has the Strength of the fuel drinking thrusters, only requires a Signal from a wire to function , can be stacked like normal engines
Cons: They are incredibly noisy the second its activated (Please lower your volume if you're using it this way) , Has a long trail of particles which can be a pain if your being pursued by another player with the same speed as you.
(Only Works if the Player is in range of the leaf blower)
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But I do have a theory on how you can manage this and make separate engines that don't require an active player per engine, but it may not be true but that is for me or "You" to discover.
Theory: Have a body of a player that freshly respawned via your Buddy or yourself, but this was hard for me to replicate. Put the Body of the deceased player in front of the Engine's path to act like the player is still in the seat, but this might not work due to the player's corpse and the build becoming a singular entity the second of being connected to each other. but it its worth giving a try, if you manage to prove the theory wrong or right, or if I find out, let me know so i can try to figure out or think another way to make it work. So, i can update the design and post a more modified engine for you guys to use.
Here's a visual description on what it might look like, or how to hook it up.

For the input sensor, just set it to any keyboard button you want to be the forward button.
Enjoy!
Or for those who want the code to play with it yourself, here you go.
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CONTROLS: Use the "W" key to activate the engine.
Big brain
Hello. I would like you to work on my manual for engineering for this game. Contact me at th3impasta300@gmail.com
did you write a 5000 word essay just for this build