the modification of internal files

[idkman]

so recently i learned to modify the internal files of the engines, but there is something i don't really know how to do...

Is it actually possible to put one engine's exhaust on another engine?

i'd like to know

[Streetwind]

Don't modify internal files - use ModuleManager. That's what it's for!

But yes, you can swap out audio and visual effects on rocket engines. Doing so is fairly work-intensive, as you'll likely have to adjust offsets on the flame to get it to sit in the right location, which requires repeated testing and tweaking. But it can be done.

Look for the EFFECTS { } node in the part config. Most engines have one of them. A few really old ones, like the LV-T30, don't. In that case there'll be some entries directly under the PART { } node. I would recommend patching those out and introducing an EFFECTS { } node if you decide to mod it, as the node can simply do much more than the old way.