How to make custom engines effects?

[magoigor]

I just made a engine, and everything works perfectly, but, the default ksp engine effects are too small for it, I couldn't figure a way to make a engine effect with part tools, also didn't find any tutorials... if theres any documentation or tutorial on that, i would be very thankful :p.

[wasml]

I haven't looked this over closely but it may be what your looking for:

Last part of the OP talks about creating a plume.

Edit: One note - the plume in Unity often (always?) looks quite different than it does in game