The easiest way to do that kind of engine glow is in a 3D app so you can get a 3D cone that can be textured to look like a glow and have some particles moving.
You can kind of fake it in After Effects with an animated shape layer with blur, some kind of noise, maybe Glow, and some blend modes. If you used a 3D layer, create several copies that were offset by 30 or 45º, then spin them fast with motion blur turned on you could get a fairly convincing rocket motor. A 2D shape layer with these effects and settings will give you the animated flame. The screenshot shows you everything I did to the shape layer.
Pre-composed, turned into a 3D layer parented to a 3D to spin it, duplicated, and rotated with motion blur, then attached to a position null will give you something like this. It is not going to render very quickly but it looks like a 3D rocker engine.
If you don't have any idea what I did in those screenshots please spend some time with the User Guide.