Do you mean engine shape or the fire coming from?
Btw, have you passed Art Tools tutorial? It covers all important parts of model making, and at least gives you a terminology base to simply let you express your thoughts and ask precise questions.
Fire is made with particles, check "Particles" part of Art Tools tutorials.
You know what? You're an asshole. DJYVG wants a tutorial, step by step how to do a fire and instead you're giving him a bunch of step by step tutorials which also explain how to do a fire. How could one be so not precise?
Ambiguity found between sarcasm, irony and trolling. I wouls cast a "teleport to troll punishment corner for an hour" spell on you.
Try this 0.0