Engine

Engine is a Quirk used by Tenya Iida.

Description
Tenya's Quirk grants him incredible speed through engine-like protrusions manifested around his calves. Those engines give Tenya massive leg strength, allowing not only fast running abilities, but also increased kicking power. Consequently, Tenya's fighting style ends up revolving around kicks.

His engines are apparently fueled by orange juice, while carbonated drinks make them malfunction. Furthermore, he can adapt to the situation at hand by switching between gears. There are at least three confirmed gear settings, but he needs to go through each one in proper order as he accelerates further. Tenya is seen thinking that he could only switch up to third gear for a 50-meter dash, implying he needs more distance to achieve his maximum speed.

Jamming the mufflers of the leg engines will cause them to stall. The same thing will happen once he activates his Recipro Burst move, as a trade-off for a short-timed, but immense burst of speed.

Named Techniques

 * Recipro Burst (レシプロバースト): This move allows Tenya to forcibly accelerate his Quirk, greatly enhancing his speed for 10 seconds but at the cost of disabling his engines for a short period of time. Even Shoto Todoroki could not fully evade Recipro Burst and admits that he expected no less of its incredible speed.
 * Recipro Extend (レシプロエクステンド): After Tenya manages to cool down the negative effects of Recipro Burst, he regains even more acceleration than before.

Trivia

 * This Quirk is similar to Jet, as both grant the user propulsion devices in their lower bodies that provide enhanced speed. The main difference is that in Jet they are located at the bottoms of feet and provide enhanced jumping, while in Engine they are located in the lower leg and provide enhanced running.