Does anyone know what those horns on an f1 engine are and what they do? I haven’t seen em before on any other type of car.
by Matte_Kudasai82
Does anyone know what those horns on an f1 engine are and what they do? I haven’t seen em before on any other type of car.
by Matte_Kudasai82
![1971 GMC Jimmy [4267x2844]](https://www.evshift.com/wp-content/uploads/2026/02/0oi0omhldclg1-770x515.jpeg "1971 GMC Jimmy [4267×2844]")
![Red down to the socks [wraith]](https://www.evshift.com/wp-content/uploads/2026/02/8njuvv1fublg1-770x515.jpeg "Red down to the socks [wraith]")
![[McLaren Senna GTR] in Miami. Casually street parked outside a gym.](https://www.evshift.com/wp-content/uploads/2026/02/1771886656_d8kakngpmblg1-770x515.jpeg "[McLaren Senna GTR] in Miami. Casually street parked outside a gym.")
2 Comments
They’re called velocity stacks and do as the name suggests, they increase the velocity of air moving into the engine. [Garage 4age](https://youtu.be/G8L9_XO3iCw?si=Obz_TAx1z_CW3JHN) did some testing with 3d printed ones if you want to learn more.
They’re basically only used on naturally aspirated applications and are usually hidden by a filter, which is likely why you might not have seen them before.
Velocity stacks on ITB (individual throttle bodies). Instead of a a single air box/air intake which feeds air into the engine cylinders via a manifold that distributes the air into each cylinders. This bypasses all that by placing an individual throttle body “on top” of each cylinder to quickly feed the engine air directly.
These stacks allow for more of a rush of air at low RPMs via physics, but sacrifice high RPM performance (where you want shorter stacks). Cool story, [Mazda’s old 787B race car had variable intake stacks](https://www.roadandtrack.com/car-culture/a36062874/mazda-787b-r26-variable-length-intake/), like here, to combat this design flaw, and had great success.