Home Technology Top Fuel V8 Engine Working Principle

Top Fuel V8 Engine Working Principle


Top Fuel is a type of drag racing whose dragsters are the quickest accelerating racing cars in the world and the fastest sanctioned category of drag racing, with the fastest competitors reaching speeds of 338 miles per hour (544.0 km/h) and finishing the 304.8 m runs in 3.62 seconds.A top fuel dragster accelerates from a standstill to 160.9 km/h in as little as 0.8 seconds and can exceed 478.0 km/h in just 201.2 m.

source.image: Ft-share International

The engine used to power a Top Fuel drag racing car is based on a second generation Chrysler RB Hemi, but is built exclusively of specialized parts, it retains the basic configuration with two valves per cylinder activated by pushrods from a centrally-placed camshaft. The engine has hemispherical combustion chambers, a 58-degree in. to ex. valve stem angle; 4.8 inches (121.92 mm) bore pitch.Watch the video from Ft-share International:

The block is machined from a piece of forged aluminum. It has press-fitted, ductile iron liners. There are no water passages in the block, which adds considerable strength and stiffness. The engine is cooled by the incoming air/fuel mixture and the lubricating oil. Like the original Hemi, the racing cylinder block has a deep skirt for strength.The supercharger must be a 14-71 type Roots blower. It has twisted lobes and is driven by a toothed belt. The supercharger is slightly offset to the rear to provide an even distribution of air.


Absolute manifold pressure is usually 56–66 pounds per square inch , but up to 74 pounds per square inch is possible. The engine power output can also be calculated based upon the car’s weight and its performance. The calculated power output of these engines is most likely somewhere between 8,500 and 10,000 hp,which is about twice as powerful as the engines installed on some modern diesel locomotives.In late 2015, tests using sensors developed by AVL Racing showed peak power of over 11,000 hp.