Spoon Complete Blueprinted Engine - K20C

Each complete Spoon engine is assembled using all new Honda genuine parts.

The edges of the cylinder block and cylinder head are all deburred to prevent stress concentration and to prevent metal pieces generated during the manufacturing process from falling into the engine. In addition, the assembly weight of the moving parts of the piston, piston pin, and connecting rod is kept within 0.02g for each cylinder. The total weight of these moving parts is approximately 1,100g (K20C), with a difference of 0.002% between cylinders. Since the allowable weight difference of the conventional Honda Type R engine is 0.2%, we are pursuing an even higher precision of 100 times that. Uniform weight of the moving parts reduces imbalance and vibration, leading to a smooth increase in rotation and a pleasant feeling that does not appear in numerical values ​​such as power curves.

Furthermore, clearance management is an important point in engine assembly. The engine combines different materials such as aluminum and iron to achieve both strength and light weight. An iron cylinder sleeve is cast into an aluminum cylinder block, and an aluminum piston is assembled. The crankshaft, camshaft, and intake and exhaust valves are also made of iron and assembled into the aluminum cylinder block and cylinder head. Aluminum and iron have different thermal expansion coefficients, so the clearance changes with temperature changes.
For this reason, the clean room where the engines are assembled is air-conditioned to keep the room temperature uniform, keeping the temperature of parts constant throughout the year and enabling precise clearance management during assembly. Experience the true form of a Honda engine, where high-precision parts are assembled by skilled mechanics in a properly managed environment.

The complete engine package is built entirely with brand new OE parts from Honda. Before assembly, all metal burrs are removed from the cylinder block and cylinder head to avoid possible stress concentration and to avoid engine damage from contamination.
The piston, piston pin and all moving parts of the conrod are carefully weighed and balanced within a tolerance of 0.02g on each cylinder.
The total weight of the moving parts is approximately 1,100g (K20C) hence a tolerance of 0.02g translates to managing the weight difference within 0.002%. Stock Honda Type R engines are built with a tolerance of 0.2%. We've set our bar 100 times higher. Precise weight management of moving parts in an engine helps to decrease minute vibrations, allowing the engine to rev smoothly. The effect may not be visible on a power curve, but it definitely reflects on driving feel.

Another critical factor of building an engine is clearance management. Modern engines are made up of different materials such as aluminum and steel in order to balance durability and weight saving. Cylinder The sleeves are made of steel, cast molded into an aluminum cylinder block and combined with pistons made from aluminum. The crankshaft, camshaft and intake/exhaust valves are made of steel, assembled to cylinder blocks and cylinder heads made of aluminum. Since the coefficient of thermal expansion are different between aluminum and steel, clearance deviates according to temperature fluctuation. At SPOON SPORTS, we take pride in assembling all our engines in a cleanroom, temperature controlled to maintain an environment for optimum clearance management during assembly.

Precision components are assembled in a constant environment by our skilled engine builders. We look forward to delivering the true performance of the Honda engine to our customers!