Robin Shute continues to dominate the Pikes Peak International Hill Climb with his heavily modified Wolf chassis featuring a Mountune USA prepared Honda K20. The 700+ HP engine features a range of modifications engineered not only for power but reliability. New for this year was the addition of fresh air anti-lag to enhance the engine response and dramatically reduce turbo lag. The foundation of the engine is the heavily modified engine block that includes the addition of Darton MID Sleeves and O-Ring sealing all secured with ARP fasteners. The rotating assembly is made up of a forged steel crankshaft and connecting rods and 10.5:1 CR 2618 High strength alloy pistons with NPR rings. ACL bearings are used throughout. The cylinder head ports have been modified for maximum velocity and the VTEC system has been disabled. The camshafts are bespoke and operate Supertech roller rockers and valves. A custom configured Borg Warner EFR Turbocharger provides the boost. The engine also relies on a Pace dry sump system and Motul 300V oil to ensure maximum protection and reduced friction.
The MID or Modular Integrated Deck design adds considerable strength to the engine block assembly by stabilizing the deck surface and increasing the cylinder wall thickness, a must for high cylinder pressure applications.
The standard Honda K20 cylinder head is modified with slightly larger valves and valve train supplied by Supertech. The VTEC feature was disabled but the VVT system was retained on the intake cam. Camshafts are a custom Mountune USA design.
Motul 300V is used to provide stable and maximum protection and performance.
| Engine Designation: | Mountune Honda K20A 2.1L |
| Race series used in: | Pikes Peak International Hill Climb |
| Number of cylinders: | 4 |
| Bore: | 88mm |
| Stroke: | 86mm |
| Induction | Single turbo |
| Fuel type and rating (RON/MON) | VP Racing X85 (E85) |
| Block material | Aluminium |
| Liners | Darton MID Sleeves |
| Cylinder material | Ductile Iron |
| Type of big end and main bearings | ACL Racing |
| Crankshaft material | Forged Steel |
| Number of crankpins | 4 |
| Number of main bearings | 5 |
| Rod material | SAE 4340 |
| Piston material | 2618 High Strength Alloy |
| Number of piston rings | 3 |
| Piston ring material | NPR Steel + Nitriding/Steel + Cr |
| Pin material/coating | 5115 low-alloy steel - no coating |
| Valvetrain | DOHC |
| Type of cam follower | Supertech Roller type rocker arm |
| Variable valve lift/timing system | Variable intake valve timing |
| Method of cam drive | Chain |
| Number of spark plugs or ignition sources per cylinder | 1 |
| Valves per cylinder: | 4 |
| Valve angles | NA |
| Valve sizes | In 35.5mm Ex 30.5mm |
| Valve materials | In Stainless Steel Ex Inconel |
| Solid or hollow valves | Solid |
| Type of ignition | Coil on Plug |
| Type of throttle | single butterfly |
| Number of injectors | 4 |
| Position of injectors | Port |
| Compression ratio | 10.5:1 |
| Peak torque rpm | 4500-9000 rpm |
| Peak power rpm | 9000 rpm |
| Max rpm | 9000 rpm |
