12 Strokes.
One Cycle.
The TFV6 utilizes a Double-Acting piston mechanism. By sealing the lower chamber, we achieve combustion events on both the top and bottom of the piston, effectively doubling the firing frequency of a standard V6.
Schematic 03: Crosshead Logic
Engineering Solutions
The Sealing Problem
Challenge: Standard connecting rods swing, making it impossible to seal the bottom cylinder.
TW Solution: We implemented a marine-style Crosshead Mechanism. A linear top rod moves vertically through a stuffing box seal, while the pivoting motion is isolated to the lower crankcase.
Thermal Management
Challenge: Double firing eliminates the intake cooling stroke, risking piston overheating.
TW Solution: Active Internal Cooling. Using hollow piston rods to pump coolant directly through the piston crown to manage thermal loads.
Volumetric Balance
Challenge: The piston rod occupies volume in the bottom chamber (~5% loss).
TW Solution: Calculated compensation via increased compression ratio and turbocharger boost offset for the lower induction tract.