Plastinin Ch.6 · Frenkel (1968) §VII

Valve Engineering

⚠ Beta — same engine as the Analysis page, freshly launched.

The same sizing criteria shown in the Mac app's Valve Engineering tab — equivalent flow area, the Plastinin velocity criterion F, the Frenkel M sizing check, lift durability and spring preload — computed from the stage you enter below. Every threshold and formula here is identical to the desktop app; see the Formulas page for the underlying equations.

Stage input

Same stage as the Analysis page — fields left blank use the engine's own defaults.

Cylinder

Bore (mm) *

Stroke (mm) *

Speed (rpm) *

Conditions (absolute pressure)

Suction (bar a) *

Discharge (bar a) *

Suction temp (°C) *

Valve

Type *

Lift (mm) *

Spring rate (N/mm) *

Valve OD (mm)

Suction valves/end

Discharge valves/end

Gas

Preset

Advanced — ring / seat dynamics (optional, improves accuracy)

Cylinders

HE clearance (%)

CE clearance (%)

HE rod (mm)

CE rod (mm)

Wall temp (°C)

Rings

Ring mass (kg)

Ring material

Seat channel width (mm)

Seat inner diameter (mm)

EOS model

Fill in the stage on the left and press Run analysis.
The Plastinin and Frenkel valve-sizing checks will appear here.

Valve Engineering

Stage input

Valve Engineering

API endpoint