Spring-Powered V8 Engine Model: Mechanical Design, Energy Conversion, and Thermodynamic Analysis

This paper presents a theoretical mechanical design and analytical study of a hand-loaded, spring-powered V8 engine model. The proposed machine converts manually pre-stored elastic potential energy governed by Hooke's Law (F = kx) into sustained rotational mechanical output through a six-stage energy conversion pathway. Eight coiled steel compression springs drive silver piston rods linearly through precision pillow-block bearings. A central forged steel crankshaft with eight crank pins at 90-degree cross-plane intervals converts linear piston motion into torque. A solid disc flywheel smooths intermittent spring impulses into continuous rotation via rotational inertia (I = half MR squared). Analytical energy distribution estimates suggest approximately 40% useful mechanical output, 35% bearing friction loss, and 25% aerodynamic and structural losses. The paper addresses perpetual motion misconceptions, derives a runtime prediction formula, discusses spring fatigue, and outlines safety considerations.