Free Engine Camshaft Lobe Separation Angle (LSA) Calculator

Application Specification: Engine Camshaft Lobe Separation Angle (LSA) Calculator

Overview

The Engine Camshaft Lobe Separation Angle (LSA) Calculator is a high-performance, browser-based engineering tool. It eliminates the need for manual math, providing immediate, accurate calculation of Lobe Separation Angle based on Intake Centerline (ICL) and Exhaust Centerline (ECL) inputs.

Technical Constraints & Compliance

• Strictly No Persistent Storage: Do not use localStorage, sessionStorage, or cookies. The app must rely entirely on volatile memory. All calculations are transient.
• Architecture: Single-file HTML5/CSS3/Vanilla JS. No build steps.
• Dependencies: Tailwind CSS via CDN for styling. Lucide Icons for UI elements.
• Sandboxed Environment: Must function perfectly within a null-origin iframe (no popups, no external redirects unless via _blank).

User Interface Layout

• Header: Professional, minimalist branding-free title ("Engine LSA Calculator").
• Input Section:
  • Two primary number inputs (ICL, ECL) with clear labels and tooltips.
  • A clear "Calculate" button (though real-time calculation on input is preferred).
• Results Section:
  • A prominent, large-font display for the calculated LSA value.
  • Secondary metric display showing current Overlap estimate (if ICL/ECL are known).
• Visualization: A simple, high-contrast SVG diagram illustrating the relationship between the intake and exhaust lobes.

Design System & Aesthetics

• Color Palette: Professional SaaS aesthetic: Deep Navy (#1e293b) for text, Electric Blue (#3b82f6) for primary actions, Slate Grey (#f1f5f9) for backgrounds, and Success Green (#22c55e) for result highlighting.
• Typography: Inter or System Sans-serif. High readability.
• Micro-interactions:
  • Smooth fade-ins for result updates using CSS transition: opacity 0.3s ease-in-out;.
  • Inputs should provide subtle border-color changes on focus.
  • No distracting animations; focus on speed and reliability.

Implementation Roadmap

1. State Management: Use a simple JavaScript object to store the current calculation state in memory.
2. Validation: Implement input validation to ensure numeric values only, preventing non-sensical data (e.g., negative degrees).
3. Calculation Engine:
   • Formula: LSA = (Intake Centerline + Exhaust Centerline) / 2.
   • Ensure logic handles edge cases gracefully without crashing the UI.
4. Responsive Strategy: Stack inputs vertically on mobile; use a grid layout for desktop to place inputs and diagrams side-by-side.

Security & Performance

• Sanitize all inputs before calculation to prevent any potential DOM injection.
• Ensure all links (if any) utilize rel="noopener noreferrer".
• No tracking scripts, no analytics, no external dependencies outside of the approved CDN files.