CNC Machine Center
https://chatgpt.com/c/684e50f3-490c-8010-9882-3c150d7d9ff6
Get a used Fadal to make 38 hp engines using LinuxCNC. Perfect Impossible Project, worth about $3B addressable market [1].
https://chatgpt.com/share/684e721a-2690-8010-96cf-a76419a339d2
Contents
EFI Controller Comparison for Open V-Twin Engine Project
Selecting the right electronic fuel injection (EFI) controller is critical to the success and reproducibility of an open-source engine platform. Below is a comparison of leading open-source (and semi-open) EFI solutions tested or proposed for the 38 HP EFI V-twin project.
✅ microRusEFI — Recommended for Long-Term Modular Design
microRusEFI is a modern, compact, fully open-source EFI platform based on the STM32 microcontroller family and the rusEFI firmware ecosystem. It is our preferred EFI controller for the V-twin engine project due to its combination of modern electronics, flexibility, and advanced control features.
Specific advantages:
- Fully open hardware and firmware (unlike Megasquirt MS2/MS3)
- Native support for sequential injection and logic-level coil control (ideal for a twin)
- Real-time logging, self-tuning integration, and rusEFI_console GUI support
- Scalable to future designs (e.g. turbocharging, knock sensing, CAN bus, boost control)
- Compact PCB ideal for sealed, vibration-resistant engine bay installation
Ideal for: Builders seeking a long-term EFI development platform with full control over every parameter and diagnostic output.
→ GitHub Project: rusefi/microRusEfi
🟦 Speeduino — Excellent for Rapid Prototyping & Education
Speeduino is a DIY-friendly EFI solution based on the Arduino Mega platform. It has a large grassroots community and is well-documented for use in 2- to 4-cylinder engines.
Specific advantages:
- Easy to build and modify (through-hole components, modular)
- Low cost and widely available kits and premade units
- Compatible with TunerStudio tuning software
- Works well in batch-fire configurations or semi-sequential
Limitations:
- Less robust for high-RPM or complex load scenarios
- Lacks built-in knock sensing, CAN bus, or advanced closed-loop controls
- Injector timing and dwell control are less precise at high speeds
Ideal for: Entry-level EFI users, education projects, or minimal batch-fire builds.
🔵 Megasquirt MS2/MS3 — Feature-Rich but Proprietary Firmware
Megasquirt is a widely-used aftermarket EFI system with support for a large number of engine configurations. MS3 in particular offers full sequential injection, CAN, boost, and idle control.
Considerations:
- Closed firmware, limited modifiability
- Higher cost (~$300–600)
- Community support is broad but geared toward automotive enthusiasts
Ideal for: Users who want a tested, feature-rich system but don’t require open-source firmware.
📘 Summary Table
| Feature | microRusEFI | Speeduino | Megasquirt MS2/MS3 |
|---|---|---|---|
| Open Source (HW & FW) | ✅ Fully | ✅ Mostly | ❌ Firmware closed |
| Sequential Injection Ready | ✅ Yes | ⚠️ Limited | ✅ Yes |
| Cost | 💲💲 | 💲 | 💲💲💲 |
| Tuning Software | TunerStudio, rusEFI tools | TunerStudio | TunerStudio |
| Diagnostics + Expansion | ✅ Advanced | ⚠️ Basic | ✅ Advanced |
| Ease of Use (Beginner) | ⚠️ Moderate | ✅ Easy | ⚠️ Moderate |
microRusEFI is the recommended platform for the 38 HP open-source V-twin due to its blend of modern electronics, open licensing, sequential control, and growing developer ecosystem. It represents a forward-compatible choice for open manufacturing ecosystems and resilient engine design.
