21/10/2010
For enthusiasts of classic automobiles, preserving the original character and driving experience is paramount. However, the inherent limitations of carburettor technology – such as poor cold starting, inconsistent idling, and susceptibility to vapour lock – can sometimes detract from the enjoyment of these timeless machines. This is where the innovation of electronic fuel injection (EFI) systems comes into play, and at the forefront of this revolution for classic vehicles stands Howell EFI. For decades, Howell EFI has been synonymous with bringing modern, reliable fuel delivery to iconic engines, allowing them to perform with the efficiency and drivability expected of contemporary vehicles, all while retaining their authentic charm.
The Genesis of Howell EFI
The story of Howell EFI is rooted in a passion for classic cars and a keen understanding of their mechanical nuances. Founded by Bob Howell, a true automotive visionary, the company emerged from a desire to overcome the inherent challenges associated with carburetted engines in older vehicles. Bob Howell recognised that while carburetors were the standard for their era, they were often temperamental and inefficient by modern standards. His mission was to develop an EFI system that was not only technologically advanced but also specifically tailored to the unique demands of classic V8 engines, particularly those found in American muscle cars and hot rods. This focus on heritage vehicles has remained a cornerstone of Howell EFI’s identity and success.
The early days involved extensive research, development, and rigorous testing. The goal was to create a system that was relatively straightforward to install, user-friendly in its operation, and capable of delivering significant improvements in performance, fuel economy, and reliability. Unlike many aftermarket EFI systems designed for modern vehicles, Howell EFI’s offerings were meticulously engineered to integrate seamlessly with the aesthetics and mechanical characteristics of classic cars, often requiring minimal modification to the original engine components. This dedication to a sympathetic approach to classic car modification has earned Howell EFI a loyal following among restorers and custom builders alike.
Howell EFI's Product Philosophy
At its core, Howell EFI’s product philosophy revolves around simplicity, reliability, and performance. They understand that the typical classic car owner may not be an expert in automotive electronics. Therefore, their systems are designed with a focus on ease of installation and tuning. This often translates to:
- Direct-fit components: Many of their kits are designed to bolt onto existing manifold bolt patterns, reducing the need for extensive fabrication.
- Intuitive tuning: While offering sophisticated control, the tuning process is often simplified through user-friendly software and pre-programmed base maps that can be fine-tuned by the user or a professional.
- Robust construction: Howell EFI components are built to withstand the rigours of regular use and the often less-than-ideal conditions found in older engine bays.
The Howell EFI System: Key Components and Benefits
A typical Howell EFI system comprises several key components, each playing a crucial role in delivering precise fuel delivery:
Fuel Injectors
These are the heart of the EFI system, responsible for atomising and spraying fuel directly into the intake manifold or cylinder ports. Howell EFI utilises high-quality injectors, carefully selected for their flow rate and spray pattern to match the specific engine’s requirements. The precise control over fuel delivery ensures optimal air-fuel ratios across all operating conditions.
Fuel Pump and Regulator
Unlike carburetted systems that rely on mechanical pumps, EFI systems require a higher-pressure fuel pump. Howell EFI systems include a suitable electric fuel pump, often a submersible or in-line unit, along with a fuel pressure regulator. The regulator maintains a consistent fuel pressure, ensuring the injectors receive fuel at the correct pressure for optimal atomisation and metering.
Throttle Body
The throttle body in an EFI system replaces the carburettor. It houses the throttle plate, which controls the amount of air entering the engine, and also typically incorporates the throttle position sensor (TPS). The TPS relays the throttle opening angle to the Engine Control Unit (ECU).
Engine Control Unit (ECU)
This is the brain of the operation. The ECU receives data from various sensors (such as the TPS, manifold absolute pressure (MAP) sensor, coolant temperature sensor, and oxygen sensor) and calculates the precise amount of fuel to inject and the optimal ignition timing. Howell EFI’s ECUs are programmed to work with classic V8 engines, offering a balance of performance and drivability.
Sensors
A network of sensors provides the ECU with real-time information about the engine’s operating conditions. Key sensors include:
- Throttle Position Sensor (TPS): Measures how far the throttle pedal is pressed.
- Manifold Absolute Pressure (MAP) Sensor: Measures the pressure (or vacuum) in the intake manifold, indicating engine load.
- Coolant Temperature Sensor (CTS): Informs the ECU about the engine's operating temperature, crucial for cold starts and warm-up enrichment.
- Oxygen (O2) Sensor: Measures the oxygen content in the exhaust gases, allowing the ECU to fine-tune the air-fuel mixture for optimal efficiency and emissions control (in closed-loop operation).
The Howell EFI Advantage: A Comparative Look
To truly appreciate the benefits of Howell EFI, it’s helpful to compare it with traditional carburettor systems:
| Feature | Carburettor System | Howell EFI System |
|---|---|---|
| Starting | Can be difficult, especially when cold; often requires manual choke. | Effortless, hot or cold, due to precise fuel metering. |
| Idling | Often inconsistent, prone to fluctuations, especially with engine wear. | Smooth and stable, regardless of engine temperature or load. |
| Fuel Economy | Generally lower, as fuel delivery is less precise. | Significantly improved due to precise air-fuel ratio control. |
| Performance | Can be tuned for peak power, but often sacrifices drivability. | Responsive across the entire RPM range, improved low-end torque and throttle response. |
| Altitude/Temperature Compensation | Requires manual adjustment or jet changes for significant changes. | Automatic compensation via sensors, maintaining optimal performance. |
| Vapour Lock | Susceptible, especially in hot weather or with high-performance engines. | Eliminated, as fuel is delivered under pressure. |
| Maintenance | Regular tuning, cleaning, and adjustment required. | Generally very low maintenance once properly set up. |
Who Benefits Most from Howell EFI?
Howell EFI systems are particularly well-suited for a range of classic vehicle applications:
- Owners seeking improved drivability: If you want your classic car to start easily, idle smoothly, and drive like a modern vehicle without compromising its classic looks.
- Restorers and custom builders: For those who want to upgrade their classic vehicle's powertrain with modern technology while maintaining an authentic or period-correct appearance.
- Performance enthusiasts: EFI systems offer better control over fuel delivery, leading to more consistent power output and the ability to fine-tune for maximum performance.
- Those driving in varied conditions: The automatic adjustments made by EFI systems make them ideal for drivers who encounter different altitudes, temperatures, and driving styles.
Installation and Tuning Considerations
While Howell EFI systems are designed for ease of installation, it's important to approach the process with care. Many kits are designed as direct replacements for carburettors, simplifying the mechanical aspects. However, wiring the sensors and the ECU requires a good understanding of automotive electrical systems. The company provides detailed instructions, and for those less confident with wiring, professional installation is recommended. Tuning is also a critical step. While Howell EFI systems are often supplied with base maps, fine-tuning using a laptop and the provided software allows the user to optimise the system for their specific engine and driving preferences. This tuning can unlock the full potential of the EFI conversion, leading to the best possible performance and economy.
Frequently Asked Questions
Q1: Will a Howell EFI system change the look of my classic engine bay?
Howell EFI systems are designed to be aesthetically pleasing and often integrate well with classic engine bays. While there will be visible components like the throttle body and fuel rails (depending on the specific kit), the overall appearance is generally considered a subtle upgrade rather than a radical departure from the original look.
Q2: Is it difficult to tune a Howell EFI system?
The tuning process is designed to be accessible. Howell EFI provides software and base maps. For basic optimisation, many users can achieve excellent results. However, for maximum performance and to dial in very specific driving characteristics, having the system professionally tuned is often recommended.
Q3: Can I use my existing manifold with a Howell EFI system?
Many Howell EFI kits are designed to work with factory or aftermarket intake manifolds that were originally designed for carburettors. The throttle body typically bolts to the manifold in a similar fashion to a carburettor. However, it’s always best to check the specific kit’s compatibility with your manifold.
Q4: What kind of fuel economy improvements can I expect?
Improvements vary depending on the engine, the original carburettor's condition, and driving habits. However, many users report significant gains in fuel economy, often in the range of 10-25%, due to the more precise fuel delivery of EFI.
Q5: Are Howell EFI systems reliable?
Yes, Howell EFI systems are known for their robustness and reliability. They use high-quality components and are designed to withstand the demands of daily driving and performance applications.
Conclusion
Howell EFI has carved out a significant niche in the automotive aftermarket by providing high-quality, reliable, and performance-enhancing electronic fuel injection systems specifically for classic vehicles. By bridging the gap between vintage aesthetics and modern efficiency, Howell EFI allows enthusiasts to enjoy the timeless appeal of their classic cars with the convenience and performance of contemporary technology. Whether you're undertaking a full restoration or simply looking to improve the drivability of your cherished classic, Howell EFI offers a compelling solution that honours the past while embracing the future of automotive engineering.
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