
( Brand: Holley ), ( Manufacturer Part Number: FR-4777SAE ), ( Part Type: Aluminum Carburetor ), ( UPC: 090127044520 )
The Holley FR-4777 SAE Double Pumper Carburetor is a high-performance fuel delivery system designed for serious automotive enthusiasts. This carburetor features a unique double pumper design, which utilizes two separate fuel pumps to provide an abundant fuel supply for high-horsepower applications.
The primary pump, located at the base of the carburetor, is a proven Holley 4-750 double diaphragm pump. This pump is capable of delivering up to 1200 CFM of fuel, ensuring that even the most power-hungry engines receive the fuel they need to perform at their best. The secondary pump, located in the float bowl, is a Holley 4-250 pump that provides additional fuel delivery during high-load situations.
The Holley FR-4777 SAE Double Pumper Carburetor is equipped with a 950 cfm venturi, which is suitable for a wide range of engine sizes. The carburetor also features a 1-1/4 inch metering rod, which allows for precise fuel metering. The float bowl has a capacity of 2.2 quarts, providing ample fuel storage for extended periods of high-speed driving.
The Holley FR-4777 SAE Double Pumper Carburetor is built with durability in mind. The primary pump and secondary pump are both housed in a billet aluminum pump body, which is both lightweight and strong. The carburetor also features a billet aluminum main body, which is anodized for a long-lasting finish. The fuel inlets and outlets are made from brass, which is resistant to corrosion and wear.
The Holley FR-4777 SAE Double Pumper Carburetor is easy to install and adjust. The carburetor comes with a high-quality fuel pump kit, which includes all the necessary hardware for installation. The carburetor also features adjustable idle mixture and air/fuel ratio adjustments, which allow for easy tuning to match the specific needs of your engine.
In conclusion, the Holley FR-4777 SAE Double Pumper Carburetor is a high-performance fuel delivery system designed for serious automotive enthusiasts. Its unique double pumper design provides an abundant fuel supply for high-horsepower applications, while its durable construction and easy installation make it a great choice for any performance project. Whether you're building a hot rod, a drag car, or a straight-line truck, the Holley FR-4777 SAE Double Pumper Carburetor is a proven performer that can help you take your engine to the next level.
Pros of the Holley FR-4777 SAE Double Pumper Carburetor:1. High-Performance: The Holley Double Pumper carburetor is known for its high-performance capabilities. It provides excellent air/fuel mixture and throttle response.
2. Dual Pump Design: The dual pump design ensures a consistent fuel delivery under all conditions, which is beneficial for high-performance applications.
3. Adjustability: The carburetor has multiple adjustments, including main jet, power valve, and secondary circuit, allowing for fine-tuning to meet specific engine requirements.
4. Durable Construction: Holley carburetors are built to last, with high-quality materials and construction. They are resistant to corrosion and can withstand high-power applications.
Cons of the Holley FR-4777 SAE Double Pumper Carburetor:1. Complexity: The dual pump design and multiple adjustments make the Holley Double Pumper carburetor more complex to install and maintain compared to single-pump carburetors.
2. Cost: Due to its high-quality construction and performance capabilities, the Holley Double Pumper carburetor is typically more expensive than other carburetors in the market.
3. Learning Curve: Adjusting the carburetor requires a certain level of knowledge and experience, which may be a challenge for some users.
Conclusion:The Holley FR-4777 SAE Double Pumper Carburetor is a high-performance option for users looking to improve their engine's performance. Its dual pump design, adjustability, and durable construction make it a reliable choice for high-power applications. However, its complexity, cost, and learning curve may be drawbacks for some users. Ultimately, the decision to purchase this carburetor depends on your specific needs, experience, and budget.
Recommendation:If you are a performance enthusiast with experience in carburetor tuning and have a budget for a high-performance carburetor, the Holley FR-4777 SAE Double Pumper Carburetor is a solid choice. However, if you are new to carburetors or have a tighter budget, a single-pump carburetor may be a more appropriate option for you.
Dual feed fuel inlet's for constant high volume delivery. Optimized street/strip calibration that works out-of-the-box. A signature is required on all UPS orders over $750. Buyer pays return shipping.
100% wet-flow tested by Holley technicians to assure it arrives ready run. Mechanical secondaries for awesome tire turning performance. Electric choke for precise cold start control.