Engine Masters Season 6 Episode 89 4150 v 4500 - The Battle of the Holley Carbs

In Engine Masters season 6 episode 89, entitled "4150 v 4500 - The Battle of the Holley Carbs," the team tests two widely used Holley carburetors: the 4150 and the 4500. The episode begins with an introduction to the two carbs and the differences between them. The 4150 is a four-barrel, square-bore carburetor with vacuum secondaries and a rating of 750 cfm (cubic feet per minute). The 4500, on the other hand, is a dominator-style carburetor with a rating of 1050 cfm and uses mechanical secondaries.

To test the two carbs, the team uses a 496 cubic inch big block Chevy engine with a 10.7:1 compression ratio. The engine was built previously in a different episode, so the team goes over the specs before starting the tests. First, they begin with the 4150 carb, which is known for its user-friendly design and broad tuning range. The team conducts several dyno pulls to measure the engine's output with different jet and power valve configurations. They also test a carburetor spacer to see if it improves performance.

Next, the team switches to the 4500 carburetor, which is often used in racing applications due to its high airflow capacity. With its mechanical secondaries, it provides an instant response when the throttle is opened. The team repeats the same tests as with the 4150 carb, utilizing different jet and power valve configurations to optimize performance. They also test a different carburetor spacer design to see if it can improve performance over the other spacer they used.

Throughout the episode, the team provides analysis and commentary on the results of each test. They discuss the strengths and weaknesses of each carburetor and how they can be optimized for specific applications. They also compare the performance of the two carburetors against each other.

As the episode concludes, the team looks at the overall results of the tests and summarizes their findings. They offer recommendations on which carburetor may be better suited for various types of engines and applications. The episode provides valuable information for anyone looking to upgrade their carburetor or optimize the performance of their engine.

Overall, "4150 v 4500 - The Battle of the Holley Carbs" is an informative and engaging episode that provides insight into the strengths and differences of two widely used carburetors. The team's thorough testing and analysis offer valuable information for engine enthusiasts and professionals alike.