vanolinda86
10.05.2021 20:35:18
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An engine rated at 350hp x .5 = 175lbs [links]
175lbs ÷ 6 = 29 gallons per hour (GPH)
As a general rule, you can calculate how much fuel your engine requires. At wide open throttle a naturally aspirated engine will require about .5lbs of fuel per horsepower every hour. Forced induction will be slightly higher, .6 to .75lbs/hr. Take a gallon of gasoline which weighs about 6lbs and do the math. more
On four barrel carbureted systems fuel pressure requirements typically range between 6 and 8psi. If you’re installing a fuel pump rated between 6 and 8psi, the fuel system will not require a regulator. When using pumps rated above 8psi a regulator is required to keep the carburetor from flooding. [links]
While some fuel systems under 700 horsepower have upgraded fittings and hoses, once you get near the 700 horsepower area, using proper fittings and hoses to supply sufficient fuel is paramount.
When it comes to choosing a fuel pump, you need to determine how much power your engine is actually making. If you haven’t dyno-ed your engine, you can make a reasonable guess, and luckily since everyone usually guesses with high hopes, you will usually be safe.
High-performance engines have the ability to deliver unheard of horsepower numbers as compared to what was considered high performance just 10 – 15 years ago. Engines today are able to make use of better-flowing cylinder heads, ignition systems that can melt metal, and camshaft profiles once reserved for purpose-built race cars. But making a lot of power is useless if you don’t properly feed the engine. We’re going to take a look at different fuel system components.
450 hp x .75 BSFC = 337.5 pounds of gasoline. more
Most electric fuel pumps will also require the use of a pressure regulator. Not many high-performance fuel pumps are designed to deliver no more than eight pounds of pressure, and that is why a regulator is required. A large restriction in a fuel system is a “dead-head” regulator. These regulators are popular because of their simplicity since no return line is used. Not only are they restrictive, but they create other problems that can be eliminated with a return-style regulator. While a “dead-head” regulator regulates pressure by starting and stopping the fuel flow, return-style regulators regulate pressure by sending excess fuel back to the tank or fuel cell. here
With that being said, let’s take a look into selecting proper fuel system components (i.e., pumps, filters, fuel lines, and other items), needed for a carbureted system—based on horsepower. Whether you are a drag racer or road racer, supplying the needed fuel to your engine with the right pressure, and volume, is crucial to achieving the ultimate performance.
Port Fittings Port Fittings function just like Pipe Fittings, but with the following distinctions. Port Fittings conform to AN standards - typically per Military Standard MS33649. The cone end uses Straight Thread and a 37° cone. The male port end of the fitting uses Straight Thread, and is received by a female port of corresponding size and thread pitch. Port Fittings require use of O-rings. Like AN Adapters, special port machining is done to "capture" and properly compress the O-ring which allows for greater sealing ability with very high reliability of installation as compared to Tapered Threads using sealing compounds or Teflon tape. This reliability makes Port Fittings the preferred choice over Pipe Fittings for high-end racing and performance fuel system applications. It should be noted that while manufacturers of high performance fuel delivery systems often specify Port Fittings for connections to fuel pumps and fuel pump regulators, the connections to fuel pressure gauges, via gauge ports, most often utilize Pipe Fittings. This is because the vast majority of the in-line fuel pressure gauges on the market use Pipe Fittings for connection.
This article describes the different types of fittings that are commonly used for high-end racing and street performance applications. The fittings we will discuss are Adapter Fittings (also called Standard, or Union), Port Fittings, and Pipe Fittings, as well as thread types and size standards associated with each.
We hope this overview has provided a better understanding of the differences and uses of Straight Thread versus Pipe Thread, as well as the types of fittings used. If you have further questions about fuel delivery system plumbing, please contact Fuelab Technical Support.