In a hypothetical case, let's say we have a 360 LA engine with 11.0:1 compression and a camshaft with .258-degrees of duration at .050-inch lift. Right off the bat, according to the carb selection charge at www.barrygrant.com, we can see a Road Demon 725-cfm vacuum secondary carb would be too small. On the other hand, a Mighty Demon 750-cfm mechanical carb would be ideal. Always get the manufacturer's suggestion when choosing a carb.
Air Heads
Finally, no fuel system is complete without placing some thought into the air that enters the carb. A quality air filter is a must, and advancements in filtration technology have made the air filter welcome on any performance engine due to its increased air-flow. Tests have proven that the right air filter shows negligible decreases in horsepower on the dyno.
Fuel Pumps
Whether to use a mechanical or electric fuel pump depends on personal preference, and the demands that will be placed on the fuel pump. In the past, the prevailing thought was that you must use an electric pump for performance applications. Depending on how much performance you are looking for, that is true. But with the advancements made in fuel pump technology, a mechanical is now a viable option when a certain amount of performance is desired. Another consideration when using a high-volume pump is a regulator. If a fuel pump delivers more than 7 1/2 psi, it will overpower the needle and seat, and flood the carb. A regulator is an adjustable device that plumbs in the fuel system after the pump, and regulates the fuel pressure to the carb. Again, consult the manufacturer for their recommendations. If you do use an electric fuel pump, be sure to use a relay in the electrical system to ensure the pump is provided with the proper voltage in order to maintain proper fuel flow.
This Rush Air filter uses...
This Rush Air filter uses premium U.S. long staple cotton in a stable sandwich of aluminum mesh. Long staple cotton has much longer "whisker" fibers extending into the airflow than other competitive materials. As air moves through the filter that is treated with the specialty filtration oil, the longer whisker is more active as it waves back and forth, sweeping the air, seeking out and capturing the passing dirt particles as they pass through the filter. The longer, more active, oil-treated "whiskers" provide greater filtration surface to attract and retain engine-damaging dirt, while optimizing airflow over conventional paper filters.
When it comes to getting the...
When it comes to getting the fuel to the carb, having more than 6 1/2 to 7 p.s.i. will definitely cause headaches. The excess pressure will force the fuel past the needle and seat, and flood the engine. Definitely not something you want to deal with. These fuel logs will connect the carb to the fuel source, and they can be ordered with an internal regulator.