Road Demon is a mild cam carburetor for standard performance. Three Road Demon models 525, 625, 725 are available, each with slightly different specifications. Road Demon carburetors have an idle air bleed or .070 inches across the board. High speed air bleed on the Road Demon is .041 inches on the 525 and 625 and .039 inches on the 725. Air bleed is a small hole used to introduce air into the air/fuel curve of an engine to positively affect performance. The primary booster on the 525 is an annular, while the 625 and 725 have a down leg primary booster. A booster leg aids in the carburetor discharge process.

Speed Demon is a performance cam carburetor designed for increased speed and performance. There are three types of Speed Demon carbs available: Twin Squirter, VE Series and Competition Series. Specifications on these three types are similar across the board. All models have an idle air bleed of .070 inches. High speed air bleeds on the Speed Demon run from .028 to .041 inches. Booster legs on Speed Demons are either down legs or annular. The pump diameter size on all Demon carburetors, including Speed Demon models, is 30 cubic centimeters. This indicates the carburetor’s capacity to pump air and fuel.

Mighty Demon is a radical cam carburetor designed for racing performance and speed. Idle air bleed on the Mighty Demon is .070 inches and high speed air bleed is between .031 and .041 inches, depending on the model. According to "Car Craft," the Mighty Demon air bleed works well at standard speed, though performance suffers at racing speeds. As standard air bleed measurements for all Demon carburetor models are in the same range, "Car Craft" makes the case that Demon carburetors are ideally suited for standard performance functions unless users have the technological know how required to alter the pieces. Four Mighty Demon models have down leg boosters and one has an annular leg booster.

How to Tune a Demon Carb

Demon carburetors offer several options to adjust the engine performance. This can be done by adjusting the carb performance screws (idle mixture screws.

How Can I Tell What Size My Demon Carb Is?

The line of Demon carburetors were designed for high engine performance on the street and on the track. A product of the. Although fuel injection (be it mechanical or electronic) is generally the best option for use with turbochargers and superchargers.