Demon Carburetor - The Demon Within

This Line Of Fuel Meters Helps Brings Out The Beast In Performance

Mike Petralia May 1, 2001 0 Comment(s)
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Even though a carbureted vehicle hasn't rolled off the assembly line for more than a dozen years, that in no way means that carbs are dead. Nothing could be further from the truth. In fact, GPT300, formerly BG Fuel Systems, has capitalized on the carburetor power market and has engineered some of the coolest street and race carbs on the planet.

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The Demon RS line of performance carburetors is the first to offer a vast assortment of user-friendly tuner parts.

The Demon carburetor line is made up of four models: Road Demon, Speed Demon, Race Demon, and King Demon. The Road Demon carbs flow 625 cfm and are engineered for street performance with vacuum-operated secondaries. Road Demons are engineered as an affordable fueler for 200 to 350hp street engines. Speed Demons are next up the performance ladder and are available in 650, 750, and 850-cfm versions that can be ordered with either vacuum or mechanical secondaries.

The newest carb to come from GPT300 is the Speed Demon VE that even offers an electric choke (the only 850-cfm electric choke performance carb in the Demon line) for the ultimate in streetability. The Race and King Demon carbs can be used on the street if you're so inclined, but they're really built for all types of racing from off-shore power boats to Pro-Street race cars. Race and King Demons are offered in two versions, Standard and RS. The RS in all Demon carbs designates that they are equipped with removable venturi sleeves and replaceable venturi boosters which give these carbs the ultimate in versatility and tuning ability.

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Customizing your Demon carb is easy thanks to its removable venturi sleeves. The sleeves are color-coded for size and offer cfm variances from 390 to 1,050, meaning you can have anything from a restricted Winston Cup-style four-barrel to an all-out, nitrous-ready monster just by purchasing one carb.

Looking beyond race tuning and ultimate horsepower capability, the Demon line was engineered with several improvements over tradition four-barrel carbs. One of the line's best features is the billet aluminum baseplates on all Road, Speed, and Race Demons and the aluminum metering blocks standard in all. The benefit of using billet material over a casting is that there's no porosity in billet parts and porosity has been known to cause havoc in carburetors. Also, making the base plates from a solid block of aluminum means there's little chance of snapping an ear off of it when you torque it down to the intake manifold. Idle and float level adjustments are easily done on the Demon carbs thanks to the large, clear sight-glass plugs in the side of each fuel bowl and the big, knurled idle-mixture screws that are easy to keep your screwdriver or fingers on. Race Demons even feature a secondary throttle shaft idle speed adjustment so motors with big cams won't have to open the primaries too far just to idle. All Demon main bodies are manufactured utilizing a new die-casting technology that ensures an accurate, smooth venturi that won't require any hand polishing to optimize flow. This means the days of grinding and smoothing venturis are a thing of the past.

The Road and Speed Demon line were designed to handle about 90% of the carburetor market. We've had good success making power with out-of-the-box Demon carbs, including the stock 750-cfm Speed Demon that fueled our 408-cid "Mean Little Rodent" big-block, which has already made more than 540hp with nothing more than a jet change. In fact, the Speed and Road Demon carbs are so universal and cover so much ground that you'd be hard-pressed to find a street engine they wouldn't work great on.




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