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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The new Speed Demon VE-series carb offers all the creature comforts and streetability you'll need in a performance carb. Adjustable vacuum secondaries and an electric choke are available on all the 650, 750, and 850 cfm VE carburetors. These carbs were engineered to deliver exceptional starting and all-weather driving performance.

Race Demon RS carbs are the first carburetors to feature unique removable venturi sleeves and boosters. What this means is that with the purchase of just a single carburetor, you'll have the option of building anything from a 390-cfm oval track carb to a 1,050-cfm heavy-breathing monster for all-out competition. Also, the billet aluminum metering blocks used in all RS Demons feature removable emulsion circuit bleeds allowing you to fine-tune the fuel curve to match the engine. Although, modifying the emulsion circuit is best done on the dyno and does require intricate carburetor knowledge. But, changing venturi sleeves does not require intense wisdom, and it's easy to do with just a few hand tools in about 30 minutes. Basically, tuning any performance carb properly does require a good understanding of how and why a carburetor functions. That's why GPT300 recommends running your new Demon carb right out of the box to see how it responds before you turn a single screw.

If you've chosen your carb properly, you'll have some idea of where and if any changes are needed. And if you get in too deep, there's always a carb expert waiting on the phone at GPT300 (at least from 8-5 EST M-F) to get you out of trouble should you tune beyond your means. To further assist you in your quest to perfectly tune your new Demon carb, the original factory settings for each carb model are printed in detail in the back of the Demon catalog. And since there's never any drilling or machining involved with tuning a Demon carb, it's always easy to return to stock if your modifications don't pan out.

With companies like GPT300 perfecting its Demon line of street and race carburetors, we're sure to have four-barrels under the hoods of our hot rods for years to come.

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The RS Demon's venturi boosters are also removable. Old carburetor designs required epoxy to hold the swedged boosters in place so they wouldn't fall out when subjected to harsh racing vibrations. The Demon boosters utilize an ingenious double-locking design, with the booster held in place by the venturi sleeve and locked down with a nut that can't fall out when the metering block is in place.

Venturi Color And Size

All sizes shown are in inches
Color Venturi size Baseplate Airflow cfm
Orange 1.064 1 7/16 390
Green 1.280 1 11/16 675
Red 1.400 1 11/16 775
Blue 1.425 1 3/4 825
Gold 1.500 1 3/4 975
Black 1.562 1 3/4 1025
Silver 1.590 1 3/4 1050
Black w/ annular boosters 1 3/4 750
Silver w/ annular boosters 1 3/4 950

By The Numbers
A carburetor's metering block can intimidate even the most die-hard car buff. We thought this would be a good time to enhance your carburetor vocabulary and educate you in the inner working of the four-barrel. Note: most of the descriptions we've included here pertain to all carburetors using replaceable metering blocks.

Demon carbs utilize the tried-and-true, power-valve-enrichment circuit that we're all accustomed to. GPT300 incorporates power valve blow out protection in the entire Demon line. The tiny, pressed-in check ball is shown here in the black 1 3/4-inch RS Demon baseplate.

A new die-casting technique is used to produce smooth, concentric venturis in all Demon fuel meters. No longer is it necessary to hand polish the carbs to achieve maximum flow. This 1,175-cfm RS King Demon is ready to race, right out of the box.




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