1/20/2012
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Company: Demon Carburetion
www.demoncarbs.com
New Four-Barrel Carburetors
Three Different Sizes, Available With Mechanically or Vacuum-Operated Secondaries
Demon Carburetion has introduced six new and improved four-barrel
carburetors in the following sizes: 650, 750, and 850. Known as Speed Demons,
each size is available in two forms: three are equipped with mechanically
operated secondary throttle plates; the remaining three with vacuum-operated
secondaries.
Vacuum-operated secondary
throttle plates are ideally suited to engines with automatic transmissions
lacking high-speed stall converters. Alternatively, carburetors with mechanical
secondaries are preferable for vehicles with manual transmissions or automatics
with higher stall-speed converters, operating at 2,500 to 2,800rpm.
Vacuum-secondary Speed Demons are instantly recognizable by the red billet
aluminum cap on the vacuum pod.
Speed Demons are classified
as general performance entry-level downdraft carburetors. Featuring down-leg
boost venturii, they replace most standard square-flange carburetors on engines
with camshaft durations of up to 240 degrees @ .050˝ of valve opening. The 650
model performs at its best on mildly tuned engines with displacements of 302 to
427cu in. The larger 750 Speed Demon works exceptionally well on 393 to 477cid
engines and excels on mildly tuned engines from 427 to 455cu in. The largest
carburetor of this new Speed Demon range, the 850, is particularly well-suited
for operation on big-block crate motors, ranging in displacements from 488 to
540cu in.
All vacuum-secondary Speed
Demons are supplied with electric chokes. However, mechanical-secondary units
have provision for optional choke mechanisms. If desirable, these can be
purchased in either manual or electric styles.
Both vacuum and mechanical Speed
Demons are supplied with an integral kick-down mechanism that accepts Ford’s transmission
linkage. Other key upgrades include Demon’s billet metering blocks and base
plates complete with Idle-Eze™, a useful air valve that allows you to set the
idle speed without disturbing the throttle plates from their correct location. Throttle
plates are mounted on Teflon-coated throttle shafts. Crucially, four-corner
idle circuitry, high-flow choke tower, and power valve backfire protection are
provided to complete the package. Finished in silver die chromate, Speed Demon
tuning parts are interchangeable with similar carburetors of other manufacture.
For more information, contact Demon Carburetion at (270) 438-2039 or
visit
www.DemonCarbs.com.