Ford Demon1998 PDF Instruction Installation Manual

These fitting instructions will serve as a guide—they were created from procedures used to install a set of three Demon 98 two-barrel carburetors on a 1961 Ford Starliner with a 292 Y-block engine. Introduced to the hot rod market market in February 2008, the Demon 98 carburetors are produced in two principal forms: primary and secondary. The primary carburetor is responsible for starting, idling, modest off-idle acceleration,
and cruising. The purpose of the secondary carburetor(s) is to provide additional power when the primary carburetor assumes wider throttle openings. These primary and secondary carburetors interact via a throttle linkage system equipped with a slip joint. The secondaries usu-
ally begin to open when the primary throttle plates reach approximately 35 degrees, and because of a special high-ratio linkage, both the
primary and the secondaries assume the full-throttle position simultaneously.

Because the primary carburetor can provide sufficient power to keep the vehicle rolling, it will also give agreeable fuel economy at light throttle openings when the secondaries are not deployed. Adhering to current practice, the primary carburetor features four fuel-metering circuits, all of
which are adjustable. They are as follows: idle, main, accelerator-pump, and power valve. Fur- ther adjustments can be made to the float levels.
The secondary carburetor(s) feature both idle and main circuits, but have no provision for adjusting either idle speed or idle mixture—these are pre
set at the factory. However, adjustments can be made to the float levels and to the accelerator pump function.

1.Install all the base gaskets (supplied with car-buretors). These are positioned between the carburetors and the intake manifold. All the
gaskets are the same.
2. Set the first carburetor in place and secure it to its three-bolt fixings. This carburetor is known as a secondary carburetor.
3. Install the second carburetor, using a slight angle from the vertical if it is closely spaced to the first. Secure the carburetor to the intake
manifold by its three-bolt fixings. This carburetor is known as a primary carburetor.
4. Fit the third carburetor (another secondary type) by angling it into position, as shown, if the bolt-pattern layout is closely spaced.
5. Connect the outer carburetors with the 5/16- inch stainless steel throttle link and rod end bearings. One end is drilled and tapped to accept
a 10-32 right-hand spherical joint, the other end for a 10-32 left-hand joint. Left-hand threads are usually distinguished by a groove around the
end of the linkage rod.

Download Ford Demon1998 PDF Instruction Installation Manual