 |
|
| Author: |
| office |
| Description: |
| Were installing a set of three Demon 98 two-barrel carburetors on a 1961 Ford Starliner with a 292 Y-block engine. 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. |
|
|
 |
|
We’re installing a set of three Demon 98 two-barrel carburetors on a 1961 Ford Starliner with a 292 Y-block engine.
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 usually 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 fullthrottle 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. Further 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 preset 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 carburetors). 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.
6. Connect the primary (center) carburetor to the front carburetor with the shorter link and slip joint, using the hole centers on the throttle levers shown in figures 6A and 6B
7. Connect the primary (center) carburetor to the throttle linkage (from the pedal) with a suitable length link. Because this rod will vary in length, the user must make this connection to suit his application. Determine the correct length of the throttle link required, and make it from 5/16” bar, preferably stainless steel. Drill and tap each end 10-32, making one end left-hand thread, the other right-hand thread. 6A 6B
8. Tighten the five Allen bolts (10-32 x 7/8-inches long) to secure the linkages, leaving the jam nuts on the spherical bearings loose. Adjust the throttle plates of the three carburetors by first moving the center carburetor to the full-throttle position. Then rotate the short link between the jam nuts, bringing the front carburetor to full throttle also. Finally, synchronize the back carburetor by adjusting the lower rod between the outer carburetors, bringing it to the full throttle position. Next install the banjo fittings (9/16- inch x 24 T.P.I.) to the fuel bowls.
9. Install fuel lines as necessary. Period-style fuel lines and fuel distribution manifold are available from most hot rod speed shops.
10 & 11- Demon 98 carburetors accept period style air cleaners and air horns.
12- Alternatively, if you favor a Barry Grant billet fuel line, install and tighten the front and center carburetors, but leave the securing nuts of the back carburetor loose. Then install the fuel log, attaching it loosely to the fuel-bowl port of the back carburetor with the brass banjo bolt and two washers.
13- The next step is to install the brass banjo to the fuel bowl of the center carburetor.
14- Attach the remaining brass banjo to the fuel bowl of the front carburetor. Then tighten all three banjo bolts.
15- Finish the installation by tightening the rear carburetor to the intake manifold and connecting the fuel log to a fuel-delivery source
Barry Grant, Inc.
706-864-8544 Dept CSM
www.barrygrant.com
|
|
|
|
|
|
|
