Allstar Performance ALL81222 - Manual (Page 2)

Allstar Performance 8300 Lane Drive, Watervliet MI 49098
Phone: (269) 463-8000 Fax: (800) 772-2618 www.allstarperformance.com
11. Reinstall or reposition the distributor hold down clamp, and then tighten until ready to set ignition timing.
12. Starting with the spark plug wire noted in step 4, position the cap on the distributor and install this spark plug wire on the
terminal that the distributor rotor is aligned to.
13. Attach the distributor cap.
14. Secure remaining spark plug wires one by one to ensure accuracy using original cap and marks from step 4 as a reference.
15. Reconnect battery cables. Be sure to hook up the NEGATIVE (-) cable last.
16. Set ignition timing according to manufacturers or engine builder’s specifications.
Distributor Final Connections
Included with distributor is a harness with a weather tight connec-
tor which allows easy connection to most vehicles with or without an
ignition control box. See Figure 2.
Centrifugal Advance Curve
A combination of springs, weights, advance stop bushing, and an ad-
vance cam make up the working parts of the centrifugal advance. By
changing springs and the advance stop bushing, this distributor will
operate in a wide range of applications.
Advance Curve
The function of advance curve is to match ignition timing to the burn-
ing rate of fuel and RPM of engine. Timing may need to be changed if
the burning rate of fuel or engine RPM are altered.
When selecting an advance curve, use as much initial advance as
possible without causing excessive starter load or engine kick back.
Start the centrifugal advance just above idle RPM. The starting point
of centrifugal advance curve is controlled by the installed length and
tension of the spring. Advance spring stiffness controls the rate of
the centrifugal advance slope. A lighter spring will provide a faster
advance curve. Advance bushing size controls the amount of advance.
A smaller bushing will produce a smaller amount of advance. The following factors will affect engine timing.
FORM 1032 Page 2 of 4 Rev.053013
Factor Delay Timing Advance Timing
Air & Fuel Mixture Lean Rich
Combustion Chamber Shape Compact Open
Combustion Turbulence High Low
Cylinder Pressure High Low
Octane Of Fuel Low High
Ignition Energy High Low
Load Heavy Light
RPM Low High
Spark Plug Location Centered Offset
Temperature Hot Cool
Vacuum Low High
FIG. 2