Metering Systems; Idle System - Edelbrock Performer Series 1403 Owner's Manual

1403-1413 Perf Series Carburetor Owner's Manual.qxd
Lean
17.0
16.0
A
15.0
/
F
14.0
R
A
13.0
T
I
12.0
O
11.0
Rich
10.0

METERING SYSTEMS

The Edelbrock carburetor has three (3) basic systems that meter fuel to the engine: The Idle System,
Primary Main System, and Secondary Main System. By understanding the operation of each you will
be better prepared to calibrate your carburetor.
Idle System: The Idle System delivers 100% of the idle fuel. It also meters fuel at off-idle throttle
positions; a large percentage at just off of idle decreasing to a minor influence as the throttle is
opened wider. The idle setting is critical both to a smooth idle at proper rpm and to a smooth
transition to part-throttle operation.
(1) Main Jet and
Metering Rod

Idle System

Figure 2
Part-throttle cruise
Part-throttle acceleration
X
Idle
Wide open throttle
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
Engine RPM
Typical Engine A/F Ratios
Figure 1
(4) 1st Idle Air Bleed
(2) Primary Well
3
3/31/2006 12:02 PM
(5) Idle Channel Restrictor
(6) 2nd Idle Air-Bleed
Edelbrock Performer Series Carburetor Owner's Manual 8/94
Page 3
(3) Idle Jet
(7) Transfer Slot
(8) Idle
Screw
Port