Engine Maintenance and Modification Bradley Artigue

FIAT 124 Spider
Engine Maintenance + Modification
Figures
Figure 1: Engine Identification 9
Figure 2: Updraft Carburetor. 11
Figure 3: Air Bleed Correction. 12
Figure 4: Idle Speed Circuit. 13
Figure 5: Transition Stage. 14
Figure 6: Diaphragm-type accelerating pump 15
Figure 7: Offset choke 16
Figure 8: Mechanically controlled differential opening of the throttles. 17
Figure 9: Pneumatically controlled differential opening of the throttles 18
Figure 10: DHSA1 Carburetor Base Plate 19
Figure 11: DHSA 20
Figure 12: DHSA External Parts, Float Mechanisms, and Choke Assembly 21
Figure 13: DHSA Jetting, Throttle Mechanisms, and Internal Parts 21
Figure 14: Weber 40 IDF Carburetor Side View 22
Figure 15: IDF Normal Operation 22
Figure 16: IDF Progression 23
Figure 17: IDF Acceleration 24
Figure 18: IDF Cold Start Devices 24
Figure 19: IDF Dimensions 25
Figure 20: DMS Carburetor Side View 26
Figure 21: DMS Normal Operation 26
Figure 22: DMS Progression 27
Figure 23: DMS Acceleration 28
Figure 24: DMS Starting 29
Figure 25: DMS Dimensions 30
Figure 26: ADF Carburetor Side View 30
Figure 27: ADF Normal Operation 31
Figure 28: ADF Idle Speed and Progression 32
Figure 29: ADF Acceleration 32
Figure 30: ADF Starting 33
Figure 31: ADF Anti-Pollution Device 34
Figure 32: ADF Dimensions 35
Figure 33: Bosch L-Jetronic Fuel Injection as used in the FIAT Spider 2000. 39
Figure 34: Cold Start Operation in the Bosch L-Jetronic System 41
Figure 35: Warm-up Operation in the Bosch L-Jetronic System 42
Figure 36: Idle Speed Control in the Bosch L-Jetronic System 43
Figure 37: Idle speed controls on the Spider 2000 49
Figure 38: Primary Connections on the Electronic Control Unit 50
Figure 39: Primary Fuel Injection Circuits 51
Figure 40: Fuel Injection System Electrical Diagram 52
Figure 41.1: Intake 60
Figure 41.2: Compression 60
Figure 41.3: Ignition 60
Figure 41.4: Exhaust 60
Figure 42: Initial Ignition Setting 69
Figure 43: Final Timing (2000cc engine) 70
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