FIAT 124 Spider
Engine Maintenance + Modification
32
Figure 28: ADF Idle Speed and Progression
From primary well (30) fuel reaches idle jet (34) through duct (43): after emulsifying with
the air coming from calibrated bush (35), it flows through duct (42), calibrated bush (40)
— adjustable by screw (41) — and reaches the primary throat downstream of throttle
(23). The mixture reaches the primary duct also through progression holes (44) near the
primary throttle; this allows a smooth increase in engine angular velocity starting from
idle running.
By opening of secondary throttle (12), the fuel coming from the secondary well flows to
idle jet (36) through duct (38); after emulsifying with the air coming from calibrated bush
(37), it reaches, via duct (39), the secondary throat through progression holes (45).
Figure 29: ADF Acceleration
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