Engine Maintenance and Modification Bradley Artigue
FIAT 124 Spider Engine Maintenance + Modification - Artigue.com
FIAT 124 Spider Engine Maintenance + Modification - Artigue.com
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FIAT 124 Spider<br />
<strong>Engine</strong> <strong>Maintenance</strong> + <strong>Modification</strong><br />
Figure 20: DMS Carburetor Side View<br />
The DMSA <strong>and</strong> DMS are popular upgrades for DHSA owners. Problems with the<br />
vacuum-operated secondary unit (typically stemming from a misunderst<strong>and</strong>ing of how it<br />
works) would lead to cars that ran poorly. The DMS, with a direct mechanical<br />
connection between the throttle plates, eliminated these problems. As DHSA<br />
carburetors wore out they were often replaced with br<strong>and</strong> new DMS units.<br />
Figure 21: DMS Normal Operation<br />
Through needle valve (1) fuel passes into bowl (17) where the float (18) hinged on pivot<br />
pin (20) sets the needle (2) opening to keep level constant: the needle (2) is connected to<br />
float tab (18) via return hook (19). From bowl (17) through main jets (16) fuel reaches<br />
well (15). After mixing with the air from orifices of emulsion tubes (14) <strong>and</strong> air corrector<br />
jets (5), through nozzles (9) fuel reaches the carburetion area consisting of auxiliary<br />
venturis (10) <strong>and</strong> main venturis (11). This carburetor is provided with a mixture-enriching<br />
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