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 32: ADF Dimensions<br />
4.8.6 Weber ADHA<br />
The ADHA is similar to the ADFA except for the secondary barrel, which is vacuum<br />
controlled. This is a hard carburetor to love. Introduced with the 2000cc engine the<br />
ADHA was a small carburetor on the largest of the Spider motors. Although a carburetor<br />
with 23mm <strong>and</strong> 32mm barrels should be adequate for a 2 liter motor, the jetting, intake<br />
manifold, <strong>and</strong> array of pollution control devices both on <strong>and</strong> off of the carburetor resulted<br />
in a fairly uninspiring driving experience.<br />
4.9 Carburetor Tuning<br />
These are the recommended procedures per Weber with some modifications, you will<br />
find the same general steps in any publication on setting up carburetors. Should the<br />
engine fan come on during these steps STOP working (leave the engine running) until it<br />
shuts off. Fans draw current from the alternator, creating a load that will reduce engine<br />
speed <strong>and</strong> may cause you to make incorrect adjustments. Fans are also dangerous to<br />
work around.<br />
4.9.1 Set Carburetor to Factory Settings<br />
Back out the idle speed screw until it is no longer in contact with the throttle stop lever.<br />
Now turn the screw until it contacts the lever <strong>and</strong> again 1 ½ turns.<br />
Turn the idle mixture screw (on our carburetors it is typically in the center bottom of the<br />
carburetor body) in until it is fully seated - do not force the screw. Now turn it back out<br />
two full turns.<br />
4.9.2 Start <strong>and</strong> warm the <strong>Engine</strong><br />
Disengage or block the choke open. On automatic chokes you can use a small clamp or<br />
wire to pull the choke mechanism open. The engine should start <strong>and</strong> run poorly (if it<br />
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