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 />
The block mounted distributor on Spiders made prior to 1971 has approximately 5<br />
degrees of fixed advance with a maximum of 29 degrees of variable advance. The<br />
advance increases in a linear manner to its maximum at 3500 RPM.<br />
The camshaft mounted distributor on the 1971-72 Spider has approximately 5 degrees of<br />
fixed advance with an additional 24 degrees of variable advance. The variable advance<br />
increases in a linear manner from approximately 0 degrees at 850 RPM to 31 degrees at<br />
4300 RPM.<br />
The 1974 – 1978 distributor has approximately 10 degrees of fixed advance with the first<br />
(starting) set of points <strong>and</strong> 0 with the second (running) set (at 850 RPM). Normal running<br />
occurs on the first of points, with centrifugal advance to a maximum 36 degrees at 3500<br />
RPM. The running points are activated when full oil pressure is reached <strong>and</strong> the water in<br />
the intake manifold passages begins to increase.<br />
Dave Voss, a FIAT owner who took the time to disassemble <strong>and</strong> underst<strong>and</strong> the<br />
differences in the 1979-1985 vacuum advance (electronic) distributors, noted the<br />
following:<br />
Given the age of these distributors, <strong>and</strong> the high likelihood that swaps <strong>and</strong> rebuilds have occurred<br />
along the way, your [electronic] distributor could be any one of 6 combinations:<br />
47º total = 33º mechanical + 14º vacuum<br />
43º total = 33º mechanical + 10º vacuum<br />
33º total = 33º mechanical + 0º vacuum (failed or disconnected)<br />
36º total = 22º mechanical + 14º vacuum<br />
32º total = 22º mechanical + 10º vacuum<br />
22º total = 22º mechanical + 0º vacuum (failed or disconnected)<br />
The distributor top plate, under the rotor, is stamped with the degrees of mechanical advance. The<br />
vacuum canister is also marked. Generally speaking the replacement parts available today are for the<br />
49-state version <strong>and</strong>, unless pinging or knocking occurs during operation, the 49-state is appropriate<br />
for all Spiders. The electronic system also fits earlier models <strong>and</strong> is often found under the hood of<br />
many older Spiders.<br />
To recap, ignition advance is a crucial concept in tuning. A recommended approach is to<br />
set your engine “by the book” <strong>and</strong>, as you underst<strong>and</strong> more about your vehicle <strong>and</strong> your<br />
driving needs, begin to adjust “by the ear” or to the maximum advance. FIAT<br />
distributors interchange easily between vehicles, so the advantages of an electronic<br />
system on an older motor may be appealing, or using a single-point distributor on a midyear<br />
Spider.<br />
9.5 Ignition Electrical Diagrams<br />
Note: These diagrams are excerpts from the electrical system diagrams I have produced<br />
for each FIAT Spider model year. The diagrams are available online at<br />
http://www.artigue.com/fiat.<br />
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