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 />
11. Improvements*<br />
* Ask yourself if things need improving.<br />
Performance is a relative term. You need to define how you want your engine to<br />
perform so that it suits your needs. A high performance engine is not necessarily fast<br />
<strong>and</strong> a poorly performing engine is not always slow. Lots of car companies state that<br />
their engines are “high performance” just because they produce more than “x”<br />
horsepower or “y” torque. But look at what these companies do to produce this power -<br />
enormous V6 <strong>and</strong> V8 engines that barely produce ¾ of a horsepower per inch of engine<br />
displacement. These can be 350 <strong>and</strong> 400 cu. in engines producing less than 300 HP.<br />
Alfa Romeo <strong>and</strong> FIAT were producing 1HP per cubic inch of displacement in the 1960’s.<br />
Sure, the engines produced around 100 to 120HP, but which one is higher performance?<br />
It's up to you to define performance in terms of what you want your car to do.<br />
Performance is relative to your needs.<br />
Do you want to build a 200HP Spider? It can be done, with a st<strong>and</strong>ard FIAT engine<br />
block, cylinder head modifications, high compression pistons, lightened flywheel <strong>and</strong><br />
connecting rods, supercharging, etc. Guy Croft has been building race-prep FIAT twincam<br />
motors from his shop in the United Kingdom for many years. He wrote a book on<br />
the subject (which is now quite hard to find) in case you want to do it all yourself, or you<br />
can pay upwards of $8,000.00 to get it done right by Guy personally. Alternatively, there<br />
are numerous things you can do with a relatively stock FIAT Spider <strong>and</strong> really improve<br />
your driving experience. The interchangeability of parts between model years allows you<br />
to use off-the-shelf FIAT parts to truly transform your Spider.<br />
The good news is that many Spider parts can be interchanged between engine series or<br />
upgraded with new parts. These interchanges can be done to improve things such as<br />
acceleration, horsepower, <strong>and</strong> torque. Parts availability <strong>and</strong> installation ease are both<br />
very good; in other words, you may be able to mix <strong>and</strong> match parts at a minimal expense<br />
<strong>and</strong> create an improved driving experience. This section deals with some improvements<br />
that have been proven to be successful in delivering improved performance <strong>and</strong><br />
reliability.<br />
You should approach performance improvements with some caution. There is a financial<br />
trap you can easily fall into, with your improvements quickly reaching the point of<br />
diminishing returns. A set of new carburetors, head work, pistons, camshafts seals,<br />
rings, <strong>and</strong> all of the other parts can easily set you back three or four thous<strong>and</strong> dollars. It<br />
is very easy to say “since I’m pulling the motor anyway, I’ll go ahead <strong>and</strong> install new,<br />
high compression pistons <strong>and</strong> those lightened connecting rods.” Consider that your<br />
tired engine may improve dramatically by rebuilding to stock (or near stock). There are<br />
exceptions, such as the Spider 2000 fuel system, but for the most part these cars were<br />
very nice performers in stock form, <strong>and</strong> some relatively inexpensive changes may meet<br />
all of your needs.<br />
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