DOHC - Tuning for performance
Across the Sierra model range, there are generally speaking three types of “tunable” engine: the OHC 'pinto', the DOHC 16v Cosworth and the 12v V6.
That is to say, having been involved in motorsport to some degree or another, each of the engines can be tuned relatively easily due to an abundance of knowledge and tuning accessories.
The 8v DOHC engine used from late 1989 onwards is somewhat different.
Fitting a high-flow air filter element
An air filter is often one of the frequently overlooked service items that can really affect the performance and reliability of your car. Not only that, but a clogged one can really be bad for the environment.
DOHC - Creating a 2.3 8v hybrid
While the tuning options for the 2.0 DOHC engine are limited, one option that interested me was the creation of a 2.3 DOHC engine for the Sierra - using the bottom end from a 2.3 16v Ford Scorpio and a 2.0 DOHC 8v cylinder head.
Fitting replacement indicator side repeaters
Something I have never really understood is the thinking behind some of Ford's styling motives - side repeaters for one.