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some definitions
Backpressure Measure of the amount of resistance exhaust gases meet on their way out of the exhaust. A necessity on normally aspirated engines, but more of a hindrance on turbocharged engines
CVH Compound Valve angle Hemispherical head
OHC engine design developed by Ford in the late 80s. The forerunner to the Zeta/Zetec engine, it was available only in 8v SOHC variants but came in a wide variety of capacities and was turbocharged in the Mk3 and Mk4 Escort turbos, and the Mk3 Fiesta turbo. Hemispherical head design was modified in 1986 for carburetted engines to the "lean burn" type with heart-shaped combustion bowls for emissions regulations, despite restricting power output by approximately 4%. The last version was the PTE engine
DOHC Double Overhead Cam
More commonly seen on modern engines and older race-orientated engines. Design allowed for fine-tuning of inlet and exhaust cam timing, among other benefits way too complex for me to understand
Duratec Ford's new-fangled term for their world engines. Range includes the Zetec-R, V6 and American 4-pot engines iirc
EEC Electronic Engine Control
Fordism for the type of engine management system used. Usually followed by the version number, eg EEC-IV
EFi Electronic Fuel injection
Computer-controlled injectors add fuel directly into the inlet strake of each cylinder. Allows much finer control over the engine than traditional carburettors
Fraud aka Ford
Commonly-used term, mainly by people who went in a buy a screw only to be charged £85 or more. Most larger service counters have at least one trained paramedic on standby to resuscitate potential customers who suffer sudden heart failure at being told an air filter will cost them 3 months wages.
Fillet rolling A method of increasing the strength of metal parts, eg cranks, by compressing the structure of the metal around the load points
Flow rate (injectors) Usually measured in ccs per minute or hour
Measurement of the maximum amount of motion lotion the injector can flow. Strange how we pay so much just for a slightly bigger hole...!
HEGO sensor aka Lambda Probe
A highly sensitive heated sensor which measures the amount of oxygen in the exhaust gas.
Hybrid turbo See Turbo Technics' page about Hybrid turbos
iB5/BC/MTX75 gearboxes The differences and similarities are best explained here at www.zetecinside.com
MAP Manifold Absolute Pressure
Sensor which measures engine load by sensing the level of vacuum or boost in the inlet tract
OFAB/OFAC Management
OFAB management was fitted to the FRST in 1990, OFAC was fitted from 1990 to the end of the production run. Describes the code printed on the ECU. OFAB is not compatible with IFAC and vice versa. OFAB can handle a Weber-Marelli 3-bar MAP sensor by default, whereas OFAC has a 2 bar MAP as standard and that's your lot unless you wanna pay out silly money
OHC Overhead cam
Cam sits above valves instead of being mounted in the block, for example
PS Measurement of power output. Roughly equal to power in bhp
PTE Pent roof high Torque low Emission
Development of the CVH engine to meet 1994 emissions regulations running SEFi management. Good for 75ps. And the bin
SEFi Sequential Electronic Fuel injection
Unlike EFi, this injection system was developed for the Zeta/Zetec engines (and fitted to the PTE) and was designed with better reliability and fuel economy in mind, including support for a HEGO sensor and catalytic converter, as well as having to meet stringent 1992 emissions regulations
SOHC Single Overhead Cam
Traditional engine design - all valves opened by the same camshaft
Spark plug temperature Spark plugs are produced with different temperature codes indicating (I think) their ability to conduct head away from the electrode. The colder the plug runs, the better it will be at maintaining a spark under high boost
T2/T3/T34 turbo term used to indicate internal spec of a turbo
See Turbo Technics FAQ page
Zeta Fore-runner of the Zetec engine
Name typically applied to the Series 1 Zetec with DOHC on the cam cover
Zetec E First generation Zetec engine
Commonly referred to as the Series 2 Zetec. Identified by "Zetec 16v" embossed on bare aluminium rocker cover - see fiestaprojects for more info
Zetec R Second generation Zetec engine
Identified by plastic cam cover. Improvements over Series 2 included end-fed injectors, teflon -coated pistons, solid lifters, and revised sump and block design - see fiestaprojects for more info
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