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2003 Ford Focus RS8 Concept

2003 Ford Focus RS8 Concept

2003 Ford Focus RS8 Concept

Ford Racing Performance Parts (FRPP) used a sport-compact car to display the company’s latest addition to an already powerful crate engine line-up – a modified Focus RS converted to rear-wheel drive and V-8 power – with the introduction of the Focus RS8 at this year’s Specialty Equipment Market Association (SEMA) show.

Using the European Focus RS as a starting point, FRPP worked its engineering magic to mate its new, all-alloy, 5.0-liter 4-valve Cammer crate engine – cranking out a pavement-pounding 420 naturally aspirated horsepower – into the engine bay of the Focus.

Although a handful of aftermarket firms have successfully mated Ford V-8 power with a Focus, the RS8 was built to show the versatility of a Cammer crate engine and plug-and-play engine electronics installation in a pure stock-looking Ford Focus.

Ford’s Cammer V8

The foundation of FRPP’s hot new 5.0-liter Cammer crate engine is rooted in the Ford SVT Mustang Cobra 4.6-liter four-valve engine family. However, the crate motor’s flanged cylinder liners help provide 94mm (instead of 90.2mm) cylinder bores, creating a full 5.0-liters of piston displacement. And while the motor employs the 2003-04 SVT Mustang Cobra forged crankshaft with six-bolt mains and Manley H-Beam connecting rods for superior strength, the block itself is specially reinforced in the crankcase web areas for high torque loads.

2003 Ford Focus RS8 Concept

Other key differences include forged pistons, an 11.0:1 compression ratio, ported heads, higher-lift cams and beehive-shaped valve springs. The crate engine also features higher-flow fuel injectors and a magnesium variable-geometry intake manifold, similar to the FR500 intake manifold currently offered in the 2004 FRPP catalog.

Ford Racing’s new 5.0-liter Cammer crate engine comes with a stock SVT Mustang Cobra oil pan and exhaust manifolds, so an exhaust system – employing Ford Racing prototype metal-substrate catalysts and a set of Ford Racing dual-mode mufflers – was custom-fabricated to put the engine heat to the street.

One of the best parts about a Ford Racing 5.0-liter Cammer crate engine installation is that FRPP takes a lot of the guesswork out of the project by offering a choice of several length 5.0-liter 4-valve modular wiring harness kits that are created specifically to cover the most popular engine swap configurations. What’s more, harness kits – which include the powertrain control module (PCM) – provide all of the necessary electrical connectors, including end terminals, a fuse box, a power distribution box, as well as switch connectors and fuel pump relays. The 5.0L EFI Cammer crate engine, including the wiring harness kit, will sell for a MSRP of $14,995 and will be available from the 2004 Ford Racing Performance Parts catalog.

2003 Ford Focus RS8 Concept

Focus RS8

One look at the RS8 would suggest that its transformation from a production front-driver into a rear-drive pocket rocket was a study in simplicity. But in reality, Ford Racing engineers had their work cut out for them from the start.

Beyond fitting the drivetrain, there was the challenge of designing new suspensions front and rear. FRPP engineers put together a prototype setup inspired by Kugel Komponents up front, and a rear unit locating a Ford Racing 8.8-inch differential while offering adjustable ride height using Multimatic dampers. The newly-designed rear-wheel drive conversion kit will be sold through the FRPP catalog.

Four-wheel discs put the brakes on 18×8-inch European RS alloy wheels, wearing Michelin Pilot Sport 225/40 ZR18 tires up front and 255/45 ZR18s in the back.

Outside, the RS8 turns heads, thanks to the handsome European Focus RS styling cues and shimmering Blue Pearl Coat exterior paint treatment. Inside, the Focus RS provided the seating while Ford Racing chipped in with its Focus A-Pillar Gauge Pod and a full complement of Ford Racing Gauges.

2003 Ford Focus RS8 Concept Gallery

In Detail

submitted by Richard Owen
engine Aluminum Cammer V8
position Front Longitudinal
valvetrain DOHC 4 Valves per Cyl
displacement 5000 cc / 305.1 in³
bore 94 mm / 3.7 in
power 313.2 kw / 420 bhp @ 6700 rpm
specific output 84.0 bhp per litre
torque 501.65 nm / 370 ft lbs @ 5000 rpm
driven wheels RWD
front tires Michelin Pilot Sport 225/40 ZR18
rear tires Michelin Pilot Sport 225/45 ZR18
front brakes Discs
f brake size mm / in
rear brakes Discs
r brake size mm / in
front wheels F 45.7 x 20.3 cm / 18 x 8 in
rear wheels R 45.7 x 20.3 cm / 18 x 8 in
transmission Tremec five-speed HD
gear ratios :1
final drive 3.73:1

Story by Ford Motor Corporation, edited by