Renault F7R Specifications
| Engine Model: Renault F7R |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 121.9 cu.in (1.99 L) |
| Rated Engine Power: 147-150 Hp (108-110 kW) at 6100 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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The Renault F7R is a 2.0-liter, inline-four, naturally
aspirated gasoline engine belonging to the F-Type family, a series of
powerplants developed by Renault in the late 1980s and 1990s. This engine holds
a legendary status among automotive enthusiasts, primarily for its role in the
Renault Clio Williams - a homologation special created to meet FIA Group A
rallying regulations. The F7R represented the culmination of Renault’s
development of the F-series engine, evolving from the 1.8-liter F7P through
increased bore and stroke dimensions to achieve the 2,000 cc displacement limit
required for competition.
The F7R is characterized by its cast iron cylinder block and aluminum alloy
cylinder head, a dual overhead camshaft (DOHC) valvetrain with sixteen valves,
and multi-point fuel injection. Its long-stroke design - 93.0 mm stroke with an
82.7 mm bore - prioritizes low-end and mid-range torque, a characteristic
well-suited to both road driving and rally competition. The engine incorporates
features developed for high-stress operation, including piston cooling oil jets
and an external oil cooler. While the road-going version produced 150
horsepower, the engine’s architecture proved capable of supporting substantially
higher outputs in racing configurations, cementing its reputation as one of the
most revered naturally aspirated four-cylinder engines of its era.
The F7R is a four-stroke, water-cooled, naturally aspirated inline-four gasoline
engine configured for transverse mounting in front-wheel-drive vehicle
architectures. Its long-stroke design emphasizes torque delivery across the
mid-range.
Engine Type: Inline-4, 4-cycle, water-cooled, naturally aspirated.
Displacement: 1,998 cc (121.9 cu.in).
Bore and Stroke: 82.7 mm (3.26 in) x 93.0 mm (3.66 in).
Compression Ratio: 10.0:1.
Valvetrain: DOHC, 16-valve (4 valves per cylinder) with belt drive.
Fuel System: Multi-point electronic fuel injection (MPFI).
Firing Order: 1-3-4-2.
Redline: 6,800 rpm.
Clio Williams (Phase 1, 2, 3)
Maximum Power: 110 kW (150 hp) at 6,100 rpm.
Maximum Torque: 175 Nm (129 lb-ft) at 4,500 rpm.
Megane I Coupe / Sport Spider
Maximum Power: 108-110 kW (147-150 hp) at 6,000-6,100 rpm.
Maximum Torque: 175-186 Nm (129-137 lb-ft) at 4,500 rpm.
The cylinder block is manufactured from gray cast iron,
a material selected for its durability, wear resistance, and vibration-damping
properties. The block features a closed-deck design, with the cylinder bores
fully enclosed by the water jacket structure at the top deck surface, providing
maximum cylinder head gasket clamping force and resistance to bore distortion
under high-rpm operation. Unlike many engines of its era, the F7R uses
non-sleeved, cast-in-place cylinder bores machined directly into the iron
casting.
The block incorporates a deep-skirt design extending below the crankshaft
centerline, enhancing structural rigidity and providing robust support for the
five main bearing caps. The main bearing caps are cast iron with a two-bolt
configuration. The block is configured for transverse mounting with integrated
engine mount brackets. A distinguishing feature of the F7R is the integration of
piston cooling oil jets - oil squirters - that direct a continuous spray of oil
to the underside of each piston crown, a feature developed to manage thermal
loads in high-stress driving conditions.
Block Material: Cast iron
Bore Diameter: 82.7 mm (3.26 in)
Main Bearing Caps: Cast iron, two-bolt design
Piston Cooling Jets: Active at all engine speeds
The cylinder head is constructed from aluminum alloy
and utilizes a DOHC valvetrain with four valves per cylinder - two intake and
two exhaust - actuated by bucket-type tappets. The camshafts are driven by a
reinforced rubber timing belt from the crankshaft, with an automatic
spring-loaded tensioner maintaining belt tension. Hydraulic lash adjusters are
integrated into the tappets, automatically maintaining zero valve clearance
throughout the engine’s operational life, eliminating the need for periodic
manual valve adjustments.
The F7R cylinder head features larger valves than the 1.8-liter F7P from which
it evolved. The intake ports are designed to promote high-flow characteristics,
while the exhaust ports are optimized for efficient gas evacuation. The
combustion chambers are of a pent-roof design with centrally located spark
plugs, optimizing flame propagation. The camshaft profiles in the F7R are more
aggressive than those in the F7P, with increased lift and duration to support
the engine’s higher power output.
Head Material: Aluminum alloy.
Valve Configuration: DOHC, 4 valves per cylinder with bucket tappets and
hydraulic lash adjusters.
Valve Diameter (Intake): 33.5 mm (1.32 in).
Valve Diameter (Exhaust): 29.0 mm (1.14 in).
Valve Stem Diameter: 6.0 mm (0.24 in).
Valve Seat Angle: 45 degrees.
Camshaft Lift (Intake): 8.9 mm (0.350 in).
Camshaft Lift (Exhaust): 8.9 mm (0.350 in).
The F7R employs a multi-point electronic fuel injection
(MPFI) system. Four fuel injectors are mounted in the intake manifold runners,
positioned to spray fuel directly onto the back of the intake valves. This port
injection design provides excellent air-fuel mixture preparation and maintains
intake valve cleanliness. The fuel system is controlled by an engine control
unit (ECU), with Siemens or Bendix systems used depending on the application and
market.
A fuel pump assembly located within the fuel tank supplies pressurized fuel to a
fuel rail. The ECU calculates injection pulse width based on input from the mass
airflow sensor or manifold absolute pressure sensor, throttle position sensor,
coolant temperature sensor, crankshaft position sensor, camshaft position
sensor, and oxygen sensor feedback to maintain optimal air-fuel ratios. A fuel
pressure regulator maintains constant fuel pressure relative to intake manifold
vacuum.
Injection Type: Multi-point sequential electronic fuel injection
Fuel Pressure: 255-294 kPa (37.0-42.6 psi) with vacuum line disconnected
Fuel Injector Resistance: 12.0-16.0 Ohms
Fuel Requirement: 91 octane or higher (Research Octane Number 95 recommended)
ECU: Siemens or Bendix systems depending on application
The lubrication system is a fully pressurized, wet-sump
design engineered for high-performance applications. A gear-type oil pump,
driven by the crankshaft, draws lubricant from a stamped steel or cast aluminum
oil pan through a mesh strainer. A full-flow, replaceable oil filter is mounted
externally, with a bypass valve that allows oil flow to continue if the filter
becomes restricted.
The F7R incorporates several features developed for high-stress operation.
Piston cooling oil jets - squirters - are integrated into the cylinder block,
directing a continuous spray of oil to the underside of each piston crown. An
external water-cooled oil cooler is mounted to the oil filter housing to
stabilize oil temperature during sustained high-load operation. Pressurized oil
is distributed through internal galleries to the crankshaft main bearings,
connecting rod bearings, camshaft bearings, hydraulic lash adjusters, and piston
cooling jets.
Oil Type: SAE 10W-40 or 5W-40 (API SJ, SL, or higher
Oil Capacity (with filter): 5.5-6.0 liters (5.8-6.3 US qt) including oil cooler
Oil Pressure (at 3,000 rpm): 294-392 kPa (42.6-56.9 psi)
Oil Pressure (at idle): 98 kPa (14.2 psi) minimum
Oil Pump Type: Gear-type, crankshaft-driven
Oil Cooler: Water-cooled, external
The cooling system is a pressurized, liquid-cooled
design engineered to manage the thermal load of a high-performance naturally
aspirated engine. A cross-flow aluminum radiator with an electric cooling fan
provides cooling capacity. A centrifugal-type water pump, driven by the timing
belt, circulates coolant through the cylinder block, cylinder head, heater core,
and external oil cooler.
A wax-pellet thermostat regulates coolant flow to maintain optimal operating
temperature, with a bypass circuit that allows the engine to warm rapidly. The
system is designed to provide uniform cooling across all four cylinders,
maintaining consistent thermal expansion across the cast iron block and aluminum
head interface. The cooling system incorporates a coolant recovery tank to
maintain system pressure.
Coolant Type: Ethylene-glycol based antifreeze with corrosion inhibitors
Coolant Capacity: 6.5-7.0 liters (6.9-7.4 US qt)
Thermostat Opening Temperature: 82-86 °C (180-187 °F)
Thermostat Full-Open Temperature: 95 °C (203 °F)
Radiator Cap Pressure: 88-108 kPa (12.8-15.7 psi)
Water Pump Type: Centrifugal, timing belt-driven
| Intake and Exhaust Systems |
Intake System: A two-piece plastic or aluminum intake
manifold with a plenum chamber sized to enhance mid-range torque. The intake
manifold incorporates resonance tuning to optimize cylinder filling across the
engine speed range.
Exhaust System: Stainless steel exhaust manifold with individual runners
collecting into a single downpipe. A heated oxygen sensor is mounted upstream of
the catalytic converter for fuel trim feedback, with a second sensor downstream
monitoring catalyst efficiency on later variants.
Distributorless ignition system with individual
pencil-type ignition coils on later variants; early variants utilize a
distributor-based system with a crankshaft position sensor. The ECU controls
ignition timing based on crankshaft position, camshaft position, knock sensor
feedback, and engine load. A knock sensor mounted on the cylinder block allows
the ECU to retard ignition timing under detonation conditions.
Overall Length: 580 mm (22.8 in)
Overall Width: 610 mm (24.0 in)
Overall Height: 690 mm (27.2 in)
Dry Weight (complete engine): 125 kg (276 lb)
Oil Change Interval: 10,000 km (6,000 mi) under normal
driving conditions.
Oil Change Interval: 5,000 km (3,000 mi) under severe or performance driving
conditions.
Oil Filter Change: At every oil change.
Timing Belt Replacement: 80,000 km (50,000 mi) or 5 years.
Engine Coolant Replacement: 60,000 km (40,000 mi) or 2 years.
Spark Plug Replacement: 40,000 km (25,000 mi) for standard plugs.
Spark Plug Replacement: 60,000 km (37,000 mi) for platinum plugs.
Spark Plug Type: NGK BKR6E or equivalent.
Spark Plug Gap: 0.8-0.9 mm (0.031-0.035 in).
Drive Belt (Accessory) Inspection: Every 10,000 km (6,000 mi) for tension,
cracking, and glazing.
Air Filter Replacement: 30,000 km (18,000 mi) or as indicated by inspection.
Fuel Filter Replacement: 40,000 km (25,000 mi) for external filter types.
Valve Clearance Adjustment: Not required due to hydraulic lash adjusters.
Idle Speed Adjustment: 800 ± 50 rpm with no electrical or accessory load.
Cylinder Head Bolts (M10 x 1.25), 1st pass: 20 Nm (15
lb-ft).
Cylinder Head Bolts (M10 x 1.25), 2nd pass: 60 Nm (44 lb-ft).
Cylinder Head Bolts (M10 x 1.25), 3rd pass: 80 Nm (59 lb-ft).
Main Bearing Cap Bolts (M10 x 1.25), 1st pass: 40 Nm (30 lb-ft).
Main Bearing Cap Bolts (M10 x 1.25), 2nd pass: 70 Nm (52 lb-ft).
Connecting Rod Cap Bolts (M9 x 1.0), 1st pass: 30 Nm (22 lb-ft).
Connecting Rod Cap Bolts (M9 x 1.0), 2nd pass: 60 Nm (44 lb-ft).
Camshaft Bearing Cap Bolts (M8 x 1.25): 20-25 Nm (15-18 lb-ft).
Intake Manifold Bolts (M8 x 1.25): 18-22 Nm (13-16 lb-ft).
Exhaust Manifold Nuts (M8 x 1.25): 18-22 Nm (13-16 lb-ft).
Spark Plugs: 20-25 Nm (15-18 lb-ft).
Oil Pan Bolts (M6 x 1.0): 8-10 Nm (71-89 lb-in).
Water Pump Bolts (M8 x 1.25): 18-22 Nm (13-16 lb-ft).
Timing Belt Tensioner Bolt (M8 x 1.25): 20-25 Nm (15-18 lb-ft).
Crankshaft Pulley Bolt (M14 x 1.5): 130-140 Nm (96-103 lb-ft).
Flywheel / Drive Plate Bolts (M10 x 1.25): 70-75 Nm (52-55 lb-ft).
The Renault F7R engine was utilized across a select
range of Renault’s performance-oriented and sport-focused models throughout the
1990s, primarily in European markets.
Renault Clio Williams (Phase 1, 2, 3): 1993-1996 (homologation special for Group
A rallying).
Renault Megane I Coupe (Phase 1): 1996-1999 (2.0-liter 16-valve variants).
Renault Sport Spider: 1996-1999 (mid-engined sports car).
Renault Laguna (Phase 1): 1994-1998 (2.0-liter 16-valve variants in select
markets).
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