Renault F3P Specifications
| Engine Model: Renault F3P |
| Engine Type: 4-cycle inline 4-cylinder SOHC 8-valve liquid-cooled gasoline |
| Total Displacement: 109.5 cu.in (1.79 L) |
| Rated Engine Power: 88-113 Hp (65-83 kW) at 5500 rpm |
| Fuel System Type: Electronic Fuel Injection |
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The Renault F3P is a 1.8-liter, inline-four gasoline
engine belonging to the F-Type engine family, produced throughout the 1990s.
Developed as a mid-range powerplant for Renault’s larger hatchbacks and sedans,
the F3P served as a replacement for the earlier 1.7-liter F2N and F3N engines,
offering increased displacement, improved refinement, and a broader torque
curve. The engine was designed to balance power output with fuel efficiency,
occupying a position between the smaller E-series engines and the
higher-performance 16-valve variants of the F-series.
The F3P is a single overhead camshaft (SOHC) engine with eight valves - two
valves per cylinder - a configuration that emphasizes low- to mid-range torque
and mechanical simplicity. The engine utilizes a cast iron cylinder block with
an aluminum alloy cylinder head, a hybrid construction that provides durability
in the reciprocating assembly while reducing overall mass.
Fuel delivery is provided by either single-point (monopoint) or multi-point
(MPFI) electronic fuel injection depending on the application and market. The
timing system is belt-driven, and the engine incorporates a “non-sleeved” block
design where cylinders are bored directly into the cast iron casting. The F3P
was installed in the Renault 19, Clio I, and early Laguna I models, where its
combination of adequate power and reliable operation made it a popular choice.
The F3P is a water-cooled, four-stroke, naturally aspirated gasoline engine
configured for transverse mounting in front-wheel-drive vehicle architectures.
The engine was produced in multiple variants with differing fuel injection
systems and output calibrations.
Engine Type: Inline-4, 4-cycle, water-cooled, naturally aspirated.
Displacement: 1,794 cc (109.5 cu.in).
Bore and Stroke: 82.7 mm (3.26 in) x 83.5 mm (3.29 in).
Compression Ratio: 9.7:1 (single-point) or 9.8:1 (multi-point).
Valvetrain: SOHC, 8-valve (2 valves per cylinder) with belt drive.
Fuel System: Single-point (monopoint) or multi-point (MPFI) electronic
injection.
Firing Order: 1-3-4-2.
Idle Speed: 750 ± 50 rpm.
Engine Redline: 6,200 rpm.
Single-Point (Monopoint) Injection Variant
Maximum Power: 65-70 kW (88-95 hp) at 5,500 rpm.
Maximum Torque: 142-150 Nm (105-111 lb-ft) at 2,750-3,000 rpm.
Multi-Point (MPFI) Injection Variant
Maximum Power: 79-83 kW (107-113 hp) at 5,500 rpm.
Maximum Torque: 155-160 Nm (114-118 lb-ft) at 4,250 rpm.
0The cylinder block is constructed from gray cast iron,
a material selected for its exceptional rigidity, vibration-damping properties,
and long-term dimensional stability. The F3P utilizes a “non-sleeved” block
design, meaning the cylinder bores are machined directly into the cast iron
casting without replaceable liners. This design provides a rigid bore structure
with consistent cooling characteristics. The nearly square bore and stroke
dimensions - 82.7 mm (3.26 in) bore and 83.5 mm (3.29 in) stroke - create an
engine with balanced torque and power characteristics across the operating
range.
Cast-in-place cylinder bores are machined directly into the iron casting. The
block incorporates five main bearing webs with two-bolt main bearing caps. The
crankshaft is supported by five bearings and is constructed from cast iron. A
stamped steel oil pan is sealed to the lower crankcase, providing the oil
reservoir. The block design incorporates water passages optimized for uniform
cooling across all four cylinders.
Block Material: Gray cast iron
Bore Diameter (finished): 82.7 mm (3.26 in)
Main Bearing Caps: Cast iron, two-bolt design
Cylinder Bore Deformation Limit: 0.05 mm (0.0020 in)
The cylinder head is manufactured from aluminum alloy,
a selection that reduces overall engine mass and improves heat dissipation from
the combustion chambers. The SOHC valvetrain actuates eight valves - two valves
per cylinder - through a system of rocker arms. The rocker arms incorporate
adjustment screws for manual valve clearance setting. The camshaft is driven by
a reinforced rubber timing belt from the crankshaft, with an automatic
spring-loaded tensioner maintaining belt tension.
The combustion chambers are of a compact hemispherical design that promotes
efficient flame propagation. The cylinder head incorporates the intake and
exhaust ports in a cross-flow arrangement, with the intake manifold on one side
and the exhaust manifold on the opposite side. The engine is of interference
design; in the event of timing belt failure, valve-to-piston contact occurs.
Head Material: Aluminum alloy
Valve Configuration: SOHC, 2 valves per cylinder with rocker arms
Valve Diameter (Intake): 40.0 mm (1.57 in)
Valve Diameter (Exhaust): 34.0 mm (1.34 in)
Valve Stem Diameter: 7.0 mm (0.28 in)
Valve Seat Angle: 45 degrees
The F3P was produced with two distinct fuel system
configurations. The single-point (monopoint) injection variant utilizes a single
fuel injector mounted in a throttle body assembly positioned above the intake
manifold. Fuel is injected into the airstream as air passes through the throttle
body, with the fuel-air mixture distributed to the cylinders through the intake
manifold. This system provides a simplified fuel delivery architecture with
reduced component count.
The multi-point (MPFI) injection variant employs four fuel injectors mounted in
the intake manifold, positioned to spray fuel directly onto the back of each
intake valve. The port injection design provides more precise fuel metering per
cylinder, improved throttle response, and a slight increase in power output
compared to the single-point system.
A fuel pump assembly located within the fuel tank supplies pressurized fuel to
the injection system. The engine control unit (ECU) calculates injection pulse
width based on input from the airflow sensor, throttle position sensor, coolant
temperature sensor, crankshaft position sensor, and oxygen sensor feedback to
maintain optimal air-fuel ratios across all operating conditions.
Injection Type (Single-Point): Central fuel injection (throttle body injection)
Injection Type (Multi-Point): Multi-point electronic fuel injection (port
injection)
Fuel Pressure (Single-Point): 100-150 kPa (14.5-21.8 psi)
Fuel Pressure (Multi-Point): 255-294 kPa (37.0-42.6 psi)
Fuel Injector Resistance: 12.0-16.0 Ohms
Fuel Requirement: 87 octane (Research Octane Number 91) minimum
Fuel Cutoff: 6,200 rpm
The lubrication system is a fully pressurized, wet-sump
design utilizing a gear-type oil pump mounted to the front of the crankshaft.
The oil pump draws lubricant from the stamped steel oil pan through a mesh
strainer and circulates it through a full-flow, replaceable oil filter before
entering the main oil gallery. From the gallery, pressurized oil is distributed
to the crankshaft main bearings, connecting rod bearings, camshaft bearings,
rocker arm assemblies, and timing belt tensioner.
A pressure relief valve integrated into the oil pump maintains system pressure
within operational limits to prevent over-pressurization during cold starts. The
lubrication system is designed to provide adequate protection across the
engine’s operating temperature range with the specified oil viscosity.
Oil Type: SAE 10W-40, 15W-40, or 20W-50 (API SG, SH, or higher)
Oil Capacity (with filter): 4.5-5.0 liters (4.8-5.3 US qt) (variant dependent)
Oil Pressure (at 3,000 rpm): 294-392 kPa (42.6-56.9 psi)
Oil Pump Type: Gear-type, crankshaft-driven
Oil Filter Type: Spin-on, full-flow
The cooling system is a pressurized, liquid-cooled
design employing a cross-flow aluminum or copper-brass radiator with an electric
cooling fan. A centrifugal-type water pump, driven by the timing belt,
circulates coolant through the engine block, cylinder head, heater core, and
throttle body on some variants. A wax-pellet thermostat regulates coolant flow
to maintain optimal operating temperature, with a bypass circuit that allows the
engine to warm rapidly by circulating coolant only within the engine until the
thermostat opens.
The system is designed to provide uniform cooling across the cast iron block and
aluminum head interface, maintaining consistent thermal expansion
characteristics across the cylinder head gasket sealing surfaces.
Coolant Type: Ethylene-glycol based antifreeze with corrosion inhibitors
Coolant Capacity: 5.5-6.5 liters (5.8-6.9 US qt) (vehicle and variant dependent)
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: Cast aluminum or composite plastic
intake manifold with a plenum chamber sized to enhance mid-range torque. The
single-point variant uses a throttle body with a single injector and a
mechanically operated butterfly valve. The multi-point variant uses a throttle
body with a mechanically operated butterfly valve and separate fuel injectors
mounted at each intake runner.
Exhaust System: Cast iron 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.
Ignition System: Distributor-based ignition system with
a camshaft-driven distributor on early variants. Later variants employ a
distributorless ignition with individual coil packs. The system incorporates a
crankshaft position sensor and camshaft position sensor for precise ignition
timing control.
Timing Drive: A reinforced rubber timing belt with integral teeth drives the
camshaft from the crankshaft sprocket. An automatic spring-loaded tensioner
maintains belt tension. The timing belt is a scheduled maintenance item with a
defined replacement interval. The engine is of interference design.
Overall Length: 620 mm (24.4 in)
Overall Width: 610 mm (24.0 in)
Overall Height: 680 mm (26.8 in)
Dry Weight (complete engine): 125-135 kg (276-298 lb)
Oil Change Interval: 10,000 km (6,200 mi) under normal
driving conditions.
Oil Change Interval: 5,000 km (3,100 mi) under severe conditions.
Oil Filter Change: At every oil change.
Timing Belt Replacement: 60,000 km (37,500 mi) or 5 years.
Engine Coolant Replacement: 40,000 km (25,000 mi) or 2 years.
Spark Plug Replacement: 30,000 km (18,600 mi).
Spark Plug Type: NGK BPR6ES or equivalent.
Spark Plug Gap: 0.8-0.9 mm (0.031-0.035 in).
Drive Belt (Accessory) Inspection: Every 10,000 km (6,200 mi) for tension,
cracking, and glazing.
Air Filter Replacement: 20,000 km (12,500 mi) or as indicated by inspection.
Fuel Filter Replacement: 40,000 km (25,000 mi) for external filter types.
Valve Clearance Adjustment: Inspect and adjust every 40,000 km (25,000 mi).
Intake Valve Clearance: 0.10-0.15 mm (0.0039-0.0059 in) cold.
Exhaust Valve Clearance: 0.20-0.25 mm (0.0079-0.0098 in) cold.
Idle Speed Adjustment: 750 ± 50 rpm with no electrical or accessory load.
Cylinder Head Bolts (M10 x 1.25), 1st pass: 20-25 Nm
(15-18 lb-ft).
Cylinder Head Bolts (M10 x 1.25), 2nd pass: 50-55 Nm (37-41 lb-ft).
Main Bearing Cap Bolts (M10 x 1.25): 45-50 Nm (33-37 lb-ft).
Connecting Rod Cap Bolts (M8 x 1.0): 25-28 Nm (18-21 lb-ft).
Camshaft Bearing Cap Bolts (M8 x 1.25): 18-22 Nm (13-16 lb-ft).
Rocker Arm Shaft Bolts (M8 x 1.25): 18-22 Nm (13-16 lb-ft).
Intake Manifold Bolts (M8 x 1.25): 16-20 Nm (12-15 lb-ft).
Exhaust Manifold Nuts (M8 x 1.25): 16-20 Nm (12-15 lb-ft).
Spark Plugs: 18-22 Nm (13-16 lb-ft).
Oil Pan Bolts (M6 x 1.0): 8-10 Nm (71-89 lb-in).
Water Pump Bolts (M6 x 1.0): 8-10 Nm (71-89 lb-in).
Timing Belt Tensioner Bolt (M8 x 1.25): 18-22 Nm (13-16 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 F3P engine was utilized across a range of
Renault passenger vehicles throughout the 1990s, serving as a mid-range petrol
powertrain for these platforms.
Renault 19: RT, Baccara, and Cabriolet models (1990-1996).
Renault Clio I: RSi and Baccara trims (1991-1998).
Renault Laguna I: Early base models (1994-1997).
Renault Megane I: Select markets with F3P engine (1995-1998).
Renault Safrane: Early entry-level variants in certain markets.
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