Cosworth DFV Engine Specifications: The Cosworth DFV is a 90° V8, 4-stroke cycle, DOHC 4-valve/cylinder, even-fire, water-cooled, gasoline fuelled, race engine designed to be a stressed member of the chassis. It has 3550 parts.
The Cosworth DFV (Dual Four Valve) V8 engine for Formula One ("F1") cars was based on the FVA (Four Valve series A) development motor which was based largely on the Ford Cortina road car engine (Kent) block for Formula Two racing. The FVA and DFV were developed under the same contract from Ford, which provided the financing. The DFV shares a number of internal sizes with the FVA, which was completed first and served as the 'proof of concept' of the DFV design.
Designer(s): primarily Keith Duckworth (1933-2005) of Cosworth Engineering in 1966/1967 under contract to the Ford Motor Company (Mike Costin and Keith Duckworth were the principals in the formation of Cosworth in London, England in 1958)
First production: 1967
First Race: Dutch Grand Prix, Zandvoort, Netherlands, June 4, 1967: two entered, finished 1st (Jim Clark), DNF (Graham Hill, who was on pole).
Last Race: still active in historic and vintage racing.
Capacity: 182.6 in3 / 2993cc (to meet the 3 litre displacement limit in Formula One implemented starting in 1966)
Power: 408 brake horsepower @ 9000 rpm (debut - 1967)
439 hp (1970)
450 hp @ 10500 rpm (minimum - 1973 spec.)
465 hp (1977)
Torque: 245 ft·lb @ 8500 rpm (minimum - 1973 spec.)
Description: 90° V8 crankcase and cylinders cast together in aluminum. Wet cast iron cylinder liners sealed with O-rings. Steel, coated iron, and nikasil alloy liners were also tried. Nikasil alloy liners saved 8 lb in overall engine weight, and were standard by 1983.
Weight (with clutch): 370 lb / 168 kg
Overall width: 27.0" (686 mm)
Overall length: 21.5" (545 mm)
Bore: 3.373" / 85.674 mm
Stroke: 2.555" / 64.8 mm
Bore spacing: 4.100" / 104.1 mm
Deck height: 6.505" / 165.2 mm (crankshaft centerline to deck surface)
Crankshaft height: 5.23" / 132.8 mm (crankshaft centerline to external sump bottom)
Cylinder stagger: 0.375" / 9.5 mm (left ahead of right)
Materials: Cast aluminum block and head, forged steel crank and rods (earliest DFV cranks were billet), forged aluminum pistons, cast magnesium covers.
Firing order: 1-8-3-6-4-5-2-7
Compression ratio: 11.0:1 (approx.)
Fuel: 101 octane (M.M. - motor method) minimum
Rotation: clockwise when viewing front of engine
Mounting: At the rear end of the engine are suspension attachment points, and at the other are car attachment points at the top and bottom of the engine. The top chassis mounting bolts are part of the cam cover, and have 4 to 6 bolts per cover per end. The lower mounting bolts are part of a bracket bolted to the sump assembly. The lower bolts are located 9.0 inches (22.86 cm) apart. As the engine expands when it gets hot, the mountings are made so that the sheer forces are concentrated on the bottom bolts.
Serial numbers: The block serial numbers in the early years reflected the year the engine was built as the first digit, with two more numbers to indicated the unit number for that year. For example, DFV 701 was the first DFV built in 1967 and DFV 910 was the 10th DFV built in 1969. At a later date (likely circa. 1977 after 260 DFVs had been made) Cosworth went to sequential serial numbers; e.g. DFV 400 was the 400th DFV made (for Albert Obrist/Mario Hytten around 1986/87).
Description: single plane ("flat") common throw (2 rods per crank pin, no offset), forged nitrided steel (earliest cranks were billet steel), 5 main bearing crankshaft, hollow crank pins, weight 32 lbs / 14.5 kg, thrust taken on #3 main bearing, 8 bolts on flywheel flange.
Main journal diameter: 2.3755" to 2.3750" / 60.3 mm
Rod bearing diameter: 1.9370 to 1.9375" / 49.2 mm (same as Cosworth FVA: Bearing is Cosworth part number FA0067)
Connecting rod journal diameter: 1.9375" / 1.9370"
Crankshaft: End float: 0.004" / 0.009"
Connecting rod side clearance (big end): 0.006" / 0.012"
Description: forged aluminum, 4 valve notches. Full floating wrist pin.
Piston compression height: 1.469 / 37.3 mm
Weight: ~328 grams (with rings, without pin)
top: 0.0315"/0.80 mm
middle: 0.0410"/1.04 mm
oil: 0.160"/4.06 mm
Piston ring gap (all rings): 0.017" to 0.022"
Description: forged steel, H-beam, fully machined connecting rods.
Bolts: 3/8" UNF
Connecting rod length: 5.23" (132.842 mm)
Wrist Pin length: 2.500" (63.5 mm)
Wrist pin diameter: 0.812" (20.638 mm)
Wrist pin end float: 0.000" ± 0.001" (retained by clips)
Rod/Stroke ratio: 2.05
Description: Cast aluminum, dual over head cams (DOHC), 4 valves/cylinder. Central spark plug in pent-roof combustion chamber. Each cylinder head has a stub shaft for cam drive gear on one end. The cylinder heads are interchangeable left and right.
Fastening: 18 retaining fasteners per head - 6 surrounding each cylinder - 10 studs from block, 8 studs from head.
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