what is required to swap a 4.6 2 valve to a 3 valve

The Ford 4.6L V8 engine, the first member of Ford's Modular overhead camshaft engine family unit in the production, was introduced in the 1991 Lincoln Town Motorcar. It was a 4.6-liter ninety-degree V-angle eight-cylinder gasoline engine with 2 valves per cylinder and SOHC design. Later, this engine became the base of operations V8 in the Mustang GT. Ford as well has been produced a 4-valve DOHC version well known past SVT Cobra and Mach 1 applications. This 32-valve DOHC iv.6L engine debuted in the 1993 Lincoln Marker Eight under name of 4.6L Four-Cam V8. The new Modular 4.6-liter V8 series replaced its pushrod-based predecessor - Ford's Modest Cake 5.0 H.O. engine.

Ford's 4.6L V8 has a deep-skirt aluminum or cast iron cylinder block (Romeo and Windsor castings), depending on model yr and application. While Windsor fe blocks have "Due west" letter and dowel pins at the cross-bolted main caps, Romeo 4.six iron blocks accept jackscrew cross-bolted main caps and are identified by "R" (only not all of them). Otherwise, they wait the same. Aluminum cylinder blocks were bandage at the Windsor Aluminum Plant (WAP) by the exception of older 90s Teksid blocks, which were bandage in Turin, Italy. Aluminum blocks came with 6-bolt main bearing caps.

The angle between cylinder banks is 90 degrees. Deck height is eight.937 in (227.0 mm), and cylinder bore spacing measures 3.937 in (100.0 mm). The engine cake features a about ane:1 bore-to-stroke ratio (square configuration) that positively affecting on its racket, harshness, and vibration characteristics. Connecting rod length is 5.933 in (150.7 mm). Modular engines were equipped with six- or eight-commodities crankshafts. Eight-bolt steel crankshaft was used in truck and high-operation applications, while vi-bolt crankshafts ordinarily were fitted in Romeo blocks under the hoods of passenger cars. All engines came with forged pistons and cracked powdered metal connecting rods from the mill.

The 4.6 engine can exist fitted with three types of aluminum cylinder heads: 2- valve (1990-2014) and 3-valve (2005-2010) with unmarried overhead camshaft (SOHC) valvetrain and 4-valve with dual-overhead-camshaft configuration. Single camshafts, every bit well as individual intake and exhaust camshafts in the iv-valve version, are driven past 2 timing chains (by one for each head). Valvetrain for all of them features low-friction roller rocker arms and hydraulic lash adjusters. The iii-valve cylinder caput features noon-shaped combustion chambers with a centralized spark plug, ii intake valves, and one large exhaust valve designed to improve velocity and book. iv.6 3V SOHC engines also were equipped with Ford's variable camshaft timing (VCT) arrangement. Ford 4.half-dozen 2v/3v engines feature the intake manifold made of blended material.

All 32-valve iv.6L DOHC engines had aluminum blocks only (except 2003-2004SVT Cobra, which had an atomic number 26 block with 4-bolt main begetting caps). Each cylinder has two intake and ii exhaust valves. The 1993-1998 four-valve heads characteristic individual intake port for each intake valve (split up-port blueprint). In 1999, cylinder heads were revised, and engineers implemented tumble-style intake ports where ane intake port feeds two intake valves. In that year, they too replaced the variable runner-length intake manifold by a stock-still runner-length intake manifold and inverse camshaft profiles.

Modular 4.6L V8s had a traditional sequential multi-port fuel injection arrangement controlled by ECU and mechanical/electronic throttle trunk. They too fitted with an electronically controlled, individual coil-on-plug ignition system.

The 4.6-liter 4-valve V8 engine featured on Ward's 10 Best Engines List for 1996 and 1997 years, while the 3-valve version was on the list for 2005-2008 and received a variety of accolades. Using this engine every bit a base, Ford developed a bigger 5.four-liter engine series, which also gained good success in sales. The production of the 4.6L Modular engine was discontinued in 2014. The last engine of the line was a 4.six 2v engine for a 2014 model year Ford Due east-Series van. By that time, the new Modular 5.0L Coyote engine, its successor, already had been produced for iii years.

Engine Specs

Manufacturer

Romeo Engine Plant in Romeo, Michigan;
Windsor Engine Establish in Windsor, Ontario;
Essex Engine Plant in Windsor, Ontario

Production years

1991-2014

Cylinder block material

Aluminum, Bandage iron

Cylinder head material

Aluminum

Fuel system

Sequential multi-port fuel injection

Valves per cylinder

2/iii/4

Valvetrain layout

SOHC/DOHC

Bore, mm

90.2 mm (3.55 in)

Stroke, mm

90.0 mm (three.54 in)

Deportation, cc

4,601 cc (280.8 cu in)

Type of internal combustion engine

Iv-stroke, naturally aspirated/supercharged

Compression Ratio

ix.0:ane - 1990-2000 SOHC ii-valve engine;
9.375:one - 2000+ SOHC two-valve engine;
nine.8:1 - SOHC three-valve engine;
9.85:1 - 1996-1998

Power, hp

190-260 hp (142-194 kW)/four,400-4,750 - two-valve SOHC;
292-315 hp (218-235 kW) - three-valve SOHC;
280-390 hp (209-291 kW) - 4-valve DOHC

Torque, lb ft

260-302 ft-lb (353-409 Nm)/3,250-four,000 - 2-valve SOHC;
315-325 ft-lb (427-441 Nm) - 3-valve SOHC;
265-452 ft-lb (359-613 Nm) - 4-valve DOHC

Firing order

1-3-7-2-half dozen-v-4-eight

Engine oil weight

SAE 5W-20

Engine oil chapters, liter

5.vii l (6.0qts) with oil filter

Oil change interval, mile

v,000 (x,000 km)/6 months

Applications

4.6 2V: Lincoln Town Car (Touring Sedan), Ford F-Series, Ford E-Serial, Ford Mustang GT, Ford Crown Victoria, Ford Thunderbird, Ford Explorer, Mercury Mountaineer, Mercury Thou Marquis, Mercury Cougar, MG ZT 260, Rover 75 V8, Mobility Ventures MV-1.
4.6 3V: Ford Mustang GT, Ford Mustang Bullitt, Ford Explorer Sport Trac, Ford Explorer, Ford F-Serial, Mercury Mountaineer.
four.6 4V: Ford Mustang SVT Cobra, Ford Mustang Mach one, Lincoln Marker VIII, Lincoln Continental, Lincoln Aviator, Mercury Marauder, Marcos Mantis (GT), Panoz AIV Roadster, Panoz Esperante, MG Ten-Ability SV, Koenigsegg CC8S, Koenigsegg CCR V8.

Ford 4.6 V8 Modular Engine Issues and Reliability

Ford's Modular 4.6 V8 has earned a highly positive reputation amidst owners in terms of reliability and longevity. The engine tin easily run well over 200,000 miles. Some taxi services used Crown Victorias with 4.6 V8 until impressive 300,000 or even 400,000 miles. But of course, ideal engines do not exist, and this engine has several mutual problems and designed flaws that currently are widely known.

The first widespread trouble is plastic intake manifold keen. This problem tin can exist found in iv.6L SOHC two-valve engines produced from 1996 to 2001. In that menstruum, Ford used a nylon composite intake manifold manufactured by DuPont, this manifold was decumbent to failure without whatever alert or sign. The reason is the intake manifold could not handle stress on the fabric caused by thousands of heat/absurd cycles (expansion and wrinkle) and boosted forces/vibrations coming from the alternator bracket mounted right into the plastic. As a result, this manifold can crack and split, the heater hose and coolant temperature sensor can loosen, which would result in an engine coolant leak and vehicle overheating. Tardily in 2001, Ford replaced the all-plastic manifold with a revised intake manifold that uses cast aluminum at the failure points.

A short thread depth in the aluminum cylinder heads is the root of the second mutual problem - stripping of cylinder head spark plug threads. Be conscientious while changing spark plugs on any Ford 4.6 V8s, equally it is so piece of cake to over-torque them and striping threads. Ford recommends a threaded insert every bit the method to repair stripped thread and even provides a tool kit specifically for that.

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Source: https://www.motorreviewer.com/engine.php?engine_id=186

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