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The cause is the design of the crankcase ventilation circuit, which Ford revised several times over the engine's lifetime but never completely cured. Due to this, camshaft and tappet wear problems are common. A worn camshaft can cause heavy clattering and ticking from the engine's top end, especially at high engine speeds. [8]
The firing order has been changed from that shared by all previous Modular V8s (1-3-7-2-6-5-4-8) to that of the Ford Flathead V8 (1-5-4-8-6-3-7-2). [17] Compression ratio is 11.0:1, and despite having port fuel injection (as opposed to direct injection ) the engine can still be run on 87 octane gasoline.
This problem did not appear until the engine had over 50,000 miles (80,000 km) on it. By late 1956, many Olds dealers learned about the problem. Compression was up again in 1956 for 230 hp (170 kW) and 340 lb⋅ft (460 N⋅m) in the 88 and 240 hp (180 kW) and 350 lb⋅ft (470 N⋅m) in the Super 88 and 98.
The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [62] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Other upgrades of Vortec 8100 include a new 18-bolt head bolt pattern, longer connecting rods, different symmetrical intake ports, different oil pan rails, and the use of metric threads throughout the engine.
The 351W had larger main bearing caps, thicker and longer connecting rods, and a distinct firing order (1-3-7-2-6-5-4-8 versus the usual 1-5-4-2-6-3-7-8, a means to move the unacceptable "noise" of the consecutively-firing adjacent front cylinders to the sturdier rear part of the engine block all while reducing excessive main bearing load ...
This engine is very similar to later versions of the 221 engine. As the V8-09A in 1940, compression, power, and torque were unchanged; in 1941, the V8-19A compression and power were static, but torque rose by 6 lb⋅ft (8 N⋅m), while the 1942 V8-29A increased compression to 6.4:1 and power to 100 hp (75 kW), while torque stayed the same. [ 19 ]
Engine and chassis GT-40-style 5.0 L Cobra V8 engine (versus High Output 5.0 L V8 on GT). 13-inch vented front disc brakes, 11.65-inch rear discs with dual-piston calipers, and standard ABS (versus 10.8" vented front discs, 10.5-inch rear discs with single-piston calipers, and optional ABS on GT).
The 4.0 L SOHC V6 engine found on second, third, and fourth generation Explorers was notorious for the plastic OEM timing chain guides, cassettes, and tensioners breaking resulting in timing chain ticking, rattle or "death rattle". This problem can occur as early as 45,000 mi (72,000 km) in some vehicles.