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The Chevrolet Gemini small-block engine is a dual-overhead cam (DOHC) V8 engine designed by General Motors.While technically a small-block engine because of its bore spacing of 4.4 inches, [1] [2] General Motors engineers do not consider it to be a part of the traditional Chevrolet small block lineage because of the substantial reworking, specialized development, and unique technical features ...
Toyota commissioned Yamaha to design the 2ZZ-GE, based on Toyota's ZZ block, for high-RPM operation and producing a power peak near the top of the RPM range. The high-pressure die-cast aluminum alloy engine block of the 2ZZ-GE featured cylinder walls with Metal Matrix Composite (MMC) , which is a reinforcement material composed of ceramic parts ...
For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
It generated 361 hp (269 kW) at 5,600 rpm and 385 lb⋅ft (522 N⋅m) of torque at 4,400 rpm using "regular" gas, or ~87 octane. Redline is 6,000 rpm and the compression ratio is 9.6:1. This engine uses L92 / LS3 style rectangle port cylinder heads, though without the sodium-filled exhaust valves of the LS3. Applications:
The shafts spin at twice the engine rpm, forcing the redline to be reduced from 6800 to 6500 rpm. Output is 150 bhp (112 kW) and 150 lb⋅ft (203 N⋅m). This was the only Quad 4 produced in 1995, and was known as a transitional year for the engine family. Applications: 1995 Pontiac Sunfire GT
A camshaft operating two valves. A camshaft is a shaft that contains a row of pointed cams in order to convert rotational motion to reciprocating motion.Camshafts are used in piston engines (to operate the intake and exhaust valves), [1] [2] mechanically controlled ignition systems and early electric motor speed controllers.
From 1994 to 1997, it used sequential port fuel injection, and made 210 hp (157 kW) at 5200 rpm and 215 lb⋅ft (292 N⋅m) of torque at 4000 rpm. In 1996, the heads were redesigned for better flow, as well as now making the engine an interference design and adapting the engine for federally mandated OBD-II emissions.
A helical camshaft is a type of mechanical variable valve actuation (VVA) system. More specifically, it is a camshaft that allows the valve opening duration to be varied over a wide, continuous, step-less range, with all of the added duration being at full valve lift.