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The HJ 5.0L was a very different engine to the HT-HQ 308 though. It got a raise in compression from 9:1 to 9.7:1 and got a new camshaft which was basically the same valve timing as used in the HK-HQ SBC engines (prior to HJ the 308 used the 253's smaller camshaft but retarded 5 degrees).
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 ...
1969–1984 Holden 253; 1969–2000 Holden 308 (stroke reduced in 1985, making it 304 cu in (5.0 L); 350 cu in (5.7 L) version also produced from mid 1994 for use by HSV) 1982–1995 Cadillac HT; 1990–1995 Chevrolet LT5 DOHC V8 (exclusive to the Chevrolet Corvette ZR-1) 1993–2010 Northstar V8 (also used in the Oldsmobile Aurora)
The first locally designed V8 Ford was the 1966 Ford Falcon (XR) and the first V8 Holden was the 1968 Holden HK, both using engines supplied by their parent companies in the United States. The first V8 engine to be mass-produced in Australia was the 1969–2000 Holden V8 engine. This cast-iron overhead valve engine used a V-angle of 90 degrees ...
The Holden straight-six motor is a series of straight-six engines that were produced by General Motors Holden at their Port Melbourne plant between 1948 and 1986. The initial Grey motor was so dubbed because of the colour of the cylinder block , later motors came in the form of a Red , Blue , Black , and the four-cylinder Starfire engine.
This engine uses continuously variable timing for the inlet valves. Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.
The GM High Feature engine (also known as the HFV6, and including the 3600 LY7 and derivative LP1) is a family of modern DOHC V6 engines produced by General Motors.The series was introduced in 2004 with the Cadillac CTS and the Holden Commodore (VZ).
In a piston engine, either a timing belt (also called a cambelt) or timing chain or set of timing gears is a perishable component used to synchronize the rotation of the crankshaft and the camshaft. This synchronisation ensures that the engine's valves open and close at the correct times in relation to the position of the pistons.
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