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Simpler camshaft drive system: OHV engines have a less complex drive system for the camshaft than OHC engines. [16] Most OHC engines drive the camshaft or camshafts using a timing belt, a chain, or multiple chains. These systems require the use of tensioners, which add complexity. In contrast, an OHV engine has the camshaft positioned close to ...
Some engines, such as the Fiat Twin Cam engine of 1964, began as OHV engines with an oil pump driven from a conventional camshaft in the cylinder block. When the twin overhead cam engine was developed, the previous oil pump arrangement was retained and the camshaft became a shortened stub shaft.
SOHC design (for a 1973 Triumph Dolomite Sprint) . The oldest configuration of overhead camshaft engine is the single overhead camshaft (SOHC) design. [1] A SOHC engine has one camshaft per bank of cylinders, therefore a straight engine has a total of one camshaft and a V engine or flat engine has a total of two camshafts (one for each cylinder bank).
All of this is side-show to what I said, that OHV engines (though more complex) are intrinsically more reliable than OHC engines. OHV can safely be drip or splash fed with oil (sometimes pushed through hollow pushrods without assistance from the oil pump). Whereas OHC engines have spinning bearings, so they're much more dependent on lubrication.
Offered also in 1967, the 230 cu in (3.8 L) OHC 6 shared internal dimensions with the overhead valve Chevrolet straight-6 engine it was based on, [citation needed] but had unique cast iron block and head castings. Only the large cam carrier/valve cover was aluminum. It used a jackshaft (outside of the block) for oil pump and distributor drive.
The '151E' engine used 4 valves per cylinder. [citation needed] The '100E' engine used twin spark plugs with 2 valves per cylinder but was used mainly by a Toyota works team. [citation needed] Italy Nova Corporation produced a 2.0 L engine based on the 2T-G that was used in most of the world F3 cars for a long time. [16] [17] [18] [19]
The original OHV three main-bearing Kent engine appeared in the 1959 Anglia with a capacity of 1.0 L (996.7 cc) developing 39 bhp (29 kW) at 5,000 rpm — unusually high for the time. With a 80.96 mm × 48.41 mm (3.19 in × 1.91 in) bore and stroke, combined with independent (non-siamesed) four intake and four exhaust ports, it was a departure ...
The engine block and associated components for the USA market Isuzu G-series engines were locally produced under license by a GM engine casting and assembly plant in Flint, Michigan. In South America an overhead-cam version was adapted, and later developed into a 1599 cc version with a 75.7 mm stroke. [18] 82 mm (3.2 in) 66.2 mm (2.61 in)
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