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However, in 1991, USAC quietly lifted the requirement, and purpose-built pushrod engines were permitted to be designed for racing at the onset. Attempting to create an equivalency formula, [14] both pushrod engine formats were allowed increased displacement (209.3 cid vs. 161.7), [13] and increased turbocharger boost (55 inHG vs. 45 inHG) [13]
An overhead valve engine, abbreviated (OHV) and sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with flathead (or "sidevalve") engines , where the valves were located below the combustion chamber in the engine block .
The ratio is determined by the ratio of the distances from the rocker arm's pivot point to the point where it touches the valve and the point where it touches the pushrod/camshaft. A rocker ratio greater than one essentially increases the camshaft's lift. Current automotive design favors rocker arm ratios of about 1.5:1 to 1.8:1.
The head itself was flat with each engine capacity (1.1 and 1.3 L (1,098 and 1,298 cc)) featuring different pistons with different sized bowls in 681F and 711M blocks. The 1.6 L (1,599 cc) 691M block had the stronger 'square' bearing caps later used in the 711M, and small combustion chambers in the near-flat head (the bulk of the volume being ...
Introduced with the models in 1982, the 1.8 used a two-barrel Rochester carburetor and produced 88 hp (66 kW) and 100 lb⋅ft (140 N⋅m) of torque. Since peak output came on at higher RPM, acceleration in these cars was quite sluggish, with a test 1982 Pontiac J2000 accelerating from 0–60 mph (0–97 km/h) in 16.3 seconds, with a 1 ⁄ 4 ...
A 3.8 L V6 with SPI was introduced in the 1996 Windstar. With a compression ratio of 9.3:1, this engine was rated at 200 hp (149 kW) at 5000 rpm and 230 lb⋅ft (312 N⋅m) of torque at 3000 rpm. The upper intake manifold has a sticker located on the passenger side of the forward plenum denoting "Split Port Induction".
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