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258 engine in a 1974 AMC Gremlin Engine bay of a 1980 AMC Spirit AMX with 258 and emissions controls The 258 cu in (4.2 L) was produced from 1971 through 1990. It featured an undersquare 3.75 in (95.3 mm) bore and 3.895 in (98.9 mm) stroke; it was otherwise similar to the 199 and 232 (Note: Starting in the mid-1970s the 258's bore and stroke ...
The CEC also controlled ignition timing using information from the fuel-control section and an engine knock sensor on the intake manifold. The CEC module itself (the most common version of which is the "AMC MCU Super-D") was manufactured for AMC by Ford Motor Company, and worked with a Duraspark ignition system. Although built by Ford, the CEC ...
The 2.7 differed from the 3.5 liter engine from which it was derived in many ways. The Magnum version featured a variable intake system to create a "supercharging" effect at different engine speeds. A three-row chain replaced the timing belt of the 3.5 liter engine, and the 2.7 in the LX also has electronic throttle control and an enhancement ...
The 1977 models incorporated engineering upgrades for the 258 six the year before to the 282 engine. All-new head design with quench-type combustion chambers took the compression ratio from 7.7:1 to 8.0:1. It was accompanied by a new aluminum intake manifold with improved flow while continuing the Holley 2300 two-barrel carburetor.
The 199 became 232 cubic inches and the 232 became 258. These two RB or "raised block" engines shared the small bell pattern of the earlier engines for only the 1971 model year. In 1972 both the 232 as well as the 258 changed bell pattern to match AMC V8s, in conjunction with AMC's switch from Borg-Warner to Chrysler-built automatic transmissions.
The way they do this is during a deceleration of the vehicle when there is low absolute pressure in the intake manifold (i.e., a high vacuum present in the intake manifold relative to the outside air) the powertrain control module (PCM) will open the EGR valve and then monitor the MAP sensor's values. If the EGR is functioning properly, the ...
The Bengals' defense has been a problem most of the season, but the Browns insist on giving Dorian Thompson-Robinson chances at quarterback, and that fixed a lot of Cincy's issues.
Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intake manifold of an engine. It is a measure of the amount of restriction of ...
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