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EGR valve the top of box on top of the inlet manifold of a Saab H engine in a 1987 Saab 90. In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide (NO x) emissions reduction technique used in petrol/gasoline, diesel engines and some hydrogen engines. [1]
To meet this goal, they turned to a newly developed Garrett turbocharger with a variable geometry vane system and installed an EGR valve. Learning from problems with injectors in the previous LB7, GM changed the valve covers to allow access to the injectors without having to remove the valve covers, saving significant labor costs if injector ...
A camshaft with 301/313 degrees of advertised duration, 0.407-inch (10.3 mm) net valve lift, and 76 degrees of valve overlap was specified for actual production engines in lieu of the significantly more aggressive Ram Air IV-spec camshaft that had originally been planned for the engine (initially rated at 310 hp (231 kW) with that cam), but ...
The recall in the U.S. covers certain Chevrolet Silverado and GMC Sierra 1500, 2500, and 3500 pickups from the 2020 through 2022 model years. ... say a transmission control valve can wear out over ...
The fire could spread to the nearby plastic spark plug wire retainers on the valve cover and then to the rest of the engine compartment. GM fitted the affected vehicles with redesigned spark plug wire retainers. [6] These engines were noted for having problems with the plastic upper intake manifold cracking around the EGR passage.
The General Motors 60° V6 engine family is a series of 60° V6 engines produced for both longitudinal and transverse applications. All of these engines are 12-valve cam-in-block or overhead valve engines, except for the LQ1 which uses 24 valves driven by dual overhead cams.
While this early effort to match the vacuum-controlled EGR volume more accurately to the engine's load made sense in a conventional engine, it had the effect of causing pinging (detonation) problems in the V8-6-4 engine, because four cylinders operating under higher load needed more EGR, while they were actually producing less exhaust flow and ...
But GM's Buick division had successfully lobbied corporate management to postpone Pontiac's engine until late 1954 in favor of Buick's release of its new overhead valve (OHV) V8 engine in 1953. A pushrod (OHV) engine with hydraulic lifters , the small-block was available with an optional four-barrel Rochester carburetor , increasing engine ...