A masterwork of modern engineering, Buick Rainier’s available V8 engine is filled with innovations. Its large displacement cast aluminum block and cylinder heads save weight while they also help provide the strength to generate class-leading* power. 300 hp and 330 lb-ft torque: That kind of power and torque gives you the freedom to haul or tow heavy loads and still have enough power in reserve to pass and maneuver with confidence. Displacement on Demand: This sophisticated technology allows the 5.3L engine to deliver V8 power when it’s needed and better fuel economy when it isn’t. The engine control module (ECM) measures load conditions from driver input and many vehicle sensors. When loads are light and little power is required, the ECM deactivates four of the eight cylinders and the engine effectively operates as a V4 for improved fuel economy.
When the driver demands more power, or load and road conditions require it, the ECM seamlessly reactivates the other cylinders for full V8 power. It all happens in mere milliseconds, and it’s so smooth it cannot be detected by Buick Rainier’s driver or passengers.
Buick Rainier Owner’s Manual
All-wheel drive vehicles require an extra differential to transmit power to the front wheels. This can force designers to mount the engine higher than they would prefer, resulting in compromised sightlines and a higher center of gravity. Rainier all-wheel drive models have a pan-axle oil pan. The front axle runs right through this unique oil pan, allowing our engineers and designers to keep the engine mounted low in the chassis. That allows better sightlines from the driver seat. It also lowers Rainier’s center of gravity and aids in increased stability on the road.
Rainier’s standard power comes from a state-of-the-art engine that incorporates advanced design and technology virtually everywhere you look. 24 valves, dual overhead cams: The more intake and exhaust valves an engine has, the easier it can breathe. That is to say, the easier it can draw the fuel/air mixture into the combustion chambers, and the easier it can expel the spent gases of combustion.
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With dual overhead cams controlling four valves per cylinder and variable exhaust valve timing, this engine breathes very well indeed. All of which results in better efficiency, better fuel economy* and more power. 291 hp/277 lb-ft torque – it outperforms many V8s: See what deep breathing can do? It gives our 4.2L L6 the kind of power and torque many V8s will envy.
But as important as having power is, it’s even more important to have that power over a broad range of engine speeds and driving scenarios. Natural balance: Of all the wonders of Rainier’s remarkable 4.2L engine, this is a quality you’ll probably appreciate every single day. This inline six-cylinder engine has a natural balance that virtually eliminates shaking and roughness at idle or any speed.
Sometimes you need power coming off a stoplight. Or when you need to make a low-speed pass. Or while making a high-speed pass. The fact is, there are many times when you need all the power your engine can muster. An engine with an extended torque curve addresses those needs. And with 90% of its torque available between 1,600 and 5,600 rpm, and peak torque at 3,600 rpm, Rainier’s 4.2L L6 can deliver the power to make you feel confident in virtually any driving situation.
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Some SUVs have unitized body construction – where the body itself must provide much of the strength of the vehicle. Our engineers think that’s fine for some SUV applications, but not for this Buick. So Rainier has a tough body-on-frame structure a body firmly mounted to a full frame. Rainier gives its drivers world-class ride and handling and high standards in noise isolation. Rainier’s chassis design also incorporates fully hydroformed side rails along the entire length of the frame. Hydroforming uses the power of pressurized fluid sealed in a hollow round steel frame rail to help precisely form the shape of the rail for consistent steel wall thickness and dimensional control.