Lehmer's Buick-GMC Fleet & Commercial Department

10/22/22

First Ever Sierra EV Denali | “The Denali of EVs” | GMC

Introducing the next all-electric supertruck - the GMC Hummer EV SUV. If you thought one could change the world, imagine what two can do. Reserve yours now at GMC.com/HUMMEREV Simulated vehicle shown. Actual production model may vary. Initial availability early 2023. Limitations apply. At participating dealers.

10/20/22

New 2023 Sierra AT4X | Outside & In | GMC

Introducing the New 2023 GMC Sierra AT4X—the Peak of Premium Off-Roading. Equipped to conquer the great outdoors and welcome you to the great indoors. Part of the New Sierra lineup of exceptionally premium and capable vehicles.

10/17/22

CURT 5th Wheels Introduction

We’re electrifying the future for business. The zero-emission 2022 E-Transit is joining our EV lineup, leading the charge for commercial customers into an electrified, more sustainable future. *Preproduction vehicle shown. Available late 2021. Learn more about the 2022 Ford E-Transit here: https://ford.to/3lnXodE

10/15/22

Hellwig Suspension - How Helper Springs Work

How Helper Springs Work - Dealers for more info and to order, log on to priceguidepro.com or contact your sales rep today! 800.772.2678

10/14/22

How V8 Engines Work - A Simple Explanation

V8 engines operates under the same basic principles as any other gasoline four-stroke engine. First the piston pulls in air and fuel as it moves downward, then it compresses that air and fuel as the piston moves upward. A spark plug fires, igniting the air/fuel mixture and forcing the piston downward. Finally the piston pushes out the exhaust gases on its way back up, before for the cycle repeats itself.

In a V8 engine, this cycle is happening in 8 different cylinders, at different times. Instead of multiple cylinders firing at the same time, you want them to be spread out so that power delivery is smooth. For this Chevy V8, the firing or is 1, 8, 7, 2, 6, 5, 4, 3. With 8 cylinders, there is a cylinder firing for every 90 degrees of the crankshaft rotating, which means at any point in time, there are two cylinders on the power stroke.

With regards to the valvetrain, the intake air comes from the top of the engine, and into the sides of the cylinder head. The exhaust flows to the sides of the engine, exiting the exhaust valves from the cylinder head. In this LS3 model, there is a single intake valve and a single exhaust valve, though it’s also common to see engines with two intake valves and two exhaust valves. The larger valve is the intake valve, and the smaller valve is the exhaust valve.

The pushrod valvetrain gets its name from the metal pushrods which activate the rocker arms which open up the valves. The camshaft, located in the center of the V, has lobes on it which push the push rods up, opening the appropriate valves. For a full explanation of V8 engines, check out the video!