Time was when a valve job was done with some valve-grinding compound and a vacuum cup on a stick. But no more. Today's high performance engines require the same machining precision in the valves that ...

While the engineering community continues to explore the benefits of electric and hybrid vehicles—i.e., the environmental and renewable energy factors—the automotive market is still dependent on ...

Prototype IVA engine swaps a usual longitudinal camshaft for short, individually driven camshafts sited across the top of the cylinder head. IVA cam drive is by ECU-controlled electro-mechanical ...

The hunt for efficient engine valve technology can be a never-ending journey into cam timing, various combustion cycles, and lift and duration adjustments. For that reason, some companies believe ...

Jacobs Vehicle Systems, a manufacturer of heavy-duty diesel engine retarding systems and valve actuation mechanisms, has launched a new 2-Step Variable Valve Actuation (VVA) system. By enhancing ...

The engines of yesteryear were pretty simple, with tappets clackity-clacking away on cam lobes, opening valves, and making a ruckus while doing it. Mechanical lifters were adequate for valve operation ...

The language of import performance can be strange. Sometimes it's a verbal stew of numbers and letters--RX-8, NSX, and MR2, for example--that seem randomly tossed together. At other times it adopts ...

Modern engine bays are filled with black plastic where bright cast aluminum once sat, and few parts symbolize that shift more ...

No matter how tightly within the prescribed specifications an engine's piston clearance and ring tension are in its cylinders, a certain amount of fuel and combustion vapor slips past and enters the ...

Truck owners choose the 5.9 Cummins engine because it combines outstanding power features with exceptional durability. Maintenance for such an engine should follow standard procedures to guarantee ...

PACCAR has patented a method for starting a vehicle’s engine that involves rotating the crankshaft while keeping the exhaust valves of the combustion chambers open before fuel injection. The engine ...