It takes energy to compress an air/fuel charge, spin the individual piston through its four strokes and overcome the friction inherent in all the moving parts. This is negative energy, or the amount of energy it takes to produce the mechanical work needed in the combustion process. The energy released in combustion is positive energy. The overall efficiency of the engine, then, is the difference between these two, called net energy. READ MORE
A couple times a year new technology comes about that offers to change the way vehicles operate. Whether it’s focused on emissions, fuel economy, performance, lighting or another area, we read about these technologies frequently. READ MORE
BOLOGNA, Italy — Italy's association of auto rebuilders (FIR) has reinvented the engines of old in new, eco-friendly ways that provide tremendous benefit to the auto world. READ MORE
The Top Products
Crate Engine A new line of Edelbrock crate engines are now available for Ford enthusiasts. Edelbrock's RPM 347s deliver up to 449 horsepower and 417 foot-pounds of torque. READ MORE
A/C Leak Finder Katech Performance has announced its "Air Attack" LS7 SC (Supercharged) crate engine is available for owners of hot rods, off-road vehicles and show cars. READ MORE
Crate Engine Package Bolt in 610 ready horses with the new Wegner Motorsports Street Performance 415 LS Small Block Chevrolet Crate Engine packages. They are available as a short block, a long block or two complete turn key engine packages. READ MORE
Survey Time Take a look at the results of our most recent related survey.
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A new line of Edelbrock crate engines are now available for Ford enthusiasts. Edelbrock's RPM 347s deliver up to 449 horsepower and 417 foot-pounds of torque. 
Katech Performance has announced its "Air Attack" LS7 SC (Supercharged) crate engine is available for owners of hot rods, off-road vehicles and show cars.
Bolt in 610 ready horses with the new Wegner Motorsports Street Performance 415 LS Small Block Chevrolet Crate Engine packages. They are available as a short block, a long block or two complete turn key engine packages.