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RWD (10.04.2011, 01:53)

A front engine, rear wheel drive (RWD) vehicle has the engine in front and the drive axle in the rear. The transmission is usually right behind the engine, and a drive shaft transfers power back to the rear axle.

(Auto body repair technology, James E. Duffy,Robert Scharff, p. 25)

FWD (10.04.2011, 02:05)

A front engine, front wheel drive (FWD) vehicle has both the engine and transaxle in the front. Drive axles extend out from the transaxle to power the front drive wheels. This is one of the most common configurations. The heavy drivetrain adds weight to the front drive wheels for good traction on slippery pavement.

(Auto body repair technology, James E. Duffy,Robert Scharff, p. 25)

4WD (10.04.2011, 02:20)

Four wheel drive systems use a transfer case to send power to two differentials and all wheels. The transfer case can be engaged and disengaged to select two or four wheel drive as desired. It is common on off road vehicles.

(I-Car Professional Automotive Collision Repair, James E. Duffy, p. 53)

Stirling Engine (10.04.2011, 02:45)

The stirling engine operates by external combustion. The air in the hermetically sealed engine cylinder is heated by means of a heat exchanger known as a regenerator, as opposed to fuel being burned in the cylinder. The original Stirling engine was designed by the Revd Stirling in 1845. Stirling hot air engines were used in some industrial applications and domestic appliances, but have dropped out of use because steam engines have proven to be more effective. In the twentieth century, several manufacturers worked on the development of Stirling engines for use in motor vehicles because they should ideally produce fewer harmful emissions and have a higher thermal efficiency compared with conventional engines.

(Automotive Science and Mathematics, Allan Bonnick, p. 178)