Techniques for low budget performance tuning. Back in print and completely updated to cover more recent engines and taking into account new emission control laws, etc. For the do-it-yourself tuner intent on increasing the power output of a car engine, no problem is greater than how to measure, assess and understand the flow of gases through the inlet tract, clylinder head and exhaust. Gas flow, complex, variable and invisible, is the key to an engine’s performance, and professionals use very costly equipment for its investigation. This book describes a practical low-cost alternative that lets you check the gas flow in your engine, devise improvements and test and compare their effect: it needs patience, persistence and some manual skills, but no great financial outlay. 120 pgs., well illustrated with photos and diagrams.