This book about Manual Air-Cooled Aircraft Engine Cylinders. If you want to read the review containt below : The hairpin valve springs pictured to the left were possibly pioneered by Salmson in 1911, and later used not only on British single-cylinder racing motorcycle engines, but also by Ferrari and others into the 1950s. This use was a response to the same problem that led to desmodromic valves at Ducati, Norton (test only) and Mercedes - namely the fatigue of coil springs from “ringing”. Hairpin springs ran cool because they were exposed, and they were less subject to fatigue....

2011 BMW Z4 was designed to obtain maximum performance. With 3 new models, the BMW Z4 3.0-liter engine inline 6-cylinder. To SDrive30i has 255 horsepower with a 6-speed manual transmission. While sDrive35i is turbocharged and has 300 horsepower with a 6-speed automatic transmission as optional. sDrive35is is the latest model which features 335 horsepower with 7-speed dual-clutch automated-manual transmission that behaves like automatic. These features may also be an optional from sDrive35i model. Security features are included such as ABS, antiskid system, traction control and side airbags....