Since cam selection is largely determined by the other two factors, you need to know how to calculate your compression ratio and freeway rpm. We′ll show you how it's done.

Read more about gear and final drive ratios and how to calculate these figures using Excel in Sport Compact Car magazine.

What's the usual mph/rpm ratio? My friends Volkswagen Tiguan 2.0 Auto Diesel does 60mph at 2000 rpm in top gear on a flat road. I think this is about 500rpm too much. There is no change in rpm when ...

High or low? A brief explanation of what gear ratio means for your boat's performance and efficiency. The post Understanding Your Boat’s Gear Ratio appeared first on Boating Mag.

Optional axle ratios can tailor pickup truck power and efficiency to suit your needs as long as the gearing keeps the engine in its torque sweet spot.