Posts Tagged ‘compression ratios’

The Importance of Compression Ratios and how to Measure Them

Friday, March 11th, 2011

Since race pistons in domestic V-8 engines move up and down in excess of 100 times per second, replacing them is a normal part of the racer’s routine. NHRA Top Fuel and Funny Car teams replace them after every race pass and every second qualifying pass. Pro Stock teams replace them after every 40 passes approximately, and weekend warriors replace them every 12 to 18 months, sooner if their engines are nitrous-assisted. At piston replacement time questions of spec changes usually arise—especially the topic of compression ratios. (more…)