?'s about tuning, pinging, and Compression

You would hear the knocking when you put a load on the engine. It could range from a little rattling sound to what might even sound like a rod knock. Your cam also plays a big role in how your engine will react to the higher compression. The actual running compression depends on your cam spec/design. A Ferrarri 360 Modena has 11:1 compression, makes 400hp, will rev to 8500 rpm without even try hard, and does it all on 92 octane pump gas. The valve and ignition timing plays a major role in getting it done.