Why and How you need to measure the piston-to-wall clearance in every engine.
By Robert Poole
Piston going into bore?
Why Do You Need To Measure Piston-to-Wall Clearance?
Everything we do to an engine to increase power, whether that is installing free-breathing cylinder heads, a higher lift camshaft, or something as dramatic as a supercharger or nitrous oxide system, is done for the sole purpose of increasing cylinder pressure. More cylinder pressure means more force exerted on the top of the piston during combustion, forcing it down in the cylinder bore harder—more force equals more power transmitted to the crankshaft, hence more horsepower at the flywheel.
The poor piston, therefore, is on the front lines of the violence that occurs in the combustion chamber in t