Push and allow the "legs" to splay left and right across the piston dome INLINE WITH THE WRIST PIN AXIS. Insert your two "legs" of solder into the plug hole while holding the solder by its' "U". Now back the motor up opposite normal direction of rotation until the piston has dropped about an inch back down the bore. Bring the engine up to approximate top dead center (follow the piston up the bore with another piece of solder stuck into the plug hole.). You should now have an inverted "U" of solder with "legs" crossed in an "X" pattern. This is also VERY IMPORTANT to get accurate indications from the very edge of the combustion chamber limits! Bend the solder into an upside down "U" shape with the "legs" about 1/2" apart and parallel to eachother. THIS IS A BIG DEAL, SO TREAT IT WITH PROPERLY DUE ATTENTION!Ĭut the solder tips squarely with a single edge razor blade so each tip is cut perfectly perpendicular to the solder length. 065") YOUR MEASURED CLEARANCE WILL BE INACCURATE!!! If you get inaccurate squish clearance impressions, everything that is deduced from them will be seriously flawed. 055" squish clearance, when the proper solder thickness to be used would be. ![]() 090" thickness solder in a cylinder with. IMPORTANT! IF YOU USE SOLDER THAT IS THICKER THAN NECESSARY TO MEASURE THE EXISTING CLEARANCE (Example: Using. 038") and if it is not thick enough because your squish clearance turns out to be greater, just go up to the next size. 065" (in tightly set-up race engines of smaller displacement you may need only the. Common available diameters are approximately. Thicker than your current squish clearance. You will need about a 10" length of solder of a diameter that is ![]() To determine your actual squish clearance. ![]() Measuring it accurately so as to make decisions about what modification(s) should be made to an engine's compression ratio and combustion chamber is a critical reference step in planning a high performance motor. The "squish" band is a somewhat narrow angle cut into the outer periphery of the combustion chamber that comes into a close clearance proximity with the piston crown outer edges at TDC (Top Dead Center) of crankshaft rotation. How to Measure Your Cylinder Head Squish Clearance.
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