What is the right way to measure piston ring end gap? is there a certain spec for this? it is for an integra ls 1.8

 

Carefully put the ring into the cylinder and then push it in with a piston until the piston is all the way in. This will make sure the ring is perpendicular to the cylinder wall. Remove the piston and use a feeler gauge to measure the ring gap carefully without moving the ring. When you're dealing with cylinders that may be out of spec (unmachined and not new), check the ring gap at the top and bottom of the ring's travel area. Do not scratch the walls or break a ring.

 

Ring Groove Clearance

Top compression ring.................0.0018 - 0.0028"
service limit.............................0.005"

Second compression ring
Riken Brand.............................0.0016 - 0.0026"
Teikoku Brand..........................0.018 - 0.0028"
service limit.............................0.005"

Ring End Gap

Top compression ring
Riken Brand.............................0.008 - 0.014"
Teikoku Brand..........................0.008 - 0.012"
service limit.............................0.024"

Second compression ring............0.016 - 0.022"
service limit.............................0.028"

Oil control ring
Riken Brand.............................0.008 - 0.020"
Teikoku Brand..........................0.008 - 0.018"
service limit.............................0.028"