Advantage & disadvantage??
Skimming pistons
Advantages
1) Pistons are over designed and are safe to be minorly modded.
2) CR control are according to desired figure wanted.
Disadvantages
1) We different manufacturer has a different factor of safety on their design. But we don;t know what's the figure. So, up to which extend we can mod the pistons.
2) Require to turun engine in order to remove the pistons. More workmanship required.
3) If anything happen to the pistons, it'll most likely to affect the internals.
4) Require engineering shop to do it.
Multiple gasket
Advantages
1) Lower workmanship and does not require engine removal.
2) Low cost
3) Easily available.
4) can be done by mechanic. No machining required.
Disadvantages
1) More prone to oil leak problem.
2) Can;t control the CR precisely as not all specification metal gasket are available. Either too high or too low.
3) Require skillful mechanic to instal double metal gasket nicely.