Cylinder leakage test

[Kirk Morgan]

Will a gas ported piston and ring package leak the same as a conventional piston and ring package?

[Henrys Toy]

Originally Posted by Kirk Morgan

Will a gas ported piston and ring package leak the same as a conventional piston and ring package?

Good morning Kirk and to all,
Are you using a leak down tester to quantify this ? A cylinder pressure transducer would probably be the best choice to be sure. What dynamics that actually happens during combustion and the resulting pressures will be much different then we can simulate with a compressed air leak down tester.
The leak down testers vary for tester to tester, the various temperatures while the test is being done and other factors will lead to variation.
If you use the same leak down tester the same way, might give you a reasonable answer, but it will still vary.
If someone on here has a better solution for testing this, I hope you will chime in here.

Respectfully,
Henry Kunz 1534 H/SA

[Lenny5160_v2]

While not an answer to the question, when I use a leak-down tester I'm mainly looking for consistent results from all cylinders.

[Ralph A Powell]

You can also listen for intake and exhaust valve leakage. When I tested at TDC then I would let the piston roll over to BDC and with a long beaker bar pull the piston toward TDC and watch tester to see if it is holding pressure.