Piston ring rotation

Jun. 17, 2024

Piston ring rotation

Bruce R. !
This case happened to me, I didn't know why with that engine . first - the engine ran and then reduced the compression I removed the piston and found that the gaps of the ring was aligned. After , the engine ran and reduced the compression again, I removed the piston again and saw the same situation
After a lot of checking, I realized that the reason for the loss of compression is the intake valve does not move smoothly in the valve seat when the engine is hot.
And when the engine was good, I removed the piston and realized that the ring was rotation
- but it is less
And this situation does not repeat itself with later engines
It's like having "ghosts" in that engine
The engine you lose compression: maybe the ring slot is too big and the piston is too small - my engine is still running with one ring
I thought a lot about this case, it happened only twice and disappeared so I didn't learn more, and there's no way to know the exact cause because I'm not an expert and have a machine, measurement, scientific calculations,, ... So I'm content with the answer: there is "ghost" in that engine

This case happened to me, I didn't know why with that engine . first - the engine ran and then reduced the compression I removed the piston and found that the gaps of the ring was aligned. After , the engine ran and reduced the compression again, I removed the piston again and saw the same situationAfter a lot of checking, I realized that the reason for the loss of compression is the intake valve does not move smoothly in the valve seat when the engine is hot.And when the engine was good, I removed the piston and realized that the ring was rotation- but it is lessAnd this situation does not repeat itself with later enginesIt's like having "ghosts" in that engineThe engine you lose compression: maybe the ring slot is too big and the piston is too small - my engine is still running with one ringI thought a lot about this case, it happened only twice and disappeared so I didn't learn more, and there's no way to know the exact cause because I'm not an expert and have a machine, measurement, scientific calculations,, ... So I'm content with the answer: there is "ghost" in that engine

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