What are the drawbacks of free piston engines and how can they be improved?

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SUMMARY

The discussion highlights three primary drawbacks of free piston engines: oil consumption, noise production, and efficiency issues. Free piston engines tend to burn oil, raising the need for oil reuse strategies akin to those in four-stroke engines. Additionally, the short explosions produced by these engines create significant noise challenges, complicating muffling efforts. Lastly, two-stroke free piston engines are less efficient than their four-stroke counterparts due to incomplete fuel combustion resulting from their shorter cycles.

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Stanley514
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There are following problems associated with free piston engines (generators).
Do you know if there exist some ways to overcome it?
1)Free piston engine burns oil.What could be done to reuse oil similar to four-stroke engine?
2)Free piston engine produces very short explosions which are claimed very difficult to muffle.
How noisy it really is?As I know ``muffler`` works good even with pistol though pistol produces even shorter explosions.
3)Two stroke free piston engines are claimed to be less efficient than four stroke engines
because they are two stroke.Due to short cycle fuel burns incompletely etc.
Is it really so?And how much do they loose in efficiency?
 
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