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Spark plug analysis

by Denis Ranque in 912 / 914 Technical Questions 7 years ago

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Re: Spark plug analysis

by James Ott » 7 years ago

James Ott

22 322 358

As a general rule, the only real reason to ever change a filter is when it is loaded with contaminant to the point it is in danger of bypassing. As a filter is used and the contaminant gradually fills the pores in the element, the filter gets MORE efficient, never Less efficient. A properly designed filter will not push contaminant that is larger than the pore size thru the pores even though the pressure drop reaches the bypass valve setting. Since the Rotax recommendation of 25 hours when using 100LL is strictly because of lead contamination, mostly in the gearbox, it has nothing to do with the filter because the filter pore size freely lets the fine suspended lead pass right thru. Therefore, I personally believe there is no harm in filter changes at 50 hours.

Thank you said by: Genival Pacheco

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Re: Spark plug analysis

by Genival Pacheco » 7 years ago

Genival Pacheco

4 87 135

Tanks for the detailed explanation.

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Re: Spark plug analysis

by David HEAL » 7 years ago

David HEAL

23 186 417

One also changes oil filters on a regular basis to check for contaminants (e.g., metals, silica, etc.) -- cut open the filter to inspect media.

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