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Install a Foam Air Filter?

机译:安装泡沫空气滤清器?

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I recently installed a Brackett air filter in my 1971 Cessna 150L, replacing the old paper filter type, but now wonder if I was correct to do so. I have heard reports of sand ingestion caused by increased vacuum in the carb heat box. I understand that foam rubber increases the resistance to air flow, thereby sucking more air around the butterfly (flapper) valve, which by its nature is not capable of providing a perfectly airtight seal. The foam air filter filters better than the paper, but what about increased dirt sneaking in through "the back door?" Am I worrying too much?
机译:我最近在1971年的Cessna 150L中安装了Brackett空气过滤器,以取代旧的纸过滤器,但现在想知道这样做是否正确。我听说有报道说碳水化合物加热箱中的真空度增加会导致沙粒摄入。我了解到,泡沫橡胶会增加对气流的阻力,从而在蝶形(挡板)阀周围吸入更多的空气,而这从本质上讲不能提供理想的气密密封。泡沫空气过滤器比纸过滤器更好,但是通过“后门”偷偷溜走的污物又如何呢?我担心太多了吗?

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