(ROBIN FLY) wrote in message ...
Few weeks ago, 2 Lancair 320/360s stopped at my airport. I went over to get a
better look and found their engine air intake does not have any air filter.

Are they designed this way?

Would bugs be a problem?

Does it shorten the TBO?

I built a Lancair 320 back in '91. It was the 16th "fast-build" kit
shipped from the factory. As I recall, the builder's manual for these
early models had few details regarding engine installation. They had
a diagram of a simple airbox that could be constructed out of
fiberglass (which suggested incorporating a foam air filter), but no
other specifics. I ended up making one from sheet aluminum with a
ram-air inlet (unfiltered).

I think there is now a factory built airbox for the plane, but early
examples will vary (it's a homebuilt after all).

Yes, the lack of a filter will probably shorten the TBO, but plenty of
people go without 'em.

Craig.