# Air Filter Swap

**URL:** https://sonexpilots.org/t/air-filter-swap/5575
**Category:** Jabiru
**Created:** [April 3, 2026, 7:44pm UTC](https://sonexpilots.org/t/air-filter-swap/5575 "2026-04-03T19:44:25Z")
**Posts on this page:** 1
**Showing post:** 9

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### Author: ![Bryan\_Cotton](https://sonexpilots.org/user_avatar/sonexpilots.org/bryan_cotton/32/760_2.png) [@Bryan\_Cotton](https://sonexpilots.org/u/Bryan_Cotton)
#### Post date: [April 4, 2026, 11:59pm UTC](https://sonexpilots.org/t/air-filter-swap/5575/9 "2026-04-04T23:59:42Z")

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> [@JFYrineo](#):
>
> Carb heat is always off…..

In the Sonex, the air in the cowl under the engine is warm - like really warm in the summer. It’s effectively carb heat. That’s why a bunch of us provide fresh air to the air filter on the aeroinjector. It turns off the effective carb heat of the Sonex design. I think I picked up about 150 static RPM when I went to fresh air induction.

Edit:

> [@Fresh air induction](https://sonexpilots.org/t/fresh-air-induction/5563):
>
> The original thread on the old forum was AeroVee Performance (Cold Air Induction) started by our mad scientist friend Wes. Most of my pictures didn’t make make it from the wayback machine import, so I thought I would re-roll the topic. This is the single best mod I’ve done to my motor. I’m going to do an abbreviated writeup but include lots of pictures. Here is the can I wrapped around my filter. You can see it’s nice and leaky - we don’t want to pressurize the aeroinjector because that imp…

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