We know we have to replace our engine air filter because if it gets too clogged, it will restrict air flow and reduce performance/economy. But surely, even a clean air filter obstructs air flow somewhat, so might we get better performance and economy if we removed it altogether? Would that upside be significant, and would the downsides be serious? Wesley
Air filters do restrict the intake of air, but over a large surface area so they allow more than enough to get through to maintain the essential 15:1 ratio with the fuel supply regulated by the throttle (accelerator). Although your filter fits in a modest container, if fully spread out, the fibre mesh would be the size of a bed blanket.
