Should you not see any dust at all inside an intake tube?

[SC Maintenance]

Strange. I've had black air filters on vehicles that never left pavement. Usually about every 30k I throw a new filter on.

Yes, the dirty part is on the dirty side of the filter.

No dust in the intake past the filter.

Surely something passes, but its so fine to be un-noticeable, or stays in suspension and is ingested.

I change my filters approximately every 10K. Used to be only Wix, but I have switched to Denso.

 

[ElectroMechanoMan]

This is some “observations “ on cold air intakes. On my 2016 F150 2.7 L EcoBoost, the air intake is on the left hand side of the engine bay. The snorkel is mounted to the core supports, not near the radiator. The way it’s designed, it provides some ram air and it can’t get any colder than the front of the core supports. On my ‘92 and ‘94 Dodge diesels, the air filters were just about a foot square and pulled in cold air above the right front wheel well. All of the aftermarket cold air intakes pull air from under the hood. Explain to me how that is colder than stock? Also, the K&N air filters are not that great at filtering. I did put a Screaming Eagle filter on my Harley and that did help horsepower. You can’t have a 44 mm carb pulling air through a 3/4” hole in the filter case and expect decent performance. It is a K&N element, but I oil the heck out of it.

 

[The motor guy]

This is some “observations “ on cold air intakes. On my 2016 F150 2.7 L EcoBoost, the air intake is on the left hand side of the engine bay. The snorkel is mounted to the core supports, not near the radiator. The way it’s designed, it provides some ram air and it can’t get any colder than the front of the core supports. On my ‘92 and ‘94 Dodge diesels, the air filters were just about a foot square and pulled in cold air above the right front wheel well. All of the aftermarket cold air intakes pull air from under the hood. Explain to me how that is colder than stock? Also, the K&N air filters are not that great at filtering. I did put a Screaming Eagle filter on my Harley and that did help horsepower. You can’t have a 44 mm carb pulling air through a 3/4” hole in the filter case and expect decent performance. It is a K&N element, but I oil the heck out of it.

You still get cold air once you get moving though.

 

[KrisZ]

You still get cold air once you get moving though.

You don’t because the radiator dumps the hot air into the engine bay.

 

[Pew]

This is some “observations “ on cold air intakes. On my 2016 F150 2.7 L EcoBoost, the air intake is on the left hand side of the engine bay. The snorkel is mounted to the core supports, not near the radiator. The way it’s designed, it provides some ram air and it can’t get any colder than the front of the core supports. On my ‘92 and ‘94 Dodge diesels, the air filters were just about a foot square and pulled in cold air above the right front wheel well. All of the aftermarket cold air intakes pull air from under the hood. Explain to me how that is colder than stock? Also, the K&N air filters are not that great at filtering. I did put a Screaming Eagle filter on my Harley and that did help horsepower. You can’t have a 44 mm carb pulling air through a 3/4” hole in the filter case and expect decent performance. It is a K&N element, but I oil the heck out of it.

Most cold air intakes is a marketing term synonymous with open-air element intakes and not actually routed to a source of cold air with unmodified cars. It usually isnt an issue when the car was moving but when stationary the driver could see the intake temps rise in a diagnostic program.

 

[Delta1]

Most cold air intakes is a marketing term synonymous with open-air element intakes and not actually routed to a source of cold air with unmodified cars. It usually isnt an issue when the car was moving but when stationary the driver could see the intake temps rise in a diagnostic program.

As you can see in my avatar, the CAI on my 06 Saturn Redline had a source of cold air as the actual intake in hidden up in the fender well.
I have since gone back to the stock air intake, since it was such a pain to get to the filter which needed annual inspection at least.
Thankfully the factory system is also CAI, and is also routed into the fender away from the hot engine bay.
I really miss the S/C sounds, but the piece of mind is priceless...

 

[The motor guy]

As you can see in my avatar, the CAI on my 06 Saturn Redline had a source of cold air as the actual intake in hidden up in the fender well.
I have since gone back to the stock air intake, since it was such a pain to get to the filter which needed annual inspection at least.
Thankfully the factory system is also CAI, and is also routed into the fender away from the hot engine bay.
I really miss the S/C sounds, but the piece of mind is priceless...

Usually there is a hole in the body and they suck air in from the wheel well area, so it's technically sucking in ambient air

 

[oil pan 4]

This is where these filters work best
View attachment 206449

I figure they would be fine for a boat on a fresh water body.

 

[The motor guy]

I figure they would be fine for a boat on a fresh water body.

Got one of those cotton K&N style filters on my boat. Wonder if I'm supposed to oil it. Mine is fuel injected. I noticed the carbureted 350 chevy boat engines just have a mesh screen

 

[nascarnation]

K & N has some superb marketing and I assume makes a ton of money on their filters. For the "more power" claim I always tell folks to do some 30-70 mph runs with the production filter and with no filter element at all and see if you can find the difference.

 

[nascarnation]

I figure they would be fine for a boat on a fresh water body.

In a damp climate, the filter is really just to keep big chunks of whatever from sucking into the engine.. My buddy ran a 283 Chevy in a Nova wagon with a Rochester 2bbl for 80,000 miles with no air cleaner housing at all and it didn't seem to have any negative effect. This was in Cleveland Ohio. And back when useful life of cars was typically 100,000 miles.