Homemade hi-flow air filter ideas???

My ex-GF's cat had a PP box. It doubled as a PooPoo box also.

 

First off the old oil bath air cleaners had a minimum 10 inches restriction and it went up to about 16 when the inlet tube had a coating on it and the coating did not have to be very thick.
The under hood air filter, gets a boost effect same as a Nascar using the cold air box effect. The air in front of the windshield is pressurised. When the filter is under the hood, the length of piping is a lot shorter. Stem co use to have a chart that said every 90 degree bend is the same as 20 ft of straight pipe
All this talk of using a KNN filter is BS they let in a lot of dirt, there is a survey available that rates air filters, KNN was the very worst it held less dirt, and let threw the most dirt.
Excess air does not make power, it takes friction HP to compress air that is not needed for complete combustion. The engine is designed to use the least amount of air to get most amount of power, with the least amount of fuel.
Adding twin air filters hanging on the outside of the hood, That is really stupid, when you are driving hold your hand out the window, and imagine the power it takes to drag those filters down the road. Put a restriction gauge on the intake at the filters and measure it at highway speed and full power, under hood wins.
Aerodynamics works, putting the air filters and the exhaust on the outside of the cab may look good, but you will look good and go broke.
Trucking is suppose to be how you make money.

 

Air filters and exaust on the outside will make you go broke? I have never owned a truck that was not setup this way. I must know something you don't?

 

Seen a box filter that reminded me of the home A/C filter. Looked up some pics for ya. Looks like that brand was popular on Diamond Reos. Not sure who the supplier was. Donaldson? Nelson?

Check out the pancake muffler to match the fuel tank too.

Thanks to Hank's truck pictures.

 

Trust me being in the NASCAR capital of the world and been to few races myself, those guys would ditch that cowling intake in heart beat for a ram air effect from the front end. The cold air box cowling intake is really a restriction that the rules has made everybody use for years. Notice the top fuel, funny car drag racers use ram air along with Indy Car and Formula one use ram air that if a cowling induction was superior they would be doing it doing to their rules are more liberal in car design.

 

Any time someone came in telling me that the air cleaners on the hood were better, and the mufflers running up the side of the cab also. I would just ask them to put there hand out the window at top speed flat, see how much area the air filter and exhaust covered and the power it took to run them threw the air.
If you want you truck to look a certain way that is great, but money is saved a nickle at a time. It does not matter how much you give the the little girl at the bank it only matters what is left after a year.
If you come to a shop and have a washable filter and they run a rag in the intake and it has an dirt on it, warrenty is rejected, do an oil sample and it shows dirt on a warrenty claim it will be denied.
I did engines for a lot of years never saw a quality dry properly installed filter fail, I saw lots of canisters on the fenders fail, try it some time when the filter is out, put solvent on the areas were the mounting hardware is 50% will fail. Many people will just take out the old filter, and stuff in a new in never cleaning the canister the result is a leak. The ones under the hood people take them out to look then instead of cleaning the housing just push it back in, resulting in a leak.
I have dyno"d many trucks with air cleaners and without, with exhaust and without, when testing at 400HP to the ground never saw a difference, any increase in HP the truck speeds up, It sounds real good and makes people feel good after they spent a lot of money on BS modifications, If it made any difference it would show up on the dyno, never did.