airfilters

[Heo]

https://www.youtube.com/watch?v=EkpsydS8JXI

[Autoholic]

Not exactly surprised. GM Truck Central has an article on some testing they did, made me realize that a K&N filter is not the best idea. You're better off using a high quality paper filter and save your money. The K&N was one of the worst performing air "filters" in the competition. If it was a marine application, I could see an oil based filter being chosen over a paper based filter due to the amount of water that filter is going to be dealing with. The evidence in the engine masters comparison shows that you don't really sacrifice power with a paper based air filter, it has a lot more to do with the direction the air has to travel to enter the engine. From an engineer's perspective, it makes complete sense if you think of flow into a hole, the design on the inlet can have a huge impact on the head loss of that port.

http://www.gmtruckcentral.com/articles/air-filter-study.html

[machoneman]

Well, one small surprise is the flat plate versus the dropped base. Long ago, the hot setup was, for any make of car, to buy the L-88 Chevy Corvette dropped base, add a paper filter and make or steal a top to fit the filter (14" IIRC). Too bad that most if not all of the 'best' would never fit under my 70's hood nor many other old muscle cars.

On Edit: we knew btw back then that a flat plate stuff was better (the filter top was decades away) but this would never fit under a stock no scoop hood. 

Loved the salad bowl! Btw, many dragster/altered owners used to use other kitchen ware. Taking a stiff, professional-grade aluminum baking pan and cutting a "Holley hole" in it made a great, cheap start to adding a snorkel scoop on top of it. BTDT! 

I'm going to now pop for the 14" K&N filter lid, dump my Ford-sized 13" assembly, and make up a less-dropped-base (can't be 100% flat or it won't fit) for my Mustang.   

[Falcon67]

Lot of us running around in the 70s with a big paper filter and the lid flipped - didn't know we really did have a hot setup LOL.  The tall velocity stack with filter is what I run on the dragster.  Except rather than pay $$$ for K&N, it's a tall Summit base with two Summit filters glued together.  Cheap azz MF...

[machoneman]

Lot of us running around in the 70s with a big paper filter and the lid flipped - didn't know we really did have a hot setup LOL.  The tall velocity stack with filter is what I run on the dragster.  Except rather than pay $$$ for K&N, it's a tall Summit base with two Summit filters glued together.  Cheap azz MF...

Hah! Cheap azz and smart!

Yeah, the flipped lid thing a lot of us did back then but damn, those big, heavy and black painted OEM filters got tossed for better looking aftermarket filters!

Say Chris (or anyone here) I had another thought. Say I purchase a 14" K-N unit with their minimum dropped base (7/8"ths or so) add a short 2" tall filter and plop on the top filter cover. The idea being minimizing the horizontal air flow by the small (short) filter and maximize the top-down airflow.

Whatdathink fellas?   

[Falcon67]

Innerwebs scuttlebutt says that the filter top lids like to mess with fuel metering.  in the Mustang and when I ran a scoop on the Falcon, I used a 14x3 (14x4 if space allowed) filter, no drop base, solid lid.

[machoneman]

Innerwebs scuttlebutt says that the filter top lids like to mess with fuel metering.  in the Mustang and when I ran a scoop on the Falcon, I used a 14x3 (14x4 if space allowed) filter, no drop base, solid lid.

Ah! I've heard/read the same (fuel metering) but it didn't affect the 750 hp engine in the vid now did it?

I wonder if the addition of a closed hood, tight compartment, radiator heat and fan 'wind' make the filter top a bad choice?

[Falcon67]

I imagine it's like a spacer - you just have to try it in any particular situation and see how it performs. 

[chris401]

Thanks for posting the video. I experimented several aircleaners and carburetors for my 65 3/4. For best over all fuel miliage and towing, this is the set up I had on my 352. 1974 Dodge motor home air cleaner, air conditioning ducts from the motor home, 68 Quadrajet, two spacers and both stacks under the air cleaner. The interstate miliage stayed about the same with the 9" chrome raised base air cleaner but over all suffered around town where there was not much cool airflow.

[fryedaddy]

i guess i just lucked out on my setup,paper filter and a filter top.i guess i will leave it alone.the video said that was one of the top performers for a stock hood.good video!