OTR18WHEELER

Time for a change
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dual 300 watt halogen work lights behind the filters.
new filter from Roger

Imo000

Does it feel heavier?

joejoe

I just sold a k/n filter to someone, his air filter (for the last year at least) was missing the filter part from the 'P' to middle 'O'. His car is an '83 5 speed that has AFM, (better than nothing)

Fogey1

So which way is the damn thing supposed to go?

https://rennlist.com/forums/9869128-post24.html

https://rennlist.com/forums/7994314-post149.html

will

Bilal928S4

If it's a later car, convex side up.

depami

Why does that matter?

Bilal928S4

My understanding is that the very early cars have the filter upside down (w the convex pointing down). Don't know the exact date/year of the change. Hopefully somebody with more knowledge will chime in.

OTR18WHEELER

the old filter has TOP printed on the element on the convex side
the new filter has arrows one end depicting direction of air flow,
which is also convex side up. The idea being the filter will catch more air entering from either side of the tubes, I think.
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mike77

I'll bet I put mine in upside down thinking those arrows meant up.

Bilal928S4

Like seen on one of the links, the filter comes with arrows pointing either way. So don't worry about the arrows.

Imo000

I think the covex is to smooth out the airow.

Mrmerlin

the reason for the hump points to the sky is twofold .

with the filter base further away from the intake port it will increase the size of the filtered air area , also with dirt entering the inlet air the ramps will trap more of the heavy particulates further from the center thus increasing the chances that the filter will stay cleaner in the center.

DONT follow the arrows as they can be marked either way as has been pointed out, just remember, Hump to the sky