nocones
nocones PowerDork
10/25/23 10:36 p.m.

The classic round element on single bolt air filter housing?

Chevy had them on TBI engines until 1996 on the 454.  I imagine some heavy truck applications may of kept the TBI after OBD2 came along.  

Please unlock your knowledge and place it in us.

David S. Wallens
David S. Wallens Editorial Director
10/25/23 10:37 p.m.

Yet it’s still used for the check engine light. 

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
10/26/23 6:22 a.m.

Dodge probably used it on Magnum engines for a bit longer than 1996.

 

Vans used one until 2003.

Datsun240ZGuy
Datsun240ZGuy MegaDork
10/26/23 7:43 a.m.

There's a tic toc that ran through some of these

last CAR sold w/chrome bumper - 1991 Ford crown Vic.  Suprised. 

914Driver
914Driver MegaDork
10/26/23 7:54 a.m.

1992 Chevy Wagon yacht.

bobzilla
bobzilla MegaDork
10/26/23 8:38 a.m.

In reply to 914Driver :

Actually the 91-93 had a square filter box. Still TBI thjough.

capsule review 1991 caprice classic estate

jharry3
jharry3 Dork
10/26/23 8:42 a.m.

And the cool guys used to flip those covers over for less intake restriction and more induction noise @ WOT.

dean1484
dean1484 MegaDork
10/26/23 8:46 a.m.
jharry3 said:

And the cool guys used to flip those covers over for less intake restriction and more induction noise @ WOT.

If sound was HP it added at least 50 HP to my cars. :-).  

David S. Wallens
David S. Wallens Editorial Director
10/26/23 9:29 a.m.

Wasn’t cool enough to do that when driving my parents’ ’78 Malibu but, looking back, should have. Dad would have approved. 

Toyman!
Toyman! MegaDork
10/26/23 10:29 a.m.
dean1484 said:
jharry3 said:

And the cool guys used to flip those covers over for less intake restriction and more induction noise @ WOT.

If sound was HP it added at least 50 HP to my cars. :-).  

At a minimum.

The sound of a Quadrajet opening the sewer pipe secondaries with the breather top flipped should be experienced by all car guys. 

 

11GTCS
11GTCS SuperDork
10/26/23 11:42 a.m.

In reply to Toyman! :

LOL, the 350 in my boat has a 4 barrel and only a spark arrestor.  It makes great induction noises when the secondaries open.

We used to flip the air cleaner cover on all the old E36 M3boxes we drove in high school, absolutely +10 HP. devil

NickD
NickD MegaDork
10/26/23 1:17 p.m.
dean1484 said:
jharry3 said:

And the cool guys used to flip those covers over for less intake restriction and more induction noise @ WOT.

If sound was HP it added at least 50 HP to my cars. :-).  

Engine Masters actually tested the flipped air cleaner lid, and it was indeed worth actual measurable horsepower.

My father talks about how his best friend had a '75 Trans Am 400/4-speed, and that was when Pontiac was blanking off the back of the Shaker hood. They were out in the garage one night, got looking at it, ended up drilling some holes in the back and then using a hacksaw and file to remove the plug out of the back to get the cool Quadrajet noises.

David S. Wallens
David S. Wallens Editorial Director
10/26/23 1:33 p.m.

In reply to NickD :

I believe Hot Rod once ran a template for drilling out the back of that scoop. 

Asphalt_Gundam
Asphalt_Gundam HalfDork
10/26/23 1:48 p.m.
jharry3 said:

And the cool guys used to flip those covers over for less intake restriction and more induction noise @ WOT.

Dyno proven 5hp/7ftlbs on a 93 Chevy 1500 5.7TBI. 

Similar results on a 350SS truck the same day.

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