Engine Performance problem
1980 International Scout 6 cyl Four Wheel Drive Manual 200000 miles
What I'd like to know is: Why do air filters have air horns?
What bother's me is this: The intake diameter of the horn is far smaller than cylinder size. And yes, it is a stock air filter housing.
I would have figured that the volumetric efficiency of the engine would be far improved without that air restriction.
On high performance engines, the air filter is completely free of external obstructions such as to allow max air intake.
So, why the air horn on stock automobiles? What's the deal there?
By the way, the engine is a Nissan Diesel SD33T.
The 'T' stands for 'turbocharged.'
Additionally, and just an additional thought, it would seem to me that with the air restriction the turbo would have to work just that much harder to move air.
I thank you in advance for your time!
have the same problem?
Saturday, April 25th, 2009 AT 4:41 AM