[doc] Re: Upgrading the Air Filter

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Interesting read (from the DML)

-------- Original Message --------

Mike,

  I agree with you on this. The only real way to verify claims of power 
increases is thru actual testing. Like David T was saying, these engines were 
developed with all the parts working as a "package" and just changeing/modifing one 
part of this package does not necessarily equal performance gains. When Casey 
first came out with his new air filter housing I liked the design, but 
questioned the actual gains that were claimed. We've done actual dyno testing (Bob 
Brandies has the charts) of the stock Delorean air filter housing and different 
filter combinations available for the car and, believe it or not, the stock 
Delorean air filter housing is designed and works very well with this engine. 
With air flow in to and out of an engine, as long as you are not restricting 
the required amount of air an engine needs, larger is not always better. 
Maintaining or increasing air velocity is a major factor in performance. That's why 
intakes use long runners and headers are made out of specific smaller diameters 
and lengths of tubing, so they can maintain the velocity of the air moving 
thru them. If you make things to big, you kill all the air flow thru it. Thru 
dyno and flow bench testing it was found the stock D air filter housing flows 
air very well, and the design, by becoming smaller at the intake connection, 
actually directs and increases the velocity of the air flowing into the engine 
and the intake system. Matter of fact the engines performance actually drops off 
when the air filter housing was removed completely, which also shows the 
stock filter housing is not restricting the amount of air the engine requires or 
can use. The design of Casey's air housing actually gets bigger at the 
connection point to the intake system, which actually slows the air velocity into the 
engine. I did some flow bench testing of one of these housings and 
unfortunately found no performance gains to be had. I do think it's a very good looking 
air filter housing, but like others were saying, if you're going to get it, get 
it for its style.

  Marty  





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