Looking at putting a CAI on my 2006 5.4L V8 F150
Member
Joined: Aug 2009
Posts: 52
Likes: 1
From: NW Indiana
Thanks for then link! The bench flow measurements basically confirm what I've been saying, you won't get any more air flow by removing the snorkel, just reduced velocity.This is due to the engine only pulling a maximum of 473 CFM, and the OEM intake flowing 621 CFM. Bottom line, you could use a 8" pipe for an intake, and you wouldn't get any more air than the OEM setup.
I also agree with Jim on his comments on K&N air filters!
I also agree with Jim on his comments on K&N air filters!
Senior Member
Joined: Dec 2011
Posts: 443
Likes: 0
From: Durham, NC
What you failed to point out is the ability of the Gotts and silencer removed to flow more at 656.83 CFM. Yes we can't shove more air in to a NA motor, but gains are made by reducing restriction. The small inlet is good for all the effects you talk about at lower CFM draw, but when the draw increases this point becomes a restriction. This is why with air filters to see "how dirty" they are we measure it with vacuum restriction gauges. Aftermarket intakes can flow stupid amounts of air (usually with less filtration but that's another topic), so by having the ability to flow more there is less restriction at the top end of the motor's needs. It's been proven on the dyno time and again that the mod can produce gains, so focusing on one principle in a system that combines several factors and principles is near sighted.
With the CAFE standards today, ALL vehicle manufacturers design their intakes to be as efficient as possible.
Last edited by Takeda; Feb 22, 2012 at 12:47 PM.
Member
Joined: Aug 2009
Posts: 52
Likes: 1
From: NW Indiana
I'll say it one more time! You can use a 8" pipe for an intake, which will flow 4K CFM, and the engine will still only pull 473 CFM. So, you won't get any more air removing the snorkel!
With the CAFE standards today, ALL vehicle manufacturers design their intakes to be as efficient as possible.
With the CAFE standards today, ALL vehicle manufacturers design their intakes to be as efficient as possible.
at the efficient as possible. Yes they pay a great deal of attention to CAFE, but they also have to worry about acoustics for the consumer. Just like on the exhaust side, there's gains to be had from the stock configuration. The stock system is efficient, but if the stock setup was as efficient as possible there would be no forums talking about modifications that actually gain power. 
