Focus Fanatics - View Single Post - Another Dual Exhaust Post...
View Single Post
Old 07-14-2012, 09:59 AM   #42
Brabs_Weather
Focus Enthusiast
 
Join Date: Jan 2012
Fan#: 93741
Location: Chesapeake, VA
What I Drive: 04 Ex Ltd, 08 Edge Ltd, 12 FF Ti

Posts: 387
FF Reputation: 2 Brabs_Weather Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by dyn085 View Post
Bernoulli's Priciple will give you some insight. An engine is just an oversized air pump...it's not that there's more air flow, just that the velocity changes. Temperature, pressure, and velocity go hand in hand. Your header was smaller piping and was high temp, so velocity was high. In the 2.5", it had more room and time to cool, so velocity slowed. You can only flow out the same amount that flows in.

There's so much more to it, but thats a quick overview.
This decrease in velocity will slow the gasses from exiting the exhaust , which should cause pressure to increase slightly.
__________________
White Platinum Tricoat Metallic
2012 Ford Focus Titanium
Handling Package Nitto Motivo's
Borla Exhaust with UltraQuiet resonator
K&N X-4870. Steeda RSB
Brabs_Weather is offline  
    Reply With Quote