Ask questions via twitter! Message any question to @answers on twitter. We'll publish the question and send you a reply each time there's a new answer.
Next Question

Answered Question

crooner12 crooner12
 

Mahalo is adding a tip to all questions that don't offer a tip.
M$1.00  Funded By Mahalo ? |  March 27, 2009 12:22 AM

What is the purpose of the large exhaust tip and gap on the Chevy/GMC Duramax diesel trucks?

I'm sure many people have seen them. The unusually shaped, and unusually long exhaust tip with a small gap where the main exhaust pipe shoots exhaust into this larger collector out the back.

I understand that it's to cool exhaust gases, but to be honest, I don't think this short piece is going to make a huge difference. If they wanted to cool the exhaust gases, why not do it further upstream in the exhaust system? Also, all of the exhaust is still going to go into the air, regardless if it's at 800 degrees or 300 degrees. Ford diesels do this too. Perhaps there's a more technical explanation as to why this is necessary.
Interesting Question?  Yes (0)   No (0)   
RSS
 
 

Best Answer  Decided by Votes

ensorceled ensorceled
 
 April 08, 2009 03:41 PM
In all exhaust systems you are trying to minimize back-pressure and maximize exhaust flow while meeting regulatory noise limits.

The large tip allows exhaust gases to expand rapidly and dissipate rapidly while still acting as sound baffle. This dramatically reduces back-pressure while still muffling a lot of the noise.

This is identical behavior to the silencer on a gun.
Source(s):
Grade 11 Auto-Shop



Helpful Answer?  (0)   (0)    Tip ensorceled for this answer
Permalink | Report
Voted as best: bbrookin, jeffhoard
   Reply  
 
 

Answer this Question

How tips and payments work

This question has already been resolved. You may add an answer to it but you will not be eligible to win best answer or any associated tips.

Related Questions

View All Cars & Transportation Questions

Ask a Question


140 characters left
Top of Page
Buy Mahalo Dollars with Credit Card or PayPal

Top Members

This Week All Time
  • buddawiggi
    buddawiggi
    2nd Degree Black Belt
    27115 Points
    M$783.09 Earned
  • kty2777
    kty2777
    Purple Belt with a Brown Tip
    5444 Points
    M$199.92 Earned
  • opher
    opher
    Purple Belt
    4166 Points
    M$187.17 Earned
   See All
 

Most Popular Tags

mahalo(1599)
twitter(945)
iphone(462)
music(459)
google(355)
food(320)
internet(304)
online(294)
beer(279)
money(262)
movies(255)
facebook(254)
apple(251)
aotd(235)
answers(222)
health(217)
video(207)
dog(205)
free(203)
windows(195)
   See All
 

Categories

Welcome New Members


 
 
Mahalo Dollars are the currency of Mahalo Answers.

Each Mahalo Dollar costs $1.

Once you earn more than 40 Mahalo Dollars, you can request to be paid via PayPal. Each Mahalo Dollar is currently worth $0.75 when paid out via PayPal. Learn More

 
 

Please log in to use this function.

Answers Home | Ask a Question | Earn Points | How Tips Work | Widget