Ok now with all correct info, looking for opinions
05-31-2009, 04:55 PM
#62
1st Gear Member
Thread Starter
Join Date: Mar 2009
Location: South Eastern U.S.
Posts: 87
I'll say this again but nobody will read it because it's me and the post is not going to be a novel. I just bought a set of GT40P's for $175 and I plan on porting, doing some bowl work, and running larger unshrouded valves. I am stepping to a custom cam and a stall that is around 2000 to 2400rpm.
05-31-2009, 05:26 PM
#63
5th Gear Member
Join Date: Nov 2008
Location: SC
Posts: 2,401
I'll say this again but nobody will read it because it's me and the post is not going to be a novel. I just bought a set of GT40P's for $175 and I plan on porting, doing some bowl work, and running larger unshrouded valves. I am stepping to a custom cam and a stall that is around 2000 to 2400rpm.
05-31-2009, 07:56 PM
#64
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
You should know that sometimes results vary from engine to engine car to car. The results you get in your area can differ in mine, you should know that. I'm all for eliminating restriction in the exhaust but the entire car and exhast system has to work as a whole. If the exhaust gases can make a smooth transition out of the exhaust it works to the best power of the car. If the exhaust is to large the air curls up and the next pulse wave has to hit a wall of air and it creates a domino effect and instead of the exhaust being pushed down the pipe the flow slows down becuase of turbulance in the exhaust. There is a point where exhaust gets to small and a point where it gets to large.
..... and I am the 
"hack regarding airflow dynamics"?........ 
That is incorrect and where the misinformation lies.
1. Exhaust gases do not change state to solids becoming unmovable matter.
2. A 3" ID has 44% more cross section area than a 2.5" ID exhaust, even if all of the 44% increase over the 2.5" exhaust in the cross section gets turbulent or "plugged" as you describe it, wouldn't it be the same as having a working 2.5" pipe?
3. Is 1 CFM trough a 4.9 Sq." area pipe (2.5" ID) = 1 CFM through a 7.1 Sq." area pipe (3" ID)?..... guess which one will look slower? .....but the flow is still 1 CFM for both.
4. So that domino effect decay due to turbulence at the silencer, causes it to get theoretically plugged, and those harmonics will reach the exhaust port?
5. Do you know the easiest way there is to check for that BS conclusion? .... measure exhaust system back pressure with a gauge, or get a little technical and use a transducer with a datalog device. If back pressure does not increase in the system through its working RPM's and engine load conditions.... guess what that means regarding the air walls creation due to turbulence?
Have I done it?...... Guess.
05-31-2009, 08:12 PM
#65
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
I'll say this again but nobody will read it because it's me and the post is not going to be a novel. I just bought a set of GT40P's for $175 and I plan on porting, doing some bowl work, and running larger unshrouded valves. I am stepping to a custom cam and a stall that is around 2000 to 2400rpm.
They'll work great on a 302, but not on a 331/347..... or better worded, there are better options to ensure engine "breathability" at a similar cost.
05-31-2009, 08:14 PM
#66
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
from this point forward any off topic comments of yours will be deleted and PA is next, no more warnings
Last edited by mjr46; 05-31-2009 at 08:19 PM.
05-31-2009, 09:22 PM
#67
6th Gear Member
Join Date: Feb 2005
Location: KY
Posts: 13,396
Portmaster this is one and only warning. it is a debate resorting to name calling will get you no where but a trip to banned camp. when a question is presented to you answer the first time asked so people do not have to continue asking. answering by saying someone is swinging from someones nuts is the correct answer FYI.
this thread is done if you have any questions PM me and i will take care of it.
this thread is done if you have any questions PM me and i will take care of it.
06-01-2009, 09:38 AM
#68
MF Administrator
Join Date: May 2005
Location: South Carolina
Posts: 8,191
Since you don't care, neither do I - BANNED
06-01-2009, 11:47 AM
#69
6th Gear Member
Join Date: Feb 2005
Location: KY
Posts: 13,396
oh and portmaster i look forward to joining another forum where you can argue with people who supposedly doesnt know anything . its called
S B F T E C H dot com. cya around LOL
S B F T E C H dot com. cya around LOL
Thread
Thread Starter
Forum
Replies
Last Post
folivier
Tennessee Regional Chapter
4
10-02-2015 05:32 AM
junior04
4.6L (1996-2004 Modular) Mustang
1
09-28-2015 10:53 AM
