How/why ported throttle body works?
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,437
Likes: 5
How/why ported throttle body works?
Guys,
In looking at a ported vs non orted TB...I don't see much difference. The OEM has an opening on the inside leading to an outlet which connects to the valve cover. The ported one, is similar just contoured to the shape of the inner part of the TB with a hole leading to the back exit like above.
So how does this improve anything. Is it that it limits the exiting air to the vac line and makes more flow through the baffle to the intake manifold?
Thanks,
al
In looking at a ported vs non orted TB...I don't see much difference. The OEM has an opening on the inside leading to an outlet which connects to the valve cover. The ported one, is similar just contoured to the shape of the inner part of the TB with a hole leading to the back exit like above.
So how does this improve anything. Is it that it limits the exiting air to the vac line and makes more flow through the baffle to the intake manifold?
Thanks,
al
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
see pics here:
http://www.s2performance.net/vettepage.html
the idea behind a ported TB is 2 things:
a) 75mm vs 78mm ported diam = 360mm^2 more cross sectional area at the most restrictive area of the throttle body. This results in mroe volume of airflow and contributes to the HP/TQ increase
b) the larger butterfly valve is what increases throttle response. Since the blade on the ported TB is larger, this means that it can be opened the same amount as an OEM size blade and flow more air.
http://www.s2performance.net/vettepage.html
the idea behind a ported TB is 2 things:
a) 75mm vs 78mm ported diam = 360mm^2 more cross sectional area at the most restrictive area of the throttle body. This results in mroe volume of airflow and contributes to the HP/TQ increase
b) the larger butterfly valve is what increases throttle response. Since the blade on the ported TB is larger, this means that it can be opened the same amount as an OEM size blade and flow more air.
Le Mans Master
Joined: Jun 2002
Posts: 8,352
Likes: 103
From: In the pit, trying to love someone.
see pics here:
http://www.s2performance.net/vettepage.html
the idea behind a ported TB is 2 things:
a) 75mm vs 78mm ported diam = 360mm^2 more cross sectional area at the most restrictive area of the throttle body. This results in mroe volume of airflow and contributes to the HP/TQ increase
b) the larger butterfly valve is what increases throttle response. Since the blade on the ported TB is larger, this means that it can be opened the same amount as an OEM size blade and flow more air.
http://www.s2performance.net/vettepage.html
the idea behind a ported TB is 2 things:
a) 75mm vs 78mm ported diam = 360mm^2 more cross sectional area at the most restrictive area of the throttle body. This results in mroe volume of airflow and contributes to the HP/TQ increase
b) the larger butterfly valve is what increases throttle response. Since the blade on the ported TB is larger, this means that it can be opened the same amount as an OEM size blade and flow more air.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
The sharp edges on the stock TB around the PCV inlet port causes a large turbulence in the incoming air flow path--The polished and ported ones get rid of that strange opening--fill it in--and eliminate the turbulence--This increases the maximum flow of air without increasing the actual size of the opening--Slimming the blade helps--as does slimming the screws--But thats really all you can do with a stock TB--You get better throttle reponse--maybe an 8 HP gain--
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
see pics here:
http://www.s2performance.net/vettepage.html
the idea behind a ported TB is 2 things:
a) 75mm vs 78mm ported diam = 360mm^2 more cross sectional area at the most restrictive area of the throttle body. This results in mroe volume of airflow and contributes to the HP/TQ increase
b) the larger butterfly valve is what increases throttle response. Since the blade on the ported TB is larger, this means that it can be opened the same amount as an OEM size blade and flow more air.
http://www.s2performance.net/vettepage.html
the idea behind a ported TB is 2 things:
a) 75mm vs 78mm ported diam = 360mm^2 more cross sectional area at the most restrictive area of the throttle body. This results in mroe volume of airflow and contributes to the HP/TQ increase
b) the larger butterfly valve is what increases throttle response. Since the blade on the ported TB is larger, this means that it can be opened the same amount as an OEM size blade and flow more air.
So just putting on a ported tb may not work, Unless there are the other properly match parts as an air intake that does not unless cause air turbulences, Properly and polished manifold( which is very easy to mess up, PP heads, proper LT headers and exhaust. Plus tunned to make it all work.
So making the whole package work together is the magic, not just bolt on and go.
Last edited by AU N EGL; Mar 24, 2008 at 07:44 AM.
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
The sharp edges on the stock TB around the PCV inlet port causes a large turbulence in the incoming air flow path--The polished and ported ones get rid of that strange opening--fill it in--and eliminate the turbulence--This increases the maximum flow of air without increasing the actual size of the opening--Slimming the blade helps--as does slimming the screws--But thats really all you can do with a stock TB--You get better throttle reponse--maybe an 8 HP gain--
That is the answer I was going to post. Filling in the hole and smoothing it out helps direct the airflow.
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Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,437
Likes: 5
Thanks for the info guys...i figured it had to do with smoothing the air flow.
How air enters the engine is really interesting. I saw a show on tv where they dyno'd a car before and after adding a 1/2 in riser under the carb and it yielded another 14 hp.
The reason given is that it increased air velocity.
Cool stuff!
How air enters the engine is really interesting. I saw a show on tv where they dyno'd a car before and after adding a 1/2 in riser under the carb and it yielded another 14 hp.
The reason given is that it increased air velocity.
Cool stuff!