Ported Throttle Body
12-31-2006, 04:26 PM
#2
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Join Date: Mar 2005
Location: Aurora, IL
Posts: 12,312
BBK is a namebrand, just like Holley and AS&M, so they will sell you a brand new 52mm or 58mm throttle body right out of the box, they will not port your existing throttle body. As for a ported stock throttle body, I have heard of people getting them off of ebay.
12-31-2006, 05:22 PM
#3
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Join Date: Sep 2004
Location: Canfield, OH
Posts: 271
I need to upsize to a 58 mm TB.
I was hoping to buy one from someone who ports them and then re-sells them. I currently have a 52mm BBK, so I thought I would stick with that brand.
Anyway, I guess I will buy a new one and try to find someone who ports them.
Who is the best to have this done?
How much does it cost and what are the gains in airflow?
I was hoping to buy one from someone who ports them and then re-sells them. I currently have a 52mm BBK, so I thought I would stick with that brand.
Anyway, I guess I will buy a new one and try to find someone who ports them.
Who is the best to have this done?
How much does it cost and what are the gains in airflow?
12-31-2006, 07:08 PM
#7
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,825
I need to upsize to a 58 mm TB.
I was hoping to buy one from someone who ports them and then re-sells them. I currently have a 52mm BBK, so I thought I would stick with that brand.
Anyway, I guess I will buy a new one and try to find someone who ports them.
Who is the best to have this done?
How much does it cost and what are the gains in airflow?
I was hoping to buy one from someone who ports them and then re-sells them. I currently have a 52mm BBK, so I thought I would stick with that brand.
Anyway, I guess I will buy a new one and try to find someone who ports them.
Who is the best to have this done?
How much does it cost and what are the gains in airflow?
Since you primary mod appears to be the 175-shot of nitrous, its not likely that the 52mm BBK is even holding you back.
01-01-2007, 03:17 PM
#8
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Join Date: Sep 2004
Location: Canfield, OH
Posts: 271
I've just upgraded to a 355 and am having Lloyd Elliot prepare my LT4 heads to use the LE3 cam.
I need to upgrade to a 58 mm TB. I see guys list in their mods that they have ported TBs.
Just wanted to know more about them like who ports them, how much does it cost, and what are the performance gains in airflow?
Can't seem to find anything when I did a search.
I need to upgrade to a 58 mm TB. I see guys list in their mods that they have ported TBs.
Just wanted to know more about them like who ports them, how much does it cost, and what are the performance gains in airflow?
Can't seem to find anything when I did a search.
01-01-2007, 08:20 PM
#10
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Thread Starter
Join Date: Sep 2004
Location: Canfield, OH
Posts: 271
Let's start over:
You can port/polish heads, intake manifolds and carbs to increase airflow. Easy concept to grasp.
You can buy carbs in different stages of porting/polishing which incrementally increase the airflow.
Fluid dynamics dictates that the amount of air to pass through an orifice is NOT just related to the size of the orifice (increasing from 52 to 58 mm). There are many factors related including direction of incoming air, directing the air over the blades, inlet coefficients, roughness coefficients, etc., etc.
So, I'll rephrase my question:
With a 58 mm out-of-the-box throttle body (BBK, Holley, etc), what work can be done to it to increase the air-flow?
If the airflow can be increased, does anybody know of someone who does the work?
It seems strange to me that all we can do is use out-of-the-box TBs.
You can port/polish heads, intake manifolds and carbs to increase airflow. Easy concept to grasp.
You can buy carbs in different stages of porting/polishing which incrementally increase the airflow.
Fluid dynamics dictates that the amount of air to pass through an orifice is NOT just related to the size of the orifice (increasing from 52 to 58 mm). There are many factors related including direction of incoming air, directing the air over the blades, inlet coefficients, roughness coefficients, etc., etc.
So, I'll rephrase my question:
With a 58 mm out-of-the-box throttle body (BBK, Holley, etc), what work can be done to it to increase the air-flow?
If the airflow can be increased, does anybody know of someone who does the work?
It seems strange to me that all we can do is use out-of-the-box TBs.
01-01-2007, 08:43 PM
#11
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Join Date: Feb 2006
Location: Marcy, NY
Posts: 355
Let's start over:
With a 58 mm out-of-the-box throttle body (BBK, Holley, etc), what work can be done to it to increase the air-flow?
If the airflow can be increased, does anybody know of someone who does the work?
It seems strange to me that all we can do is use out-of-the-box TBs.
With a 58 mm out-of-the-box throttle body (BBK, Holley, etc), what work can be done to it to increase the air-flow?
If the airflow can be increased, does anybody know of someone who does the work?
It seems strange to me that all we can do is use out-of-the-box TBs.
01-01-2007, 09:48 PM
#14
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,825
If you need more flow than a dual 58mm throttle body can flow efficiently, go to an AS&M Monoblade.
Have you ever looked at the details of one of the 58mm TB's? They include the equivalent of an "airfoil", and the ports are generally highly polished, and have a nice, uniform taper..... all of which help improve flow.
Stock TB:
Holley 58mm:
Have you ever looked at the details of one of the 58mm TB's? They include the equivalent of an "airfoil", and the ports are generally highly polished, and have a nice, uniform taper..... all of which help improve flow.
Stock TB:
Holley 58mm:
01-01-2007, 10:04 PM
#15
Registered User
Join Date: Mar 2002
Location: Ocala, Florida
Posts: 3,245
Let's start over:
You can port/polish heads, intake manifolds and carbs to increase airflow. Easy concept to grasp.
You can buy carbs in different stages of porting/polishing which incrementally increase the airflow.
Fluid dynamics dictates that the amount of air to pass through an orifice is NOT just related to the size of the orifice (increasing from 52 to 58 mm). There are many factors related including direction of incoming air, directing the air over the blades, inlet coefficients, roughness coefficients, etc., etc.
So, I'll rephrase my question:
With a 58 mm out-of-the-box throttle body (BBK, Holley, etc), what work can be done to it to increase the air-flow?
If the airflow can be increased, does anybody know of someone who does the work?
It seems strange to me that all we can do is use out-of-the-box TBs.
You can port/polish heads, intake manifolds and carbs to increase airflow. Easy concept to grasp.
You can buy carbs in different stages of porting/polishing which incrementally increase the airflow.
Fluid dynamics dictates that the amount of air to pass through an orifice is NOT just related to the size of the orifice (increasing from 52 to 58 mm). There are many factors related including direction of incoming air, directing the air over the blades, inlet coefficients, roughness coefficients, etc., etc.
So, I'll rephrase my question:
With a 58 mm out-of-the-box throttle body (BBK, Holley, etc), what work can be done to it to increase the air-flow?
If the airflow can be increased, does anybody know of someone who does the work?
It seems strange to me that all we can do is use out-of-the-box TBs.
People just run out of the box TB's because they flow more than what 99% of the people on here need. AS&M advertises their 58mm as flowing 1050 CFM, the intake manifold would become a restriction before the TB. And if the throttle body won't flow enough, all you do is buy a bigger one (ie monoblade) instead of buying a smaller one and spending $$ on porting.
Just because someone runs xxx doesn't mean the throttle body isn't a restriction. There are stock headed LS1's runnin bottom 10's but that doesn't mean their heads aren't holding them back at all.
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