How does the ported throttle body work?

[tjk_art]

I know it improves throttle response, but I'm curious what it does differently than the stock to do this?

[Monchy36]

More air... More power!

[shrinkdoc]

Just lets in more air do to the smoother bore.

[camaro_RS]

Some people claim to notice a difference and some claim to notice no difference whatsoever. Checking out the quarter times and dynos is the only way to really find out I suppose.

[SC2150]

Correct. Before and after dyno graphs and 1/4 mile times will show.

The only one we will use is the computer designed CNC ported VMax units that are done indentical every time.....and the gains are consistant due to this.

The science behind the VMax Spiral Pattern ported throttle bodies.

The inner throat of the GM throttle bodies is not a straight thru round tube like is ideal, but an uneven design with dips and humps, each of these variations causes a different type and severity of turbulence that is a hamper on the velocity the flow is capable of, thus less power. The first modification is to straighten this tube as much as possible as limited by the casting itself. The the pattern cut to increase velocity.

The pattern cut does several things that render the hand ported versions obsolete. #1 is the texture breaks up the molecular drag of the air flow along the TB throat as the intake air charge enters. A smooth surface creates friction & slows the flow along the sides creating turbulence (a wet flow bench with a high speed video slowed down shows this). The texture breaks that surface tension (think golf ball dimples and what they are capable of) and allows the intake air to flow equally in the center as it does around the sides. A high polished surface causes the most drag due to the surface tension present (Darin Morgan demonstrated this years back on their wet-flow bench with cylinder head & intake runners). Then, the slight swirl blends the air charge even more so even though the blade size is untouched, the CFM flow is increased as seen on the flow bench, but even more important is the velocity of the intake air charge. Velocity makes power, not just flow.

Bottom line is, the instant throttle response & increased lower RPM range power gains that make this a must have.

[Chang]

Must read!

Originally Posted by SC2150

Correct. Before and after dyno graphs and 1/4 mile times will show.

The only one we will use is the computer designed CNC ported VMax units that are done indentical every time.....and the gains are consistant due to this.

The science behind the VMax Spiral Pattern ported throttle bodies.

The inner throat of the GM throttle bodies is not a straight thru round tube like is ideal, but an uneven design with dips and humps, each of these variations causes a different type and severity of turbulence that is a hamper on the velocity the flow is capable of, thus less power. The first modification is to straighten this tube as much as possible as limited by the casting itself. The the pattern cut to increase velocity.

The pattern cut does several things that render the hand ported versions obsolete. #1 is the texture breaks up the molecular drag of the air flow along the TB throat as the intake air charge enters. A smooth surface creates friction & slows the flow along the sides creating turbulence (a wet flow bench with a high speed video slowed down shows this). The texture breaks that surface tension (think golf ball dimples and what they are capable of) and allows the intake air to flow equally in the center as it does around the sides. A high polished surface causes the most drag due to the surface tension present (Darin Morgan demonstrated this years back on their wet-flow bench with cylinder head & intake runners). Then, the slight swirl blends the air charge even more so even though the blade size is untouched, the CFM flow is increased as seen on the flow bench, but even more important is the velocity of the intake air charge. Velocity makes power, not just flow.

Bottom line is, the instant throttle response & increased lower RPM range power gains that make this a must have.

[Apex Chase]

Originally Posted by SC2150

Correct. Before and after dyno graphs and 1/4 mile times will show.

The only one we will use is the computer designed CNC ported VMax units that are done indentical every time.....and the gains are consistant due to this.

The science behind the VMax Spiral Pattern ported throttle bodies.

The inner throat of the GM throttle bodies is not a straight thru round tube like is ideal, but an uneven design with dips and humps, each of these variations causes a different type and severity of turbulence that is a hamper on the velocity the flow is capable of, thus less power. The first modification is to straighten this tube as much as possible as limited by the casting itself. The the pattern cut to increase velocity.

The pattern cut does several things that render the hand ported versions obsolete. #1 is the texture breaks up the molecular drag of the air flow along the TB throat as the intake air charge enters. A smooth surface creates friction & slows the flow along the sides creating turbulence (a wet flow bench with a high speed video slowed down shows this). The texture breaks that surface tension (think golf ball dimples and what they are capable of) and allows the intake air to flow equally in the center as it does around the sides. A high polished surface causes the most drag due to the surface tension present (Darin Morgan demonstrated this years back on their wet-flow bench with cylinder head & intake runners). Then, the slight swirl blends the air charge even more so even though the blade size is untouched, the CFM flow is increased as seen on the flow bench, but even more important is the velocity of the intake air charge. Velocity makes power, not just flow.

Bottom line is, the instant throttle response & increased lower RPM range power gains that make this a must have.

Great explanation Tracy.

[SC2150]

Rottler has patented their CNC program that now uses similar pattern cuts in their cylinder head and intake manifold porting so we should be seeing examples of this expanding in many areas of porting and there is a special textured "wrap" that some of the NASCAR teams are testing for reduced drag.....but I camt see the rules allowing it.

[Apex Chase]

Originally Posted by SC2150

Rottler has patented their CNC program that now uses similar pattern cuts in their cylinder head and intake manifold porting so we should be seeing examples of this expanding in many areas of porting and there is a special textured "wrap" that some of the NASCAR teams are testing for reduced drag.....but I camt see the rules allowing it.

That is interesting stuff. I read something about those textured wraps a while back but instead of it being used for high performance reasons it was applied to a Prius for improved fuel economy.

[midwest mcnasty]

so what does it cost?

[SC2150]

$150 plus $200 refundable core charge....ask Chase to order.

[Apex Chase]

Originally Posted by SC2150

$150 plus $200 refundable core charge....ask Chase to order.

Thank you for the referral.

[MagnumForceGB]

You twisted my arm, I ordered one from Apex. How much will this effect my fuel trims?