TPI Intakes and "Radiused Inlets"

[NewbVetteGuy]

Grumpy et al,

I've read a number of your TPI articles / article collections and you show increased flow numbers for each of the long-runner alternative intakes with "3/8" radiused inlets". -Is this referring to a radiused / "bellmouth" entry ahead of the throttle body or a radiused entry at the plenum to runner inlets?

-If the latter, how exactly is an "ideal" inlet created on these? (Assuming some special tool)


How does a radius entry impact the wave tuning and strength of the waves that are essentially what creates the torque that these intakes are known for? (I've heard whispers and rumors that different inlets shapes can make a runner "act" smaller or larger and that radiused inlets may slightly increase the strength of the reflected waves, too....)



Thanks,
Adam

 

[Grumpy]

Im not 100% sure of what your referring too here, reducing edges and opening port entrances can have a significant positive effect on flow.
perhaps the links will help
http://garage.grumpysperformance.com/index.php?threads/just-how-restrictive-are-the-stock-tpi-engine-components.1509/

http://garage.grumpysperformance.com/index.php?threads/porting-can-help.462/page-3#post-89223

http://garage.grumpysperformance.com/index.php?threads/port-speeds-and-area.333/#post-72826

http://garage.grumpysperformance.com/index.php?threads/c4-larger-intake-runners-l98-tpi.13785/#post-72541

http://garage.grumpysperformance.com/index.php?threads/port-matching-procedure-step-by-step-guide-with-pictures.5378/#post-71848

http://garage.grumpysperformance.com/index.php?threads/unshrouding-valves-and-polishing-combustion-chambers.2630/#post-13145

http://garage.grumpysperformance.com/index.php?threads/tpi-intakes-throttle-bodies-and-plenum-entrances.14353/#post-73666

http://garage.grumpysperformance.com/index.php?threads/tpi-flow-info.10382/#post-42908



stealth ram>

stealthram base

you may be amazed to find a great deal of research and testing has been done and theres actually proven facts rather than random guess work to use in planing a well built engine combo

stock un-ported runner entrances above
a very noticeable flow increase with proper porting done

The concept of port matching an intake manifold to a head is to ensure the flow of air to the cylinder is as big, smooth, and efficient as possible for maximum power. By ensuring the mating surfaces of the intake manifold and head have holes that match perfectly will help air flow through the engine.

Port Matching - Intake & Head Porting - Tech - How To - Circle Track

A tech article on match porting your intake manifold and heads. Find all the details inside Circle Track Magazine

www.motortrend.com

http://garage.grumpysperformance.co...ive-are-the-stock-tpi-engine-components.1509/

 

[NewbVetteGuy]

Thanks. I was referring to the entrance to the runners in my FIRST Fuel Injection intake (inside the plenum).

They are already "rounded", but my understanding was that there's an ideal radiused shape and some sort of cutter tool to make them a perfect radiused shape, no?


Adam

 

[Grumpy]

I would not worry , that first intake flows better ,
than most of the heads its going to be matched too,
so while smoothing and rounding the runner entrances will marginally increase the air flow the gains will be minimal,
I've generally used the abrasive flapper attachments,
just try to get a smooth & uniform rounded contour ,
theres good info here

http://garage.grumpysperformance.com/index.php?threads/porting-can-help.462/page-3#post-89223