Rember the intake port texture debates?

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
BradH
Guru
Guru
Posts: 1186
Joined: Wed Apr 03, 2013 11:34 am
Location:

Rember the intake port texture debates?

Post by BradH »

Well, I guess we can drag up the golf ball-type surface topic again now that a well-known engine builder is offering it as an upgrade to their regular CNC programs: http://www.besracing.com/cylinder-head- ... t-dimpling

:lol:
Carnut1
Guru
Guru
Posts: 4659
Joined: Tue Jun 11, 2013 6:32 pm
Location: Melbourne fl.

Re: Rember the intake port texture debates?

Post by Carnut1 »

Just add $400 to the cnc price.
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST
BradH
Guru
Guru
Posts: 1186
Joined: Wed Apr 03, 2013 11:34 am
Location:

Re: Rember the intake port texture debates?

Post by BradH »

Carnut1 wrote:Just add $400 to the cnc price.
And what do you get for your $$$?

Is this now considered a given way to improve the induction system performance, or does the discussion still go on... just not in this thread? :wink:
mag2555
Guru
Guru
Posts: 4584
Joined: Sun Sep 18, 2011 11:31 am
Location: Heading for a bang up with Andromeda as we all are.

Re: Rember the intake port texture debates?

Post by mag2555 »

No debate in my mind from along time ago, like how fast super stockers where even before they threw in the Towel and allowed porting!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
1989TransAm
Guru
Guru
Posts: 15481
Joined: Thu Feb 15, 2007 8:43 pm
Location: Cypress, California

Re: Rember the intake port texture debates?

Post by 1989TransAm »

Does this work better with a carburetor or EFI? Dry air or "wet" air? Or does it not matter?
steve cowan
Guru
Guru
Posts: 2253
Joined: Wed Jul 27, 2011 5:22 am
Location: brisbane AUSTRALIA

Re: Rember the intake port texture debates?

Post by steve cowan »

jim mcfarland was doing the dimpling deal back in the day when he was with edelbrock
intake ports and combustion chambers,its nothing new i personally like the burr finish that chad does on his cylinder heads
steve c
"Pretty don't make power"
user-23911

Re: Rember the intake port texture debates?

Post by user-23911 »

Another marketing gimmick.

Most of the gains are at the seat.






But they look really pretty so must therefore work?
mag2555
Guru
Guru
Posts: 4584
Joined: Sun Sep 18, 2011 11:31 am
Location: Heading for a bang up with Andromeda as we all are.

Re: Rember the intake port texture debates?

Post by mag2555 »

Highly efficient seats are not the key to real good BSFC numbers!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
User avatar
Caprimaniac
Guru
Guru
Posts: 1060
Joined: Fri Nov 18, 2011 1:17 pm
Location: NORWAY

Re: Rember the intake port texture debates?

Post by Caprimaniac »

joe 90 wrote:Another marketing gimmick.

Most of the gains are at the seat.

But they look really pretty so must therefore work?
Any w/wo dimpling tests on dyno or track? (Same engine, has to be max-effort deal, heads identical , same CNC shape/volume runners- dimpling ONLY difference)

Someone stated "all pro top teams want them", which do mean it Works?
How to turn GURU in an instant.....
77cruiser
Guru
Guru
Posts: 1484
Joined: Fri Dec 29, 2006 10:32 pm
Location: I Falls MN
Contact:

Re: Rember the intake port texture debates?

Post by 77cruiser »

Normal CNC porting leaves a somewhat rough texture, why would that be better?
Jim
mag2555
Guru
Guru
Posts: 4584
Joined: Sun Sep 18, 2011 11:31 am
Location: Heading for a bang up with Andromeda as we all are.

Re: Rember the intake port texture debates?

Post by mag2555 »

Velocity changes within a port make for pressure changes.
Pressure changes make for fuel drop out.
Drops of fuel love to cling to a smooth surface and not break back up into finer easy to burn state no less vaporize!
This makes for more fuel being needed to make a given level of power and can lead to fuel wash on the cylinders walls and fast waring rings and Bores.

To prove this happens just place a drop of water on a stone kitchen counter top and then blow on it.
All the water does is stay in a ball, but move around the counter top.
Next place a drop OD water on some 80 to 120 grit sand paper and blow on it, now you will see the ball of water break up into a mist , or at least far finer drops!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
user-9274568

Re: Rember the intake port texture debates?

Post by user-9274568 »

smooth or rough, that fuel is on the walls of the manifold/ports, period.

The finer the fuel droplets are (better atomized) in the combustion chamber the faster and more completely they burn. This creates more power out of the same amount of fuel and less emissions because there is less raw and unburnt gas running out of the exhaust.
User avatar
Rick Finsta
Pro
Pro
Posts: 370
Joined: Sat Sep 13, 2014 10:22 am
Location:

Re: Rember the intake port texture debates?

Post by Rick Finsta »

The fuel puddling is seen very easily in EFI systems with datalogging. In fact, the best systems use OEM-style "wall-wetting" transient algorithms to account for the dynamic conditions that affect addition to and subtraction from the "puddle."
Mike Gallo, President
Protohawk - Design/Prototyping, Small Project Support, and Contract Manufacturing
CCA Racing Products - Torque Plates and Engine Rebuild Tooling
Frankshaft
Guru
Guru
Posts: 1037
Joined: Sun Jul 05, 2015 6:01 pm
Location:

Re: Rember the intake port texture debates?

Post by Frankshaft »

Ever take a high mileage Ls head apart? You can see the pattern on the port walls where the fuel is spraying and "pressure" washing the port walls, the rest of port usually has a suprising amount of carbon and gook built up on them.
Carnut1
Guru
Guru
Posts: 4659
Joined: Tue Jun 11, 2013 6:32 pm
Location: Melbourne fl.

Re: Rember the intake port texture debates?

Post by Carnut1 »

If there was anywhere this would be beneficial a high speed ssr comes to mind. If surface texture would help the air stay attached at higher speed before separation that would make a ssr that is shape challenged perform better.
Servedio Cylinder Head Development
631-816-4911
9:00am - 9:00pm EST
Post Reply