Author Topic: Vent Grille Mesh  (Read 8712 times)

aeauto

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 100
  • Member Rating Points: +0/-0
Re: Vent Grille Mesh
« Reply #19 on: June 07, 2014, 10:41:44 AM »
Charley is right about this.  When air passes through a hole or around an object, which it is doing when going through the screen, it creates swirls and eddies.  This restricts flow.  Even if the area is the same for both size holes, the larger holes will have less place to create these restrictions so more air flows.  This is the principal used when making firearm suppressors.  You want to create disturbances in the flow to slow it down.  So a panel with larger holes will flow better than one with smaller holes even if the overall area is the same.

Purple LP670 SV

  • Lambo Mafia
  • Global Moderator
  • Trade Count: (+11)
  • Hero Member
  • *****
  • Posts: 635
  • Member Rating Points: +17/-0
  • Big Gulps, huh? All right! Well, see ya later.
Re: Vent Grille Mesh
« Reply #18 on: June 06, 2014, 05:05:53 PM »
I'll be using this stuff!!!  ::headbang
I met a man with a dollar, we exchanged dollars and we still had a dollar. I met a man with an idea, we exchanged ideas and now we both have two ideas!!!

Digibeam

  • Trade Count: (+2)
  • Sr. Member
  • ****
  • Posts: 449
  • Member Rating Points: +11/-0
  • Show me, don't Tell me...
Re: Vent Grille Mesh
« Reply #17 on: June 06, 2014, 03:37:11 PM »
I believe 78% is relative to the material used and not an all encompassing factor.
100 gph flow through a garden hose will have a far higher restriction than through a 2" hose and way more than a 4" hose.
Maybe the perspective is not what is being discussed directly, but I can see both sides of the discussion and you are both right from one perspective or another.
 ::K

01Lambiero

  • Trade Count: (+1)
  • Hero Member
  • *****
  • Posts: 944
  • Member Rating Points: +21/-3
  • "Using the skills that God gave me"
Re: Vent Grille Mesh
« Reply #16 on: June 06, 2014, 03:34:46 PM »
I will disagree.   I posted different types of grille material that will make a replica/clone build look good and almost oem.  You can differ on what to use all you want.  If you want to run 3/8" chickenwire, use it.  It's your build and you can decide to make it anyway you want.
20 yr. GM Niase certified Auto Mechanic (Tune-Up, Brakes, & Heavy Repair)
24 yr. GM Automated/Robotic Welding Systems
Retired

76mx

  • Trade Count: (+2)
  • Hero Member
  • *****
  • Posts: 630
  • Member Rating Points: +12/-0
Re: Vent Grille Mesh
« Reply #15 on: June 06, 2014, 02:35:07 PM »
No it is not the same airflow, it is the same open area but it is not the same airflow, bet you a beer on it or agree to disagree.

01Lambiero

  • Trade Count: (+1)
  • Hero Member
  • *****
  • Posts: 944
  • Member Rating Points: +21/-3
  • "Using the skills that God gave me"
Re: Vent Grille Mesh
« Reply #14 on: June 06, 2014, 10:42:56 AM »
78% = 78%  Same air flow cfm if the cross sectional area is the same.
« Last Edit: June 06, 2014, 10:44:48 AM by 01Lambiero »
20 yr. GM Niase certified Auto Mechanic (Tune-Up, Brakes, & Heavy Repair)
24 yr. GM Automated/Robotic Welding Systems
Retired

lambo_sam

  • 3% CLUB MEMBER
  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 194
  • Member Rating Points: +10/-0
  • So. Cal, living the lambo dream everyday!
    • https://www.flickr.com/photos/147611676@N08/albums
Re: Vent Grille Mesh
« Reply #13 on: June 06, 2014, 05:00:30 AM »

76mx

  • Trade Count: (+2)
  • Hero Member
  • *****
  • Posts: 630
  • Member Rating Points: +12/-0
Re: Vent Grille Mesh
« Reply #12 on: June 05, 2014, 10:47:27 PM »
Yes but what I am saying is that 78% with 3/8" holes will flow more air than 78% with 1/4" holes. If both have the same 78% open area, the bigger hole flows better. And since airflow is exponential, it flows better (or the other flows worse) the faster you go.

01Lambiero

  • Trade Count: (+1)
  • Hero Member
  • *****
  • Posts: 944
  • Member Rating Points: +21/-3
  • "Using the skills that God gave me"
Re: Vent Grille Mesh
« Reply #11 on: June 05, 2014, 07:03:54 PM »
Kool.  I was searching for the diamond pattern but couldn't find any that had a diamond smaller than 1/2'x1" which is way to large.  What is the actual measurement on the OEM in the pic?  Here is a pic of what I was trying to find for my Diablo. 

76mx:  When any object is place in the path of air flow, you will see a reduction in velocity.  The larger the object the less air flow.  Speeding up the velocity is a way to compensate.  When manufacturers state open area of a mesh, they are subtracting the cross sectional area of the material that makes up the mesh.  We gotta keep those birds and june bugs out of the radiator.  78% open is better than 59% open.

McNichols.com wants me to purchase a full sheet 3'x10'.  Probably would do 4 cars at least ($100)  I'm going to go with the Custom Car Grills.com as it comes in powder coat black.  Jim
« Last Edit: June 05, 2014, 09:01:50 PM by 01Lambiero »
20 yr. GM Niase certified Auto Mechanic (Tune-Up, Brakes, & Heavy Repair)
24 yr. GM Automated/Robotic Welding Systems
Retired

Digibeam

  • Trade Count: (+2)
  • Sr. Member
  • ****
  • Posts: 449
  • Member Rating Points: +11/-0
  • Show me, don't Tell me...
Re: Vent Grille Mesh
« Reply #10 on: June 05, 2014, 04:40:51 PM »
This is the mesh used on the OEM parts I have,
The grill is a slight diamond shape and very thin but fairly strong in its mounted position

76mx

  • Trade Count: (+2)
  • Hero Member
  • *****
  • Posts: 630
  • Member Rating Points: +12/-0
Re: Vent Grille Mesh
« Reply #9 on: June 05, 2014, 12:47:12 PM »
Much better! Life Rule #42, "One test is worth a thousand engineers".

01Lambiero

  • Trade Count: (+1)
  • Hero Member
  • *****
  • Posts: 944
  • Member Rating Points: +21/-3
  • "Using the skills that God gave me"
Re: Vent Grille Mesh
« Reply #8 on: June 05, 2014, 12:44:10 PM »
Custom Car Grilles at customcargrills.com has this to offer:

Raw Material: Aluminum
Raw Thickness: 0.064" / 14 Gauge
Open Area: ~ 77%
Pricing:
6"x36": $15.99
16"x48": $44.99
Plain Silver (standard)
Black Powder Coated: +$10

 



 
« Last Edit: June 05, 2014, 12:45:52 PM by 01Lambiero »
20 yr. GM Niase certified Auto Mechanic (Tune-Up, Brakes, & Heavy Repair)
24 yr. GM Automated/Robotic Welding Systems
Retired

76mx

  • Trade Count: (+2)
  • Hero Member
  • *****
  • Posts: 630
  • Member Rating Points: +12/-0
Re: Vent Grille Mesh
« Reply #7 on: June 05, 2014, 12:25:34 PM »
Tallon, no harm no foul. O1L, I am just trying to help here. I am not suggesting to use chicken wire but the material you selected will not work. It might for the other openings, but not for the radiator. Many years ago Joe at Inland Exotics told me never to use any material for a grille that could also be used to house small animals. He had his other faults, but that was sound advice. You owe me absolutely nothing, but because you seem to be a knowlegable and prudent builder, I still ask a big favor. Purchase a few square feet of the mesh and refer back to the fan experiment. Place it in front of a typical house fan on low and note how little air flows through it. Now turn the fan to a higher CFM and see how much LESS air flows through it. I am no expert on boundary layers and such, I have learned all of this the hard way. Again just trying to help. 

Tallon

  • Trade Count: (+4)
  • Hero Member
  • *****
  • Posts: 1257
  • Member Rating Points: +18/-5
Re: Vent Grille Mesh
« Reply #6 on: June 05, 2014, 11:19:10 AM »
If it depends on what you are building, what exactly would you build where overheating would be acceptable? And every racecar that I ever built was darn pretty.
I only said that because you mentioned going over 100mph would cause overheating and I don't know of any road where that would be legal.
Race cars could look good I'm sure but most I've seen aren't made to look show car good :S
« Last Edit: June 05, 2014, 11:24:20 AM by Tallon »

01Lambiero

  • Trade Count: (+1)
  • Hero Member
  • *****
  • Posts: 944
  • Member Rating Points: +21/-3
  • "Using the skills that God gave me"
Re: Vent Grille Mesh
« Reply #5 on: June 05, 2014, 10:07:57 AM »
On my Diablo, I need to put mesh on each rear radiator, rocker intakes, quarter panel air intakes, engine compartment vents, muffler compartment vent, and engine air intake.  I don't know if I will need any on the front of the car yet.  It's hard to locate exact oem metal mesh but I do like the hexagon mesh so will probably go with that.  Whether Diablo or Murcie, you will have to watch the air flow to your radiators regardless.  If you are going with a 57% air flow and compensating with a higher cfm fan, you might end up in a pinch.  We all want our builds to be Kool and Cool.

Jim
20 yr. GM Niase certified Auto Mechanic (Tune-Up, Brakes, & Heavy Repair)
24 yr. GM Automated/Robotic Welding Systems
Retired