Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Cold air vs. Air Volume question

Discussion in 'The Garage' started by opfor2, May 12, 2006.

  1. opfor2

    opfor2 1/2 ton status

    Joined:
    Oct 28, 2002
    Posts:
    375
    Likes Received:
    0
    Location:
    Ventura County, CA
    What's more beneficial for my engine ??? I just replaced the stock exhaust manifold with a Edelbrock TES system, added a K&N air filter and I removed the stock restrictive black plastic cold air intake tube. The Air filter now sucks air directly out of the engine compartment. Now my question is whats better ? Having cooler but more restrictive air enter the engine or using the hot engine air with out any restrictions? I'm guessing that using the free flowing hot air would be better than using the cold air tube.

    thanks

    Dan
     
  2. Cmoe

    Cmoe 1/2 ton status

    Joined:
    Feb 19, 2000
    Posts:
    2,884
    Likes Received:
    0
    Location:
    Mesa,AZ
    that depend on how you look at it.... colder the air molicuals the smaller they are and more can be stuffed into the cylinder. But your limmiting the amount of air you can suck into with cool air. If you change to an open or no duck work you may be able to suck more air, but it's bigger and doesn't allow any more into the cylinder.... I would go with a dual snorkle cool air like a ram air system... or make your own....
     
  3. 79k20350

    79k20350 3/4 ton status

    Joined:
    Nov 22, 2004
    Posts:
    7,757
    Likes Received:
    1
    Location:
    Ct
    the motor probably isnt pulling more air than the intake can supply, meaning the cold air is better than less restrictive. This is because there is already little restriction but the colder air is an added benefit.
     
  4. 85mudblazin

    85mudblazin 1/2 ton status

    Joined:
    Mar 26, 2004
    Posts:
    3,951
    Likes Received:
    0
    Location:
    Austin,TX
    From what I have heard cold air on a carb'd motor doesnt do much like it would on a newer injected motor. So for a carb'd motor your looking for volume where as if you were injected you would be looking for that cold charge.
     
  5. mechted

    mechted 1 ton status Premium Member

    Joined:
    Oct 19, 2003
    Posts:
    767
    Likes Received:
    2
    Location:
    Granbury, TX
    Cold air is better for the engine. Elevation of the air intake temperature can cause significant power losses, becuase the engine works by raising the temperature of the air to very high, then extracting the heat via expansion. By increasing your intake temperature, you effectively kill off the 40 degrees or more worth of power you can recover. For example: many (if not most) modern power plants run an air conditioning system to regulate the intake temperature so they can run at peak efficiency. That is kinda the extreme case, but cooler intake temps really help.

    And you are not highly restricting the air flow. Look at the size of the primaries on a carb, that is about how much unrestricted air flow you need. Unless the duct was kinked or blocked, it will help.
     
  6. 79k20350

    79k20350 3/4 ton status

    Joined:
    Nov 22, 2004
    Posts:
    7,757
    Likes Received:
    1
    Location:
    Ct
    Never heard such a thing...The principles are still the same. Cold air = more oxygen molecules= more power
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,982
    Likes Received:
    191
    Location:
    Roy WA
    The only real way to prove it would be to flow the stock ducting. But given that most small blocks only need around 600CFM (generally) it seems pretty unlikely the stock ducting is a restriction to worry about.

    You can flip the air cleaner lid to get the sound, it doesn't mean you are making more power :)
     
  8. 79k20350

    79k20350 3/4 ton status

    Joined:
    Nov 22, 2004
    Posts:
    7,757
    Likes Received:
    1
    Location:
    Ct
    That my point, i doubght the duct work is going to be the restrictive part...
     
  9. 85mudblazin

    85mudblazin 1/2 ton status

    Joined:
    Mar 26, 2004
    Posts:
    3,951
    Likes Received:
    0
    Location:
    Austin,TX
    If you want to get that in depth with air flow then yes the ducting would hurt performance because it is not smooth inside. This is going to cause turbulane in the air which equals less flow.
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,982
    Likes Received:
    191
    Location:
    Roy WA
    But the question is "how much", and without actual testing, I don't believe it's answerable definitively.
     
  11. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    Where'd you hear it was restrictive? Sounds like one of those "ASSumptions" to me..

    As someone pointed out, look at the bore sizes of a carb or TBI... I'm pretty certain that tube is flowing hella more than your taking in.. It's not like your spinning 7 grand...

    All that being said, I plan to eventually change my single feed to a duel at some point.. But I'd much prefer the cold single intake to an open element, especially on a TBI...
     
  12. opfor2

    opfor2 1/2 ton status

    Joined:
    Oct 28, 2002
    Posts:
    375
    Likes Received:
    0
    Location:
    Ventura County, CA

    Hmmm, I never really looked at it that way. The "cold Air" openings in the radiator support appears to be the same size or bigger that my TBI so I guess it's flowing more that what's required. I'll be putting my cold air tube back on. Thanks for all the input. Happy 4x4ing.

    Dan..
     

Share This Page