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EGR ???

Discussion in 'The Garage' started by apache7, Sep 19, 2003.

  1. apache7

    apache7 Registered Member

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    Is the EGR valve a needed part?
    Does it affect engine performance at all?
    Pros and cons of using one or not?
    Ported or direct vacume?

    This is for a NON emissions compliant 350ci. /forums/images/graemlins/smile.gif
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    Is the EGR valve a needed part?
    Does it affect engine performance at all?
    Pros and cons of using one or not?
    Ported or direct vacume?
    This is for a NON emissions compliant 350ci. /forums/images/graemlins/smile.gif

    [/ QUOTE ]

    1. No

    2. No negative effect when working correctly. It slightly cools the combustion chamber under part throttle conditions for less chance of detonation. It is closed under WOT and idle conditions when working correctly.

    3. Pro is the cooling effect it has on the combustion chamber. Con is that it requires vacuum lines and if it acts up, it can make your truck run like crap.

    4. Stock setup is manifold vacuum, but through a TVS so no vacuum flows to it until the engine reaches operating temperature. Having EGR flowing when the engine is cold could cause some driveability issues.

    I personally believe that the costs out weigh the benefits so I don't run one. Others disagree. Hillbillies that don't understand it may remove it simply because it's an emissions device.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    No
    No
    Better mileage, less emissions. Big giant nasty vacuum line and cannister sitting on your intake.
    Ported via the EGR port if Q-jet. (there are typically two different ported sources on a Q-jet)

    If you remove EGR from a vehicle with a carb set up for EGR, you run a very real risk of screwing up your engine. Part throttle cruise WITH EGR is figured into the mixture delivered by the primary rods. Removing EGR without "recalibrating" the primary rods and/or jets will cause the engine to run lean at cruise.

    EGR doesn't hurt actual performance one iota. EGR is only being introduced during part throttle, which means that WOT power output isn't influenced.

    EGR reduces combustion temp, but it also "false fills" the cylinder, in effect reducing the cylinder size, which can be used to increase MPG.
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Is there an echo in here?
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Thats what I get for opening the window, starting to respond, then being distracted.
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Dude you don't live next door and I didn't yell the answer to you.
     
  7. apache7

    apache7 Registered Member

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    Thank you for the replies. I have removed all of the emissions junk on my 84 already. I had left the egr on, but unhooked. My truck pass's the sniffer here in RI with flying colors. Just a matter of keeping it tuned up. Much better than when I lived in AZ. No hose went unchecked there.
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Passed without cats or EGR huh?
     
  9. apache7

    apache7 Registered Member

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    I have two hi flow cats. Passed fine with none of the other stuff...
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Ahh...I didn't think anything that new would pass without cats. I made my friend's '79 Camaro pass though.
     
  11. apache7

    apache7 Registered Member

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    There are many ways to get it done as long as the enviro cops do not open the hood.
     
  12. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I agree, but its very hard to do it without cats. Nearly impossible.
     

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