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j-code intake

Discussion in '1982-Present GM Diesel' started by 6.2L Jimmy, Jan 22, 2002.

  1. 6.2L Jimmy

    6.2L Jimmy 1/2 ton status

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    Hey All,

    What are the benefits of a J-code intake?
    And also will 3 degrees of timing advance improve power.
    What can I do for cheap power?

    Thanks in advance.
    Mike


    1989 GMC Jimmy 6.2L 4x4,1969 Camaro Z/28 502 C.I. B.B.C.
    BLOOD,SWEAT AND GEARS!
     
  2. Oblin Goblin

    Oblin Goblin 1/2 ton status

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    A J intake flows better because it doesn't have the EGR valve that mounts in the center of the C intake blocking airflow. I imagine installing a J intake would also improve power by keeping the intake air cooler too. The C intake has an exaust passage right through the intake manifold. My intake manifold used to get hot to the touch before I put in a J intake. If you have dual exaust you will want to intall a balance pipe between the duals to get the most out of that setup. The exaust passage in the C intake manifold acts like a balance pipe for the light duty engines. Advancing the timing will help power some but mostly you'll notice an improvment in throttle responce. I noticed a small increace in power when I used the Stanadyne fuel addative. I didn't notice any change with any of the others I've tried though. If you get an EGT gauge you can turn up the fuel a little. Just make sure you watch the EGT gauge so you don't fry a piston, 1100 degrees F max. Besides that any way you could improve intake and exaust flow would help.
     
  3. 6.2L Jimmy

    6.2L Jimmy 1/2 ton status

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    Hey, Thanks for the informative answer.
    I switched to stanadyne performance formula about 8 months ago and I too noticed an immediate difference with the stuff.
    Costs more but is way worth it .
    Thanks again.

    Mike


    1989 GMC Jimmy 6.2L 4x4,1969 Camaro Z/28 502 C.I. B.B.C.
    BLOOD,SWEAT AND GEARS!
     

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