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.

Soft tops and exhaust fumes

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by blackwidowk5, Mar 13, 2001.

  1. blackwidowk5

    blackwidowk5 1/2 ton status

    Joined:
    Dec 1, 2000
    Posts:
    107
    Likes Received:
    0
    Location:
    Richmond, Virginia
    When ever i roll the back window down in my blazer and drive around the exhaust get sucked into the truck. I was wondering if this happens with soft tops too. If i put a soft top on will i be smell my exhaust constantly? It's a '79 by the way.
    thanks
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,982
    Likes Received:
    191
    Location:
    Roy WA
    how is your exhaust routed? In the stock location, even with duals, i had no problem with that on my '83. You drive with the front windows down too I assume?

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  3. Confederate9

    Confederate9 1/2 ton status

    Joined:
    May 29, 2000
    Posts:
    1,686
    Likes Received:
    0
    Location:
    Greensboro NC
    well i have dual straight out the back, and it comes in with the rear window down. when i have front windows down not as much comes in.
    but when the top is completly off, i dont smell them AT ALL!!!

    <A target="_blank" HREF=http://confederate9.coloradok5.com/>http://confederate9.coloradok5.com/</A>
    <font color=red>K5: Because size DOES matter</font color=red>
    [​IMG]
     
  4. yellco89

    yellco89 Registered Member

    Joined:
    Mar 9, 2001
    Posts:
    13
    Likes Received:
    0
    Location:
    Arkansas
    I have the same problem, been told that the small wing that come factory on some Blazer/Jimmy's will stop the exhaust fumes due to redirecting the airflow over the top. That doesn't answer the soft-top question though.
     
  5. Confederate9

    Confederate9 1/2 ton status

    Joined:
    May 29, 2000
    Posts:
    1,686
    Likes Received:
    0
    Location:
    Greensboro NC
    that rear thing you are refering to i think is called either a "rear air dam" or a "rear spoiler"

    <A target="_blank" HREF=http://confederate9.coloradok5.com/>http://confederate9.coloradok5.com/</A>
    <font color=red>K5: Because size DOES matter</font color=red>
    [​IMG]
     
  6. pcorssmit

    pcorssmit 1/2 ton status

    Joined:
    Jan 2, 2001
    Posts:
    1,346
    Likes Received:
    0
    Location:
    Denver, CO
    I have the older style Kayline and a single tailpipe in the stock location on the right side (used to have duals). I get fumes with the rear side windows closed and the tailgate window open, but not with the rear side windows open. Pretty much like when the hard top is on.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  7. 4GUNZ4X4Z

    4GUNZ4X4Z 1/2 ton status

    Joined:
    Aug 10, 2000
    Posts:
    3,459
    Likes Received:
    0
    Location:
    Mustang, Oklahoma
    Man you guys are driven in style, I get fumes in the cab even with the window up. You lucky dogs.

    <font color=blue>Professional <font color=red>JEEP EATER</font color=red> it's a population control thing.</font color=blue>[​IMG]
     
  8. belly

    belly Registered Member

    Joined:
    Mar 10, 2001
    Posts:
    14
    Likes Received:
    0
    Location:
    Brisbane, Queensland, Australia
    I've got a single 3 inch dump pipe (on 45 degrees) behind the passenger rear wheel, when the back window is down I don't get any fumes, with dual pipes, exiting both out the back and sides it use to makes your eyes water!
     
  9. blackwidowk5

    blackwidowk5 1/2 ton status

    Joined:
    Dec 1, 2000
    Posts:
    107
    Likes Received:
    0
    Location:
    Richmond, Virginia
    Thanks for the help. I have duals by the way. But does anyone know about the soft top question?
     
  10. Hayduke

    Hayduke 1/2 ton status

    Joined:
    May 9, 2000
    Posts:
    271
    Likes Received:
    0
    Location:
    NE Columbus, Ohio
    the soft top will be just like the hard top if all you have removed or rolled up is the rear window, if you also remove the side windows there will be enough air flow to keep the fumes out.....but those chevy fumes are all part of having a K5.
    HAYDUKE

    Insured By COLT, Policy #.357M

    <A target="_blank" HREF=http://haydukesk5.coloradok5.com>http://haydukesk5.coloradok5.com</A>
     
  11. Topher

    Topher Registered Member

    Joined:
    May 12, 2000
    Posts:
    81
    Likes Received:
    0
    Location:
    North Texas (DFW)
    Blackwidowk5 - FYI with the Skyler soft top (that makes the truck look like a pickup) I get no fumes in the cab at all (unlike with the hard top on and tailgate window down).
     
  12. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    The factory sent the pipes out the side of most (all?) wagons, Blazers, Subs, SUVs, etc. that have rear passenger areas and rear openings (in particular opening windows). This is because when you push a box through the air, a low pressure area is created behind the box. In a vehicle, the exhaust will be pulled into this lower pressure area and into the passenger compartment. That is why rear exhaust is not good on these types of vehicles. Even with the window up, the pressure differential can pull in exhaust (including carbon monoxide) around the door/gate openings (have you checked the seals?). With a side exit exhaust, the bad stuff is carried away with the slip stream sliding by the vehicle. Even with the exhaust out the side, many vehicles come with a warning not to drive with the rear window open because of the potential for CO poisoning.

    The moral of the story? Most of the time, the factory actually did have a reason to do things the way they did. [​IMG] Just like all the clips that people leave off and then wonder why there wires and lines break. Anyway, I'm guessing that some people will point out factory options that violate this "out the side" rule but the facts and the physics remain valid.

    IMHO, you should run the exhaust out the side fore or aft of the rear tire for 2 reasons.
    1) It is less likely to get crushed closed on a rock
    2) Less danger from exhaust fumes.
    On an open truck, obviously 2 does not apply...


    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     

Share This Page