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H-pipes

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by muddin4fun, Mar 7, 2001.

  1. muddin4fun

    muddin4fun 3/4 ton status

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    How do you know where to put an H-pipe? I heard you have to tune them, but I don't have a clue.

    [​IMG] Keep your feet dry [​IMG]
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  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    I was told by a rep from Flowmaster that really seemed to know his sh!t, that you get the dual exhaust completely installed. Then paint the pipes(from after the manifolds tothe muffler) with some spray paint and take the vehicle for a drive. I dont htink you have to take it for a long drive, just enough to get the pipes hot enought o burn the paint. Then, where ever the paint burns off, install the H-pipe there.
    I guess the ehaust fume will travel through the pipe and then some will travel back through towards the engine. Whne it travels back through, this will create the burn spot/hot spot on the paint. That is where you want the H-pipe to let the gases flow smoother.

    A lot of people just say, "Ah, put it close to the engine!", but this guy we talked to really seem to get into and acted like it was a science!(which it probably is)

    HTH

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
    <P ID="edit"><FONT SIZE=-1>Edited by Emmettology 101 on 03/07/01 08:19 AM (server time).</FONT></P>
     
  3. wayne

    wayne 3/4 ton status

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    I never heard of that before but it does sound logical. I was always told to try and keep it within 24 inch of the collectors if you are running headers.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails[​IMG]</font color=blue>
    <font color=blue>Wayne</font color=blue>
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    Most guys i talked to about it(even some other flowmaster guys) just say palce it as close as possible to the engine.

    But I talked to this guy about 2 years ago and he was amazing! He went into suc depth and detail!! He really knew his stuff and seem very happy to take his time to help us. The others just seem to brush you off.
    This guy had a british or similar accent and was very nice, if you ever call Flowmaster for help i would ask for him.
    Unfortunately, i forgot his name.

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    Ahh dumb question but Why would you want to even mess with connecting the two pipes together? Smog? Torque?
    I have seen that pipe dropping down around the front drive shaft and it seams to me it's in the way and to intentionally put one on?? Anyone know the theroy?

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    This will add some HP and Torque.....

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  7. Blue85b

    Blue85b Registered Member

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    The idea of looking for the "hotspot" is valid, but with a 4WD, you are normally going to find that the ideal spot for the H-pipe is under your transmission or transfer case. Since you don't want to put it there, you'll just end up putting it wherever you can find to fit it anyway, so the science is sometimes only good in theory.

    I put mine just underneath the tailshaft of the transfer case. It would function better closer to engine, but again, it would be hitting the front driveshaft (bad) or a big, wide "U" underneath the cross member (terrible). I don't really know if it helps me out in this location, but it does fit fairly well (good), doesn't cause any clearance issues (also good) and I talked the shop into doing it for no extra charge (very good).

    A word of advice when putting in an H-pipe: make it removeable. You can get those diamond-shaped clamp-together plates at any muffler shop and fabricate a disconnect on each end of the pipe. Then you get some spare covers that bolt on in place of the H-pipe and you can even run without it. With a full dual exhast with H-pipe, welded together from manifolds/headers to tips, there is no way to get it out of the way to take out your transfer case or transmission...ask me how I know.
     
  8. muddin4fun

    muddin4fun 3/4 ton status

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    Good point!!! Very good point!! I will definatly do that if I add one.

    [​IMG] Keep your feet dry [​IMG]
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