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Straight pipe question

Discussion in '2nd Gen. Tacomas (2005-2015)' started by BlueTaco07, Jan 6, 2012.

  1. Jan 6, 2012 at 8:48 PM
    #1
    BlueTaco07

    BlueTaco07 [OP] Super Mod!

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    So someone tells me today that I can burn a valve by running straight pipes? Is that true? I have my rear cats deleted then a muffler delete with a Y-pipe to duals. Everythings welded so is this bad for the engine?
     
  2. Jan 6, 2012 at 8:49 PM
    #2
    Forster46

    Forster46 Very nice how much?

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    Lets hear it!
     
  3. Jan 6, 2012 at 8:50 PM
    #3
    tacobo670

    tacobo670 if you have to ask, u can't afford it

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    i dont see how. if anything u might loose power due to some loss of backpressure. imo.
     
  4. Jan 6, 2012 at 8:54 PM
    #4
    BlueTaco07

    BlueTaco07 [OP] Super Mod!

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    No damage to the valves though correct?
     
  5. Jan 6, 2012 at 8:54 PM
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    tacobo670

    tacobo670 if you have to ask, u can't afford it

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  6. Jan 6, 2012 at 8:54 PM
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    BlueTaco07

    BlueTaco07 [OP] Super Mod!

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    Hold on I gotta leave my hood so i dont piss my neighbors off :D
     
  7. Jan 6, 2012 at 8:55 PM
    #7
    tacobo670

    tacobo670 if you have to ask, u can't afford it

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    that nite was epic.
     
  8. Jan 6, 2012 at 9:21 PM
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    BAMFTACO

    BAMFTACO Pabst Blue Ribbon on ice

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    Op I have heard this before but i forgot what the reason was not sure if it's true or not I would like to know as well
     
  9. Jan 6, 2012 at 9:25 PM
    #9
    Forster46

    Forster46 Very nice how much?

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    Lol wouldn't you piss them off just leaving your house?
     
  10. Jan 6, 2012 at 9:26 PM
    #10
    dYL0n

    dYL0n ระดับอาวุโส สมาชิกอาวุโส

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    I've never heard of damage to valves due to straight pipes. The exhaust gases leaving the manifold with less restriction should result in cooler operating temps, so i would assume; no valve damage.
     
  11. Jan 6, 2012 at 9:34 PM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    You wont burn any valves, but you are screwing up the inherant exaust scavenging design of the existing system, so you will loose power.
     
  12. Jan 6, 2012 at 9:38 PM
    #12
    dYL0n

    dYL0n ระดับอาวุโส สมาชิกอาวุโส

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    Toyota engineers designed your exhaust system for power/mpg. Leave it alone.
     
  13. Jan 6, 2012 at 9:41 PM
    #13
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    that too.....
     
  14. Jan 6, 2012 at 10:08 PM
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    BlueTaco07

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    My trucks already straight piped.
     
  15. Jan 6, 2012 at 10:08 PM
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    tacobo670

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    <<<<< i heard that guy said it too, no power!! hey macfly, hoverboards dont work on water!!
     
  16. Jan 6, 2012 at 11:33 PM
    #16
    Bosmob

    Bosmob Well-Known Member

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    The only way you could really "burn" a valve due to an exhaust system is by running some zoomies/open manifolds/open headers.

    When I say "burn" I mean after you shut the motor off, cool air can enter through whatever exhaust system is on your truck and crack valves due to the valves heat cycling too quickly.
     
  17. Jan 7, 2012 at 12:00 AM
    #17
    KAWAIANIANI

    KAWAIANIANI Well-Known Member

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    (warp and crack)


    x2
     
  18. Jan 8, 2012 at 6:27 PM
    #18
    Bobber Bill

    Bobber Bill Well-Known Member

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    The problem with valves when running straight pipes is not from change in back pressure or scavenging. This is a commonly talked about occurrence with motorcycles.

    The valve issue is a result of the exhaust system/head cooling after its been up to temp. True straight pipe exhausts are just that, straight pipe. There are no cat cores, baffles, wool or fiberglass packing between the open tip and your exhaust valves.

    Imagine what might happen to your valves once you park your vehicle and shut it off for a cold evening - with nothing but air between them and the cold, moist evening/morning air.

    Rapid uneven cooling can lead to unwanted changes in valve tolerances. Condensation build up on steel valves can lead to corrosion and binding. If either of these things happen, you'll drop/break a valve and have to replace pistons, valves, bore/re-hone your cylinders etc... That's if you're lucky enough to avoid screwing up a crank bearing or blowing a hole through your motor.
     
  19. Jan 8, 2012 at 6:30 PM
    #19
    Bobber Bill

    Bobber Bill Well-Known Member

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    Also, any partially open valves will let the same damage occur to intake valves, pistons, piston rings and cylinder walls.

    Food for thought
     
  20. Jan 8, 2012 at 7:01 PM
    #20
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    This is an old mechanics tale based on miss information. First, the valves cool from the seat. Valves are heat tempered, and dont expand/contract to the same degree other metal parts do. Being the exhaust system runs between 1200 and 1500* when driving normally, and can get as high (safely) as 1800/1900* when under load, a 40* change in ambient temps (shuting off vehicle on a cold night after a day of driving) isnt going to cause any issues. Consider that back in teh 'ol days of flight, radial engines ran the exhaust right out of the head. These engines mostly suffered oil starvation issues, rather than burned valves. Valves that were found burned, were mostly found burned due to poor fueling, or timing. As for the
    You do realize that valves stay where they are supposed to be in the timing cycle when the engine is stopped, right?
     
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