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Thread: 355 sbc question about exhaust sound (need some help here!)
          
   
   

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  1. #1
    Tie-355's Avatar
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    Another Chance

     



    After cooling off a little im gonna give this another chance. comment that has all the info on it is on page 5 with a link in it.
    Last edited by Tie-355; 01-04-2016 at 11:09 PM.

  2. #2
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    I didn't hear anything bad.. but, the video is at the wrong end of the car!

    OH, welcome to CHR too. Good to see you here and hope you enjoy the site and the folks.

    Your profile shows New York. the plates show Canada...
    Last edited by 34_40; 01-02-2016 at 03:39 AM.
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  3. #3
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    I agree with Mike, put your camera/mike up front, focused on the engine. The exhaust sounds OK with a healthy idle, but the exhaust note drowns out any engine sounds that might point to problems. Also, after your 45 second clip it rolls into a longer clip about a red '82 which is a different car, right?

    Welcome to CHR.
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    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  4. #4
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    Sounds good to me, but since you don't know much about the internals I think I'd keep the shift point at 5 grand or below.
    DA34GUY, Matthyj and Tie-355 like this.
    Ken Thomas
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  5. #5
    36 sedan's Avatar
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    Welcome
    JMHO, it sounds like back pressure, possibly a leaky exhaust gasket/joint, or a loose muffler baffle..
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  6. #6
    DennyW is offline CHR Member Visit my Photo Gallery
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    36-sedan...That's funny...

    Like NTFDAY says, sounds good.

    Engine sounds sound enough. Even on the banks, nice lope, and has good response. Sounds healthy... Pipes look fair as cylinder burn goes. A hair on the rich side, but that is ok.
    As far as the rpm's to go to...well, you need to go until just before the pull stops, and grab another gear. Winding out as far as it will go, is not to your benefit. I would say 5000 rpm's is about it from the cam I hear in there. Shift before it runs out of pull (steam), otherwise you are just plain wearing it out, and have a chance of blowing it... If you can, find out the exact cam that was installed, and then look it up, and check, when the power curve tops out.
    Ken has it, keep it at 5000, and don't push it.

    rspears, youtube does that on videos...They go to the next one in the list automatically.

    ps: Aytime you run it up past the safe rpm zone, you now put it in the go or blow mode...You only do that if---you have a lot of cash bet on the win...
    Last edited by DennyW; 01-02-2016 at 07:37 AM.
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  7. #7
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    Glad you enjoyed Denny,
    Maybe just my ears, but I'm hearing a rattle on the reversion...

  8. #8
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    JMHO, but I think that what you're hearing is harmonics and the baffling in the mufflers.
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    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

  9. #9
    DennyW is offline CHR Member Visit my Photo Gallery
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    Quote Originally Posted by 36 sedan View Post
    Glad you enjoyed Denny,
    Maybe just my ears, but I'm hearing a rattle on the reversion...
    If it had an exhaust leak at the manifolds, it would usually have some popping going on. Or one side would have a different tone to it. I hear no rattle type noise. Sounds like just good old tone harmonics, Think trombone on a low note... like back in the day so to speak. I even downloaded his recording, amplified it, and could not hear any rattle, or exhaust problem. Just dual muffler tone harmonics...

  10. #10
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    Quote Originally Posted by Tie-355 View Post
    But the question i have is If the car should sound the way it does when reved to around 5000 rpm.
    As the above question asks,
    To me it sounds like a little back pressure as it comes off throttle, it doesn't mean a bad thing. However, my old ears hear a slight rattle at reversion. Thus the suggestion to check for a loose baffle and/or small exhaust leak, both of which are easy to do.
    Not trying to be funny, certainly no disrespect intended, and it may just be harmonics as suggested...
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  11. #11
    DennyW is offline CHR Member Visit my Photo Gallery
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    Quote Originally Posted by 36 sedan View Post
    As the above question asks,
    To me it sounds like a little back pressure as it comes off throttle, it doesn't mean a bad thing. However, my old ears hear a slight rattle at reversion. Thus the suggestion to check for a loose baffle and/or small exhaust leak, both of which are easy to do.
    Not trying to be funny, certainly no disrespect intended, and it may just be harmonics as suggested...
    I'm sorry, I didn't add the smilies to indicate I was making fun of anything or anyone. I added them to show I wasn't trying to offend anyone. Just 2 guys smiling, and talking. That back pressure happens when the throttle gets shut down. It's actually trying to draw more but can't.
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  12. #12
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    And I believe that resonators behind the mufflers would probably cancel some of it out though I sure wouldn't want to do that.
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

  13. #13
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    Quote Originally Posted by 34_40 View Post
    I didn't hear anything bad.. but, the video is at the wrong end of the car!

    OH, welcome to CHR too. Good to see you here and hope you enjoy the site and the folks.

    Your profile shows New York. the plates show Canada...
    K thank for the reply I would get a another vid of the engine bay while it was running but it is tucked away for the winter because we got a couple feet of snow here lol. and as for the fact ti says new york when it asked for where i was it said sate and there aren't states here in canada..................

  14. #14
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    Quote Originally Posted by DennyW View Post
    36-sedan...That's funny...

    Like NTFDAY says, sounds good.

    Engine sounds sound enough. Even on the banks, nice lope, and has good response. Sounds healthy... Pipes look fair as cylinder burn goes. A hair on the rich side, but that is ok.
    As far as the rpm's to go to...well, you need to go until just before the pull stops, and grab another gear. Winding out as far as it will go, is not to your benefit. I would say 5000 rpm's is about it from the cam I hear in there. Shift before it runs out of pull (steam), otherwise you are just plain wearing it out, and have a chance of blowing it... If you can, find out the exact cam that was installed, and then look it up, and check, when the power curve tops out.
    Ken has it, keep it at 5000, and don't push it.

    rspears, youtube does that on videos...They go to the next one in the list automatically.

    ps: Aytime you run it up past the safe rpm zone, you now put it in the go or blow mode...You only do that if---you have a lot of cash bet on the win...
    K thanks that is what i thought for shift points rpm wise. The power curve feels like it peaks between 5000 and 5300 because around 5500 you can feel/hear it lose some power so thats why i kept my shift points around that 5000 - 5300 mark. As for the cam i will never know any of the internals unless i pull it apart and seeing as i dont trust myself pulling apart a $10,000 motor just yet i don't think i will know for a while. (its one thing if its a shitty honda motor i got for free lol!)
    Last edited by Tie-355; 01-02-2016 at 09:57 AM.

  15. #15
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    Quote Originally Posted by 36 sedan View Post
    Welcome
    JMHO, it sounds like back pressure, possibly a leaky exhaust gasket/joint, or a loose muffler baffle..
    Im surprised you could hear that in the vid!!! The front right header comes a little lose on its own every so often so i need to tighten it once every 1 or 2 weeks until i can afford to buy 2 new hooker headers.

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