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Thread: Do they still make glasspacks like this? (pics)

  1. #1
    Registered User porkbun's Avatar
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    Default Do they still make glasspacks like this? (pics)

    Im replacing/refurbishing my Datsun Competition exhaust and im not sure I can replicate the exhaust sound. Old exhaust is rusting apart so I think its time to save what I can and replace what I dont think is worth the effort. Heres what the complete exhaust looks like:

    Click image for larger version. 

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    Then this happened
    Click image for larger version. 

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    Top glasspack broke off! Not only was the glasspack a 2in inlet to a 1.5in outlet(already impossible to find) but the interior looks completely different than the modern glasspacks.
    Modern:
    Click image for larger version. 

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    Original
    https://lh6.googleusercontent.com/-Q...o/IMG_1640.JPG

    Is there any way for me to get the hornets back in my car?
    Late 71' 240Z: HLS3040666

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    Nova Scotia,Canada,Earth Blue's Avatar
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    I just saw a Japanese Z website where they fabbed their own.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

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  3. #3
    Registered User madkaw's Avatar
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    Default

    Why are you stuck on 1.5" outlet? That's going to be hard to find alright.
    The interior looks like a typical glass pack that I've seen.
    My glasspacks have given out and the drone is back
    I'm going with magna flow 4" round mufflers with SS mesh construction - hopefully last longer then the 20$ glasspacks
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  4. #4
    Registered User porkbun's Avatar
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    Definitely going to hard to find if anyone anywhere still makes them but the sound was like nothing youve ever heard and sounds completely different than every other car on the road. 2" is the smallest I can find and they sound alright but theyre nothing special. Probably going have to learn how to weld so I can cut them up and get that sound back. Here are a couple more short vids. This one is with the complete exhaust (2 glasspacks, 2 resonator/glasspacks)



    And this is one with top glasspack broken off. You can hear how different it sounds at idle while the new glasspacks sound like the green 260Z
    Late 71' 240Z: HLS3040666

  5. #5
    Nova Scotia,Canada,Earth Blue's Avatar
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    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  6. #6
    Administrator bpilati's Avatar
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    I didn't think anyone still installed the twice-pipes exhaust system.
    Bryan Pilati
    1971 Datsun 240Z (8/71; 920 paint)
    IZCC #583; TZCC #16; CZC #110
    I'm never serious unless I should be.

  7. #7
    Registered User madkaw's Avatar
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    So what's so different about them besides the 1.5" outlet. Is the small outlet producing the sound you want? Then have someone just cut the ends off and weld on some 1.5" pipe.
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Registered User porkbun's Avatar
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    I didnt install it, im guessing it was installed back in the day at some dealership along with the Racer Brown cam aka "Slalom camshaft" in the comp. catalog. I know 2" is probably too big and true duals make less power but if its made it 43 years like this I dont really see a reason to change it (plus ive got power to spare ). I think the small outlet helps a bit but I think whats making that raspy noise is the interior of the glasspack. Ive still never seen anything like those fins inside. A big issue I noticed coming from the straight pipes is the resonance at about 2k and im not sure a homemade glasspack would help with that (or honestly how that works). I know a bunch of people probably think im crazy for wanting my car to sound like a bees nest but after a while you really start to like it. Magical fins?
    Click image for larger version. 

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    Late 71' 240Z: HLS3040666

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    That's an old Clifford Research system.

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    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  11. #11
    Registered User porkbun's Avatar
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    Yup I think its part 99996-E1045? I think the header is salvageable as its pretty thick and the pipes probably could be saved but I feel like that woud cost more than getting them replaced.
    "There were no true center resonators at all, but some drawings appear to show an additional pair of glasspacks in the pipes that go across the car just behind the rear suspension."
    This is the style I have on my car

    "It was possible to order a pair of straight pipes to replace the mufflers for competition use. (Race tracks had no dB limits back then. The sound must have glorious!)"
    You seriously need earplugs with straight pipes! After a 1/2 hour drive my ears were ringing and im sure my neighbors loved it. Ill try and get the videos off of facebook(theyre not public) on here but the camera cant do it any justice since you didnt just hear it, you felt it going by
    Late 71' 240Z: HLS3040666

  12. #12
    Registered User LeonV's Avatar
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    My 260Z sounded similar with a header and 2" twice pipes. Sounds quality isn't great but you get the gist...

    Nice Day for a Drive - Testing the Current Tune on the Z - YouTube
    2/74 260Z

  13. #13
    Registered User porkbun's Avatar
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    Hmmm. That does sound pretty similar and maybe if I double up those twice pipe glasspacks I can get that extra rasp. At higher rpms the sound was really harsh. Going to get my friend to upload another video
    Late 71' 240Z: HLS3040666

  14. #14
    Registered User LeonV's Avatar
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    What I'm saying is that you'll get a very similar, if not indiscernible from the original, sound if you just go to an exhaust shop and tell them to do two 2" pipes with 2 glasspacks in each pipe.
    2/74 260Z

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    My glasspacks just gave out and the drone is back
    Going with Magna flow 4" mufflers instead that are SS. I'm not much into the harsh raspy sound. I like my current Magna flow mufflers with the additional glasspacks. Before the packing gave out the sound was deep and rich. I'm hoping the SS mufflers last longer and quiet things down.
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  16. #16
    Registered User porkbun's Avatar
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    Quote Originally Posted by LeonV View Post
    What I'm saying is that you'll get a very similar, if not indiscernible from the original, sound if you just go to an exhaust shop and tell them to do two 2" pipes with 2 glasspacks in each pipe.
    Im hoping this is the ticket! My temporary pipes right now are thrush glasspacks and theres not really any rasp at all so ill try my hands at a different brand and double them up. Ill figure it all out with some exhaust shops but I was just making sure there isnt some secret supply of tiny glasspacks with fins in them that I didnt know about
    Late 71' 240Z: HLS3040666

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    Registered User 2sixTZombii's Avatar
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    Love the sound of your Z, I'll be curious what you end using and how it sounds. I plan to have a shop here in town build me a custom exhaust system in a couple months, and trying to gather info.
    1974 early 260z, Weber DGVs killed my motor.....

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