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  • Exhaust scraping

    Hello!
    I searched around a bit here and other sites about my exhaust scraping. Its usually at the end of entrances to driveways, pulling out of lots with raised aprons, etc. I have to crawl until I'm onto the roadway and leveled out. I have the Monza exhaust on my car. I am wondering if I should just change out the exhaust or is my car possibly in need of new rear springs. I am going to be taking apart my trailing arms to re-bush, check out the mounts (prob replace while I'm there with adjustable), shocks, etc...I am trying to determine if my springs are maybe not a s stiff or just plain worn out at this point. They look original to me. I was contemplating trying standard new springs to see if the body height increases enough to help. I realize the car is low and I need to be careful.
    Thanks!
    Mark

  • #2
    I had Monza exhaust for many years and it scraped. I eventually pulled the rear seam loose on the cans on a driveway edge and decided to replace it with my current custom system.

    Any low TR6 is going to scrape with many aftermarket systems. The stock system is not nearly as bad about this because of the orientation of the muffler.

    IMO this is not a function of springs as much as it is a function of muffler configuration, ride height and driving.

    FWIW, my current system will scrape if I'm not deliberate in driving into/out of some drives. I approach many at an angle and this helps immensely.
    1973 TR6 – BRG with beige interior, custom LED lighting
    Hardtop, OD, Rollbar, 15”Koenigs
    Bored, balanced and polished motor with Kastner/TSI S2 Cam
    Header, custom exhaust, custom alternator, e-fan
    Lowered, poly suspension, Konis and rear anti roll-bar
    www.coventrysfinest.blogspot.com

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    • #3
      Karter,
      Thats what I do. I have to angle the approach very slow. I may switch to a stainless exhaust system in the future anyway. I wanted to see if this might be an exhaust system problem or my ride height is too low.
      Thank you
      Mark

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      • #4
        The stock exhaust tucks the muffler up parallel to the axle to get it higher for more clearance.
        I72 Pimento w/overdrive

        Comment


        • MARKRL
          MARKRL commented
          Editing a comment
          I'm thinking about going stock at some point..the cheapness factor in me is saying "your exhaust is still good..think of what else you could do with the money..." but I really hate when the thing scrapes even a little bit!

      • #5
        Hi Mark,

        I'm pretty new to my TR6, only a few months and less than 2,000 miles, but I've had no issues at all with the Monza exhaust on my 1974 car. It does hang a couple inches below the rest of the undercarriage, but it's not been an issue for me. Maybe there are differences in the way they have been hung?

        I've attached a photo, hopefully in a way that is clear.


        Jeff
        1974 CF20173U White with Shadow Blue interior. Unrestored survivor.
        Weber DGV 32/36 carbs, Monza exhaust.
        Located in Ontario, Canada
        Original owner: the late Karl Mueller of Shreveport, LA

        Comment


        • SapphireBlue72
          SapphireBlue72 commented
          Editing a comment
          On the rear, bottom seam both muffler cans appear to have lightly scraped at one time. Not too serious, yet.

        • Jeff_Masala
          Jeff_Masala commented
          Editing a comment
          SapphireBlue72, thanks for pointing out the scrapes, I had not noticed them. LOL. I went had a closer look, and I think they're old, from the PO. I'm pretty sure I've not scraped them, but thanks for pointing out that it is possible. I will continue to be careful about that.

      • #6
        Jeff,
        Yours looks tucked up a bit more near the diff. I may have to re-evaluate my system before I go for a new one or change out my ride height. The rear suspension is s getting dismantled this winter so then I'll be able to see whats going on better. Thank you for the picture and good luck with your car!! See you here soon!

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        • #7
          I used to have a Monza system and lowered Moss competition springs and never had issue with it scraping

          I think as others have mentioned you might be able to position the tips up a bit higher.

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          • #8
            My MOnza scraped to the point they would come apart at the seams. I put in new rear springs, 1" lowered HD from BPNW. No more scraping. Then I got tired of the sound and went stock.
            1972 Sapphire TR6 #CC84,something

            1959 Red TR3 (Wife's)

            Comment


            • MARKRL
              MARKRL commented
              Editing a comment
              skootch,
              You lowered the car and the scraping stopped?

            • skootch13
              skootch13 commented
              Editing a comment
              That is correct. After the pipes came apart the second time I got the springs. The Monza mufflers were tucked as high as they could go too.

          • #9
            Sorry for not being here sooner with my reply. I don't think I'm understanding how lowering the car would stop the mufflers from scraping. I'm trying to look at my car and picture how this would work. I do think I need to re-route the mountings though. I guess the thought was to raise the car a bit to get the mufflers higher.

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            • #10
              My old stock springs were worn out. Yours are too. Put in new springs,lowered, stock, whatever, and they won't scrape any more.
              1972 Sapphire TR6 #CC84,something

              1959 Red TR3 (Wife's)

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              • #11
                skootch,
                I'm thinking changing the springs is a good thing regardless. I also think that I'll be going to stock/stainless at some point anyway. I'm sure the springs are the originals.

                Comment


                • #12
                  My 75 TR6 has the Monza exhaust with a tubular header, it’s never scraped at all. It’s tucked up tight with what looks like custom made brackets at the rear with the end pipes a paper thickness from the lower valence. Don’t mind the sound that much, seems pretty quiet after driving the Fuelie Corvette with side pipes!

                  Comment


                  • #13
                    Mine definitely hang lower than that. I'm thinking new springs, new mounts(or new stock system) and in the spring I'll be good to go.

                    Comment

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