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Join Date: Aug 2012
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SSI's = more distinct valve noise
I recently had the engine out, adjusted the valves (my first time doing it on a 911) and added SSI's, with an M&K 2 in 2 out. While running, with the engine lid up, it seems like I was hearing a bit more valve noise than normal. And the noise seemed to be dissimiliar when comparing the passenger side to the driver side of the engine, by ear.
Anyone notice differences when adding SSI's, etc.? perhaps a bit more noise? I am trying to delineate is this a valve adjustment issue, or a SSI issue? When I adjusted the valves, I went through them all with the 4 /1000ths feeler, and then triple checked everything. Thoughts on this? I have to say I am impressed by anyone who can do this while the engine is in the car!!
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J 911 SC - 1980 911 S - 1977 |
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Recreational Mechanic
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I noticed more valve noise for sure when I put my SSIs in. It was really bad with my Dansk 2-in/2-out muffler under hard acceleration. I took that muffler off and went back to a stock 2-in/1-out and it was much better.
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P Cars: 2022 Macan GTS / One empty garage space ---- Other cars: 2019 Golf R 6MT / 2021 F-250 Diesel / 2024 Toyota GR86 6MT ---- Gone: 1997 Spec Boxster Race Car, 2020 GT4, 2004 GT3, 2003 Carrera, 1982 911SC, 2005 Lotus Elise and lots of other non-Porsches PCA National DE Instructor #202106053 / PCA Club Racing / WRL Endurance Racing |
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Thanks - I am also thinking about the noise factor... I like it, but the drone is a bit tough, and I would like to be able to bring the kids along occasionally... right now... I don't think they would do well with the sound
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J 911 SC - 1980 911 S - 1977 |
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Location: Marysville Wa.
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that drone is the muffler, not the exchangers.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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When I installed my SSI's and Dansk 2in/1out muffler, accelerating on the highway with my window down and Jersey Barrier on the left, I could hear what sounded like my valves out of adjustment. I found out that it was the seal between the SSI's and muffler. They usually aren't very good and you are hearing an exhaust leak. I ended up using a little muffler paste between the gasket and the flange and re-torquing everything back together. Noise gone.
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'81 924 , '85 944 , '78 911SC , '82 928 5.0L "They run best being run close to the ‘limit’ and done so regularly" - Grady |
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Location: venice ca
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if that was your first time adjusting the valves, you most likely left them loose.
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Jason 81 SC 97 328is 87 Jeep Comanche (RIP) |
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Eva
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yeah, that was my concern.... It's going to be a nightmare to adjust with the engine in... anyone do this successfully without draining the oil?
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J 911 SC - 1980 911 S - 1977 |
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Yes if you jack the car up on one side the exhaust valves can be checked. Check the intakes first as you don't need to drain the oil. Valves aren't hard to access if you don't have all that plumbing stuff in the engine bay!
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'81 924 , '85 944 , '78 911SC , '82 928 5.0L "They run best being run close to the ‘limit’ and done so regularly" - Grady |
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Speed Dog's Chauffeur
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SSI Valve Sound
My last 3.0 (1980) had the stock heat exchangers so my 83 euro 3.0 with SSI & Dansk 2in/1out (SS stock type) has the sound like the valves may be loose at idle RPM. This may explain my own concern about my valve lash. However, I did notice a lot better pulses coming out and a nice soft rumble at idle with the SSI. You may not be alone but I have to wait for the oil change & valve adjustment to be sure. Side Bar: I get a small drone exhaust tone under load in the 2500 to 3000 range but nothing severe. If you want the special valve adjusting tool, Stomski makes the SR097 (add your own dial indicator) that you should be able to get through Pelican. I do not know if it fits in car applications like the 0.004 inch feeler gages. Maybe your lash verification could do a lot of explaining about "valve noises" for the SSI crowd. Best of Luck.
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Thanks for the help and suggestions. Here is what I found.
It was a lot easier to get at the topside valves than I imagined. I focussed on intake valves 1,2, and 3 since I could at least check those without jacking the car up, or removing the A/C, and that's where it sounded like the most valve noise was coming from. Valves 2 and 3 were probably at 6-7 thousandths (guessing).... not sure why... but I tightened them to 4 thousandths, and put the valve cover back on. I checked the manifold torque as well, and found one nut on cylinder 5 was not even seated. I tightened it down snug, and rechecked the manifold to muffler bolts as well. They were pretty loose as well, so retorqued them. Took it for a drive to get coffee.... sunny day, but cold, here in Seattle....no traffic, moon roof open, fantastic !!!
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J 911 SC - 1980 911 S - 1977 |
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Speed Dog's Chauffeur
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Thanks
Thanks. Now I need to get busy adjusting valves & changing oil.
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