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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,765
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Interesting exhaust system
Not a 911, but in fact still a flat 6, A Cayman GT4CS was iin the shop for a fuel cell bladder replacement... ( a whole nuther story)
While up in the air I noticed some really interesting thing in the exhaust dept... Though a flat 6, each bank had a 4 into 1 collector... and one capped off pipe about the same length as the 3 "live" pipes...Think this has something to do with tuning exhaust pulse, or something like that... Have never seen anything like this... I'm just a retired engineer.. and still learning everyday.. I thought this was interesting.. We're not sure if these headers were installed by Porsche or some other entity.. Passenger side  Drivers  And even though it s a racecar........ You can turn 55 second laps at Lime Rock, or 1:53 at the Glen in comfort.. the car has A/C... And As if ABS isn't enough.. it has 11strategies for the ABS system... (the chart on the center console) Wasn't sure where to post this and get any traction. 
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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03-20-2025, 01:54 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,765
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BTW the rest of the exhaust was just 2 out straight pipes..
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Don't feed the trolls. Don't quote the trolls http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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03-20-2025, 01:58 PM
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PCA Member since 1988
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Interesting. I've seen resonator chambers on the intake, but not on the exhaust.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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03-20-2025, 10:38 PM
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(man/dude)
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That's really odd. Somebody must know something, though, you wouldn't do that just for fun. The fact that it doesn't have mufflers (but presumably still meets sound requirements) is telling.
To my mind adding a Heimholz resonator to a collector seems an odd choice, seeing as how there are useful pulses that you need for scavenging and would not want to dampen. Unless it's designed to amplify them?
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Heavy Metal! Part Deux - The Carbon Copy Project Heavy Metal https://tinyurl.com/57zwayzw (SOLD) 85 Coupe - The Rot Rod! AX beater Quality Carbon Fiber Parts for Classic 911s: instagram.com/jonny_rotten_911 |
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03-21-2025, 05:03 AM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,697
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It's an interesting question whether it meets sound req's. In our area there is a mix of sound restricted and (relatively) unrestricted tracks. A few that have either no limit, or 103 db, for example.
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03-21-2025, 08:50 AM
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J042 got it right, those are Helmholtz resonators, I've seen them on muffled systems but never on open. Maybe they are leftover from a muffled system that was removed
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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03-21-2025, 11:35 AM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,765
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The way the car came to the shop was with open pipes... It does have other options (mufflers) for tracks like Lime Rock...
I had just never seen this solution implemented...Its got nice 4-1 collectors (a pair, and on a 6 cylinder engine)...and a really well made set of headers... I looked but couldn't find any identifiers of them..
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Don't feed the trolls. Don't quote the trolls http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others Last edited by TimT; 03-21-2025 at 12:37 PM.. |
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03-21-2025, 12:28 PM
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I love the functional details that racecars end up with out of necessity. Like the little gearbox for the brake bias knob.
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Heavy Metal! Part Deux - The Carbon Copy Project Heavy Metal https://tinyurl.com/57zwayzw (SOLD) 85 Coupe - The Rot Rod! AX beater Quality Carbon Fiber Parts for Classic 911s: instagram.com/jonny_rotten_911 |
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03-22-2025, 12:44 PM
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It's certainly not stock
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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03-22-2025, 02:08 PM
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Registered
Join Date: Mar 2010
Location: Socal
Posts: 2,384
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Quote:
If it’s just for display you can now buy knobs with a screen built-in . |
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03-23-2025, 10:05 AM
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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03-23-2025, 02:47 PM
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Registered
Join Date: Mar 2010
Location: Socal
Posts: 2,384
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Yes , and here’s one in my garage …
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03-23-2025, 05:49 PM
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1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
