MGB & GT Forum
Why does an MGB 1800 engine sound so throaty?
Posted by hrragen
Topic Creator (OP)
Apr 30, 2016 12:19 PM
Joined 9 years ago
195 Posts
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I had people ask me that regularly. My exhaust is not stock but besides being minus the front silencer and 1.75 dia. Its nothing special. Does not sound alot different from when it was stock. Don't really have an answer when asked. Nature of the beast?
Apr 30, 2016 12:24 PM
Top Contributor
Joined 9 years ago
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HiPowerShooter
James Booker
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Apr 30, 2016 12:24 PM
Joined 9 years ago
7,787 Posts
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Probably just the fact it's got a short run and the OEM exhaust manifold was very well designed for good flow.
"One test is worth a thousand expert opinions"--Alvin "Tex" Johnston...Boeing test pilot.
"Who do you think you are? I am."...Pete Weber
73 MGB. Tires: Round, black, hold air. Oil: Sometimes old, sometimes new...always slippery. Oil filter: Yellow, usually full of oil. Carbs: 2 SU HIF. Distributor: Yes. Headlights: Not that bright but bright enough. A bunch of other stuff most cars have but not really important enough to itemize. Oh, wait...it has a cool sounding exhaust with stickers on the chrome tips. Really slays the ladies...
"One test is worth a thousand expert opinions"--Alvin "Tex" Johnston...Boeing test pilot.
"Who do you think you are? I am."...Pete Weber
73 MGB. Tires: Round, black, hold air. Oil: Sometimes old, sometimes new...always slippery. Oil filter: Yellow, usually full of oil. Carbs: 2 SU HIF. Distributor: Yes. Headlights: Not that bright but bright enough. A bunch of other stuff most cars have but not really important enough to itemize. Oh, wait...it has a cool sounding exhaust with stickers on the chrome tips. Really slays the ladies...
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Apr 30, 2016 12:40 PM
Joined 8 years ago
2,645 Posts
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Apr 30, 2016 02:56 PM
Joined 9 years ago
1,442 Posts
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It's a mixture of intake roar and exhaust resonance. OEMs spend a lot of time quietening modern cars to meet noise regulations and most modern cars are bland as a result of this. Some now add it back in synthetical. Fortunately our cars are not handicapped by these regs.
Steve S.
Stephen Strange
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Apr 30, 2016 03:00 PM
Top Contributor
Joined 16 years ago
3,132 Posts
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Dave-
The function of the front muffler is to dampen bass note frequencies, while that of the rear muffler is to dampen the higher frequencies that give the exhaust note a rasping tenor. Unless a rear muffler that is designed to do both is fitted, remove the front muffler and you get the throaty sound. It's that simple.
The function of the front muffler is to dampen bass note frequencies, while that of the rear muffler is to dampen the higher frequencies that give the exhaust note a rasping tenor. Unless a rear muffler that is designed to do both is fitted, remove the front muffler and you get the throaty sound. It's that simple.
Apr 30, 2016 03:46 PM
Joined 9 years ago
1,442 Posts
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The exhausts on modern cars are a lot more sophisticated. Some contain resonators and servo operated valves that can switch them in and out as required. At least one OEM has a speaker in the back section on the exhaust system to allow them to make the car sound sporty!
HiPowerShooter
James Booker
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Apr 30, 2016 04:53 PM
Joined 9 years ago
7,787 Posts
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I know what makes mine sound like it's got a pair...
Still haven't figured out what the fascination with "fart can" mufflers are.
I'd like to be able to retro-fit an Ansa onto my new Subaru Legacy sedans dual pipes...
"One test is worth a thousand expert opinions"--Alvin "Tex" Johnston...Boeing test pilot.
"Who do you think you are? I am."...Pete Weber
73 MGB. Tires: Round, black, hold air. Oil: Sometimes old, sometimes new...always slippery. Oil filter: Yellow, usually full of oil. Carbs: 2 SU HIF. Distributor: Yes. Headlights: Not that bright but bright enough. A bunch of other stuff most cars have but not really important enough to itemize. Oh, wait...it has a cool sounding exhaust with stickers on the chrome tips. Really slays the ladies...
Still haven't figured out what the fascination with "fart can" mufflers are.
I'd like to be able to retro-fit an Ansa onto my new Subaru Legacy sedans dual pipes...
"One test is worth a thousand expert opinions"--Alvin "Tex" Johnston...Boeing test pilot.
"Who do you think you are? I am."...Pete Weber
73 MGB. Tires: Round, black, hold air. Oil: Sometimes old, sometimes new...always slippery. Oil filter: Yellow, usually full of oil. Carbs: 2 SU HIF. Distributor: Yes. Headlights: Not that bright but bright enough. A bunch of other stuff most cars have but not really important enough to itemize. Oh, wait...it has a cool sounding exhaust with stickers on the chrome tips. Really slays the ladies...
Apr 30, 2016 04:58 PM
Top Contributor
Joined 14 years ago
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Apr 30, 2016 08:22 PM
Joined 9 years ago
172 Posts
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Apr 30, 2016 08:56 PM
Joined 7 years ago
249 Posts
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Apr 30, 2016 11:08 PM
Joined 7 years ago
153 Posts
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In reply to # 3253641 by circeonya
I think the long stroke has a lot to do with it. Modern oversquare engines are harder to get a decent note.
Yes, I think this too. Small dia. bore to stroke make for good ag engine also. Ag engine at steady rpms and not discernable as "throaty" as from a sports car.
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May 1, 2016 09:59 AM
Joined 8 years ago
2,645 Posts
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May 1, 2016 12:23 PM
Joined 23 years ago
1,710 Posts
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The exhaust system for a B was the single piece Abarth system. Abarth isn't available anymore unfortunately. A few years ago somebody had a few old stock Abarth systems and I really wished I had picked one up at at the team even with my car in a perpetual state of rebuild..... Nothing like the rumble of an Abarth on an MGB.
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