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Exhaust Manifold Heat Duct 69 AMX 343. |
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sfisher1975 
AMC Fan 
Joined: Apr/04/2017 Location: Pittsburgh Status: Offline Points: 16 |
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 Topic: Exhaust Manifold Heat Duct 69 AMX 343.Posted: Aug/12/2017 at 2:42pm |
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Can someone please explain to me how the Exhaust Manifold Heat Duct and why it's there? I'm courious as to why... Thanks much
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scott
AMC Addicted 
Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3502 |
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Posted: Aug/14/2017 at 4:43pm |
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When the engine is cold, the door in the air cleaner snorkle is closed. The air gets sucked over the hot exhaust manifold & the air is heated, goes up the heat duct, thru the snorkle, into the carb. This helps the engine to warm up quicker, eliminates carb icing in really cold conditions, & cleans up emissions on startup.
Once the thermostatic spring in the snorkle warms up, it opens the door in the snorkle & the engine breathes under hood temp air. Where are you in Pittsburgh?? I'm about 15 miles north of town. There are a few other AMC owners around. |
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sfisher1975
AMC Fan
Joined: Apr/04/2017 Location: Pittsburgh Status: Offline Points: 16 |
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Posted: Aug/14/2017 at 5:24pm |
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Sounds simple enough... When i hear thermostatic spring i always think..... Not going to work.. Only because the choke never does. Iwould leave it off but is a heck of a conversation peice... Haha.. South hills of Pittsburgh so not all that far from ya.
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ramblinrev
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Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11543 |
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Posted: Aug/14/2017 at 5:36pm |
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If you have a good 'stove pipe' and air cleaner with snorkel, hang onto it. Many of these were thrown away over time, and these are getting harder to find.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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401MATCOUPE
AMC Addicted
Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Posted: Aug/14/2017 at 5:51pm |
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I used to cruise South Park (not the TV show) with my 68 AMX back in the 80's and lived in Clairton.....I lived in the highest (elevation) house in that old steel town, formally Mayor's house, from what I was told.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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