Exhaust Heat riser...
Thread Starter
|
Senior User
Joined: Dec 2014
Posts: 233
Likes: 0
From: Buffalo
Exhaust Heat riser...
I was wondering what this capped metal vacuum line near the rear of the engine was for, and it took me taking my carb off (for a re-build) to see that it goes down to a heat riser on the left bank of the engine. So it's capped and obviously not functional... my question is: with no vacuum applied, is the default position of the baffle OPEN to allow exhaust to flow, or CLOSED to keep exhaust gases somewhat up in the engine to help with warm-up. There will come a time when this pesky little device will be removed when the exhaust is re-done, but for now I'm wondering if I need to hook it up to a manifold source to make certain the exhaust flows freely.
BTW, it's an 84 F250 with a 302
BTW, it's an 84 F250 with a 302
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
I was wondering what this capped metal vacuum line near the rear of the engine was for, and it took me taking my carb off (for a re-build) to see that it goes down to a heat riser on the left bank of the engine. So it's capped and obviously not functional... my question is: with no vacuum applied, is the default position of the baffle OPEN to allow exhaust to flow, or CLOSED to keep exhaust gases somewhat up in the engine to help with warm-up. There will come a time when this pesky little device will be removed when the exhaust is re-done, but for now I'm wondering if I need to hook it up to a manifold source to make certain the exhaust flows freely.
BTW, it's an 84 F250 with a 302
BTW, it's an 84 F250 with a 302
Thread Starter
|
Senior User
Joined: Dec 2014
Posts: 233
Likes: 0
From: Buffalo
But actually, I don't drive the truck in the winter time. Maybe some fall weather (temperature wise) but I don't even drive the truck in the rain.
Also, none of the emissions are hooked up anymore but this was actually disconnected before I even got the truck. I'm just wondering if it's playing a small part in my acceleration problem because the exhaust isn't being vented properly.
Thread Starter
|
Senior User
Joined: Dec 2014
Posts: 233
Likes: 0
From: Buffalo
I'll snap a picture of it an post in the morning. Just got in from work and it's a freaking t-storm out there right now.
Thread Starter
|
Senior User
Joined: Dec 2014
Posts: 233
Likes: 0
From: Buffalo
That's the ticket! So anyone know what position the valve would be in with 0" of vacuum? I would assume closed.
Trending Topics
Laughing Gas
Joined: Aug 2010
Posts: 983
Likes: 49
From: Northern Kentucky
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Thread
Thread Starter
Forum
Replies
Last Post
Kionga
Ford Inline Six, 200, 250, 4.9L / 300
8
Jun 16, 2016 02:01 PM
ewemule
1987 - 1996 F150 & Larger F-Series Trucks
9
Aug 3, 2011 04:03 PM
evin
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
7
May 5, 2004 08:15 PM