Coolant running through throttle body?
Thread Starter
|
Elder User
Joined: Mar 2013
Posts: 847
Likes: 4
From: In my house..
Coolant running through throttle body?
What is the purpose of the coolant line running through the throttle body on my 92' 351W with SDEFI ?
Is it required and could it be beneficial to bypass it ?
I can't imagine why we would want to prematurely heat incoming airflow but what do i know
Is it required and could it be beneficial to bypass it ?
I can't imagine why we would want to prematurely heat incoming airflow but what do i know
Thread Starter
|
Elder User
Joined: Mar 2013
Posts: 847
Likes: 4
From: In my house..
From what i understand the IACV is mechanical in nature and needs warm coolant to operate correctly, otherwise the fast idle would take forever to come down BUT i also understand it is there to keep the throttle body from freezing in extreme climates as you mentioned..
I don't like the idea of pre-heating incoming airflow and cool air is denser and carries more fuel so if since i live in warm climate i will consider bypassing the coolant lines
I don't like the idea of pre-heating incoming airflow and cool air is denser and carries more fuel so if since i live in warm climate i will consider bypassing the coolant lines
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
In a warm climate you won't have a problem, bypassing this was common with the 5.0 Mustang crowd who typically only drove these hopped up cars in the summer. FWIW the coolant that flows through the lower intake also warms the intake air charge and this helps the engine run at a more consistent temperature.
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
That part of the throttle body that the coolant flows through is the EGR plate. That's where hot exhaust gas is fed back into the intake air stream. The engine coolant is passed through the plate, in a separate chamber, to cool down the hot exhaust gas, so it's a very good thing to have.
By the way, the IAC is controlled by the EEC based on many factors, including IAT and ECT. It has nothing to do with the coolant running through the EGR plate, except as a beneficiary of the resulting lower running temps.
By the way, the IAC is controlled by the EEC based on many factors, including IAT and ECT. It has nothing to do with the coolant running through the EGR plate, except as a beneficiary of the resulting lower running temps.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
That part of the throttle body that the coolant flows through is the EGR plate. That's where hot exhaust gas is fed back into the intake air stream. The engine coolant is passed through the plate, in a separate chamber, to cool down the hot exhaust gas, so it's a very good thing to have.
By the way, the IAC is controlled by the EEC based on many factors, including IAT and ECT. It has nothing to do with the coolant running through the EGR plate, except as a beneficiary of the resulting lower running temps.
By the way, the IAC is controlled by the EEC based on many factors, including IAT and ECT. It has nothing to do with the coolant running through the EGR plate, except as a beneficiary of the resulting lower running temps.
Trending Topics
Junior User
Joined: Sep 2017
Posts: 51
Likes: 0
Ok, I find this topic interesting. I've been looking at this puzzle as a little of both. Keeping the throttle from freezing and keeping the egr from cooking the tender bits of the throttle body assembly.
Thing is; if you are going to disable the throttle body heat in pursuit of performance, why wouldn't you also or already have a egr delete kit of some variety?
I think it would be more beneficial to cut off the heat on a engine that has the egr blocked off. Cutting off the heat with egr may possibly reduce performance due to the heat added.
If... I can get my current project to run right, I would like to test this some. A valve in line to the throttlebody heat and plugging the vacuum line to the egr should do it. Need to plan a repeatable scenario to test it but that should be easy. Some milage and 0-60 comparisons would at least make each configuration quantifiable.
Thing is; if you are going to disable the throttle body heat in pursuit of performance, why wouldn't you also or already have a egr delete kit of some variety?
I think it would be more beneficial to cut off the heat on a engine that has the egr blocked off. Cutting off the heat with egr may possibly reduce performance due to the heat added.
If... I can get my current project to run right, I would like to test this some. A valve in line to the throttlebody heat and plugging the vacuum line to the egr should do it. Need to plan a repeatable scenario to test it but that should be easy. Some milage and 0-60 comparisons would at least make each configuration quantifiable.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
If you really want to keep exhaust heat out of the intake, you would block off the passages where they come in from the heads. Most lower intake manifold gaskets have this part opened up to allow exhaust to enter the lower intake. The next place you can do it is the gasket between the lower and upper intakes.
Decades ago, when I lived in a cold climate, I had a severe case of carburetor icing. Driving through a blizzard, the engine from which I had removed the heat riser for the air intake snorkel started to stumble badly. A block of ice had formed around the intake horn from all the snow that had somehow vaporized and gotten past the air filter. It was no fun chiseling the ice from the carb in the middle of a blizzard.
Decades ago, when I lived in a cold climate, I had a severe case of carburetor icing. Driving through a blizzard, the engine from which I had removed the heat riser for the air intake snorkel started to stumble badly. A block of ice had formed around the intake horn from all the snow that had somehow vaporized and gotten past the air filter. It was no fun chiseling the ice from the carb in the middle of a blizzard.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Lead Driver
Joined: Sep 2003
Posts: 7,015
Likes: 208
From: SoCal
Here are a couple of pictures of a 1990's GT40 type intake manifold to illustrate.
First from the driver's side. That hole between the two bolt holes mate with the exhaust port on the intake side of the head.
And from the top. The hole from the side leads to the small black hole in the middle, which mates with a similar hole in the upper plenum, which routes to the EGR plate mounting surface.
Thread
Thread Starter
Forum
Replies
Last Post
dgmid61
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
1
Jan 20, 2008 08:43 PM
quisp-n-quake
1987 - 1996 F150 & Larger F-Series Trucks
4
Sep 24, 2007 06:02 PM
eco
1987 - 1996 F150 & Larger F-Series Trucks
21
Apr 1, 2007 10:32 PM
minnesota4x4
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
2
Jan 26, 2006 10:05 AM