Effect of grill block and exhaust manifold heat shield on air intake system - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Go Back   Fuelly Forums > Fuel Talk > Aerodynamics
Search Today's Posts Mark Forums Read Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 09-21-2008, 04:21 PM   #1
Registered Member
 
Join Date: Apr 2008
Posts: 71
Country: United States
Question Effect of grill block and exhaust manifold heat shield on air intake system

I'm planning to make a grill block for my car but I've got concerns about it blocking the airflow into the engine. The factory plastic intake is behind the factory grill and by blocking it, it would seem that I'm allowing less air into the engine.

In theory, would this make the engine run leaner by decreasing the fuel consumption? Would this also force the engine to take in hotter air inside the engine bay, resulting in less fuel consumption?

What if I also removed the exhaust manifold heat shield while the grill block is on? Would that heat up the air around the engine compartment and intake, thus acting sort of like a warm-air intake (thus decreasing fuel consumption)?

Thanks.
__________________

__________________
FLAteam is offline   Reply With Quote
Old 09-21-2008, 05:57 PM   #2
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Fuel is metered based on how much air is consumed, so it won't run leaner. If it's restricted too much, you could end up wasting energy trying to suck the air in. You don't make it sound like the grille block will be close enough to the intake for that to happen.

It will probably increase intake air temperature, which helps for some people and has no effect for others.

I can't offer a guess about the heat shield.
__________________

__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 09-21-2008, 06:44 PM   #3
Registered Member
 
GasSavers_BEEF's Avatar
 
Join Date: Apr 2008
Posts: 1,831
unless you have a full bellypan, you won't restrict the air coming in. my grill is completely covered and I have a fairly large air dam along with a WAI which I achieved by making a heat shield (car didn't come with one) and taking the air from INSIDE the heat shield which has pushed my temps to almost 180 degrees which has helped my efficiency. take a look at my gaslog.

I will say that this doesn't work for everyone but it did work for me. if you have a scangauge you can monitor your incoming air temp. depending on how your car regulates the fuel, it will or won't help. I am not sure what the situation is where it doesn't help as it helped for me. I do have a pic of my grill block and intake in my garage also of my airdam which I didn't see too much from as far as gains. I am just too lazy to take it off. plus it gets me a lot of questions and attention.
__________________
Be the change you wish to see in the world
--Mahatma Gandhi



GasSavers_BEEF is offline   Reply With Quote
Old 09-22-2008, 08:55 PM   #4
DRW
Registered Member
 
Join Date: Oct 2006
Posts: 615
Country: United States
Take a good look in the vicinity of the exhaust manifold before you remove the heat shield. Sometimes there are sensitive components close to the exhaust which can't tolerate the heat. On my car the alternator is right next to the exhaust manifold. I've heard plenty of stories from others who own the same car that I have. They tend to blow alternators and develop leaks in the power steering pump soon after removing the heat shield.
__________________
Dave W.
DRW is offline   Reply With Quote
Old 10-02-2008, 08:58 AM   #5
Registered Member
 
Join Date: Apr 2008
Posts: 71
Country: United States
that's a really good point about the heat sheild's proximity to other components...I'll take a look at that. Thanks!
__________________
FLAteam is offline   Reply With Quote
Old 02-22-2009, 02:04 PM   #6
Registered Member
 
fowljesse's Avatar
 
Join Date: Mar 2008
Posts: 188
Country: United States
I went all out, and made a ram air setup, heat-wrapped my headers, put a fine mesh over my grills, and made a coroplast belly pan.
If it would help, I can put up pictures.
fowljesse is offline   Reply With Quote
Old 02-23-2009, 10:00 AM   #7
Senior Member
 
Join Date: Mar 2011
Posts: 446
Country: United States
Location: Charlotte nc
here is mine I left the coroplast white to emphasize my point of there is no need for 14 feet of parachute on the front of my car. I run right at the temp the thermostat opens and the car rolls much further. I also run a hot air intake and it works my temps run between 140f and 160f but I had it fall off once costing me 10mpg
Philip1 is offline   Reply With Quote
Old 02-24-2009, 08:24 AM   #8
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
Convert the roof rack into a vortex generator!
JanGeo is offline   Reply With Quote
Old 02-25-2009, 10:02 AM   #9
Senior Member
 
Join Date: Mar 2011
Posts: 446
Country: United States
Location: Charlotte nc
we had snow not too long back and as I drove my wake looked like a perfect cone I think at this point I need to concentrate on making it cut the air better at the front and not worry so much about the back
Philip1 is offline   Reply With Quote
Old 03-02-2009, 07:07 PM   #10
Registered Member
 
Join Date: Dec 2007
Posts: 618
Country: United States
my mileage literally went up from a all time max of 33mpg highway to 46mpg highway, with 50psi in tires, drafting at about 80 ft on semi's, and a HAI+heat shield. View my gaslog for more info or pics. Heck, I just got 38mpg highway w/ winter fuel and intake temps only reaching 85*F

edit: not to mention my engine is so loose I'm burning 2 quarts of oil every 300 miles driven.
__________________

__________________
John
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2
Project84 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Family Carpooling BumblingB General Discussion (Off-Topic) 2 06-07-2008 01:37 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 07:19 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.