6637 Mod & Air Density
Thread Starter
|
Junior User
Joined: Jul 2004
Posts: 86
Likes: 0
From: NE Kansas
6637 Mod & Air Density
I am a little confused with the 6637 mod. As I understand it, what we want is more oxygen flowing to the motor. The 6637 mod, in theory, allows more unrestricted air flow, but if it is open and drawing air from under the hood then it would be reasonable to expect the temperature of that air to be higher. This is especially true during the summer. Once air temperature increases it expands and reduces the amount of oxygen molecules, which is what we need for an efficient burn. It also increases the temperature on the power stroke, which in turn increases stress on the motor and the level of nitrogen oxides. Would it not be more efficient to build something to bring in air from outside? All of this seems counter intuitive when viewed from a theory perspective.
Thread Starter
|
Junior User
Joined: Jul 2004
Posts: 86
Likes: 0
From: NE Kansas
Thanks Neal. I think I will start with the 6637 and filter cover, then slowly start to modify the entire cold air intake. As soon as I figure out how best to make the ccv mod. Then eventually fabricate something to bring cold air in from the front. Seems there are plenty of opinions on how to do it. I like the way C00nhunterjoe did his and also 97 HD. Thanks again. I think I will request this thread gets closed.
Tuned
Joined: Jun 2004
Posts: 472
Likes: 4
From: Goodyear, AZ
I don't think the 6637 mod is really geared towards cold air intake as it is just a better air filter for our trucks. If you want cooler temps for the motor, Intercooler is the way to go since after the filter, the turbo just heats up the air anyways.
Postmaster
Joined: Apr 2004
Posts: 3,658
Likes: 0
From: Ellensburg, Washington
Yup
Cowboy Steve
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
Likes: 1
From: Southwest Georgia
A test was done a couple of years ago where a guy used two digital thermometers to measure the air temp infront of the grill and the air temp under the hood next to the air filter. The final results were that while driving (vehicle moving) there was only about 3-4 degree difference in the two temps (during the summer). When sitting still, the under hood temp would rise like 40 or so degrees.
So basicly with a vehicle that does not have a totally enclosed engine compartment (bottom of our engine compartment is open) there is enough air flow to move the hot air down and away from the filter.
But as stated above, the turbo heats up the intake air before it goes into the engine, so to cool intake air temp when it enters the engine you will need an intercooler.
So basicly with a vehicle that does not have a totally enclosed engine compartment (bottom of our engine compartment is open) there is enough air flow to move the hot air down and away from the filter.
But as stated above, the turbo heats up the intake air before it goes into the engine, so to cool intake air temp when it enters the engine you will need an intercooler.
Thread Starter
|
Junior User
Joined: Jul 2004
Posts: 86
Likes: 0
From: NE Kansas
Thanks for the feedback. I am going to do the mod. I have the filter and 4" pipe and the cover is on the way. All I have to do is have the pipe bent and some mounting tabs welded on.
Trending Topics
Senior User
Joined: May 2008
Posts: 157
Likes: 0
you dont need any mounting.. you should buy a 4" pipe already bent.. your local NAPA should have a 4" pipe witha 45" bend in it.. somewhere around 12 or more inches in length of pipe is good.. the pipe and filter will just rest where the old filter used to be..
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Elder User
Joined: Dec 2008
Posts: 657
Likes: 0
From: Ocala
Here is a direct quote from Dale at Tymar performance: "Initial tests on a 1995 PSD shows much less restriction than the stock set-up. A bone stock truck will gain 1 to 2 psi of boost. Slightly modified truck will gain 3 to 4 psi. No issues with rain or snow have been noted. Concerns with taking in warm "under hood" air have tested to be false. Intake temp rise over ambient has been tested at 45° max (sitting still idling for over 15 min), but faster than 20 mph and the temp rise is only 10° to 20° over ambient. Although it is true that warm air is less dense, the drop in restriction and gain in overall boost more than make up for any loss in density. Also, the PSD adds fuel according to pressure, not density, so there may be a very slight increase in general performance. EGT's seem to drop approx 50°. Of course, your truck may vary, but I used test data from 3 trucks in different parts of the country (Houston, TX was hottest, Spokane, WA was coldest). "
And here is a great link for 6637 installs - https://www.ford-trucks.com/forums/824714-6637-s.html
And here is a great link for 6637 installs - https://www.ford-trucks.com/forums/824714-6637-s.html
Posting Guru
Joined: Jul 2008
Posts: 1,151
Likes: 0
From: Blackwater, VA
Here is a direct quote from Dale at Tymar performance: "Initial tests on a 1995 PSD shows much less restriction than the stock set-up. A bone stock truck will gain 1 to 2 psi of boost. Slightly modified truck will gain 3 to 4 psi. No issues with rain or snow have been noted. Concerns with taking in warm "under hood" air have tested to be false. Intake temp rise over ambient has been tested at 45° max (sitting still idling for over 15 min), but faster than 20 mph and the temp rise is only 10° to 20° over ambient. Although it is true that warm air is less dense, the drop in restriction and gain in overall boost more than make up for any loss in density. Also, the PSD adds fuel according to pressure, not density, so there may be a very slight increase in general performance. EGT's seem to drop approx 50°. Of course, your truck may vary, but I used test data from 3 trucks in different parts of the country (Houston, TX was hottest, Spokane, WA was coldest). "
And here is a great link for 6637 installs - https://www.ford-trucks.com/forums/824714-6637-s.html
And here is a great link for 6637 installs - https://www.ford-trucks.com/forums/824714-6637-s.html
Elder User
Joined: Jul 2007
Posts: 893
Likes: 0
From: Lawrenceburg, TN
Thanks Neal. I think I will start with the 6637 and filter cover, then slowly start to modify the entire cold air intake. As soon as I figure out how best to make the ccv mod. Then eventually fabricate something to bring cold air in from the front. Seems there are plenty of opinions on how to do it. I like the way C00nhunterjoe did his and also 97 HD. Thanks again. I think I will request this thread gets closed.
Thread Starter
|
Junior User
Joined: Jul 2004
Posts: 86
Likes: 0
From: NE Kansas
Right now I am just going to remove the air box and put a 45 degree 4" o.d. pipe elbow in to connect the 6637. When I have more time I plan on getting a longer piece of pipe and welding some brackets on it. At that point I will reroute the ccv hose. So, in the end, the longer pipe will bolt up to the existing bracket on one end and below the filter on the other, so the filter is suspended. Napa can get me whatever I need. I just call in the morning, give them the specs, and they have it by noon. I will have to weld the brackets myself. And I already have a filter cover on order.
I used all of the pics I could find to map out what I was going to do. Pics help a lot.
I'll post pics when I am done.
Thanks everyone.
I used all of the pics I could find to map out what I was going to do. Pics help a lot.
I'll post pics when I am done.
Thanks everyone.