Underhood temps
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Underhood temps
Awhile back we were discussing the temp of the air going to the 6637.
I bought one of those electronic temp thingeys from Rat Shack that uses a wired remote sensor (9 bucks on clearance).
On a 95 degree day, dark blue rig:
Stock air box removed, air port built into the batt box coming back.
Ambient temp cold engine, not running, in the sun - 97 degrees.
Mounted 8 inches behind 6637 hot engine 60 mph - 132 degrees.
Mounted to the front of the 6637 where it gets the air flow from alongside the batt box, 60 mph - 119 degrees.
With additional temporary vent "bowl" attached to the air vent going to 6637 - 108 degrees.
At shutdown - 140+ degrees.
I ran air scoops in different locations.
Anything toward the rear is dumping out the back going down under the truck.
All "cool" air is coming from through the grill.
It does no good to add a scoop underneath because of the way the PSD is set up, having the spoiler or whatever it's called under the front bumper. That "spoiler" redirects air toward the grill.
Mounting a bowl-shaped piece of tin to the air inlet in front of the radiator dropped the temps in front of the 6637 by 11 degrees.
Now, mind you, the open air 6637 is getting air AFTER it passes through the hot radiator so the temporary "bowl" lowered the temps by getting more air before it goes through the radiator.
I noticed no difference in the operation of the rig during any part of this unscientific "test".
Summation:
Leaving it as it was before the start of the "test", it cools the 6637 fine enough.
Steve...
I bought one of those electronic temp thingeys from Rat Shack that uses a wired remote sensor (9 bucks on clearance).
On a 95 degree day, dark blue rig:
Stock air box removed, air port built into the batt box coming back.
Ambient temp cold engine, not running, in the sun - 97 degrees.
Mounted 8 inches behind 6637 hot engine 60 mph - 132 degrees.
Mounted to the front of the 6637 where it gets the air flow from alongside the batt box, 60 mph - 119 degrees.
With additional temporary vent "bowl" attached to the air vent going to 6637 - 108 degrees.
At shutdown - 140+ degrees.
I ran air scoops in different locations.
Anything toward the rear is dumping out the back going down under the truck.
All "cool" air is coming from through the grill.
It does no good to add a scoop underneath because of the way the PSD is set up, having the spoiler or whatever it's called under the front bumper. That "spoiler" redirects air toward the grill.
Mounting a bowl-shaped piece of tin to the air inlet in front of the radiator dropped the temps in front of the 6637 by 11 degrees.
Now, mind you, the open air 6637 is getting air AFTER it passes through the hot radiator so the temporary "bowl" lowered the temps by getting more air before it goes through the radiator.
I noticed no difference in the operation of the rig during any part of this unscientific "test".
Summation:
Leaving it as it was before the start of the "test", it cools the 6637 fine enough.
Steve...
Last edited by Steve_250; Jul 21, 2005 at 08:33 AM.
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Joined: Nov 2004
Posts: 798
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Originally Posted by Steve_250
Awhile back we were discussing the temp of the air going to the 6637.
I bought one of those electronic temp thingeys from Rat Shack that uses a wired remote sensor (9 bucks on clearance).
On a 95 degree day, dark blue rig:
Stock air box removed, air port built into the batt box coming back.
Ambient temp cold engine, not running, in the sun - 97 degrees.
Mounted 8 inches behind 6637 hot engine 60 mph - 132 degrees.
Mounted to the front of the 6637 where it gets the air flow from alongside the batt box, 60 mph - 119 degrees.
With additional temporary vent "bowl" attached to the air vent going to 6637 - 108 degrees.
At shutdown - 140+ degrees.
I ran air scoops in different locations.
Anything toward the rear is dumping out the back going down under the truck.
All "cool" air is coming from through the grill.
It does no good to add a scoop underneath because of the way the PSD is set up, having the spoiler or whatever it's called under the front bumper. That "spoiler" redirects air toward the grill.
Mounting a bowl-shaped piece of tin to the air inlet in front of the radiator dropped the temps in front of the 6637 by 11 degrees.
Now, mind you, the open air 6637 is getting air AFTER it passes through the hot radiator so the temporary "bowl" lowered the temps by getting more air before it goes through the radiator.
I noticed no difference in the operation of the rig during any part of this unscientific "test".
Summation:
Leaving it as it was before the start of the "test", it cools the 6637 fine enough.
Steve...
I bought one of those electronic temp thingeys from Rat Shack that uses a wired remote sensor (9 bucks on clearance).
On a 95 degree day, dark blue rig:
Stock air box removed, air port built into the batt box coming back.
Ambient temp cold engine, not running, in the sun - 97 degrees.
Mounted 8 inches behind 6637 hot engine 60 mph - 132 degrees.
Mounted to the front of the 6637 where it gets the air flow from alongside the batt box, 60 mph - 119 degrees.
With additional temporary vent "bowl" attached to the air vent going to 6637 - 108 degrees.
At shutdown - 140+ degrees.
I ran air scoops in different locations.
Anything toward the rear is dumping out the back going down under the truck.
All "cool" air is coming from through the grill.
It does no good to add a scoop underneath because of the way the PSD is set up, having the spoiler or whatever it's called under the front bumper. That "spoiler" redirects air toward the grill.
Mounting a bowl-shaped piece of tin to the air inlet in front of the radiator dropped the temps in front of the 6637 by 11 degrees.
Now, mind you, the open air 6637 is getting air AFTER it passes through the hot radiator so the temporary "bowl" lowered the temps by getting more air before it goes through the radiator.
I noticed no difference in the operation of the rig during any part of this unscientific "test".
Summation:
Leaving it as it was before the start of the "test", it cools the 6637 fine enough.
Steve...
Good job Steve.
You've answered my questions about wheather to isolate the filter or not from the engine compartment. As I recall Dale at Tymar released findings similar to yours back when he introduced the big filter mod. I never read it...but did hear that there wasn't much difference in temps once the truck is moving, and only marginal differences in traffic. But I do like tests done independently by someone that doesn't have anything to do with the product. I know Dale is a standup guy.....it's just nice to see like findings from someone else. Thanks for the info.
Postmaster
Joined: Nov 2004
Posts: 2,854
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From: New Hampshire
i have been thinking about this alot lately... my thought was to make a shield of sheet metal that would have a hole for the intake tuve to run through, and a rubber seal on the top to seal up against the hood... i would like to enclose the filter so it draws air from the snorkel that is still running beside the battery AND from the hole that is in the fender on the driver's side... i was thinking about using the bottom of the stock air box, but modifying it to work with the new filter... i will continue to develop my ideas on this... i'll make a new post if i come up with something that seems to make a difference...
Postmaster
Joined: Nov 2004
Posts: 2,854
Likes: 0
From: New Hampshire
well... not really a factory sealed unit... just trying to set up the 6637 so that is gets more "cool" air... remember the biggest problems with the stock box on the 7.3 are the filtering issues and the restriction of airflow... you figure out how much airflow is being blocked when you install the 6637 and suddenly you can hear the turbo..! now.. if you could get all the filtering and freeflowing benefits of the 6637 AND get some cooler air to it as well, then you have accomplished something... but like i said... i'm just theorizing at this point...!
