cold air intake
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Joined: Jan 2012
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cold air intake
im a newb.....i have a 94 f150 4.9....i wanted to know if replacing air filter/box with cold air intake is worth it....and also the breather cap on top of the valve cover behind the oil fill...do i need this item which runs to the air box..thanks for any help..... this all started with notice of poor gas milege..i recently changed plugs and wires thanks again
Cargo Master
Joined: Jan 2011
Posts: 2,791
Likes: 8
From: Edmonton AB, Canada
Most say it's not worth it. It doesn't really "help". But I do find that it makes it more agressive sounding since I can ear the intake in the cab. I love the sound.
The part that goes from the valve cover to the intake box I just cut the tube shorter and re used it on the intake I put in. It came with a piece of hose for it but it was blue and my truck is red.
The part that goes from the valve cover to the intake box I just cut the tube shorter and re used it on the intake I put in. It came with a piece of hose for it but it was blue and my truck is red.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
.and also the breather cap on top of the valve cover behind the oil fill...do i need this item which runs to the air box
Yea you want that, provides for filtration of the air drawn through the CC.
Yea you want that, provides for filtration of the air drawn through the CC.
Cargo Master
Joined: Jan 2011
Posts: 2,791
Likes: 8
From: Edmonton AB, Canada
Since its technically not a cold air intake since it takes the hot air from the engine bay....
I found this
Higher intake charge temperature has been found to increase the flame speed, the combustion reaction rate, the uniformity of the fuel-air mixture and reduce the heat transfer rate though the cylinder walls. This all adds up to the engine using more heat for physical movement and less being wasted.
The downside to this is that hotter air also tends to retard ignition timing and cause engine pinging. Different engines will react differently to warm air intakes and testing will need to be done to see if it will work for your specific vehicle. Saturns are known to react well to warm air intakes.
http://ecomodder.com/forum/fuel-econ...cations.php#12
I found this
Higher intake charge temperature has been found to increase the flame speed, the combustion reaction rate, the uniformity of the fuel-air mixture and reduce the heat transfer rate though the cylinder walls. This all adds up to the engine using more heat for physical movement and less being wasted.
The downside to this is that hotter air also tends to retard ignition timing and cause engine pinging. Different engines will react differently to warm air intakes and testing will need to be done to see if it will work for your specific vehicle. Saturns are known to react well to warm air intakes.
http://ecomodder.com/forum/fuel-econ...cations.php#12
Posting Guru
Joined: Jun 2003
Posts: 2,314
Likes: 0
From: southwest michigan
Higher intake charge temperature has been found to increase the flame speed, the combustion reaction rate, the uniformity of the fuel-air mixture and reduce the heat transfer rate though the cylinder walls. This all adds up to the engine using more heat for physical movement and less being wasted.
The downside to this is that hotter air also tends to retard ignition timing and cause engine pinging. Different engines will react differently to warm air intakes and testing will need to be done to see if it will work for your specific vehicle. Saturns are known to react well to warm air intakes.
The downside to this is that hotter air also tends to retard ignition timing and cause engine pinging. Different engines will react differently to warm air intakes and testing will need to be done to see if it will work for your specific vehicle. Saturns are known to react well to warm air intakes.
most of that makes sense, but the thermodynamics don't make sense. If I'm not mistaken, a colder intake charge would yield cooler cylinder temps (and EGTs). This would mean that the difference between flame temp and the engine block's temp (governed by the thermostat) would be less than if you had a warm intake charge (warmer combustion process). The bigger the difference in temp, the more heat will move out of the cylinder through the block and eventually removed by the cooling system. This is why a cooler Tstat robs power, it widens the gap between cylinder temp and block temp.
So wouldn't a warm air intake actually make more heat flow out of the cylinder into the block? Does this make sense or am I way out in left field?
Cargo Master
Joined: Jan 2011
Posts: 2,791
Likes: 8
From: Edmonton AB, Canada
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Hotshot
Joined: Sep 2001
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Just keep the stock air box. Its already a cold air intake. The aftermarket type stuff is actually a warm air intake. I had the KN FIPK and will never do that again. Royal waste of money.
A cooler T stat does rob power. I tried it years ago. My truck ran way rich and got lousy fuel mileage. Also, the computer expects the truck to be fully warmed up.
A cooler T stat does rob power. I tried it years ago. My truck ran way rich and got lousy fuel mileage. Also, the computer expects the truck to be fully warmed up.
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Tuned
Joined: Apr 2011
Posts: 464
Likes: 5
From: Redmond, WA USA
Put a wanted post in the classifieds. Most people that put in the "CAI" throw their stock air intakes into the trash, and would probably mail you theirs for the cost of the shipping. I've got the stock one on my truck, but unfortunately for you I'm keeping it!
Or head-on down to your local junkyard. Or, online, www.car-part.com.
Or head-on down to your local junkyard. Or, online, www.car-part.com.