home made intake
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Senior User
Joined: May 2006
Posts: 352
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From: dryden,michigan
home made intake
soo i finally made a intake system bout as good as its gona get for now i got 3 inch pcv pipe and a 90 to come outta the turbo and ran it acros the motor and a big cone air filter soo is thatbig enuff for the suction am i rally cant tell a differnt sept maybe it does better above 2800 rpms not a noticble differnce and i think my milage is about the same I really want to know tho Why does my truck hits 1200 egts climbing a hill with my 23 ft boat I MEAN i can stay at 65-70 but im basecally to the floor unless i kick it outa overdrive but i swear that boat cant weigh more then 6000 lbs if any of you guys live around michigan im talkin about the zilwalkie bridge and and i wont barely go over 800 unloaded
Elder User
Joined: Apr 2006
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From: South Dakota
Cold air makes more power than hot air. From your description I'm guessing your intake system isn't piped all the way to the grill. That cone filter is more in likely pulling in hot air from around the engine if I'm reading it right. If you find the time you might install a temp guage in the intake piping to see what kind of air you are pulling in. If need be you can adjust it to find the coolest spot.
Elder User
Joined: Mar 2006
Posts: 901
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From: North-Eastern, Ohio
Or just build a heat shield and build it so that it will force cooler air from the grill, just take some thin sheet metal and cut a notch for the pipe, and bent it to fit and clear the pulleys and stuff.
Elder User
Joined: Sep 2006
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Bone, I had the same problem with my 6.9 N/A with dual air intake & dual 3 inch exhaust?!!
From all the info I have read, you can't have high EGT's without fuel....my pump was not turned up but I had high oil consumption.
I'm not suggesting that it's the same for you but without an intercooler or water injection, the only way to keep the EGT's down is your right foot.
From all the info I have read, you can't have high EGT's without fuel....my pump was not turned up but I had high oil consumption.
I'm not suggesting that it's the same for you but without an intercooler or water injection, the only way to keep the EGT's down is your right foot.
Freshman User
Joined: Jul 2007
Posts: 42
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From: Ohio
Good morning,
I have a 1989 F350 4x2 w/7.3L N/A IDI. I've done quite a bit of reading on cold air intakes for the engine and was wondering if anyone has come up with a way to get positive pressure into the intake without modifing the grill, headlights, or sheet metal on the front of the truck...I'm thinking there has to be a way to keep near-stock appearance whilst enjoying the benefits of ram air. Any input is appriciated.
~Jon
I have a 1989 F350 4x2 w/7.3L N/A IDI. I've done quite a bit of reading on cold air intakes for the engine and was wondering if anyone has come up with a way to get positive pressure into the intake without modifing the grill, headlights, or sheet metal on the front of the truck...I'm thinking there has to be a way to keep near-stock appearance whilst enjoying the benefits of ram air. Any input is appriciated.
~Jon
Postmaster
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From: Coal Region
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Senior User
Joined: Jan 2007
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From: Jamestown, Ohio
I have a bolt on hood scoop that I won't to make into a functional ram-air hood, but how do I keep the water out of the intake when it rains?
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Posting Guru
Joined: Oct 2005
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From: Powell River B.C.
I have a positve pressure cold air system that only involved cutting plastic out of the grill, fabricating a difflector from behind the grill, up behind the headlight to a big mother fiberglass scoop. I have measured 3 times the ram air pressure in the back of that scoop compaired to the stock scoop at 55 mph. Click on my gallery for pictures and more how to details.
Junior User
Joined: Jul 2007
Posts: 70
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From: NW Ohio
I cut a 4inch hole in the firewall above/beside the mastercylinder and ran 4in aluminum dryer duct to the factory air box. Gained 1psi boost and EGTs dont rise near as fast. The hole is about 1inch off the floor of the cowl so water wont get in, I've had this setup for almost 2 years and have never found water in the air ducts or air box. Id post a pic, but I havent figured that out yet, maybe I'll try later tonight.
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
You need some way to get outside air into the motor. I ran a temp test and the air under the hood at the intake(pre-filter)was 140* at 60mph when it was only 70* outside. I have a cowl intake and it dropped the intake temp to about 80*. The temp probe was inside the airbox. Here is the cowl intake made by hypermax.
Postmaster
Joined: Apr 2008
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Psychodude, what was the temp number with the factory intake? Also how is your factory intake ducting routed? I seem to recall mine being over the battery at one point, now I have the 6.9-style ducting that goes under the battery and draws from behind the grille through a large opening in the firewall that was there from the factory, so it's a true cold-air intake.
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
Psychodude, what was the temp number with the factory intake? Also how is your factory intake ducting routed? I seem to recall mine being over the battery at one point, now I have the 6.9-style ducting that goes under the battery and draws from behind the grille through a large opening in the firewall that was there from the factory, so it's a true cold-air intake.