Hummer intake for YJ-- write-up with many pics - Page 3 - JeepForum.com

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post #31 of 37 Old 04-06-2009, 02:01 AM Thread Starter
swedishdwarf
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Quote:
Originally Posted by ITSA96 View Post
One particular section contains a pair of trees that lean in towards ea other at the top of a nasty hill. You have to gain momentum to get up the hill and as you pass between the trees you get slammed to the side and slide through on your roll bar. If you have your windshield up it takes the majority of the abuse.
Holy hell, count me out. If it's that big of a deal you can always take the windshield off, or take off the precleaner and the hose from the firewall to the air box and fold down the windshield as usual

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Man I love what you have done here. I noticed you mentioning that 2 1/2" would have been easier. That is probably what I will go with. Any reasons why you didn't other then it sounding like 3" parts was what you had around.
I went with 3" because the precleaner I liked was a 3" output. I couldn't find a 2-1/2" model within the CFM range for this engine.

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This would be my first major mod and I have only had my 95 yj for about a month. How do you get past doing that first cut hoping that your not going to screw something up royally??
In order to not be afraid, you have to quantify the worst case scenario, and have a solution ready in your mind for that disaster. Have a Plan B. Here, the worst case scenario is making a mess of the cowl. A good Plan B would be fabbing some kind of patch to both support the snorkel elbow and conceal the damage. That's not so bad, is it? Great, now start cutting!


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post #32 of 37 Old 04-06-2009, 11:20 AM
Poobah
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Quote:
Originally Posted by ITSA96 View Post
One particular section contains a pair of trees that lean in towards ea other at the top of a nasty hill. You have to gain momentum to get up the hill and as you pass between the trees you get slammed to the side and slide through on your roll bar. If you have your windshield up it takes the majority of the abuse.
I would think that is a good reason to carry a chainsaw on your rig...plus it is good to have when the zombies come...



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post #33 of 37 Old 07-01-2009, 05:55 PM
tx_medic
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I was looking at the top-spin precleaners and I'm wondering about the required CFM for the 4-cyl YJ? Does anyone know the minimum/maximum and optiamls?
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post #34 of 37 Old 12-03-2009, 11:10 AM
muddy93
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I know it's a little late, but anyway,
here's how to go about figuring the CFM requirements of the engine.
(cubic inches x max rpm) / 3456 = cfm

so, a YJ 4 cylinder is 2.5L, multiply that by 61 to get the cubic inches, 2.5 x 61 = 152.5ci

I don't know the max rpm for the 2.5, so I"m just going to use 4k for this example.

152.5ci x 4000 = 610000

610000 / 3456 = 176.5 cfm

so, a 2.5L YJ four cylinder requires 176.5 cfm of air to run at 4ooo rpm.

NOTE: This formula figures the cfm at a 100% volumetric efficiency; therefore, the actual cfm requirement to run the engine will be slightly less.

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post #35 of 37 Old 03-19-2010, 10:57 PM
Nates93yj
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Do you Notice any intake sound in the cab, if so how bad?

NATE
2003 GMC 2500 Duramax
2004 Jeep Wrangler Columbia Edition
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post #36 of 37 Old 09-17-2010, 01:57 PM
BrockGrimes
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Updates?

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post #37 of 37 Old 05-23-2013, 05:51 PM
Bravo1782
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This mod is pretty sick, but here's my concern...so you drop that fuse box a couple of inches...does it put it in the way of boot mud\being stepping on, etc? Is it still safe where it gets moved to?
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