Homemade Jeep Snorkel w/pics - Page 6

fyrdriver · 06-29-2009, 02:40 PM

Quote:

Originally Posted by BWFBezerk

How long is this total, including bends? I want to do this with one solid piece, what length should I use?

Its about 58 inches, the reason I say about is because depending on where you measure inside or outside it differs. I took the longest route to make sure you would have enough. Leave yourself a little extra on both ends so you have some adjustablilty. You can always cut it off after your final fitment.
Also as I stated before unless you know of a place that can mandrel bend it for you, the tubing will have kinks in it, thats why I welded mine up.
Hope this helps, good luck.

johnny9 · 07-02-2009, 11:00 PM

well i started a aluminum snorkel today out of 2x3x1/8 aluminum tube today to see if it looked allright..the tube i had was in bad shape so i had to smooth it out the best i could with what i had..heres some pics taken while doing it.
got the angle cut,welded, and ground down.

angled the end to cut some air while cruisein at 60mph.

then drilled a 2-1/4 inch hole for 2-1/2 inch tube to go thru hood.

then welded the 1/8 thick pipe to the tube.

johnny9 · 07-02-2009, 11:10 PM

heres some pics of it bolted up..2 bolts on 8-1/2 inch centers for the windshield brakets where welded to the snorkel..theres also a bent and modified braket under the hood to attach the pipe with a bolt also..for when i run thru the trees hopefully it will stay put..the hood holds it snug also.

tomorrow i will work on a top..thinkin about useing a 3 inch x 1/8 thick pipe and cut out a 2 and a half inch strip and faceing it twoward the back of jeep since it should get plenty of air from the windshield..

dosent look as good as i had washed but will work fine for now..sure it will look better when its powder coated satin black too,,i hope..

tx_medic · 07-03-2009, 01:05 AM

hoping I hadn't overlooked this, but has anyone considered or established the CFM requirements for the engine's intake when building snorkels?

**YJake** · 07-03-2009, 01:09 AM

Quote:

Originally Posted by tx_medic

hoping I hadn't overlooked this, but has anyone considered or established the CFM requirements for the engine's intake when building snorkels?

Considered a whosawhatsa?

johnny9 · 07-04-2009, 11:44 PM

Quote:

Originally Posted by tx_medic

hoping I hadn't overlooked this, but has anyone considered or established the CFM requirements for the engine's intake when building snorkels?

well the factory airbox hole is what,,a 1 1/2 at its biggest where it comes outta the airbox..

heres the thread to my new completed airbox for those intrested..it turned out fairly nice but better the next time..i might start selling them..just the snorkel tho not the airbox..

homebrew snorkel..
http://www.jeepforum.com/forum/f9/homebrew-aluminum-snorkel-810246/

tx_medic · 07-05-2009, 12:18 AM

Quote:

Originally Posted by johnny9

well the factory airbox hole is what,,a 1 1/2 at its biggest where it comes outta the airbox..

heres the thread to my new completed airbox for those intrested..it turned out fairly nice but better the next time..i might start selling them..just the snorkel tho not the airbox..

homebrew snorkel..
http://www.jeepforum.com/forum/showthread.php?t=810246

The obvious limitations are with the ports and valves, I'll have to get into that when I'm not drnkng at a pool hall... but my concern is that over distance, both diameter and surface area will affect the volume of the column of air entering the throttle body. The requirements of the engine are at least the displacement times the max rpm's. So a 2.5 x 5k is in excess of 440 cfm (cubic feet per minute).

my question was if anyone has actually established a minimum.... I'm guessing 600+ cfm to be safe, and then allow the exhaust to be the limiting factor on the other side of combustion.

tx_medic · 07-05-2009, 02:32 AM

Ok, so 441.4 CFM would be the minimum requirement per the 4-cyl engine at 5,000 rpm... I think. When it comes to physics I'm pretty sure that the actions of a column of gas are about as complex as it gets. So add enough margin of error as well as room for a port job and exhaust upgrade or modification I'd say 600 to 700 CFM is an adequate base for calculation of intake requirements...

the calculations for a column of air passing through your snokel however... I'm not sure how to derive them at this time.

I'll do a bit more research on the manor and see what comes up. The idea is to establish a safe (from debris and moisture) intake that is not restrictive. Of course, filters, bends, diameters, surfaces are all factors.... and most of this is a bit over my head so i'll have to learn as I go.

My goal is to create an intake solution that is not the limiting factor, thus allowing room for modification/improvement further down the line.

johnny9 · 07-05-2009, 09:49 AM

Quote:

Originally Posted by tx_medic

The obvious limitations are with the ports and valves, I'll have to get into that when I'm not drnkng at a pool hall... but my concern is that over distance, both diameter and surface area will affect the volume of the column of air entering the throttle body. The requirements of the engine are at least the displacement times the max rpm's. So a 2.5 x 5k is in excess of 440 cfm (cubic feet per minute).

my question was if anyone has actually established a minimum.... I'm guessing 600+ cfm to be safe, and then allow the exhaust to be the limiting factor on the other side of combustion.

while your right..ive just been looking at all the arb and volant and other homemade snorkels and figured what ive come up with will work fine..well,i hope so..i think its still better than any stock airflow for sure as the air is kinda forced down the snorkel while driveing..haha
right now its just a new extra cooling device when im driveing,till it gets hooked up under the hood..

tx_medic · 07-05-2009, 10:16 AM

oh, i'm sure a safe bet is to mimic the aftermarket snorkels in proportion, and I don't have a problem with your snorkel (looks bad a**), i just want to make sure if I do anything to my intake that i'm not limiting my power.

muddy93 · 07-10-2009, 12:13 PM

I think your 441.4 CFM figure is a little much.
acording to the cfm formula found here,
http://www.classicinlines.com/CFMcalc.asp
the 2.5L engine only draws in about 221.9 cfm @ 5000rpm.

you have to remember that because these are 4 stroke engines, they require 2 revolutions to draw in their full displacement volume.

johnny9 · 07-10-2009, 04:49 PM

ok guys,,ive just been driveing in a down pour of rain for almost 3 hrs and all i can say is the new snorkel and air box are definitly better than stock..im saying this because when all the cool rain air hits the throttle body when i floor it ,it is superior to the stock air box as i can feel quite a bit more power ans smoothness..when its hot and normal i didnt feel no diffrence,but in the rain..wow,its like a race jeep,haha..
in a minute im gonna take the filter out to see if any water gets in there at all..
im sure that it isnt as i made a 1/2-5/8 lip inside the top where the pipe meets the tubeing and i cant see it going up hill..but the fast flow of air when cruiseing may get in a little..i will see soon.
as for the aftermarket snorkels they almost have to get more water in them than the one i made..if i need to explain this further just ask and i will get into more detail to make ya understand what i did after seeing and looking at what arb snorkel does to get the water out..if it even works..id like to know who has a aftermarket snorkel and if after a rain storm is there snorkel tube perfectly dry?

muddy93 · 07-11-2009, 08:13 AM

I'm in the process of putting one of these together. I'm using 3" round tube, and will be plugging the stock inlet on the air box, and coming into the side of it with the new tube.

anyway, I was wandering about the top of the snorkel(I really like the way that johnny9 finished his).
I was wandering, would you get more of a "ram" effect if you face the opening down(to try to catch the air that is being forced up the windshield)? or is having the opening facing forward, like all the other snorkels, still the best bet?

fireshadow · 07-11-2009, 05:53 PM

Quote:

Originally Posted by johnny9

well the factory airbox hole is what,,a 1 1/2 at its biggest where it comes outta the airbox..

heres the thread to my new completed airbox for those intrested..it turned out fairly nice but better the next time..i might start selling them..just the snorkel tho not the airbox..

homebrew snorkel..
http://www.jeepforum.com/forum/showthread.php?t=810246

if you start selling these let me know I defiantly would be interested.

johnny9 · 07-11-2009, 09:09 PM

Quote:

Originally Posted by fireshadow

if you start selling these let me know I defiantly would be interested.

i would like to make some of them for you guys but im no big fancy compant,just me.i love to fab up stuff when ive got time and lately ive got a lot of it..
i can build the snorkel as you see it on my jeep exactly the same and you have to notch your own hood(i used wiss snips easly)and where the snorkel enters the hood it will stop..and people that want them will have to build there own airbox set up and plumb it..i can build it and get it powder coated satin black for 425 bucks,shipping included..i dont want to do the airbox because of the diffrent set ups there is and stuff thats got to be moved for diffrent jeeps..the material is all 1/8 inch thick aircraft aluminum exstrusion.
let me know and i will build them as i get a honest word(computer handshake,haha) of wanting one and then i can pm or e-mail the pics of it when finished..then ship it when its payed for