I did this ________ for $100 OR LESS! - Page 53 - JeepForum.com
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post #781 of 2216 Old 05-04-2012, 11:06 AM
BenJammin
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Home depot special snorkel for 50.00

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post #782 of 2216 Old 05-04-2012, 11:47 AM
jamesdevore
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Quote:
Originally Posted by BenJammin View Post
Home depot special snorkel for 50.00

Attachment 391924
Maybe it's just me but I think you'll have trouble drawing air though that design

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post #783 of 2216 Old 05-04-2012, 11:56 AM
Neoxxis
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Not sure how big the oem air intake is on these Jeep's but on the JK it's a good 3"...
With such a small pipe it may have to suck hard to get the amount of air it needs...

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post #784 of 2216 Old 05-04-2012, 01:54 PM
BenJammin
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Its 2" and it seems to be okay... my TB is only 2.5" so its not to much restriction
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post #785 of 2216 Old 05-04-2012, 09:12 PM
McCloudsZJ
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Quote:
Originally Posted by BenJammin View Post
Its 2" and it seems to be okay... my TB is only 2.5" so its not to much restriction
Bernoulli equation says you might be suffering more than you think you are.

Assuming:
-The air in your intake is incompressible
-Pressure at the TB inlet is approximately 50 psi
-Pressure at the inlet to your snorkel is 14.7 psi (atmospheric)
-Inlet velocity for the air is 10 ft/s (this value doesn't really matter for the answer--it's an arbitrary value)

If the OEM diamater is 2.5", then the area is 4.909 in^2
If your snorkel diameter is 2", then the area is 3.142 in^2

Bernouli's equation:
P2/density=P1/density+Velocity^2/2

Volume flow=velocity*area

The OEM inlet would get about 4230 CFM
Your snorkel gets about 2700 CFM, a reduction of about 40%.

That doesn't translate to a 40% reduction in power, but it doesn't really help. It's like your engine is sucking air through a normal straw instead of a McDonalds milkshake straw. It's just a little difference in size, but it makes a pretty big difference. Food for thought

March 2014 GCOTM. 1998 Deep Slate 5.9
On the Jeep:Hot intake, 52mm TB, Summit 8mm wires, catch can, 703s, insulated fuel rails, indexed Champions, Bilstein 4600s, Eibach lowering springs, Moog SS, Ironman mounts, Lotek 2GP, lots of gauges, sparkly paint.
In the garage: M1 4bbl
In the works: Addco/Hellwig sway bars, nitrous, full polly bushings, full exhaust, data logging, billet UD pulleys
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post #786 of 2216 Old 05-04-2012, 09:26 PM
toxikmo
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^ which ammo can is that?
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post #787 of 2216 Old 05-04-2012, 10:17 PM
kjg26
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Don't be silly. Mcdonalds gives you spoons for their milkshakes.

Black 1993 YJ 4.0, 5 Speed
Slowly but surely getting better and better. Trailer build soon!!
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post #788 of 2216 Old 05-04-2012, 10:34 PM
rdsk8ter
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Quote:
Originally Posted by McCloudsWJ View Post
Bernoulli equation says you might be suffering more than you think you are.

Assuming:
-The air in your intake is incompressible
-Pressure at the TB inlet is approximately 50 psi
-Pressure at the inlet to your snorkel is 14.7 psi (atmospheric)
-Inlet velocity for the air is 10 ft/s (this value doesn't really matter for the answer--it's an arbitrary value)

If the OEM diamater is 2.5", then the area is 4.909 in^2
If your snorkel diameter is 2", then the area is 3.142 in^2

Bernouli's equation:
P2/density=P1/density+Velocity^2/2

Volume flow=velocity*area

The OEM inlet would get about 4230 CFM
Your snorkel gets about 2700 CFM, a reduction of about 40%.

That doesn't translate to a 40% reduction in power, but it doesn't really help. It's like your engine is sucking air through a normal straw instead of a McDonalds milkshake straw. It's just a little difference in size, but it makes a pretty big difference. Food for thought
you lost me at assuming

here is my build threads
http://www.jeepforum.com/forum/f22/randys-long-build-1161262/
http://www.jeepforum.com/forum/f104/randys-offroad-trailer-1164102/
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post #789 of 2216 Old 05-05-2012, 02:47 AM
Thomahawk
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Quote:
Originally Posted by kjg26
Don't be silly. Mcdonalds gives you spoons for their milkshakes.
Not in Norway.

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post #790 of 2216 Old 05-05-2012, 02:59 AM
Shoot1stAskL8r
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I'm not sure why (other than simplicity of the equation) you would ever assume that the air inside the intake is incompressible, because that's far from the truth. And showing a 40% drop of flow from 4500 CFM to 2700 CFM doesn't necessarily mean it will suffer, although that reduction would only be for a 2.5" to 2" inlet, the added bends in the pipe, plus the added friction down the length of the pipe could drastically reduce the true flow even further.. But IF at peak intake/RPMs the engine only required 1500 CFM in order to adequately perform, it may not matter whether he had a 3" open inlet or a 2" corregated pipe. Probably have to dyno it to know the true answer to whether there is any loss in power, but I'd say that if he runs it and doesn't have any noticeable change in power or fuel economy, it probably isn't that big of a hinderance on the engine.

Better to be Judged by 12 than carried by 6.
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post #791 of 2216 Old 05-05-2012, 01:26 PM
BenJammin
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Well after 2 days and 300 miles... I've found that with the snorkel, and my high flow exhaust... I'm getting better mileage 300 mile on just over 2/3 of a tank, and I'm getting better power, both low end ans midrange, I no longer am pegged trying to keep a 50mph run up a long hill... it stays in OD AR about 2300rpm and even accelerates... I'm pleased with it... plus is sounds like a 12valve Cummins under heavy acceleration
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post #792 of 2216 Old 05-06-2012, 12:10 PM
BenJammin
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The best under 100.00 thing as of right now... was today picked ups gas tanks kid and tcase skid for 30.00... I pretty much stole them!

forumrunner_20120506_141011.jpg
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post #793 of 2216 Old 05-06-2012, 03:32 PM
stu132u
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Quote:
Originally Posted by BenJammin View Post
Well after 2 days and 300 miles... I've found that with the snorkel, and my high flow exhaust... I'm getting better mileage 300 mile on just over 2/3 of a tank, and I'm getting better power, both low end ans midrange, I no longer am pegged trying to keep a 50mph run up a long hill... it stays in OD AR about 2300rpm and even accelerates... I'm pleased with it... plus is sounds like a 12valve Cummins under heavy acceleration
Keep us posted on the MPG's and performance of this snorkle. I actually have a design (patented) that doesn't require drilling in the side of the jeep.
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post #794 of 2216 Old 05-06-2012, 03:37 PM
calrain07
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Quote:
Originally Posted by McCloudsWJ View Post
Bernoulli equation says you might be suffering more than you think you are.

Assuming:
-The air in your intake is incompressible
-Pressure at the TB inlet is approximately 50 psi
-Pressure at the inlet to your snorkel is 14.7 psi (atmospheric)
-Inlet velocity for the air is 10 ft/s (this value doesn't really matter for the answer--it's an arbitrary value)

If the OEM diamater is 2.5", then the area is 4.909 in^2
If your snorkel diameter is 2", then the area is 3.142 in^2

Bernouli's equation:
P2/density=P1/density+Velocity^2/2

Volume flow=velocity*area

The OEM inlet would get about 4230 CFM
Your snorkel gets about 2700 CFM, a reduction of about 40%.

That doesn't translate to a 40% reduction in power, but it doesn't really help. It's like your engine is sucking air through a normal straw instead of a McDonalds milkshake straw. It's just a little difference in size, but it makes a pretty big difference. Food for thought
Booyah!! PHYSICS

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post #795 of 2216 Old 05-06-2012, 06:37 PM
liveflatout
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Got a RC dual steering stabilizer for $70.00 and broke it down and painted it with paint I had laying around. Will post pics when it is together tomorrow.
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