Getting some pretty good gas mileage increase numbers after a snorkel!! - Jeep Wrangler Forum
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Old 06-25-2013, 10:35 PM   #1
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Talking Getting some pretty good gas mileage increase numbers after a snorkel!!

Ive had my Rugged Ridge snorkel installed for about a month and i can say Im getting significantly better gas millage.

Highway millage has gone up from 19.8 +- .2 to a solid 22.5

City driving has gone from 17.5 to 19.7

these numbers are staying pretty consistant. My fuelly average is showing the same % increase after 5 tank refills. Will report back in 3 months what my long term average is.

Ill be honest, I absolutely did not buy the snorkel for the millage, it was for fording water I have to say though this is a pretty nice bonus

Using OEM air filter too, not the high flow filter RR recommends.

for reference; 2012 JK with stock rims/tires and 3.73's w/ Rampage front recovery bumper.

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Old 06-25-2013, 10:37 PM   #2
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Summer gas?

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Old 06-25-2013, 10:38 PM   #3
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Old 06-25-2013, 10:40 PM   #4
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Summer gas?
This. Breathing through a straw is not going to increase your gas mileage.
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Old 06-25-2013, 10:44 PM   #5
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Summer gas?
Nope, We've had summer blend available for a few months now

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This. Breathing through a straw is not going to increase your gas mileage.
straw? thats "Ram Air" Buddy
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Old 06-25-2013, 10:52 PM   #6
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After considering the very small inlet on the stock air intake, I would not be surprised to see an increase in fuel economy... especially with the difference in air temp from outside of the engine compartment.

Any other changes such as fuel type, driving habits which may be assisting as well? Top on or off?
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Old 06-25-2013, 10:57 PM   #7
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Ram Air goes from right above the hood directly into the carb. I highly doubt a snorkel would give the same benefits.
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Old 06-25-2013, 11:06 PM   #8
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While I'm more than a bit skeptical that the apparent increase in MPG is due only to the snorkel and will hold up with time, if it pans out, it would be very interesting. I could foresee Jeep making snorkels standard equipment to get a 12% increase in MPG with such a simple system! But, I sort of doubt that auto engineers would have missed this....

Keep us posted, OP.
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Old 06-25-2013, 11:13 PM   #9
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This. Breathing through a straw is not going to increase your gas mileage.
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After considering the very small inlet on the stock air intake, I would not be surprised to see an increase in fuel economy... especially with the difference in air temp from outside of the engine compartment.

Any other changes such as fuel type, driving habits which may be assisting as well? Top on or off?
Nope, none. Seriously, i am not a guy that believes CAI work, (granted this is about as much of a CAI as you can hope for) especially ones that stay under the hood. I bought it to ford water and not have to worry about it. this is a nice bonus that i thought i would share. Fuelly is showing the same increase so the computer is pretty accurate (within .3%)

I wonder if i put my doors/windows on if my MPG will increase even more? to be fair ill keep the doors/windows out for the rest of the summer and track my mileage!
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Old 06-25-2013, 11:30 PM   #10
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Summer gas . While its been out for a while your probably just now getting it at the pump.I noticed my mpg has just went up in the past 2 weeks.
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Old 06-26-2013, 10:06 AM   #11
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[QUOTE=Saranrap;3899856]Nope, We've had summer blend available for a few months now

Thanks for the pics. Looks great. I've been considering this kit for a while now. How was the install? Any gotchas?

Did you get the low mount kit as well? I would be curious to know if your gas mileage remained the same with the low mount kit installed. No forced inbound air with the low mount kit.
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Old 06-26-2013, 10:20 AM   #12
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Ram Air goes from right above the hood directly into the carb. I highly doubt a snorkel would give the same benefits.
Most hood mounted ram air systems actually reduce performance. The velocity of the air over the hood creates a low pressure area in much the same way that an airplane wing creates lift. This actually reduces the amount of air that gets into the carburetor. You get much better performance from a cowl induction or grille mounted induction system.

Cowl induction which has the opening at the rear of the hood where the windshield starts to come up takes advantage of the higher pressure area where the air builds up as it's forced to change direction. As a side note, that's why you see the intake for the cabin ventilation system right there at the base of the window.

Several real performance cars come with air inlets that are on or below the grille. They take advantage of the pressure front created at the nose of the car which pushes a ton more air into the carburetor than a hood mounted scoop.

Putting a big scoop up high really does a much better job of taking advantage of the ram air effect than a hood mounted "ram air" system like you would have seen on muscle cars.

One of the reasons you see some cars with really tall hood mounted scoops is to do exactly what the snorkel is doing. Getting the air inlet up above the surface of the hood puts the scoop out of the low pressure area and into cleaner air, vastly increasing the ram effect.

But one of the really important things a snorkel gives you is that you go from sucking in hot under-hood air to sucking in air that's much cooler. That cooler air is much more dense and therefore capable of making more power in the engine. Since the engine makes more power with cooler air, you don't have to work it so hard. When you don't have to work it so hard, the mileage improves.
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Old 07-20-2013, 08:14 PM   #13
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my only concern about this snorkel is where it 'bottlenecks' going into the engine compartment. other than that i like this snorkel system the most.
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Old 07-21-2013, 12:09 AM   #14
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But one of the really important things a snorkel gives you is that you go from sucking in hot under-hood air to sucking in air that's much cooler. That cooler air is much more dense and therefore capable of making more power in the engine. Since the engine makes more power with cooler air, you don't have to work it so hard. When you don't have to work it so hard, the mileage improves.
That's what I was thinking. Running Torque, the intake temperatures (stock air box) are reading 150*F+ degrees when the outside temps are around 100*. Snorkels are pretty much the only true cold air intake.
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Old 07-24-2013, 05:19 PM   #15
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Too the comments about it being a small tube or straw like... compare it to the stock intake inlet size. Now factor in all the hot air trapped under the hood. No wonder inc in mpg

Exactly why this is my next mod aswell plus I like splashing h2o
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Old 07-24-2013, 05:40 PM   #16
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There are a couple things to think about on this.

On one hand, any change in direction decreases cfm.
The snorkels intake is at a high pressure area, but is immediately followed bt a 90.
It is sucking in cooler air.

I would say the fact it is sucking in colder air. And since the summer blend has been out a couple months, it has cycled most of the winter gas out of the tanks. Since they never get empty. And the fact that most people never check there tire pressure. And pressure rises when its hot.

Those are my assumptions.
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Old 07-24-2013, 06:10 PM   #17
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I noticed a MPG increase when I removed my hard top....and doors. Less weight.

I could see a snorkel helping "a little bit"....but not +10%.
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Old 07-24-2013, 11:50 PM   #18
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2013 Sahara Unlimited, 3.73, stock 18" wheels/tires......1st trip to work today (48-49 miles each way, Y-town OH - Pittsburgh Int airport).....THRILLED the dash MPG read 22.5 when I pulled in my driveway tonight !! Drove 40-50 mph on 2 lane back roads and used cruise set at 60mph on rt 51 and 376.

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