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Unread 12-26-2013, 07:32 PM   #1
95yj0645
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1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
Posts: 365
Whistling intake

I have a rock-it intake on my straight six and I love the simplicity of it and how well it pulls air BUT it whistles horribly.. It's the most annoying thing ever it has a steady whistle at half throttle which is normally where it's at while driving. Does anyone else have that problem? I don't have the factory intake or I'd put it on. I do have the ribbed elbow though that I can use. Not wanting to source a stock intake on eBay or Craigslist just want to fix what iv got. Thanks!

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Unread 12-26-2013, 09:02 PM   #2
superj
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1987 YJ Wrangler 
 
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Location: corpus christi, texas
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Probably just going to have to live with it
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Unread 12-26-2013, 09:10 PM   #3
lakeobum
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: clinton, mo
Posts: 88
I am sooooo with you on this. I have an aftermarket cold air intake from doing the 4.0 head and injection swap on my 4.2. The whisling drives me crazy. Other than that, it was a great mod. Surely there is some way to tame that sound.
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Unread 12-26-2013, 10:02 PM   #4
95yj0645
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1995 YJ Wrangler 
 
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Location: indiana
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I feel like making my intake longer won't do anything but that I will need something to change the swirling of the air. I'm wondering if putting the ribbed elbow on will help.
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Unread 12-26-2013, 10:21 PM   #5
plym49
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1990 YJ Wrangler 
 
Join Date: Jan 2009
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Any elbows or swirling you add reduces power. Think about it - what is providing the energy to add swirl to the air, or move it past an obstruction? Answer - your motor. If you ask your motor to do more work, you burn more fuel and parasitic losses equate to fewer ponies available at the flywheel.

You might think you have added power or economy, but you haven't.

And if you are running EFI then 'cold air' systems will not add any power, because once you are in closed loop the ECU is going to adjust fueling to stoichiometric anyway.
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Unread 12-26-2013, 10:32 PM   #6
95yj0645
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1995 YJ Wrangler 
 
Join Date: May 2010
Location: indiana
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Plym.. I'm aware of everything you just said .. I am running a Stroker my "cold air" performance Is not what I'm after ill sacrifice whatever gains I have to stop this whistle . The engine I bought already had the intake tubes robbed from it so I went with the rock-it intake I have now for the cost. Now I just want it to stop because I'm about to be driving my jeep 400 miles a week and I'll for sure run myself into a pole if I have to listen to it that long. Just asking if anyone else has had this problem from smooth bore aftermarket intakes, and if there is a way to make it stop.
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Unread 12-26-2013, 10:54 PM   #7
plym49
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Quote:
Originally Posted by 95yj0645 View Post
Plym.. I'm aware of everything you just said .. I am running a Stroker my "cold air" performance Is not what I'm after ill sacrifice whatever gains I have to stop this whistle . The engine I bought already had the intake tubes robbed from it so I went with the rock-it intake I have now for the cost. Now I just want it to stop because I'm about to be driving my jeep 400 miles a week and I'll for sure run myself into a pole if I have to listen to it that long. Just asking if anyone else has had this problem from smooth bore aftermarket intakes, and if there is a way to make it stop.
The whistling is most likely caused by a leak on the upstream portion of the pipes. Could be a pinhole or something not seated properly. If you can't shoot it, a quick workaround is to replace it with a generic aftermarket cleaner.
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Unread 12-27-2013, 07:16 AM   #8
lakeobum
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: clinton, mo
Posts: 88
The only reason I went this route was because there is not room for the stock 92 setup that would go with my FI that I installed. I did do one thing that helped slightly. Took the paper filter off my 2 gallon shop vac and slipped it over the air filter amd taped it tight around the base. Not gone but did help a bit.
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Unread 12-27-2013, 07:24 AM   #9
Siva283
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1995 YJ Wrangler 
 
Join Date: May 2011
Location: Falling Waters, WV
Posts: 3,698
Chack for collapsed vacuum hoses. Mine did this when my vacuum hose that goes from the throttle body to the valve cover collapsed/
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1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

[QUOTE=Magnum;14117863] I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim[/QUOTE]

[QUOTE=ldso;16498409]. It started with a $200 axle, and a few thousand dollars later I was done :)[/QUOTE]

[QUOTE=Luuca;16122017]diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...[/QUOTE]

[QUOTE=Overhead;17658665]this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.[/QUOTE]
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Unread 12-27-2013, 07:26 AM   #10
Cobra Jeep
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1993 YJ Wrangler 
 
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Do you have a bored out throttle body or a stock throttle body?
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'93 YJ 4.0L, AX-15, NP-231HD/SYE, 8.8in rear, OME 2.5 lift, WJ knuckle/brake conversion, hydroboost. Warn M10000 winch. Hope to some day build a stroker for it.

'79 Cherokee Chief, 401 MPFI fuel injection, T-18/D-20 and hydroboost. Otherwise stock.
Future mods: NV4500, NP205, high pinion D60 front and smooth bottom D60 rear, e-lockers front & rear. SOA with 35X12.50's
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