Whistling intake - JeepForum.com

 
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post #1 of 10 Old 12-26-2013, 06:32 PM Thread Starter
95yj0645
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1995 YJ Wrangler 
 
Join Date: May 2010
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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!


'95 YJ, 4.6L stroker, Ford 8.8, AX15, SYE, SOA, Cage kit, full armor, 35" MT/R Kevlar's
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post #2 of 10 Old 12-26-2013, 08:02 PM
superj
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Probably just going to have to live with it

I don't feel like working on anything at this time so i sold my yj.
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post #3 of 10 Old 12-26-2013, 08:10 PM
lakeobum
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1989 YJ Wrangler 
 
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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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post #4 of 10 Old 12-26-2013, 09:02 PM Thread Starter
95yj0645
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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.

'95 YJ, 4.6L stroker, Ford 8.8, AX15, SYE, SOA, Cage kit, full armor, 35" MT/R Kevlar's
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post #5 of 10 Old 12-26-2013, 09:21 PM
plym49
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1990 YJ Wrangler 
 
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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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post #6 of 10 Old 12-26-2013, 09:32 PM Thread Starter
95yj0645
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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.

'95 YJ, 4.6L stroker, Ford 8.8, AX15, SYE, SOA, Cage kit, full armor, 35" MT/R Kevlar's
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post #7 of 10 Old 12-26-2013, 09:54 PM
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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post #8 of 10 Old 12-27-2013, 06:16 AM
lakeobum
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1989 YJ Wrangler 
 
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Location: clinton
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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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post #9 of 10 Old 12-27-2013, 06:24 AM
Siva283
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Chack for collapsed vacuum hoses. Mine did this when my vacuum hose that goes from the throttle body to the valve cover collapsed/

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.

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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
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. It started with a $200 axle, and a few thousand dollars later I was done :)
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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...
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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #10 of 10 Old 12-27-2013, 06:26 AM
Cobra Jeep
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Do you have a bored out throttle body or a stock throttle body?

'93 YJ 4.0L, AX-15, NP-231HD/SYE, 8.8in rear, OME 2.5 lift, home made front hub conversion, hydroboost. Warn M10000 winch. Currently building a stroker.

'79 Cherokee Chief, 401 MPFI fuel injection, T-18/D-20 and hydroboost. Otherwise stock.
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