Exhaust makin that rattle. - D-series.org

02-24-2006, 11:14 PM

My exhaust started to make that slight rattle under 2500 rpms yesterday. What the hell is it. I'm replacing the whole thing soon, so I'm not that worried. Just was wondering if anyone knew off the bat.

eg6motion · 02-24-2006, 11:25 PM

your not running a magnaflow cat are you? lol j/k
Most exhaust rattles come from heatshields or broken cats..ie the brick becomes loose.

n00br0 · 02-24-2006, 11:31 PM

does it come from the back?? does your exhaust have rivits?? could be alot of things

02-24-2006, 11:32 PM

I believe it's the cat. Sounds like it's coming from directly beneath me. Have the cat go out, will that roast my exh. valves?

n00br0 · 02-24-2006, 11:37 PM

Quote:

Originally Posted by decev

I believe it's the cat. Sounds like it's coming from directly beneath me. Have the cat go out, will that roast my exh. valves?

if you take it out.you would A.get pulled over for being way to loud (straigh pipe) B.not be able to pass smog. and C. you car would be really smelly. lol

samuraiz · 02-25-2006, 12:08 AM

First, what would the catalytic converter have to do with your exhaust valves?

Second, if your exhaust system has a resonator or a real muffler, you can remove the cat without it being too loud, though it does kinda smell like it's from the 60's. If your state test emissions, don't even think about removing it.

eg6motion is right, it's probably the heat shield or else the honycomb of shit inside the cat is breaking loose which could eventually clog any resonator or glasspack muffler downstream. Unless you've hit the cat on something, i'd bet it's the heatshield. The heatshield would probably sound more high pitch, it is just a small piece of tin(?) vibrating.

02-25-2006, 12:47 AM

With a blocked exhaust flow I could burn valves, right? Even you, samuraiz, stated that the comb could have become dislodged. I'm not removing anything and an entirely new exhaust is going on within 2 weeks, maybe even monday. I just wanting to make sure that 200-700 miles like this will be ok.

ryan89crx · 02-25-2006, 01:00 AM

mine started doing the same thing when i had my stock exhaust on. ended up being the resonator

eg6motion · 02-25-2006, 07:31 AM

Quote:

Originally Posted by decev

With a blocked exhaust flow I could burn valves, right? Even you, samuraiz, stated that the comb could have become dislodged. I'm not removing anything and an entirely new exhaust is going on within 2 weeks, maybe even monday. I just wanting to make sure that 200-700 miles like this will be ok.

You will only burn valves if your exhaust becomes blocked. I just had my cat break apart and get stick in the pipe so I speak from experience. But you WILL definately notice it when that happens. No powa.

jcarp613 · 02-25-2006, 02:55 PM

If it is a honeycomb cat you can smash it and make it hollow. It most likely is a loos heat shield. Crawl under it while its running and find exactly where the rattle is. Good Luck...

samuraiz · 02-26-2006, 12:10 AM

Quote:

Originally Posted by eg6motion

You will only burn valves if your exhaust becomes blocked. I just had my cat break apart and get stick in the pipe so I speak from experience. But you WILL definately notice it when that happens. No powa.

That's what I thought, a substantially blocked exhaust would do more than just make noise.

EG8SIR · 02-26-2006, 03:33 AM

my cat magically fell out when i installed my Greddy Evo Catback but lucky i had a test pipe to fill the gap till i order a new one

but no rice or any werid rattles here

http://media.putfile.com/civ

If you have a nice and long resonator you can get away without having a cat (i also live in FL with no emissions and the jacked up redneck trucks are not only 10x louder but they wouldnt use a cat if someone paid them) on exhaust notes

17secondlx · 02-27-2006, 10:05 AM

the rattle happen several times to me on my ek. They used aluminum to help keep the heat in which is good. They bolted the aluminum to the steel exhaust which is bad.

When dissimilar metals come into contact, one tends to rust... (while the other is protected) it's called galvanic corrosion... and unfortunately the heat shields rust though around the bolts and becomes loose...

It's much more common than say damage to the catalytic converter... So it's more likely to be the heat shield. Fixing the rattle the first two time for me was really easy. After I saw the heat shield that was vibrating, I grabbed the offending bit of metal and promptly burnt my hand... (wait until the car cools down) An hour later I went out and grabbed it again and yanked it out. The next time was just as easy and I pulled out another piece... The last shield though was much more difficult. It has rusted though around two bolts but the other two still had a firm grip on the bit of aluminum. I tried fatiguing the metal by working it back and forth for a good ten minutes, but it was difficult and the metal is sharp, and the bolts catch on your hands and I got cut up a bit. (So don't do this either, especially without proper gloves) I gave up, got the dremel out and cut it off in 30 seconds.

If you get your oil changed at the shop, you can just tell them to rip any of the loose heat shields off... It'll take them a few seconds, and they shouldn't even charge you for it.

samuraiz · 02-28-2006, 11:59 AM

I used Tin snips to remove the bit of heat shield that was vibrating under my car, the sound is back now so I think it's time to break out the snips again. The hardest part for me was Identifying exactly where the noise was comming from. I can only reproduce it around 3.2k rpm when in gear.

02-24-2006, 11:14 PM	#1 (permalink)
decev Guest Posts: n/a	Exhaust makin that rattle. My exhaust started to make that slight rattle under 2500 rpms yesterday. What the hell is it. I'm replacing the whole thing soon, so I'm not that worried. Just was wondering if anyone knew off the bat.

02-24-2006, 11:25 PM	#2 (permalink)
eg6motion D-series soldier iTrader: (2) Join Date: Dec 2004 Location: Colorado Posts: 836 Rep Power: 9 View My Photo Gallery	your not running a magnaflow cat are you? lol j/k Most exhaust rattles come from heatshields or broken cats..ie the brick becomes loose. __________________ 5280ft elevation please donate air http://i74.photobucket.com/albums/i2...otion/sig2.jpg

02-25-2006, 01:00 AM	#8 (permalink)
ryan89crx Lifetime Awesome Member iTrader: (80) Join Date: Dec 2003 Location: Tri-Cities, Washington Posts: 25,557 Rep Power: 434 View My Photo Gallery	mine started doing the same thing when i had my stock exhaust on. ended up being the resonator __________________ My CRX 12.87@109mph Xbox 360 gamertag - TurboDiesel598 Delta Cam, best bang for your buck! http://img.photobucket.com/albums/v2.../made_Ryan.png

02-26-2006, 03:33 AM	#12 (permalink)
EG8SIR D-series PIMP iTrader: (5) Join Date: Feb 2006 Posts: 1,005 Rep Power: 8 View My Photo Gallery	my cat magically fell out when i installed my Greddy Evo Catback but lucky i had a test pipe to fill the gap till i order a new one but no rice or any werid rattles here http://media.putfile.com/civ If you have a nice and long resonator you can get away without having a cat (i also live in FL with no emissions and the jacked up redneck trucks are not only 10x louder but they wouldnt use a cat if someone paid them) on exhaust notes __________________ http://www.pbase.com/minority_report/image/64672006.jpg you know what it is...we fuck spiders in each one of their eyes 1995 Civic 5 Speed, SOHC ZC Vtec, Fake J's Intake, DC Header, Greddy Catback, Street Tuned on the HeebSpeed laptop by myself 15.23@90.66 with a 2.29 60' http://media.putfile.com/sohcvtec1

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02-24-2006, 11:32 PM	#4 (permalink)
decev Guest Posts: n/a	I believe it's the cat. Sounds like it's coming from directly beneath me. Have the cat go out, will that roast my exh. valves?

02-25-2006, 12:08 AM	#6 (permalink)
samuraiz wise in the ways of the D iTrader: (4) Join Date: Aug 2004 Location: Orlando, FL Posts: 1,846 Rep Power: 9	First, what would the catalytic converter have to do with your exhaust valves? Second, if your exhaust system has a resonator or a real muffler, you can remove the cat without it being too loud, though it does kinda smell like it's from the 60's. If your state test emissions, don't even think about removing it. eg6motion is right, it's probably the heat shield or else the honycomb of shit inside the cat is breaking loose which could eventually clog any resonator or glasspack muffler downstream. Unless you've hit the cat on something, i'd bet it's the heatshield. The heatshield would probably sound more high pitch, it is just a small piece of tin(?) vibrating.

02-25-2006, 12:47 AM	#7 (permalink)
decev Guest Posts: n/a	With a blocked exhaust flow I could burn valves, right? Even you, samuraiz, stated that the comb could have become dislodged. I'm not removing anything and an entirely new exhaust is going on within 2 weeks, maybe even monday. I just wanting to make sure that 200-700 miles like this will be ok.

02-25-2006, 02:55 PM	#10 (permalink)
jcarp613 Member iTrader: (0) Join Date: Jan 2006 Posts: 56 Rep Power: 0	If it is a honeycomb cat you can smash it and make it hollow. It most likely is a loos heat shield. Crawl under it while its running and find exactly where the rattle is. Good Luck...

02-27-2006, 10:05 AM	#13 (permalink)
17secondlx Member iTrader: (0) Join Date: Jul 2005 Location: Canada Posts: 60 Rep Power: 0 View My Photo Gallery	the rattle happen several times to me on my ek. They used aluminum to help keep the heat in which is good. They bolted the aluminum to the steel exhaust which is bad. When dissimilar metals come into contact, one tends to rust... (while the other is protected) it's called galvanic corrosion... and unfortunately the heat shields rust though around the bolts and becomes loose... It's much more common than say damage to the catalytic converter... So it's more likely to be the heat shield. Fixing the rattle the first two time for me was really easy. After I saw the heat shield that was vibrating, I grabbed the offending bit of metal and promptly burnt my hand... (wait until the car cools down) An hour later I went out and grabbed it again and yanked it out. The next time was just as easy and I pulled out another piece... The last shield though was much more difficult. It has rusted though around two bolts but the other two still had a firm grip on the bit of aluminum. I tried fatiguing the metal by working it back and forth for a good ten minutes, but it was difficult and the metal is sharp, and the bolts catch on your hands and I got cut up a bit. (So don't do this either, especially without proper gloves) I gave up, got the dremel out and cut it off in 30 seconds. If you get your oil changed at the shop, you can just tell them to rip any of the loose heat shields off... It'll take them a few seconds, and they shouldn't even charge you for it.

02-28-2006, 11:59 AM	#14 (permalink)
samuraiz wise in the ways of the D iTrader: (4) Join Date: Aug 2004 Location: Orlando, FL Posts: 1,846 Rep Power: 9	I used Tin snips to remove the bit of heat shield that was vibrating under my car, the sound is back now so I think it's time to break out the snips again. The hardest part for me was Identifying exactly where the noise was comming from. I can only reproduce it around 3.2k rpm when in gear.

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