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Old 04-13-2010, 08:16 AM   #1
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Default Drill a hole in your muffler - exhaust experts

http://www.thunderracing.com/catalog...installZ06.pdf

Look at page 4. There is a drain hole in the aftermarket exhaust. Many OEM exhaust (GM-Chrysler) system also have a small hole. It suppose to prolong the life of the muffler.

I never seen it on a Honda OEM muffler. Or on a WS2, Magnaflow, or OBX muffler/exhaust systems.

The by-product of the cat for clean air is water. Water sitting in your muffler can will rot out over time.

Is it a good idea to drill a hole?
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Old 04-13-2010, 08:20 AM   #2
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Default Re: Drill a hole in your muffler - exhaust experts

yay, intentional exhaust leaks!

meh, it'll probably get a layer of carbon/water goo built up over it in a little time and clog up anyway resulting in the muffler still rotting apart.

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Old 04-13-2010, 08:25 AM   #3
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Default Re: Drill a hole in your muffler - exhaust experts

I'll just pay $50 for a new muffler when it's time, thanks. No drilling holes in my muffler.
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Old 04-13-2010, 08:25 AM   #4
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Default Re: Drill a hole in your muffler - exhaust experts

No. The exhaust is hot enough that the water burns out as steam. The amount that stays in is negligible at best and is almost always burned out by the heat.

Whole exhaust > exhaust hole.
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Old 04-13-2010, 08:27 AM   #5
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Default Re: Drill a hole in your muffler - exhaust experts

I just run open header
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Old 04-13-2010, 08:28 AM   #6
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Default Re: Drill a hole in your muffler - exhaust experts

I don't have a muffler on my car..
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Old 04-13-2010, 08:42 AM   #7
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Default Re: Drill a hole in your muffler - exhaust experts

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No. The exhaust is hot enough that the water burns out as steam. The amount that stays in is negligible at best and is almost always burned out by the heat.
That is true. And that's (one of the reasons) why short trips are "bad" for a car.

However, just yesterday there was a chem spill (http://www.kgun9.com/Global/story.asp?S=12297868), and several PI Crown Vics were blocking the road. When it was clear to go, the CVs (with it's engine ideling for hours?) starting to move in front of me as I got there.

There were almost a few cups of water coming out of the pipes. So it made me think.
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Old 04-13-2010, 08:44 AM   #8
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Default Re: Drill a hole in your muffler - exhaust experts

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I just run open header
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Old 04-13-2010, 08:45 AM   #9
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Default Re: Drill a hole in your muffler - exhaust experts

My exhaust already has a hole.

Wait, muffler?
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Old 04-13-2010, 08:46 AM   #10
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Default Re: Drill a hole in your muffler - exhaust experts

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I just run open header
You must not live within a mile of anyone.
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Old 04-13-2010, 08:48 AM   #11
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Default Re: Drill a hole in your muffler - exhaust experts

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My exhaust already has a hole.

Wait, muffler?
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Old 04-13-2010, 08:49 AM   #12
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Default Re: Drill a hole in your muffler - exhaust experts

This is already a popular mod amongst honda wagovan owners or any hondas with the transverse muffler and there have been pictures of a ton of water just draining out.
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Old 04-13-2010, 09:21 AM   #13
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Default Re: Drill a hole in your muffler - exhaust experts

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Originally Posted by GoLowDrew View Post
http://www.thunderracing.com/catalog...installZ06.pdf

Look at page 4. There is a drain hole in the aftermarket exhaust. Many OEM exhaust (GM-Chrysler) system also have a small hole. It suppose to prolong the life of the muffler.

I never seen it on a Honda OEM muffler. Or on a WS2, Magnaflow, or OBX muffler/exhaust systems.

The by-product of the cat for clean air is water. Water sitting in your muffler can will rot out over time.

Is it a good idea to drill a hole?
If the muffler is made out of steel, a hole drilled afterwards will serve as a breach in the corrosion pretection, which will serve as a nucleation point for corrosion. A factory drilled hole should have corrosion protection on it.

The condensation problem is the worst in winter, especially when a car is driven on short trips. If the exhaust is fully warmed and the car is occasionally driven hard, the condensed water should blow out of the muffler.

Is this about the van?
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Old 04-13-2010, 09:25 AM   #14
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Default Re: Drill a hole in your muffler - exhaust experts

No hole in my muffler.

<-- original stock 16-yr old muffler GS-R, still rust free! Most of the piping under the car is original, too.
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Old 04-13-2010, 09:25 AM   #15
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Default Re: Drill a hole in your muffler - exhaust experts

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Originally Posted by SilentEdge View Post
No. The exhaust is hot enough that the water burns out as steam.

Depends where the water is. It may be steam before the cat where the temperature is hottest, but once it's inside the muffler baffles, it goes back to liquid form if the exhaust isn't hot enough.
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Old 04-13-2010, 09:34 AM   #16
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Default Re: Drill a hole in your muffler - exhaust experts

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Originally Posted by GoLowDrew View Post
The by-product of the cat for clean air is water. Water sitting in your muffler can will rot out over time.

Is it a good idea to drill a hole?
Um, no, it isn't a by-product of the cat, it's a by-product of the combustion of hydrocarbons. ALL hydrocarbons do this when burned, which is why modern high-efficiency furnaces, boilers, and water heaters are called "condensing" units. Just sayin'
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Old 04-13-2010, 09:39 AM   #17
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Default Re: Drill a hole in your muffler - exhaust experts

uhhh condensing units produce water because of the refrigerant pipes passing through a heat exchanger, which causes the moisture in the air around it to condense into liquid form. It has nothing to do with combustion. In fact, condensing units on split HVAC systems do not involve combustion of any kind. This is what the little tube is for underneath your engine that drips water after driving with the A/C on.

I work in an architecture office and work closely with mechanical engineers and see buildings being built every day, and I have NEVER heard a furnace, boiler, or water heater referred to as a "condensing" unit.
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Old 04-13-2010, 09:44 AM   #18
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Default Re: Drill a hole in your muffler - exhaust experts

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Is this about the van?
Just tossing out ideas for the Accord.
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Old 04-13-2010, 09:50 AM   #19
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Default Re: Drill a hole in your muffler - exhaust experts

My OEM catalytic converter on my motorcycle has a small hole in the bottom of it for this purpose. I trust the engineers of that company.
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Old 04-13-2010, 09:51 AM   #20
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Default Re: Drill a hole in your muffler - exhaust experts

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Um, no, it isn't a by-product of the cat, it's a by-product of the combustion of hydrocarbons. ALL hydrocarbons do this when burned, which is why modern high-efficiency furnaces, boilers, and water heaters are called "condensing" units. Just sayin'
This is correct. If the gas drops below it's dew point, the water condenses and precipitates as a liquid. The high efficiency furnaces extract enough heat to drop the flue gas below the dew point. A cold exhaust system on a car does the exact same thing.
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Old 04-13-2010, 10:02 AM   #21
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Default Re: Drill a hole in your muffler - exhaust experts

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This is already a popular mod amongst honda wagovan owners or any hondas with the transverse muffler and there have been pictures of a ton of water just draining out.

I have a wagovan, when I drilled the hole about a quarter gallon came out. It's not like you can hear a tiny hole in the back portion of your muffler. It doesn't sound like a leaky exhaust.
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Old 04-13-2010, 10:14 AM   #22
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Default Re: Drill a hole in your muffler - exhaust experts

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I have a wagovan, when I drilled the hole about a quarter gallon came out. It's not like you can hear a tiny hole in the back portion of your muffler. It doesn't sound like a leaky exhaust.
Thinking back, my 88 Civic did have a rust spot on the muffler after only about < 8 years. I always thought maybe I scrape it going over a speed bump, while carry my three 200lbs+ friends in the car.
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Old 04-13-2010, 12:20 PM   #23
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Default Re: Drill a hole in your muffler - exhaust experts

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I'll just pay $50 for a new muffler when it's time, thanks. No drilling holes in my muffler.

Every <$100 oem style muffler I have every bought has lasted at most 1 year. I went though 2 before I finally just bought a stainless one, well worth the extra money imo.

The hole drilling makes sense to me though. The stock muffler on my DC rusted from the inside out. It still lasted 12 years but it did finally give out. If I had the fore sight I may have drilled it because as stated before, cheap oem replacements are always garbage and have never lasted for me.
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Old 04-13-2010, 04:01 PM   #24
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Default Re: Drill a hole in your muffler - exhaust experts

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I work in an architecture office and work closely with mechanical engineers and see buildings being built every day, and I have NEVER heard a furnace, boiler, or water heater referred to as a "condensing" unit.
So what exactly do you do there?

Tjbizzo is correct.

Byproduct of combustion is water.

the 90%+ furnaces and boilers are condensing. they use a secondary heat exchanger to bring the combustion gasses below its dew point as stated earlier to extract more heat from the unit.

Maybe his wording was incorrect. Its not actually a "Condensing unit", but a "condensing furnace", or "condensing boiler", or whatever piece of mechanical equipment you're talking about.

Last edited by y7turbo; 04-13-2010 at 04:21 PM.
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Old 04-13-2010, 04:07 PM   #25
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Default Re: Drill a hole in your muffler - exhaust experts

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uhhh condensing units produce water because of the refrigerant pipes passing through a heat exchanger, which causes the moisture in the air around it to condense into liquid form. It has nothing to do with combustion. In fact, condensing units on split HVAC systems do not involve combustion of any kind. This is what the little tube is for underneath your engine that drips water after driving with the A/C on.

I work in an architecture office and work closely with mechanical engineers and see buildings being built every day, and I have NEVER heard a furnace, boiler, or water heater referred to as a "condensing" unit.
you are talking about something completely different. noone is talking about hvac but you. everything in this thread is about the combustion process. i would tell people to take it easy on you and not flame you, but you had to start your post with "uhhh", like we are all so stupid and you must take time out of your genius life to explain to us. you should work a little closer to the engineers, or better yet, work a little further, and dont influence their work.

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