Lots of heat from exhaust - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 06-20-2016, 08:55 PM Thread Starter
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Lots of heat from exhaust

Not sure if this is me or if by design but I have the Dynomax UltraFlo SS exhaust with an xpipe and I just notice that after the car has been running for some time that there is a lot of heat coming from the underside of the car while standing next to it. I had it parked the other day under a tree while detailing it and had it running for about 5 or so minutes and it killed a patch of grass under it.

Does this seem normal for an aftermarket exhaust system?

1996 BBB, 396ci Golen LT4, Yank 3600, TransGo shift kit, 3.73s, P71 MMC driveshaft, CIA Tri-Y Gen II, X-Pipe, Dynomax UltraFlo exhaust, Hotchkis Sway bars & Springs, Bilstein Shocks, UMI extended control arms, ODBI conversion, all installed and tuned by Mike Harris
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post #2 of 11 (permalink) Old 06-20-2016, 10:08 PM
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X pipe hangs lower than stock exhaust because of the drive shaft.

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post #3 of 11 (permalink) Old 06-21-2016, 02:40 PM
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Quote:
Originally Posted by boofers View Post
.......I had it parked the other day under a tree while detailing it and had it running for about 5 or so minutes and it killed a patch of grass under it.

Does this seem normal for an aftermarket exhaust system?
You subjected that patch of grass to a 5 minutes (or so) close encounter with steel pipes that were in the neighborhood of 450 to 500 degrees.

Grass didn't have a chance.

KW

1996 BBB SS, 398ci Solid Roller LT4, TorqHead 24x Conversion


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post #4 of 11 (permalink) Old 06-21-2016, 03:55 PM Thread Starter
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All good points, just didn't remember the stock exhaust giving off that much heat

1996 BBB, 396ci Golen LT4, Yank 3600, TransGo shift kit, 3.73s, P71 MMC driveshaft, CIA Tri-Y Gen II, X-Pipe, Dynomax UltraFlo exhaust, Hotchkis Sway bars & Springs, Bilstein Shocks, UMI extended control arms, ODBI conversion, all installed and tuned by Mike Harris
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post #5 of 11 (permalink) Old 06-21-2016, 07:55 PM
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According to your signature, you have headers as well, and that will put a lot more heat into your exhaust pipes.

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post #6 of 11 (permalink) Old 06-24-2016, 10:30 AM
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Quote:
Originally Posted by KW Baraka View Post
You subjected that patch of grass to a 5 minutes (or so) close encounter with steel pipes that were in the neighborhood of 450 to 500 degrees.

Grass didn't have a chance.

KW

450 - 500 out of the back???

Out of the block, yes. Out of the tails, no way. The heat dissipates greatly along the journey through the mids, mufflers and tails (if equipped with them that is).

I can put my hand behind my tails and not get burned. Were it 450 - 500, my hand would be a crispy brick oven baked pizza.

I'm more inclined to believing the fumes are higher in carbon content which is ruining the grass moreso than heat. Discover what's creating all the excess carbon and you'll be doing both the car and your grass a favor.
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post #7 of 11 (permalink) Old 06-24-2016, 11:20 AM
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Carbon in the exhaust has nothing to do with the dead grass. You have been listening to too many climate change whackos. The heat from the exhaust being close is the only culprit in this scenario. If he has cats on the exhaust, they are known to set brush fires, and could easily kill grass when in close proximity.

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post #8 of 11 (permalink) Old 06-24-2016, 12:04 PM
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Quote:
Originally Posted by Fred Kiehl View Post
Carbon in the exhaust has nothing to do with the dead grass. You have been listening to too many climate change whackos. The heat from the exhaust being close is the only culprit in this scenario. If he has cats on the exhaust, they are known to set brush fires, and could easily kill grass when in close proximity.
Yep, have heard of "horror Stories" of people parking their cars over a pile of Leaves and not knowing this. Only to see their cars burn to the ground cause the Cat(s) was so hot it caught the Leaves on fire. Always be conscious of this especially in the Fall.

Think I remember seeing that the Pypes X Pipe setup sat a little lower on our cars. My H-Pipe on the Flowmaster setup is tucked up pretty well. Considering how close the x-Pipe is to the Cat's, I can see the Pipes X-Pipe being much warmer there than say at the Tail Pipes. Obviously by the time the fumes get that far down the line, the exhaust would be quite a bit cooler at the Tails. But at the lower hanging X-Pipe, this could be a problem that people should be at least aware of. Thanks......

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post #9 of 11 (permalink) Old 06-24-2016, 01:27 PM
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Quote:
Originally Posted by Fred Kiehl View Post
Carbon in the exhaust has nothing to do with the dead grass. You have been listening to too many climate change whackos. The heat from the exhaust being close is the only culprit in this scenario. If he has cats on the exhaust, they are known to set brush fires, and could easily kill grass when in close proximity.
'Sigh and palm face'

The reason I posted up was to help the poster. Nothing else. He could have meant the area beneath where the tails exit and that was where the comment was directed. He could have meant the area beneath the car adjacent to the pipes. No mention was made by the OP. We don't know the actual area beneath or behind the car he's referring to nor do we know what actual stock and/or aftermarket setup he runs. Filling in this info in detail would help us all help him. That is the point, RIGHT? It's no personal slight and it's rather disturbing to see the ongoing trend of long time members who take personal umbrage to things they read way too much into instead of, and again, merely trying to help the OP. This is not a competition. It's a cooperation.

"Climate change"??? Keep drinking your kool-aid, but to inject personal political beliefs into an area of the forum where it simply doesn't belong and has no practical bearing is, well, plain idiotic.

Carry on.
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post #10 of 11 (permalink) Old 06-26-2016, 04:03 AM
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Quote:
Originally Posted by SEO9C1 View Post
450 - 500 out of the back???

Out of the block, yes. Out of the tails, no way......
Where did I say "out of the back" or "out of the tails"? Yep....reading is fundamental.

And I'll pretty much guarantee.....you place a hi-temp thermometer on exhaust pipes right in front of the mufflers after the car's been running a few minutes, it'll be 450 to 500 degrees.

Quote:
Originally Posted by SEO9C1 View Post
.....I can put my hand behind my tails and not get burned......
Wow.....SMH.....damn......

Tell ya what.....go wrap your hands around your pipes after the car's been running for a few minutes.....and report back to us.

KW

1996 BBB SS, 398ci Solid Roller LT4, TorqHead 24x Conversion


1995 DCM SS, LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads, Lingenfelter GT1-1 cam, Headman Mid-length Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ To The Wheels


2014 Chevy SS; 429ci LS3 -- 508HP, 455TQ @ the wheels....After Break-in Dyno & Track Results Pending


Last edited by KW Baraka; 06-26-2016 at 04:11 AM.
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