Why is my exhaust air super hott?
08-29-08, 11:12 PM
#1
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Why is my exhaust air super hott?
well i did an oil change 2day n my friend brought to my attention that the air comming from my exhaust is super hott from only being on 10 secs. I hadnt turn my car on since yesterday. So what would cause that an is that an issue?
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08-30-08, 12:31 AM
#8
Don't mess with the variable resistor; you will just screw up your idle. Your car is not running lean at idle. It's an NA rotary. Rich is all it knows. The exhaust gases will be hot no matter how long the car has been running. It's not like there is some cool air mixing around inside the pipes with the expelled gases; that air is gone within the first couple pulses.
08-30-08, 01:45 AM
#10
Zoneman, ALL car exhaust gasses are hot. No matter what car it is, no matter how long it's been running. Exhaust is the end product of a massive explosion, so even the first puff is going to be super hot. Granted, it will be a bit colder than normal on startup due to the rest of the car not having been warmed up, such as the exhaust pipe, the cooling system, the block itself, and will rob some of that heat, which is the intent actually...
All that to say you've more than likely got nothing to worry about. If you really are concerned about it still, get a temperature gauge of some kind that can read that high and stick it in the end of the tail pipe and let us know what you get.
All that to say you've more than likely got nothing to worry about. If you really are concerned about it still, get a temperature gauge of some kind that can read that high and stick it in the end of the tail pipe and let us know what you get.
08-30-08, 02:54 AM
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what kinda car does you friend have? because i don't really know of any car that is ice cold after five minutes if running unless it is a hybrid running on only the batteries. and yeah you shouldn't have anything to worry about rotories for one burn a lot hotter then other cars like i said before.
08-30-08, 09:53 AM
#14
I would say it's only an issue if your header/turbo (if you're NA/turbocharged respectively) is glowing bright orange in the dark after the car has been brought to operating temperature. A very dull orange is probably ok. Like these guys have said, exhaust is hot regardless, and rotaries normally produce particularly high exhaust temps when compared with many piston engines.
08-30-08, 10:48 AM
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I've deleted some ridiculous replies.
First of all, there is in NO WAY enough information to make a determination. Those saying "it sounds like you are running lean" have no way to making that assumption and it is thus completely invalid. Don't jump to conclusions like that which can cause someone to make unnecessary repairs.
Exhaust gasses are hot. It's the nature of an internal combustion engine. Depending on whether you still have cats or not your exhaust could be only warm, or very hot.
First of all, there is in NO WAY enough information to make a determination. Those saying "it sounds like you are running lean" have no way to making that assumption and it is thus completely invalid. Don't jump to conclusions like that which can cause someone to make unnecessary repairs.
Exhaust gasses are hot. It's the nature of an internal combustion engine. Depending on whether you still have cats or not your exhaust could be only warm, or very hot.
08-30-08, 09:14 PM
#18
I wasn't trying to say anything inaccurate, as a matter of fact the first thing i said was that is hard to tell not knowing what super hot is. And as for the idle mixture screw, I wasn't trying to lead him astray I was just telling him that screw controls that. As for telling him that his car is not running lean as others did I feel is wrong, what if he has a vacuum leak, surely that could lean the car out. No one here knows if his car is running rich or lean, not even the op. He really hasn't given enough information to make any definite conclusions. But in all actuality, its exhaust gas, the product of burned gasoline, its gonna be hot.
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