slpfirehawk415

My chem teacher who was a manager for Chevron was trying to tell me engines only get to around 900 degrees F but I swear when I went to school for auto I thought I remembered my teacher saying that above 4,300 or so degrees NOx are produced like crazy. Can't an ls1 engine with forced induction at WOT get a 4000 degree flame front without pinging? Does anybody know the actual flame temperatures? My book says NOx are the result of combustion temperatures reaching more than 2,500 F.

bww3588

iTrader: (49)

Actual temps in the chamber can far exceed 2500. Hence the reasoning behind the EGR. As you stated, above 2500 temps is when nox is produced. My books show the same things.

96capricemgr

iTrader: (1)

Might discuss circumstances with him. I often find that when two knowledgeable people are disagreeing so drastically on a point they can both be right in one way or another.

I am sure gas burns at different temps be it open flame, cruise, WOT or WOT boosted.
I would narrow the discussion to a particular circumstance.

garygnu

exhaust temps on a dyno pull can surpass 1200*.

Old Geezer

iTrader: (3)

274" stage engine:
@26# boost, 116 race gas, logged egt just before the turbine hsg @ 1600*.
840FWHP. We have logged 1800* on the 1200FWHP engine, at 33#.
As mentioned, get the discussion narrowed down to specifics....

Z28Drifter348

I think compression ratio, fuel type and intake air temperature are a factor with combustion temperatures.
I have noticed on my truck the higher my IAT the quicker my EGTs climb and the higher they go. I have seen them get to almost 1700 before which is normal for a fuel only duramax. I wouldn't imagine a gas motor being any different.

slpfirehawk415

Thanks for the replies guys, always good to hear from everyone. Yea I will talk to him some more on specifics but he was saying I had no sense because the melting point of iron he said was about 2,500. I think the reason it doesn't melt is because it just doesn't have enough time, and also because we use ceramic alloys with higher melting temperatures. I have always wondered what our stock ceramic alloys melt at. Hmm

chrisfrost

iTrader: (8)

Yes You're correct for mild steel to melt 2552 deg need to be at least that consistantly for a few . Heat disperses very quickly .

SSCamaro99_3

iTrader: (1)

I have no doubt the actual burn is very hot, but the trhee revolutions without a combustion event allow a lot of cooling. I wonder if he may be saying that the surface temperatures in the chamber rarely exceed 900F, which woul dbe a much more resonable set of circumstances.

joecar

When a burn proceeds normally (i.e. without detonating) the flame front contains most of the the heat behind it, this keeps the combustion chamber surface temperature lower than the burn temperature, so the melting point of Aluminum (heads and pistons) is not an issue.

wildcamaro

iTrader: (15)

Take a heat transfer course and it will all make sense...