blue flames???

WANGAN_X · Post by **WANGAN_X** » Fri Jan 27, 2006 10:54 pm

ok i went out and did a lil twisty run last night hitting upward of 140ish and my wife was riding with my buddy behind trying to video me, of course it was a lil to bumpy.

Needless to say.

she said she saw blue flames, white flames and yellowish orange flames. the blue ones and yellowish ones stayed for quite awhile not just a single POP. I know i am pig rich but i just want to make sure i don't have a problem seeing blue flames or white.

Orange is common though

BTW the blue flames were usually at the end of a straight

PS Martin your brakes rock, i highly recommend anyone who hasn't gotten them to get them. after 2 hours of HARD braking still no fade, they did get hot though, they were smoking and red. towards the end they kinda started screeching to, but other than that no issues whatsoever

drwrx · Post by **drwrx** » Mon Jan 30, 2006 4:14 pm

If your running catless, flames of all shapes sizes and colors are not uncommon. I'm also assumeing that you were riding the gas like a mad man to get to 140ish zone. Flame color depends on tempature (both of the flame and the atmoshere in which it is contained) and content of fuel being burned. Go to a top fuel drag run sometime and you will see tons of blue flames (ethanol based race gas) or look at the flame on any natural gas stove. Your blue flames could be a result of winter gas additives, a particulary high temp combustion point, or even the mix of cold dense air at the tail pipe area. The yellow orange flame is the standard color of "no cat" spontaneous combustion that takes place past the combustion chamber. The white is likely a by-product of any water getting vaporized in the mix.

Mr Kleen · Post by **Mr Kleen** » Mon Jan 30, 2006 9:28 pm

^^^ the doctor is IN

WANGAN_X · Post by **WANGAN_X** » Mon Jan 30, 2006 10:12 pm

i was told that white could be a problem but my egt's weren't abnormally high.

and yes riding the gas is an understatement

drwrx · Post by **drwrx** » Mon Jan 30, 2006 10:41 pm

It's possible, however if you don't have an egt gauge, it's just guess work. Most high EGTs come from extended running at lean mixtures. Have you ever seen an afr readout at full throttle? If your running quite lean up top (which is also the most likely place to see your highest boost rating thanks to boost creep) than yes your egts could be extremely high. My EGTs tend to ride high when I'm at partial throttle while on boost. I can watch the needle slowly rise. Once I floor the throttle the temps quickly come back down to the safe zone. Usually, a richer mix tends to keep EGTs lower. The unexpended gas actually cools the temp. However, there have been situations where an extemely rich mixture has contributed to the high EGTs.

WANGAN_X · Post by **WANGAN_X** » Tue Jan 31, 2006 6:21 pm

i do have an EGT gauge, and no i am not lean, not even close after 5.5k my AFR's drop below 10:1

drwrx · Post by **drwrx** » Tue Jan 31, 2006 8:12 pm

OK, so your not running anywhere close to lean.
Could you see your EGT gauge during your run?
Also, where is your EGT probe placed?
There is always the possibility that your extra unspent fuel is combusting outside the chamber near or at the probe location which can cause irregularly high EGTs. While a bit scarry, it is no real danger to your engine.

WANGAN_X · Post by **WANGAN_X** » Wed Feb 01, 2006 1:22 pm

2nd runner. about an 1" from the head.

my EGT's are/were NOT high

drwrx · Post by **drwrx** » Wed Feb 01, 2006 11:02 pm

Sorry, misread your post.
A big fear is blue smoke out of the exhaust.
Much worse than blue flames!

WANGAN_X · Post by **WANGAN_X** » Thu Feb 02, 2006 6:08 pm

very tru, but i have a metal HG so i am not to worried about teh milky oil