Flames

[kb27_99]

Any of you aircraft guys notice flames coming out of your pipes at night?


Just wondering because i just noticed them last night while fogging. At WOT it throws a pretty 1 1/2 foot blue flame out of each pipe.





Kevin

 

[Cajun Airboater]

That is normal. I have seen it on numerous other aircraft engines at night. I think it is due to us running the carburators so rich.

 

[PredatorI0540]

Most all aircraft motors shoot blue flames, its normal, i havent seen one that hasnt... Looks awsome to me!

 

[kb27_99]

I thought it was normal also but the reason I asked is because a friend of mine has a 0540 angle valve that doesn't.


Kevin

 

[Anonymous]

Just seems like something wrong with flames shooting out of my motor. I'd rather have pipes

 

[duckluv26]

i like em....never need a cigarette lighter!!!!! as long as their blue and not orange.

 

[frank w.]

so how bad is orange

 

[Waterthunder]

Most people think flames out the exhaust means it’s running lean but the fact is that is a motor running too rich. The flames come from un burnt fuel that was not completely burned during combustion. When the fuel reaches a hot header or more oxygen the heat from the exhaust ignites the remaining fuel. The colors are like always yellow is hot red is hotter and blue is hottest. These colors just don’t mean how much fuel is burnt it shows how hot the burn is because if you have a header leak it’s just like adding oxygen to a torch. If your aircraft is flaming out the pipe that’s normal because you must run them aircrafts rich in order to cool the cylinders especially in an airboat. Now when your header tube is glowing red all they way back to the head then you better give her a break.

 

[frank w.]

Waterthunder
I HAVE A 220 NEW TO IT ALL AND WAS RUNNIG THE OTHER NITE AND FLEX PIPE WAS GLOWIN JUST PAST HEADERS AND ONE JUGS THE HEADER PIPE WAS GLOWING JUST BELOW THE JUG ONLY THAT ONE IS THIS A PROBLEM STARTING AND MY FLAME IS ORANGE

 

[PredatorI0540]

were you running your boat hard, or just crusing? What was the oil temp?

 

[frank w.]

HARD 2500 FROM HERRYS HOUSE BOAT TRAIL TO SWEETWATER BOAT RAM-P NONE STOP RAININ CAME FROM BULLDOZER NONE STOP OIL TEMP185

 

[Anonymous]

i like em....never need a cigarette lighter

Just don't smoke and you won't need a lighter or flames :roll:

This thread reminds me of the top fuelers. They burn about 50% of their fuel, the other half goes out the pipes, resulting in the spectacular flames you see. This is done to keep the engines cool. Their fuel costs about 50 bucks a gallon and they use up around 20 gallons of it to go 1/4 mile. :shock:

BUT, a top fueler has tuned length pipes; airboats usually don't and would actually benefit from a closed exhaust system.

As for cooling, I suppose it helps the aircooled engines a lot to run rich, just like the dragsters do