Diesel Volatility
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Post Fiend
Joined: Jun 2006
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From: Central, Al
Diesel Volatility
Got a prob.. Drain vale started leaking a little on monday so i ordered the o-rings. this morning it gets much worse. O-rings should be delivered this afternoon but i have to get home to get them.
what is the chance of the exhaust igniting the leaking diesel while driving (30 miles to get home)?
what is the chance of the exhaust igniting the leaking diesel while driving (30 miles to get home)?
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Joined: Aug 2005
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From: Central Alabama
Alan, I wouldn't worry about it. 
Before I knew there was a drain tube that was supposed to be connected to the bowl, I drained it into the engine valley. 
Don't ask... I never had any issues. I have sense then reconnected that hose.
Before I knew there was a drain tube that was supposed to be connected to the bowl, I drained it into the engine valley. Don't ask... I never had any issues. I have sense then reconnected that hose.
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Post Fiend
Joined: Jun 2006
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From: Central, Al
I made it home, now i cant find my 1/4" ratchet and the valley has eaten 2 T20's so far. Need to let it cool off a little more so I can get my hands in a little better. Will one cycle of the key be enuff to fill the bowl or should I give it a couple of cycles before I crank it up.
Tuned
Joined: Jun 2004
Posts: 275
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From: San Antonio
normally I dont put the lid on until I cycle the key and watch it get close to full, then I spin on the lid, tighten it down and cycle the key again... if you turn off the radio and fan, then listen, you will probably hear a little click about 30 seconds after the wait to start lite goes out... when I hear that click, then I start it up. it also seems to prevent that romping in the winter time as well.
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Post Fiend
Joined: Jun 2006
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From: Central, Al
I gave it 2 cycles and she fired right up Now all I have to do is clean up all that fuel sprayed every where.
Reason I asked in the first place is that the Autoignition Temp of diesel is 494 degrees (so exhaust temps do have the ability to ignite diesel without an ignitionn source) and I know EGT's exceed that but wasnt sure what the actual transfer temp of the header would be with air moving over it
Reason I asked in the first place is that the Autoignition Temp of diesel is 494 degrees (so exhaust temps do have the ability to ignite diesel without an ignitionn source) and I know EGT's exceed that but wasnt sure what the actual transfer temp of the header would be with air moving over it
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From: South Dakota
There were a couple an incidents in the helicopter world where there was a fuel leak, one was sprayin on the engine for about a half an hour before it started on fire and another one was fuel dripping on the motor for over 3 hours and no fire. Difference was one was a mist. Diesel volatility just like jet fuel is more in the vapors, so a high pressure mist is more apt and easier to catch on fire then a drip. That being said a fuel leak is nothing to play around with.
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Post Fiend
Joined: Jun 2006
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From: Central, Al
Diesel's flash point is 248* but its autoignition temp is around 430* and that is well below EGT's. Diesel is fairly safe as long as it is cool and unpressurized.
Flash Point = needs an ingintion source
Autoignition Temp = spontaneous combustion
Flash Point = needs an ingintion source
Autoignition Temp = spontaneous combustion
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