Starting a hot Fuel Inj. engine

[the wizard of auz]

Air will be expelled from the lines and injectors in due course.
Any clearer??

Ok, that might work on some engines, but not all. Lets remember that aircraft injectors work on a negative pressure.... or a pressure diferential, and Diesel injectors use a positive pressure to lift the valve plate and release the pintle.
Hence the High pressure part of the injector pump that diesels have and aircraft don't have. If the air bubble in the injector line in most diesels is big enough, it will just sit in the line and compress and decompress all day without building enough pressure in the injector for it to crack off, and therfore must be bled out from just prior to the actual injector.

Oh, sorry guys.......thread drift.

[belowMDA]

John Deakin covered this at length in his articles on avweb.

http://www.avweb.com/news/columns/182146-1.html

you may have to sift through a lot but it is in there. BTW there is a lot of interesting reading in most of those articles!

the upshot was that this will work for a continental but not lycoming. This was verfied to me by an engineer who had worked on our chieftains and had the misfortune of creating a large and somewhat flamable puddle under the machine while doing an engine run. But for the grace of god no fire occured.

[Woomera]

Thread to current whilst I experiment with this "merge" thingy..........


2 minutes later: Hallelujah!!! The Merge thingy worked.

First thing to work for me all day!!!



Woomera

[chimbu warrior]

I'm with Richo............Lycomings and Continentals are different beasts and require different techniques accordingly.

Other little gems.....on early C310's with augmentor tubes, I was always taught that starting with a tailwind was VERBOTTEN. To prove the point, apparently some dude managed to overprime one one day with a healthy tailwind and succeeded in blowing the cowls off (in my day C310's had IO-470's, the 520's came later).

With any overprimed engine, turn it into wind and let things cool down before trying again (about a one-cup-of-coffee interval). This saves draining the battery and melting the starter. For improved cooling, open the oil access door too (but don't forget to close it again).

If all else fails, get something powered by PT-6's!

[Capt W E Johns]

Tinpis is right on. I've found that just a little squirt of gas down the pipes before start, then full lean until after the engine catches, works really well for the Lycoming 540. It avoids the most common error of over-priming, and if it doesn't start you're sure that it needs gas, rather than a flooding problem.

[the wizard of auz]

Hey Chimbu, I have a IO470V powered old 310 and found the best and fastest way to start it is mixture rich, throttle to idle, press starter button and after one rev, add the prime pump. will start every time, hot or cold and no overfueling or fuel in the augmenters.

[pungamoose]

Flooding it then doing a flooded start works a treat on a 40 degree day out bush...... I find it worst about 20 mins after shut down. Don't flood it too much though or there might be a wee fire.