K100G flames for first start for the day (diesel)
#1
Thread Starter
K100G flames for first start for the day (diesel)
Hi All,
I am running 2 Kingtechs on Diesel. A 140 and 100.
The 140 starts and runs perfect all the time.
The 100 always has flames on the first start of the day when the engine is cold. When I go flying here I usually have 4-6 flights with less than 10 minutes between flights. This is just so I can beat the summer heat as its too hot to fly after about 7.30 in the morning.
So the engine never really cools to ambient.
The flames are excessive and I would like advice on the setting I should be altering. After the first start the rest are perfect.
Here are some of my settings -
rpm ignition - 2k
pump power ignition - 17
rpm preheat 6k
preheat fuel - 17%
Any advice appreciated.
Regards,
Paul.
I am running 2 Kingtechs on Diesel. A 140 and 100.
The 140 starts and runs perfect all the time.
The 100 always has flames on the first start of the day when the engine is cold. When I go flying here I usually have 4-6 flights with less than 10 minutes between flights. This is just so I can beat the summer heat as its too hot to fly after about 7.30 in the morning.
So the engine never really cools to ambient.
The flames are excessive and I would like advice on the setting I should be altering. After the first start the rest are perfect.
Here are some of my settings -
rpm ignition - 2k
pump power ignition - 17
rpm preheat 6k
preheat fuel - 17%
Any advice appreciated.
Regards,
Paul.
#2
If it only flames on the first start of the day, have you considered maybe the engine could get flooded during transportation to the field? It shouldn't happen because of the solenoids, but it may be worth checking out.
#3
Thread Starter
Hi Mauryr.
I had considered this. Don't think it is the case though as I have a manual fuel valve that I always shut after flight.
Thanks for your suggestion though.
Paul.
I had considered this. Don't think it is the case though as I have a manual fuel valve that I always shut after flight.
Thanks for your suggestion though.
Paul.
#4
Well, worth a try
Sorry it wasn't the problem!
What is weird is that it doesn't do it again in the next start. By my experience, once the parameters are set correctly, startup sequences are consistent.
Since you think the engine being cold could be an issue, did you check if the ignition and the preheat phase take much longer in the first start?
If they do, it is possible that lowering the pump value a little and eventually raising the % from the main injectors to compensate could help.
This change works when you can observe a slow build up of flame during the pre-heat phase (starts with no flame or very little then slowly grows and drips fuel from the tailcone).
Hope this can help
Sorry it wasn't the problem!
What is weird is that it doesn't do it again in the next start. By my experience, once the parameters are set correctly, startup sequences are consistent.
Since you think the engine being cold could be an issue, did you check if the ignition and the preheat phase take much longer in the first start?
If they do, it is possible that lowering the pump value a little and eventually raising the % from the main injectors to compensate could help.
This change works when you can observe a slow build up of flame during the pre-heat phase (starts with no flame or very little then slowly grows and drips fuel from the tailcone).
Hope this can help
#5
Thread Starter
Hi Mauryr.
Yes the ignition and preheat phase does take longer on the first start. I always figured this was because the engine was cold on the first start and it took longer to get to the ramp EGT.
I will try changing the values as you have suggested and see what happens.
I was actually thinking about your first post and something came to mind.
When I finish flying for the day I drain the tanks and then disconnect the wing from the main tank. I then plug the main tank with a festo fitting.
The aircraft then gets placed on the back of my ute and taken home. This is in the hot sun.
I am wondering if pressure is building in the tank as the air heats and forcing fuel to the engine. Like I said there is a fuel valve inline (and engine solenoid) but this would only have to leak a small amount for enough fuel to get to the engine and cause a hot start the next week.
Anyway I will try leaving the plug out next time and see what happens.
Regards,
Paul.
Yes the ignition and preheat phase does take longer on the first start. I always figured this was because the engine was cold on the first start and it took longer to get to the ramp EGT.
I will try changing the values as you have suggested and see what happens.
I was actually thinking about your first post and something came to mind.
When I finish flying for the day I drain the tanks and then disconnect the wing from the main tank. I then plug the main tank with a festo fitting.
The aircraft then gets placed on the back of my ute and taken home. This is in the hot sun.
I am wondering if pressure is building in the tank as the air heats and forcing fuel to the engine. Like I said there is a fuel valve inline (and engine solenoid) but this would only have to leak a small amount for enough fuel to get to the engine and cause a hot start the next week.
Anyway I will try leaving the plug out next time and see what happens.
Regards,
Paul.
#7
Thread Starter
Thanks FenderBean.
I will check all my lines and do a throttle re-learn.
Paul.
I will check all my lines and do a throttle re-learn.
Paul.
#8
Hi Mauryr.
Yes the ignition and preheat phase does take longer on the first start. I always figured this was because the engine was cold on the first start and it took longer to get to the ramp EGT.
I will try changing the values as you have suggested and see what happens.
I was actually thinking about your first post and something came to mind.
When I finish flying for the day I drain the tanks and then disconnect the wing from the main tank. I then plug the main tank with a festo fitting.
The aircraft then gets placed on the back of my ute and taken home. This is in the hot sun.
I am wondering if pressure is building in the tank as the air heats and forcing fuel to the engine. Like I said there is a fuel valve inline (and engine solenoid) but this would only have to leak a small amount for enough fuel to get to the engine and cause a hot start the next week.
Anyway I will try leaving the plug out next time and see what happens.
Regards,
Paul.
Yes the ignition and preheat phase does take longer on the first start. I always figured this was because the engine was cold on the first start and it took longer to get to the ramp EGT.
I will try changing the values as you have suggested and see what happens.
I was actually thinking about your first post and something came to mind.
When I finish flying for the day I drain the tanks and then disconnect the wing from the main tank. I then plug the main tank with a festo fitting.
The aircraft then gets placed on the back of my ute and taken home. This is in the hot sun.
I am wondering if pressure is building in the tank as the air heats and forcing fuel to the engine. Like I said there is a fuel valve inline (and engine solenoid) but this would only have to leak a small amount for enough fuel to get to the engine and cause a hot start the next week.
Anyway I will try leaving the plug out next time and see what happens.
Regards,
Paul.