HELP PLEASE

[Graham Mac]

im flying a rotax 582 and on take off the engine suddenly loses power and comes back then loses power and comes back again.checked fuel. replaced fuel filters. plugs.and clean fuel.power check on the ground is perfect.and power loss is intermitent.has anyone experienced something similar and could advise possible causes.could it be fuel pump?new diaphram has been fitted.new stator coil and magnet flywheel fitted.can a electronic box fail then work again.??im at a loss as to what it could be...very scary loosing power on take off.any advice????
Cheers
Graham

[Morph]

Start your plane and rev it up to max, switch both mags off and then back on again before the motor stops, i.e. 1/2 sec etc. Note the engine does not immediately die, takes a few secs. Now is this the same sensation as you are getting in the air? If so then your problem is electrical with the Ducatti ignition system

With fuel problems the motor won't suddenly die. It will be a more gradual loss of power, i.e. a few seconds more as opposed to 2-3 seconds. I have had fuel starvation problems before and the motor starts loosing power, coughing and farting. Switching an electric pump on doesn't suddenly bring it back to life either, takes a few seconds more of coughing and farting and then comes back up.

Hope this helps

[Graham Mac]

thanks Morph
im up for any advise i can get right now

[REDROMAN]

Had the same expierience at one stage.Found a piece of silicone in one of the jets.Dont know where it came from,but it happened.

[Graham Mac]

Hi REDROMAN...We have cleaned carbs jets needle n seat..am replacing on both carbs just as a precaution.i think we may have found the problem...still to test..we managed to get the engine to loose power on ground test and found after switching both mags off immediately,that one carb bowl was dry of fuel.checked pump..nothing wrong..then noticed vacuum pipe from pump to sump kinked..restricting vac flow.rerooted pipe and tested..reving normaly again.have not test flown yet but will see after carb service
Thanks for the input..much appreciated
Cheers

[Duck Rogers]

then noticed vacuum pipe from pump to sump kinked..restricting vac flow

Graham, not sure what you mean by "vacuum pipe from pump to sump"
Are you referring to the pulse line? From the engine to the pump? If so, then both bowls would/should have been empty as this pipe is what makes the pump "tick"
You wanna phone me? I have a theory for you. Or drive round the corner for a chat about it.
0825533295

[Graham Mac]

thanks Duck ill call you to set up time to meet
Cheers
Graham

[LarryMcG]

Use a long runway, and the whole thing!!

Good luck

LM

[John Boucher]

Had a similar experience with my 582. As Morph mentioned my problem lay with the Ducati coils. One of the wires had burnt off inside at the base of the Ducati Male/Female connector. Everything checked out fine doing checks, did a game count and in flight when we trurned out left and climbed the engine would lose power. Straight and level everything normal, same result each time....

I cut the connectors off and replaced with a different connector system! Problem solved.... Hope this helps!

[Graham Mac]

thanks bad nav
i will check out the connector on the ducati coil..it is a bit suspect as one of the wires the insulation/plastic coating has gone a bit soft/spongie
thanks for the advise
Graham

[John Boucher]

Graham

Let us all know what transpires....

[Graham Mac]

Will do John
we will put new carb components in on friday and test fly....hope it solves problem
will check ducati box connections and hold thumbs
if you dont hear from me after that..youll know it didnt work

Graham

[vernon11]

Hi Graham Mac.
I had the same problem. on several accasions I found one bowl empty. It was really nerve racking. I fitted new pump kit. Float needles. Fuel pipes. The problem seems to have been solved. Still don't know what the cause was.
Cheers.

[Graham Mac]

Thanks vernonII
im going down the same route
Cheers for the input
Graham

[Boer]

Hey Mac,
Have you got fuel in the fuel tank?