rotax 447 engine failure

Re: rotax 447 engine failure

by tim HEYLBUT » 14 years ago

tim HEYLBUT

4 27 0

update,had a new carbie put on and No different...so just bought a newer 447 with carbie and put that in and no change(rough bogging down and rpm fluctuating) so put new prop,no change removed all wiring,no change by pass fuel system no chabge fresh fuel nope,so only leave 1 other thing that remains origanal from purchace,,exhaust ,,ah hello whats this???????????// NO elbow.and exspansion chamber cut and has a 10 inch car exhaust sleeved in and welded ,so longer than standered and now only 2 piece)no elbow) Im guessing that this would upset the tuned pipe??

Re: rotax 447 engine failure

by tim HEYLBUT » 14 years ago

tim HEYLBUT

4 27 0

Ok now getting real peeved!!!!! new exhaust fitted,still bogging doen? should mention with airfilter off it doesnt bog down? it appers to flood when throttle opened fast? I found a old forrum where a feller has the exact same prob,and has not fixed either, every thing I have tried= new engine,new carbie,new exhaust.seperate fuel tank gravity fed to carbie,new carbie rubber,new airfilter,leak test all gaskets,new gearbox,new prop,new engine mounts,DROVE 11 HRS with whole plane to mechanics,he looked at it for 2 days trying everything I have done,No change so mechanic flew in 5 min long circuit and noted a backfire,and revs surge,but said ran fine other than that,he flew again 10 min reported engine slightly surging No back fire an assured me she good to go? So I lined up the runway sat at idle did my departing call ,opened the throttle and she bogged? so quick back off to idle where she cleared opened throttle to full SLOW,and away I went flew a short circuit but definatly revs moving up and down 100-600 rev drop?
PLEASE PLEASE PRETTY PLEASE SOME ONE HELP ME????????????????
I am a carrer for my Pa so dont have $$$$$ to do any more but what eles could I possibly do? I will offer anyone who can solve this 3 month mystry a $100 reward,,I really want to fly my new plane beemn3 months and only got to fly it home ...
please help Me,dessperate and very frustrated,,need sleep!
take it easy guys

Re: rotax 447 engine failure

by Ian Jones » 14 years ago

Ian Jones

2 53 0

Tim,
You have made many changes trying to get some semblance of smooth running. It could have been the exhaust all along so when you fitted the new exhaust, did you return all other adjustments to original positions?

Pud

Re: rotax 447 engine failure

by tim HEYLBUT » 14 years ago

tim HEYLBUT

4 27 0

Hey Pud, how you been? yeh all reset to factory specs,just did an 11 hr drive to benalla Vic with plane and all 3 engines, x2 gearbox, x2 exhaust, x4 carbies ,x2 props the worx and had it looked at by mechanic ,spent 9hrs investigating the bog (flooding) and came up with this is just how the early 447 single carbie points ignition run! He flew it in a long circuit then I flew it (roughest air Ive ever encounted-the type that gets you sweating...so I just did a short circuit and brought her home..Ill get her back in order as we were flying with no cowling and few other things missing and ill fly here and see what happens but still worried? take it easy Pud

Re: rotax 447 engine failure

by Ian Jones » 14 years ago

Ian Jones

2 53 0

Let us know how you go Tim, both here and on aircraft pilots.

Cheers,

Pud.