Alan,
As Gilles shows, there could be several reasons for your problem. More
to consider. If the condition only appears when the engine is under a
load, consider the ignition module. Sometimes, heat will cause them to
break down, causing a simillar problem to the one you're experiencing.
There's also the possibility of a small hole in the fuel line, before
the fuel pump, causing air injestion. And then there's good ol' vapor
lock. Check the orifice in your return line, for obstructions...
Rman - Baby Blue
123 hours
Gilles Thesee wrote:
> <Gilles.Thesee@ac-grenoble.fr>
>
> sldpileit@aol.com a crit :
>
>> Ok guys and gals, I would love some help with this one. After 15 hrs
>> of great flying my engine has dropped 300 rpm static. and feels like
>> its missing on a climbing crosswind turn. Filters have been chg'd and
>> also the spark plugs. I've had the carbs redone and tanked at rotax
>> in Sebring Florida. I still have the same problem. the engine runs
>> very smooth untill you get in that climbing crosswind turn. Very
>> unnerving. I have also chg'd out the gas (from aviation to car) Still
>> have the same problem. I can reduce the throttle to below 4500 rpm
>> and missing goes away. I have tried to sneak up on the throt tle in
>> straight and level downwind, but the missing returns. I would love to
>> hear from you guys on this one. The tech's at rotax are running out
>> of ideas.
>
>
> Hi,
>
> The fact that the problem goes away when you reduce throttle seems an
> indication of some (partial) fuel starvation. Does the engine shake
> and spit back ?
>
> Have you made sure to rule out any airframe issue ?
> Qty in tank(s)
> Boost pump on or off ?
> Air trapped in lines (I've seen some tortuous fuel line routing)
> Kinked fuel line (some Europas seem to have hose fuel lines between
> tank and firewall)
> Location of pickup relative to tank in a climb
> Swarf/dirt/water in tank
> Blocked pick-up screen
> Blocked tank vents
> Etc...
>
> BTW, what if you don't take that climbing turn, and continue straight
> on ?
>
> Regards,
> Gilles Thesee
> Grenoble, France
> http://contrails.free.fr
>
>
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