Solo 2350D won't start

Our Duo's turbo has suddenly stopped working. It spins up ok at 55Kt when decompressed & continues windmilling when the decompression is released. The engine starts after 2 - 3 seconds, runs for 2 seconds then cuts out. After 1 - 2 seconds it starts again & the sequence is repeated. It's as if the rpm cut out is operating (which happens if the revs exceed 6500) but I'm certain that's not happening & have been careful to ensure the speed doesn't exceed 60Kt. Any advice will be appreciated. Thanks, Bill

On Friday, March 20, 2020 at 6:42:42 PM UTC-4, BillT wrote:
Our Duo's turbo has suddenly stopped working. It spins up ok at 55Kt when decompressed & continues windmilling when the decompression is released. The engine starts after 2 - 3 seconds, runs for 2 seconds then cuts out. After 1 - 2 seconds it starts again & the sequence is repeated. It's as if the rpm cut out is operating (which happens if the revs exceed 6500) but I'm certain that's not happening & have been careful to ensure the speed doesn't exceed 60Kt. Any advice will be appreciated. Thanks, Bill

Check for blocked or collapsed fuel lines.
UH

On Friday, March 20, 2020 at 3:42:42 PM UTC-7, BillT wrote:
Our Duo's turbo has suddenly stopped working. It spins up ok at 55Kt when decompressed & continues windmilling when the decompression is released. The engine starts after 2 - 3 seconds, runs for 2 seconds then cuts out. After 1 - 2 seconds it starts again & the sequence is repeated. It's as if the rpm cut out is operating (which happens if the revs exceed 6500) but I'm certain that's not happening & have been careful to ensure the speed doesn't exceed 60Kt. Any advice will be appreciated. Thanks, Bill

Check fuel pump for outlet pressure (not just confirming flow, actually measuring the pressure and compare to spec sheet).

Does sound like a intermittent fuel delivery problem.
How do you start a turbo on the ground?
Thought they were only windwill starts?
Don't know never have had one.

On Fri, 20 Mar 2020 15:42:39 -0700 (PDT), BillT
wrote:

Our Duo's turbo has suddenly stopped working. It spins up ok at 55Kt when decompressed
& continues windmilling when the decompression is released. The engine starts after 2 - 3
seconds, runs for 2 seconds then cuts out. After 1 - 2 seconds it starts again & the sequence
is repeated. It's as if the rpm cut out is operating (which happens if the revs exceed 6500)
but I'm certain that's not happening & have been careful to ensure the speed doesn't exceed
60Kt. Any advice will be appreciated. Thanks, Bill

About 10 years ago I had a similar issue with my Ventus cT (same
engine, but direct drive). Problem turned out to be the impulse fuel
pump diaphragm that had gotten stiff with age. A simple job to replace
(provided you can get the parts). 10 years ago parts were not an
issue, now, I am unsure. I so have photos of the replacement procedure
if interested.

Bob

On Friday, March 20, 2020 at 6:42:42 PM UTC-4, BillT wrote:
Our Duo's turbo has suddenly stopped working. It spins up ok at 55Kt when decompressed & continues windmilling when the decompression is released. The engine starts after 2 - 3 seconds, runs for 2 seconds then cuts out. After 1 - 2 seconds it starts again & the sequence is repeated. It's as if the rpm cut out is operating (which happens if the revs exceed 6500) but I'm certain that's not happening & have been careful to ensure the speed doesn't exceed 60Kt. Any advice will be appreciated. Thanks, Bill

Is the fuel tank vented properly?

Uli
'AS'

At 01:50 21 March 2020, Bob Gibbons wrote:
On Fri, 20 Mar 2020 15:42:39 -0700 (PDT), BillT
wrote:

Our Duo's turbo has suddenly stopped working. It spins up ok at
55Kt when
decompressed
& continues windmilling when the decompression is released. The
engine
starts after 2 - 3
seconds, runs for 2 seconds then cuts out. After 1 - 2 seconds it
starts
again & the sequence
is repeated. It's as if the rpm cut out is operating (which happens
if the
revs exceed 6500)
but I'm certain that's not happening & have been careful to
ensure the
speed doesn't exceed
60Kt. Any advice will be appreciated. Thanks, Bill

About 10 years ago I had a similar issue with my Ventus cT (same
engine, but direct drive). Problem turned out to be the impulse fuel
pump diaphragm that had gotten stiff with age. A simple job to
replace
(provided you can get the parts). 10 years ago parts were not an
issue, now, I am unsure. I so have photos of the replacement
procedure
if interested.







Bob



I think the 5 year check has a replacement for the diaphragm ,so
they are an obvious known fault.

How do you start a Turbo engine on the ground to work on it?
Can you?
Can you Hand Prop it?
It would be nice if they had a fitting to attach a 1/2" drill motor to turn it over.
I, obviously, know very little about these engines, just curious.

On Friday, March 20, 2020 at 6:42:42 PM UTC-4, BillT wrote:
Our Duo's turbo has suddenly stopped working. It spins up ok at 55Kt when decompressed & continues windmilling when the decompression is released. The engine starts after 2 - 3 seconds, runs for 2 seconds then cuts out. After 1 - 2 seconds it starts again & the sequence is repeated. It's as if the rpm cut out is operating (which happens if the revs exceed 6500) but I'm certain that's not happening & have been careful to ensure the speed doesn't exceed 60Kt. Any advice will be appreciated. Thanks, Bill

I have made new diaphragms for a Mikuni pump from 5 mil mylar (artists supplies)
Use the cast plate as a template and melt the screw holes with a soldering iron.
JMF

John does the mylar resist the effects of the fuel or do you find you have replace that diafram frequently?
Dan