Bill,
I missed the earlier part of this thread, but without knowing what you're looking for, here's something you should consider.  Fuel flow transducers are designed to work within a flow range. One that will support a TSIO-550 at WOT needs to efficiently pass and record at least 45 GPH...quite a stream of fuel. The fuel flow on this engine from 1700 RPM on down is in the 4 GPH or less... less than 10% of the rated flow capacity. You should not expect it to measure reliable/accurate flow rates at this very low volume of fuel. Kinda like trying to weigh a feather pillow with a truck scale...

My two cents...

Bob Pastusek
--------------

My thanks to all who helped on this on and special thanks to Dico Reijers for sending a F/F transducer for comparison.

I ran each transducer at RPM varying from 1700 down to idle and recorded fuel flows.

The comparison transducer ran roughly 2.4 % higher at all readings which leads me to believe that the K factor varied  but the reading did compare.

If anyone with a TSIO 550E can give me their fuel flows varying from
1700 on down, I would appreciate it

Regards, Bill Hogarty

P.S. to Dico..  I'll be sending your transducer back to you this week.
 I left connectors attached to the leads but you can
                       cut them off if you prefer.  Thanks again  Bill H.

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