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Mike and everyone,
I had the exact same thing happen with that same
brand filter on my Ford V6 in my BD4 installiation. I took me months to figure
out that it was the design of the filter that was causing the problem. The
debris in the cloged filter was so fine I could hardley even see it. The
filters screen was 5 or 10 microns. An expert car racer told me later that they
never use a filter that fine in raceing because even clean auto fuel will clog
it at high power settings.
Robert
Robert Bollinger
MR722 MUM
1000 N.4th
ST
Fairfield, IA 52557
(641)919-3213
----- Original Message -----
Sent: Wednesday, May 05, 2010 6:09
AM
Subject: [FlyRotary] Re: fuel
filters
A little more detail on symptoms that led
you to change filters please? Was this for the 20B?
Yes, this was
on the 20B but it would apply to any installation. Symptoms were
mixture going lean at higher throttle settings. This was a slowly
progressive thing, not a sudden occurrence. Cause was dropping fuel
pressure due to clogged filter. When throttled back, fuel pressure
returned to normal and engine ran fine. This would of course get worse
and worse as the filter became more and more restrictive.
I
don't think this could happen suddenly unless you had a large amount of
foreign matter in the tank. It certainly can't cause the random
intermittent miss that Bill had which started this thread.
Tracy
On Tue, May 4, 2010 at 10:54 PM, Mike Wills <rv-4mike@cox.net>
wrote:
Tracy,
A little more detail on symptoms that led you to
change filters please? Was this for the 20B?
Although I'm not convinced that it was necessary,
for lack of a better answer I replaced my filters after my fuel starvation
episode a while back. I still have no smoking gun that I can point to as the
cause of this isolated incident. Keep waiting for the sudden unexplainable
re-occurrence. Hope when/if it happens I'm near something
landable.
Mike Wills
Sent: Tuesday, May 04, 2010 9:58 AM
Subject: [FlyRotary] Re: fuel filters
" Big fuel filters are essential, especially for those with
composite tanks." I second that. Just had to change out my
nice looking Jegs Billet aluminum filter (with a tiny screen disk filter
inside) for Peterson 600 series fuel filter. This is the filter
between tank and fuel pump, not the high pressure one after the
pumps. Tracy
On Tue, May 4, 2010 at 12:34 PM, John Slade <jslade@canardaviation.com> wrote:
For what it's worth, I've seen the symptoms of a
partially blocked filter and restricted fuel flow while airborne....The
mixture creeps toward lean, the EGT creeps up, fuel pressure is erratic
and moving lower . Tweak the mixture knob toward rich and everything is
fine for 10 mins, then the cycle begins again. Big fuel filters are
essential, especially for those with composite
tanks.
Regards,
John
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