Today's Message Index:
----------------------
1. 07:38 PM - GRT fuel flow sendor accuracy (jim & terri truitt)
2. 10:18 PM - Dynon remote compasses (John Porter)
Message 1
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| Subject: | GRT fuel flow sendor accuracy |
--> RV8-List message posted by: jim & terri truitt <jimteri1@earthlink.net>
I have an 8A 180 horse carb with the GRT fuel flow sensor and an EIS. It's mounted
on the engine side of the firewall, no heat shield, and with 150 hours, no
problem with it working. Now, for accuracy. The installation instructions
specifies a five inch length of straight fuel line before the sensor and a one
or two inch straight line after the sensor. We installed mine according to instructions.
Then you have to fly several tanks of fuel to figure out the flocal
setting.
Mine always shows a higher fuel consumption than actual (that's better than showing
more fuel than actual). Mine shows about 3 gallons less than actually used
per tank full. Not too bad, but I wish it were more acurate than that.
I noticed early on that the fuel flow reading would always go up with the fuel
pump on, and go down when I turned it off. I spoke to Greg (GRT) about this and
he stated I needed to install a dampener in the line before the sensor. I
have all metal fuel lines and this is part of the problem with the pulses from
the pump causing the variations. As yet, I have not installed the dampener but
instead use the electric fuel pump as little as possible. I keep in mind the
difference in flow readings and actual use that I know is there (it has been
pretty consistent). I am curious to know if the dampener will also produce
more acurate flow readings overall, and then bring the "fuel remaining" reading
more in line with actual use. Too busy flying I guess or I'd have it done.
I also have Van's float type fuel gages. Mine are very accurate when sitting on
the ground engine off. They are pretty accurate in the air, although they move
around a bit when flying, even in smooth air (expected of course). I originally
wanted the flow meter as a more accurate back up to the gages, and I'm
still glad I got it. But I have come to trust the Vans gages and I haven't been
disappointed yet. I use the fuel gages and the "fuel remaining" reading of
the EIS as a cross check on each other. The other thing I like is seeing the
flow rate go down when I lean. It gives me a sort of sense of accomplishment,
like I'm saving some money, but at nearly 3 bucks a gallon, the fuel bills still
sting just the same. Oh well. You know what a hobby is? Something you
spend more time and more money on than you should, but you love it anyway.
Bottom line - I like the EIS flow meter and the Vans gages.
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Message 2
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| Subject: | Dynon remote compasses |
--> RV8-List message posted by: "John Porter" <december29@peoplepc.com>
Hi,
Where are guys putting the Dynon remote compasses? I have seen in the tail and
on the wing access panels but haven't heard of how well they work. Anyone
out there with a system working on a -8?
Thanks,
John Porter
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