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lgreen1(at)sc.rr.com
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 Posted: Sun Jan 08, 2006 11:28 am Post subject: fuel pump |
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Got a question for you guys running 447 single carb. I got a new mikuni 34b fuel pump with mine and it has two outlets. Did yall just cap off one or tee them together?
Bryan Green (Elgin SC)
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beauford(at)tampabay.rr.c
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| Posted: Sun Jan 08, 2006 5:48 pm Post subject: fuel pump |
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Brother Green:
I believe the "standard" Mikuni furnished with the 447 SC is still the
single outlet rectangular
shaped DF-44... that's what came with mine, anyway...and that is the pump
shown for
the SC engine in the Rotax literature. It is about $20 at Spruce or
Lockwood.
Can't say I recall ever seeing anyone run one of the two outlet pumps on a
SC engine with
one of the ports plugged or the two outlets siamesed together.
Might be OK, but then again, there could be some arcane mismatch in pressure
or flow or somesuch using the 2 carb
pump into 1 carb... Since the "correct" pump costs so little, I'd be
tempted to just go ahead and get one... that
plugged extra port under pressure or additional tee plumbing would be just
one more thing to worry about.
Mebbe you can sell the new 34b to someone with 2 carbs...
Good Luck,
Beauford
FF#076
447 SC
- Original Message -----
Got a question for you guys running 447 single carb. I got a new mikuni
34b fuel pump with mine and it has two outlets. Did yall just cap off one or |
tee them together?
| Quote: | Bryan Green (Elgin SC)
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ElleryWeld(at)aol.com
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| Posted: Sun Jan 08, 2006 8:31 pm Post subject: fuel pump |
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Brian I would think either way would be ok but I have been wrong before and
not afraid to admit it
and this is worth just what you paid for it
Ellery
do not archive
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lgreen1(at)sc.rr.com
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| Posted: Sun Jan 08, 2006 11:43 pm Post subject: fuel pump |
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Beauford John and Ellery
Thanks for the help with the pump question. Do not archive
Bryan Green (Elgin SC)
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N27SB(at)aol.com
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| Posted: Mon Jan 09, 2006 5:10 am Post subject: fuel pump |
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N27SB(at)aol.com
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| Posted: Mon Jan 09, 2006 5:35 am Post subject: fuel pump |
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To All,
I researched this subject last year. FF#447 was purchased from Duane d Plane
with the 2 port pump installed. It had one port plugged. The problem was that
with the 2port pump mounted in the standard position the output port to the
carb is close to the root end of the aileron torque tube during wing fold. On
two occasions this created a pin hole in the fuel line to the carb. I caught
the leak during pre flight both times. I replaced the pump with a single port
and no longer have a problem.
The only negative that I heard was that the single port did not have as good
of seals as the 2 port but I did not confirm that. It could have been a case
of comparing old single port parts to new duel port parts. Travis at TNK told
me that they supply the 2 port because that is what comes with the engine. I
suspect that Rotas went to a 2 port on everything to shorten their part list.
If you are going to use the 2port pump on a Firefly I would suggest that you
make an aluminum plate that moves the pump enough so there is no conflict with
the wing fold operation.
BTW the pin hole is caused when the torque tube hits the end of the output
nipple. This is a very hard leak to spot and it only leaks when there is
pressure on the system.
Steve B
FF #007
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lgreen1(at)sc.rr.com
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| Posted: Mon Jan 09, 2006 6:31 am Post subject: fuel pump |
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Thanks for the info Steve. I have received replies form several people
running these on 447 with a tee so this is the way I'll go. I will be using
it on my original Firestar, so a bracket will definitely be fabricated for a
good location. Do not archive
Bryan Green (Elgin SC)
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