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torgemor(at)online.no
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 Posted: Wed Jun 14, 2006 11:13 am Post subject: Mikuni fuel pump installation position was: More 582 Tempe |
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Hi Guy,
Very nice airplane!
Thought I'll warn you about installing the Mikuni pump in horizontal
position with the "bleeding hole" down, cause this is wrong!!!
The Mikuni pump shall be installed as it is in your plane, vertically with
the texture right readable, this is the right position.
The reason, half of the inlet camber will contain entrapped air, almost
half of the pressure camber also contain entrapped air, this will reduce
very much the efficient of the pump.
This pump contain four different "working" cambers, plus two buffering
cambers the latter smoothening out the peak pressure from the pump.
Then to the bleeding hole in the pulse input "nipple elbow", this hole is
meant to bleed out a little mixture plus eventually collected air moisture
- this is to avoid internal corrosion inside the dry pulsing camber.
Vertical installed Mikuni pump (the round type) is the position that there
is less entrapped air, and is the position where the pump is most
efficient.
Torgeir.
| Quote: | > I noticed something in your picture that I think it wrong. Your fuel
> pump is mounted on it's side and should be mounted flat with the pulse
> line
> on the bottom. I've read this in several articles and not sure how
> important it is. I've seen a batch of ultralights with the pump
> mounted on
> it side.
Yes. I've heard about this. The micro drain for the pulse pump is in the
input elbow which enters the center of the back side of the pump. Thus,
with the pump sideways the pressure side of the pump will eventually
fill with fluid to half way, possibly reducing the efficiency of the
pump. (I haven't decided if it will, as theoretically the pump would
work even full of fluid, but with some reduction in efficiency caused by
the increased fluid friction of the liquid.) However, the hole for the
drain is so small, (so as to minimize the pulse loss,) that I have
serious doubts it would drain fuel if horizontal! (Small hole syndrome.
 Of course, once the pulsing started it would probably spit out any
fuel in that cavity.) Unfortunately my pump was mounted when I got the
aircraft; It's what Skystar recommended; no SB or SL's come out about
it; and many others have mounted them the same way. I think I will
replace the input elbow with one with no hole, then drill a similar
sized hole in the bottom of the pulse cavity - same effect, vertical
mount.
> Just curious as to why you need to do another hours worth of high
> speed
> engine running???
I want to check the extreme climb, empty tank flow and the extreme
descent, empty tank time to exhaustion.
Guy Buchanan
K-IV 1200 / 582-C / Warp / 99.9% done, thanks mostly to Bob Ducar.
http://www.matronics.com/Navigator?Kitfox-List
http://wiki.matronics.com
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dosmythe(at)cox.net
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| Posted: Wed Jun 14, 2006 1:06 pm Post subject: Mikuni fuel pump installation position was: More 582 Tempe |
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http://www.ultralightnews.com/safety_bulletins/mikunipump_mount.htm
http://www.recreationalmobility.com/cgi-bin/recreation/RotaxTips.html
Torgeir,
The above two web sites talk about mounting the fuel pump horizontal
(weep hole down) and give a little reasoning as to why. Their reasoning
sort of makes sence to me. In the past I have detected a bit of oil/fuel
from that weep hole. Are you saying that a horizontal mount it wrong?
Where did you get the mounting instructions saying that vertical is correct?
I'm curious because I always thought I had mine installed correctly. This
has become an interesting topic to me.
Thanks,
Don Smythe
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torgemor(at)online.no
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| Posted: Wed Jun 14, 2006 4:34 pm Post subject: Mikuni fuel pump installation position was: More 582 Tempe |
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Hi Don,
Well, there is not such an instruction as far as I'll know for the Mikuni
(I've searched Mikuni web sites to find info about the horizontal mounting
but never found such info), however, if you study the pump this is easy to
figure out. When the pump is in function, the air must escape through "top
mounted" valves. I.E. when the pump is installed in the proper "working
attitude", the air must be able to escape through the pump without
collecting up inside the pump. A wrongly installed pump might be a solid
block for fuel feed if evaporation take place.
If there is a collection of condensed water built up inside the "dry"
pulse camber, the only way to get read of such problem is to mount the
pump horizontally, or drill a hole in the lower part of pulse camber as
Gus suggested (and remember to blank the existing "elbow hole"), in order
to have the pump vertical mounted. I've never had any problem with such
condensation -but might be a problem in other places(?).
Well here's my first attachment. The first picture shows the round Mikuni
(DF 52). Here you'll see the inlet at the lower right side. Also the
in/out fittings is marked with arrows.
The next picture show the center part of the pump, the lower part is the
inlet camber with the one way valve directed into the picture, fuel going
from here and into the "wet" pulsing camber on the reverse side of center
unit. The upper camber is the outlet camber, here the fuel is being pumped
from the "wet" pulsing camber via the one way valve going toward us.
You'll see that both valves is located in the top position, allowing air
to escape easily. If this pump is installed horizontally, the air must go
downward to escape the camber- so if we can do that...
I've got a picture of both, the "wet" pulse camber and the dry pulse
chamber, but in order to keep attachment size at minimum, I skipped two
pictures, however can send them if needed.
Just a little note here; as you can see there is space to install a third
pressure outlet right on the top of the center unit, this will make the
pump even more efficient.
Torgeir.
On Wed, 14 Jun 2006 17:03:11 -0400, Don Smythe <dosmythe(at)cox.net> wrote:
[quote]
http://www.ultralightnews.com/safety_bulletins/mikunipump_mount.htm
http://www.recreationalmobility.com/cgi-bin/recreation/RotaxTips.html
Torgeir,
The above two web sites talk about mounting the fuel pump horizontal
(weep hole down) and give a little reasoning as to why. Their reasoning
sort of makes sence to me. In the past I have detected a bit of
oil/fuel from that weep hole. Are you saying that a horizontal mount it
wrong? Where did you get the mounting instructions saying that vertical
is correct? I'm curious because I always thought I had mine installed
correctly. This has become an interesting topic to me.
Thanks,
Don Smythe
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dave(at)cfisher.com
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| Posted: Thu Jun 15, 2006 3:29 am Post subject: Mikuni fuel pump installation position was: More 582 Tempe |
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Don,
Good heads up on that Fuel pump install. The impulse line should be 12 "
or less as well as heavy wall line that will not collapse under vacuum.
Now I also read about your Kitfox Cowl . Do you have a picture how you re -
directed your exit underneath?
I agree that the original cowl exit dumps mostly into the rad area and I
have thought about re working that area as well.
Dave
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dosmythe(at)cox.net
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| Posted: Thu Jun 15, 2006 3:50 am Post subject: Mikuni fuel pump installation position was: More 582 Tempe |
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I'll try to get pics soon.
Don Smythe
Do Not Archive
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