Paul Lennemann
----------------------------------------
From: "Ken" <klehman@albedo.net>
Sent: Tuesday, January 31, 2012 2:53 PM
To: rebel-builders@dcsol.com
Subject: (SPAM?) Re: [rebel-builders] Fuel ports into cabin
No impact on the automotive EFI systems that I'm familiar with but ram
pressure may help prevent cavitation depending on any plumbing to the
pump. Others have observed that the ram air adds about 5 inches of head
(makes the tank seem 5" higher).
If this is automotive EFI injection, some 40 psi electric pumps don't
like slugs of air though and there is normally no reservoir like a carb
float bowel which means the engine will also immediately start missing
if the pump takes in a slug of air. I like some kind of header tank with
EFI even if it is only a pint or quart size.
My snorkel vent (inverted J at the wing root) is bent almost straight
down to slow the flow of air in through the crossvent and out MAM's tank
caps. I have no holes in the filler necks but my caps have small
internal vents that seem to let a fair bit of air flow out if the
snorkel faces forward. A richer mixture above the fuel is safer and I
hate to waste fuel vapour or vent that much pollution.
Ken
On 31/01/2012 2:35 PM, Wayne G. O'Shea wrote:
youThat's one for Ken ! But you need it vented no matter what or you'd suck
ontank flat!
----- Original Message -----
From: "Roland Kriening"
To:
Sent: Tuesday, January 31, 2012 2:24 PM
Subject: RE: [rebel-builders] Fuel ports into cabin
My guess is then that the ram air added + pressure would have no impact
inthe fuel injection system, but just vent the tank ( and keep the fuel
neck,the
tank ). Thinking out loud ??
Roland
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Wayne
G. O'Shea
Sent: Tuesday, January 31, 2012 11:15 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Fuel ports into cabin
The issue with "store bought" snorkel caps... they are usually already
bent
and since>you< placed, drilled and riveted the filler neck in place it
probably won't match the correct locking direction for the cap. They're
fine
if you have the caps prior to building so you can orient the filler
airplane!or
willing to try to straighten .. then rebend the ram air tube. The other
issue with them.... don't let the lad at the airport fuel your
likelyThey always think they look neater with the tube facing BACKWARDS !
Yes.. it faces forward and creates a small + pressure which helps keep
fuel
flow even in both wings and more importantly forces it down the line to
the
carburetor. Snorkel scoops are mandatory on a few SCub STC's for more
horsepower = making sure the fuel is being delivered.
I don't like them on the caps.. although it is an easier and more
toplace that they'll get checked for being open / clear of bugs. I prefer
andtee the cross over line and pop a tube up thru the wing root fairing
tobend forward into the air stream. Small piece of brass screen inserted
gaskeep the mud dabbers out.
Wayne
----- Original Message -----
From: "Roland Kriening"
To:
Sent: Tuesday, January 31, 2012 7:23 AM
Subject: RE: [rebel-builders] Fuel ports into cabin
Great, I am going to print and save these instructions. A newbie
question...
does one buy the ram air tube or make one. I have seen them on top of
thatcaps but assume they have been welded on. So just so I understand, the
ram
air tube does need to come up into the airstream. Can I assume then
athe
pressure created by the airstream keeps the fuel from escaping during
discoveredturn. My education continues.
Drew, if you have a pic or two it would really help.
Roland
R56
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Drew
Dalgleish
Sent: Monday, January 30, 2012 10:00 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Fuel ports into cabin
Hi Roland I should expand my answer. I recall you have an early serial
number and not sure which manual you're working from. It was
tankthe hard way that under some circumstances fuel may siphon from one
Soto the other and overboard through the vent hole in the filler neck.
2to break any chance for a siphon a cross vent is installed between the
thetanks. There's a service bulletin covering this. What I have done on
Wayne's advice is install a ram air tube in that vent line and block
thevents on the filler neck. I installed a tee in the vent line between
Iwing and the fuselage With one side sticking straight up. The ram air
tube goes up through the wing root fairing and curves forward into the
airstream. I only installed one vent but many others including Wayne (
Ithink ) have put one on each side. There's also a lot of builders that
have installed ram air tubes in their gas caps. I'm sure that either
solution will work equally well to slightly pressurize the tanks.
On 30/01/2012 5:58 PM, Roland Kriening wrote:
youam
holehave
for
beforethis
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