KR> Fuel tank pick up and vent

[John Martindale]

Given that 32mm is the diameter of the Rochester carb on just one cylinder
(3) bank on the stock car engine, my feeling is that a single 32mm carb
would be too small to feed both banks (6) especially at higher revs. What do
Aerocarb say?

John Martindale
29 Jane Circuit
Toormina NSW 2452
Australia

ph:61 2 6658 4767
m:0403 432179
email:john_martind...@bigpond.com
-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Steven Bedford
Sent: Wednesday, 23 November 2011 1:53 PM
To: KRnet
Subject: Re: KR> Fuel tank pick up and vent

Thanks for your input Joe,

I remember reading somewhere on WW site that the 32 would be ok for a stock 
corvair..snip.

KR> Fuel tank pick up and vent

[John Martindale]

Given that 32mm is the diameter of the Rochester carb on just one cylinder
(3) bank on the stock car engine, my feeling is that a single 32mm carb
would be too small to feed both banks (6) especially at higher revs. What do
Aerocarb say?

John Martindale
29 Jane Circuit
Toormina NSW 2452
Australia

ph:61 2 6658 4767
m:0403 432179
email:john_martind...@bigpond.com
-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Steven Bedford
Sent: Wednesday, 23 November 2011 1:53 PM
To: KRnet
Subject: Re: KR> Fuel tank pick up and vent

Thanks for your input Joe,

I remember reading somewhere on WW site that the 32 would be ok for a stock 
corvair..snip.

KR> Fuel tank pick up and vent

[Steven Bedford]

Thanks for your input Joe,

I remember reading somewhere on WW site that the 32 would be ok for a stock 
corvair.
The carb came with a kr2s project I had purchased and if it doesn't work out 
I will
do something else.  Thanks for the heads up on the vent being near the 
exhaust
stream.  I will check that when I get the engine on but shouldn't be a 
problem.
That is a good note for the rest of us builders out there.

Thanks again,

Steven Bedford
Kr2s

-Original Message- 
From: joe.kr2s.buil...@juno.com
Sent: Tuesday, November 22, 2011 4:21 PM
To: kr...@mylist.net
Subject: Fw: Re: KR> Fuel tank pick up and vent

Steven,I have many memory lapses, Is the 32 mm the recommended size - 
for some reason I thought it was the next size up, I run the 38 mm with 
pretty good success on a 3100 cc.Mine did not come out the bottom of the 
fuselage with the vent just to make sure that if fuel came out the vent it 
didn't get into the hot exhaust stream.For your consideration,Joe Horton

Fw: Re: KR> Fuel tank pick up and vent

[joe.kr2s.buil...@juno.com]

Steven,I have many memory lapses, Is the 32 mm the recommended size - for 
some reason I thought it was the next size up, I run the 38 mm with pretty good 
success on a 3100 cc.Mine did not come out the bottom of the fuselage with the 
vent just to make sure that if fuel came out the vent it didn't get into the 
hot exhaust stream.For your consideration,Joe Horton

-- Forwarded Message --
From: Steven Bedford 

It is a 32mm aerocarb, 12 gallon RR fuel tank, stock cid corvair, and the 
vent is a 5/16" aluminum tube
under the fuselage about an inch bent into the air stream.

Steven Bedford
Kr2s



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KR> Fuel tank pick up and vent

[Steven Bedford]

Thank you for the information,

It is a 32mm aerocarb, 12 gallon RR fuel tank, stock cid corvair, and the 
vent is a 5/16" aluminum tube
under the fuselage about an inch bent into the air stream.

Steven Bedford
Kr2s

Fw: KR> Fuel tank pick up and vent

[joe.kr2s.buil...@juno.com]

Hey guys,Let me see if I convey this with some sort of reasoning. First 
history: I started out with aerocarb set up with a fuel pump and a regulator 
and ram air on a corvair. The fuel tank is vented from the very very top of the 
tank and sloped down hill behind the panel and out the side of the fuselage 
just in front of the wing about 7" up from the top of the wing on the passenger 
side. It is comprised of a 1/4" alum tube inside the tank and to the outside of 
the tank, the vent is then 1/4 " clear tubing to the side of the fuselage and 
then changes back to 1/4" alum. tube. The tube through the side is bent in  
somewhat of an crooked S shape so that it points straight into the slip stream 
of the fuselage. The open end faceing front is flared with the flaring tool 
that would normally  be used to install the flared fittings for a AN-4 flared 
fitting. The fuel pump was removed in favor of gravity feed during first ground 
runs. The ram air was removed as problems showed up during taxi testing. The 
slight ram pressure that the vent tube picks up remains after 6 years and 660 
hours. There is a fuel pressure sensor installed low in the system that reads 
to the tenth's of a pound. It never, even with as low as 2 gallons of fuel 
remaining, reads less than .9# at static. And around 1.4# in flight. I since 
added the fuel flow and installed it upstream of the pressure sensor. The 
pressures dropped but not to what i had calculated them to be. The static with 
low fuel is never below .8# and in flight now operates at 1.2# . The head 
height for pressure is 19" sitting level and certainly less in any climb. I do 
not have any back flow preventer installed and my opinion is something 
mechanical in a line that small is something that will get stuck. I got lucky 
and the pressures are centered around the published required pressures for the 
Aerocarb.Steven, I don't remember you saying what engine or what size carb, or 
header tank. The Aerocarb does work and I can not explain some of the problems 
that people have. Given that statement if i had more money 10 years ago I would 
have installed a ellison. My experinces with auto fuel and the Aerocarb are not 
good either.Joe HortonCoopersburg, Pa.-- Forwarded Message --
From: "John Martindale" <john_martind...@bigpond.com>
To: "KRnet" kr...@mylist.net 
Subject: KR> Fuel tank pick up and vent
List-Post: krnet@list.krnet.org
Date: Mon, 21 Nov 2011 19:07:39 +1100


I've had no experience with Aerocarbs. I suspect it might given they are
reputedly a calibrated "fuel leak" but I don't know. Guess it depends on the
diameter of the vent and thus the amount of pressurisation. Someone else
might chime in or you should contact the manufacturer for the definitive
opinion. A simple vent in a cap will leak if upside in a prang. Use an
aircraft designed one. I think these have some kind of a rubber flap
arrangement that prevents this. Check out Aircraft Spruce.

John

I will be running a areocarb on a corvair engine and was wondering
if running ram pressure into the vent of the header tank will cause a
problem with this carb.  Should I be using just a vented cap instead.


Steven Bedford
Kr2s builder   


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KR> Fuel tank pick up and vent

[John Martindale]

I've had no experience with Aerocarbs. I suspect it might given they are
reputedly a calibrated "fuel leak" but I don't know. Guess it depends on the
diameter of the vent and thus the amount of pressurisation. Someone else
might chime in or you should contact the manufacturer for the definitive
opinion. A simple vent in a cap will leak if upside in a prang. Use an
aircraft designed one. I think these have some kind of a rubber flap
arrangement that prevents this. Check out Aircraft Spruce.

John

I will be running a areocarb on a corvair engine and was wondering
if running ram pressure into the vent of the header tank will cause a
problem with this carb.  Should I be using just a vented cap instead.


Steven Bedford
Kr2s builder   

KR> Fuel tank pick up and vent

[Steven Bedford]

  John Martindale wrote:

" If pointed into wind remember the ram pressure will affect your fuel
 delivery and some carbys are sensitive to this."


I will be running a areocarb on a corvair engine and was wondering
if running ram pressure into the vent of the header tank will cause a
problem with this carb.  Should I be using just a vented cap instead.


Steven Bedford
Kr2s builder   

KR> Fuel tank pick up and vent

[John Martindale]

Consider leakage and fire risk in event you nose over.

Vent needs to loop above and then below the fuel level to prevent this.
Refer Bingalis book.
Don't vent to slipstream or suction can empty your fuel tank.

If pointed into wind remember the ram pressure will affect your fuel
delivery and some carbys are sensitive to this.

John Martindale
29 Jane Circuit
Toormina NSW 2452
Australia

ph:61 2 6658 4767
m:0403 432179
email:john_martind...@bigpond.com

KR> Fuel tank pick up and vent

[John Martindale]

Consider leakage and fire risk in event you nose over.

Vent needs to loop above and then below the fuel level to prevent this.
Refer Bingalis book.
Don't vent to slipstream or suction can empty your fuel tank.

If pointed into wind remember the ram pressure will affect your fuel
delivery and some carbys are sensitive to this.

John Martindale
29 Jane Circuit
Toormina NSW 2452
Australia

ph:61 2 6658 4767
m:0403 432179
email:john_martind...@bigpond.com

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Joe Beyer
Sent: Friday, 18 November 2011 4:38 PM
To: kr...@mylist.net
Subject: KR> RE: Fuel tank pick up and vent


Snip> Your thoughts and ideas are welcomed.

Roger:  Me too emails are discouragedremember you are posting to over
600 members.

KR> Fuel tank pick up and vent

[Rodger]

> I'm about ready to close up my aluminum wing fuel tanks and need some advice 
> on the pick up and vent. These tanks are very similar to those on Mark Jones' 
> website. 
> 1: I'm thinking of eliminating the pick up tube and installing the AN 
> fitting, with a finger screen attached, right near the bottom of the tank. I 
> think this setup would prevent the possibility of a loose pick up tube 
> falling off inside the tank.
> 2: I'm installing the filler/ cap toward the wing tip end of the tank. What 
> are your thought of a simple 1/4" tube attached on the filler neck pointing 
> toward the airstream above the wing like the header tank design in the KR 
> plans? Or should I attach the tube to the filler neck and route it out the 
> bottom of the wing? Which would perform better? Pro and cons?
> Your thoughts and ideas are welcomed. 
> 
> Rodger Nicolls 
> bandenok...@gmail.com
> 
> Blue skies!