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aerobubba(at)earthlink.ne
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 Posted: Thu May 04, 2006 12:15 pm Post subject: RV-List Digest: 39 Msgs - 05/03/06 |
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Hi Bill-
| Quote: | Is anyone firesleeving the aluminum lines on the engine side of the
firewall?
-Bill
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Yup- I've firesleeved all the fluid lines, save the already-installed prop oil line. If nothing else, firesleeving the Al lines should help with vapor lock issues.
That's my story, and I'm stickin' to it!
GM
Glen Matejcek
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Jim Anglin
Joined: 10 Jan 2006
Posts: 47
Location: Independence, OR (7S5 Airpark)
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| Posted: Fri May 05, 2006 8:07 am Post subject: RV-List Digest: 39 Msgs - 05/03/06 |
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The most important issue in vapor lock is to have the boost pump on =
during taxi and takeoff. Second is insulation (supplied by =
firesleeving). My aluminum lines stop at the firewall fitting. It =
doesn't seem like a good idea to have a solid fuel line in the engine =
environment hanging from one little flair end. As for the boost pump =
issue: I have personal experience here to prove this out since I have =
run auto gas in RV's since my 6 in 91 and had one vapor lock - the fuel =
boost pump was off. I turned it on and took off again immediately with =
no problem. There is also a lot of documentation to bear this out.
Jim Anglin
HR II N144HR
DO NOT ARCHIVE
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_________________
Jim Anglin
HR II N144HR |
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pitts_pilot(at)bellsouth.
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| Posted: Fri May 05, 2006 11:54 am Post subject: RV-List Digest: 39 Msgs - 05/03/06 |
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Jim Anglin wrote:
Jim, depending on the mounting position of the electric boost pump, and
the temperature there, that pump may convert liquid fuel to a vapor on
the first 'suction' cycle. If you have the pump mounted low where it
gets positive pressure from the tank, there probably won't be an issue.
I'm not sure I would turn the pump on and immediately depart. If the
problem still exists, you could be using the fuel in the bowl (speaking
of carbureted engines) to get you clear of the ground until ......
I don't have much experience with fuel injection, but would bet that
injector pressure wouldn't be there with any vapor problem. But I
rather think having the injection boost pump on during taxi may cause
really rich operation. C'mon here, educate me!!!
Linn
| Quote: |
The most important issue in vapor lock is to have the boost pump on =
during taxi and takeoff. Second is insulation (supplied by =
firesleeving). My aluminum lines stop at the firewall fitting. It =
doesn't seem like a good idea to have a solid fuel line in the engine =
environment hanging from one little flair end. As for the boost pump =
issue: I have personal experience here to prove this out since I have =
run auto gas in RV's since my 6 in 91 and had one vapor lock - the fuel =
boost pump was off. I turned it on and took off again immediately with =
no problem. There is also a lot of documentation to bear this out.
Jim Anglin
HR II N144HR
DO NOT ARCHIVE
|
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http://www.matronics.com/Navigator?RV-List |
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Bob Barrow
Joined: 11 Jan 2006
Posts: 29
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Jim Anglin
Joined: 10 Jan 2006
Posts: 47
Location: Independence, OR (7S5 Airpark)
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| Posted: Sun May 07, 2006 8:04 pm Post subject: RV-List Digest: 39 Msgs - 05/03/06 |
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What oil lines would penetrate the firewall? The only one I could think =
of would be oil pressure and I would recommend using an electric oil =
pressure gauge instead. Yes I mean fuel lines. My fuel supply line =
transitions from aluminum to flex at a bulkhead fitting in the firewall.
Jim Anglin
HR II N144HR
DO NOT ARCHIVE
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Jim Anglin
HR II N144HR |
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