UK Vans RV Builder & Pilot Forum - minimum fuel pressure

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minimum fuel pressure (Read 4665 times)

simpleflying

YaBB Newbies

RV6 Slowbuild IO-320
Sensenitch fixed
pitch

Posts: 22
Gender: male

minimum fuel pressure
21.08.2011 at 10:09:27

I'm getting close to applying for permit to test on my RV6. The LAA process for measuring fuel flow on the electric fuel pump requires the minimum fuel pressure at the carb inlet. The Lycoming manual for my IO-320-D1A only shows min pressure at the injectors. is this correct? Also, the Precision Airmotive Silver Hwk web pages show a nominal min pressure required between 20-50psi. I'm a bit confused, can anyone help please!

Neil Rawlinson

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Mark Browning

Senior Member

RV-7 I0360 G-IVII
Flying, Built
G-LNNE

Posts: 399
Gender: male

Re: minimum fuel pressure
Reply #1 - 23.08.2011 at 13:24:09

Hi Neil
I have the fuel flow data sheet to hand from my RV-7 (carb) if you give me your e-mail i will scan it and mail it over to you.
The mininumiun alowable fuel pressure at the a normal carburettor inlet is 0.5lbs or 0.344 bar.
However because yours is injected it will will have a higher pressure at the inlet.
The fuel flow information the laa need is at the inlet not the injectors
Your inspector should have a Lycoming manual which wil give the data.

Regards
Mark
mbrowning@mazdaeur.com

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simpleflying YaBB Newbies RV6 Slowbuild IO-320 Sensenitch fixed pitch Posts: 22 Gender:	Re: minimum fuel pressure Reply #2 - 23.08.2011 at 13:27:16 Mark rhanks. email is neilandlesleyrawlinson@hotmail.com
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Mark Browning Senior Member RV-7 I0360 G-IVII Flying, Built G-LNNE Posts: 399 Gender:	Re: minimum fuel pressure Reply #3 - 26.08.2011 at 01:27:08 SORRY FOR THE DELAY WILL GET IT SCANED AND SENT AS SOON AS I AM BACK HOME REGARDS MARK
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Andy Hill

YaBB Newbies

RV-8 G-HILZ flying,
RV-3 G-HILI building
(slowly!)

Posts: 48

Re: minimum fuel pressure
Reply #4 - 26.08.2011 at 09:00:12

Superior XP-360 Maunual, which is like a Lycming but Sup... Wink

gives:

Carb 0.5-8.0psi (3.0 'desired')
FI 2 - 35psi

In practice we never measured ours, just did the electric fuel pump flow test. Disconnect pipe from Mech Pump, fill calibarated bucket and time. Best do once from each tank. Ensure (I think) 150%+ of max engine can ask for (which might be 60L/hr? so want ~90L/hr+).

Andy
http://www.rv8tors.com

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Pete Pengilly

Full Member
RV Moderator

Peter Pengilly
Builder, Pilot,
Aeroplane Designer

Posts: 107

Re: minimum fuel pressure
Reply #5 - 26.08.2011 at 13:58:29

Read the requirements carefully as some people go to extrodinary (and occasionally dangerous) lengths for something that is simple. As long as your inspector is content most people do the check that Andy described - time how long it takes for a litre to come out and work it out from there. If you have used conventional pumps of proven performance (Andair or Airflow Performance), you are really checking there are no restrictions in the piping.

Pete

RV-6A "Casper"
Tipper, O-320, fixed pitch

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simpleflying YaBB Newbies RV6 Slowbuild IO-320 Sensenitch fixed pitch Posts: 22 Gender:	Re: minimum fuel pressure Reply #6 - 10.09.2011 at 10:41:51 Thanks chaps, got it sussed now!
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