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Hoses and O-rings in RV-6 with Lycoming O-320

 
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genie(at)swissmail.org
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PostPosted: Sun Apr 08, 2012 7:45 am    Post subject: Hoses and O-rings in RV-6 with Lycoming O-320 Reply with quote

My plan is to enable my RV-6 and its O-320 engine to run on Mogas,
including the variety that contains ethanol. I have taken a good look
at the fuel system and done some dismantling but I have found no
O-rings. The fuel system contains several hoses, some black, some
wrapped in dark orange. I suppose that the latter is to protect them,
is it not?

I would be grateful if anyone could tell me how many hoses an RV-6
has in its fuel system, what their dimensions are and whether the
fuel system also included O-rings or anything else that may be
susceptible to Mogas, ethanol or water. If that is the case I would
like to know how many of these are present and what their dimensions
are. Thanks.

Kind regards

George Nielsen
RV-6 PH-XGN
The Hague, the Netherlands


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ceengland(at)bellsouth.ne
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PostPosted: Sun Apr 08, 2012 3:36 pm    Post subject: Hoses and O-rings in RV-6 with Lycoming O-320 Reply with quote

On 04/08/2012 09:48 AM, George Nielsen wrote:
Quote:


My plan is to enable my RV-6 and its O-320 engine to run on Mogas,
including the variety that contains ethanol. I have taken a good look
at the fuel system and done some dismantling but I have found no
O-rings. The fuel system contains several hoses, some black, some
wrapped in dark orange. I suppose that the latter is to protect them,
is it not?

I would be grateful if anyone could tell me how many hoses an RV-6 has
in its fuel system, what their dimensions are and whether the fuel
system also included O-rings or anything else that may be susceptible
to Mogas, ethanol or water. If that is the case I would like to know
how many of these are present and what their dimensions are. Thanks.

Kind regards

George Nielsen
RV-6 PH-XGN
The Hague, the Netherlands
If the fuel system is 'stock', as designed by Van's, and you have the

standard fuel pickups in the tanks (not the 'flop tubes'), then there
should be only aluminum line & aluminum fittings from the tank to the
firewall, with metal-to-metal flare fittings; no O-rings. Van's stock
fuel selector should be fine, as well. Depending on age, if you have a
gascolator, it could very well have rubber gaskets that alcohol will
attack. The flexible hoses are an unknown. If you can't determine the
actual materials in the hoses, the safe thing would be to simply replace
.them with teflon lined hose. (USA FAA recommendation is to replace any
but the new teflon type hose every 5 years, anyway, though many people
don't do that.) The mechanical fuel pump will likely need to be rebuilt
with current technology diaphragms & seals; older mechanical pumps *do
not* survive alcohol for very long. The carb or injector is likely OK,
but I'd contact the manufacturer to be sure.

Hope that helps,

Charlie


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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 738

PostPosted: Sun Apr 08, 2012 6:17 pm    Post subject: Hoses and O-rings in RV-6 with Lycoming O-320 Reply with quote

George:

Unless you went with some NON-Aviation hoses there is NOTHING that you have to do.
ALL aviation hoses have to comply with the ability to handle alcohol in 100% concentrations.
When a GA aircraft receives the STC for MoGas all the testing was performed on the engine and air frame as supplied from the factory - NO physical changes have to take place.
Ethanol is a problem with fiberglass fuel tanks and what is known as PRC sealants.  Other than that GO FOR IT.  And if you do a little online homework you will find a procedure to "WASH" the ethanol out of MoGas.


Barry
Sun, Apr 8, 2012 at 10:48 AM, George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)> wrote: [quote]--> RV6-List message posted by: George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)>

My plan is to enable my RV-6 and its O-320 engine to run on Mogas, including the variety that contains ethanol. I have taken a good look at the fuel system and done some dismantling but I have found no O-rings. The fuel system contains several hoses, some black, some wrapped in dark orange. I suppose that the latter is to protect them, is it not?

I would be grateful if anyone could tell me how many hoses an RV-6 has in its fuel system, what their dimensions are and whether the fuel system also included O-rings or anything else that may be susceptible to Mogas, ethanol or water. If that is the case I would like to know how many of these are present and what their dimensions are. Thanks.

Kind regards

George Nielsen
RV-6 PH-XGN
The Hague, the Netherlands


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Doug Gray



Joined: 10 Jan 2006
Posts: 112
Location: Sydney, Australia

PostPosted: Sun Apr 08, 2012 10:20 pm    Post subject: Hoses and O-rings in RV-6 with Lycoming O-320 Reply with quote

PRC manufactures amongst other things polysulphide fuel tank sealant (aka Proseal) that is universally used in RV fuel tanks.. I thought Proseal was compatible with alcohol; is that not the case? Does PRC mean something else?
Doug

Sent from my iPad

On 09/04/2012, at 12:14 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:

[quote]George:

Unless you went with some NON-Aviation hoses there is NOTHING that you have to do.
ALL aviation hoses have to comply with the ability to handle alcohol in 100% concentrations.
When a GA aircraft receives the STC for MoGas all the testing was performed on the engine and air frame as supplied from the factory - NO physical changes have to take place.
Ethanol is a problem with fiberglass fuel tanks and what is known as PRC sealants. Other than that GO FOR IT. And if you do a little online homework you will find a procedure to "WASH" the ethanol out of MoGas.


Barry
Sun, Apr 8, 2012 at 10:48 AM, George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)> wrote:
Quote:
--> RV6-List message posted by: George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)>

My plan is to enable my RV-6 and its O-320 engine to run on Mogas, including the variety that contains ethanol. I have taken a good look at the fuel system and done some dismantling but I have found no O-rings. The fuel system contains several hoses, some black, some wrapped in dark orange. I suppose that the latter is to protect them, is it not?

I would be grateful if anyone could tell me how many hoses an RV-6 has in its fuel system, what their dimensions are and whether the fuel system also included O-rings or anything else that may be susceptible to Mogas, ethanol or water. If that is the case I would like to know how many of these are present and what their dimensions are. Thanks.

Kind regards

George Nielsen
RV-6 PH-XGN
The Hague, the Netherlands


====================================
rget="_blank">http://www.matronics.com/Navigator?RV6-List
====================================
http://forums.matronics.com
====================================
le, List Admin.
="_blank">http://www.matronics.com/contribution
====================================





[b]


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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 738

PostPosted: Mon Apr 09, 2012 4:12 am    Post subject: Hoses and O-rings in RV-6 with Lycoming O-320 Reply with quote

Doug:

You are correct.
PRC, PROSEAL and other manufactures, are Polysulphide Sealants.
Two answers:
1 - The OLD chemistry was compatible to alcohol - The chemistry of today for the sealant is not as good.
2 - The OLD chemistry did not have to deal with ethanol and from doing sealing jobs on Grumman's (wet wings), I find it does NOT hold up to today's MoGas.  There are other sealants that are NOT available in the USA due to EPA regulations.  MAYBE, they will hold up.  But, there is also a lot of other new chemicals known as AROMATICS that have been added to MoGas, they also attack the sealant.   


Barry
On Mon, Apr 9, 2012 at 2:17 AM, Doug Gray <dgra1233(at)bigpond.net.au (dgra1233(at)bigpond.net.au)> wrote:
[quote]PRC manufactures amongst other things  polysulphide fuel tank sealant (aka Proseal) that is universally used in RV fuel tanks..  I thought Proseal was compatible with alcohol; is that not the case? Does PRC mean something else?
Doug

Sent from my iPad

On 09/04/2012, at 12:14 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:


Quote:
George:

Unless you went with some NON-Aviation hoses there is NOTHING that you have to do.
ALL aviation hoses have to comply with the ability to handle alcohol in 100% concentrations.
When a GA aircraft receives the STC for MoGas all the testing was performed on the engine and air frame as supplied from the factory - NO physical changes have to take place.
Ethanol is a problem with fiberglass fuel tanks and what is known as PRC sealants.  Other than that GO FOR IT.  And if you do a little online homework you will find a procedure to "WASH" the ethanol out of MoGas.


Barry

Sun, Apr 8, 2012 at 10:48 AM, George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)> wrote:
Quote:
--> RV6-List message posted by: George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)>

My plan is to enable my RV-6 and its O-320 engine to run on Mogas, including the variety that contains ethanol. I have taken a good look at the fuel system and done some dismantling but I have found no O-rings. The fuel system contains several hoses, some black, some wrapped in dark orange. I suppose that the latter is to protect them, is it not?

I would be grateful if anyone could tell me how many hoses an RV-6 has in its fuel system, what their dimensions are and whether the fuel system also included O-rings or anything else that may be susceptible to Mogas, ethanol or water. If that is the case I would like to know how many of these are present and what their dimensions are. Thanks.

Kind regards

George Nielsen
RV-6 PH-XGN
The Hague, the Netherlands



====================================
rget="_blank">http://www.matronics.com/Navigator?RV6-List
====================================
http://forums.matronics.com
====================================
le, List Admin.
="_blank">http://www.matronics.com/contribution
====================================







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