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-   -   Andair Valve Extension (https://vansairforce.net/community/showthread.php?t=106292)

Bootscooter 11-06-2013 01:57 PM

Andair Valve Extension
 
Hi All,

I have searched the forums but still can't find the answer, does anyone have the ACS Part number for the Andair 6" valve extension that I have to get, the valve I have got from Vans but they dont have the extension.


Brgs Chad

rleffler 11-06-2013 02:32 PM

Quote:

Originally Posted by Bootscooter (Post 823725)
Hi All,

I have searched the forums but still can't find the answer, does anyone have the ACS Part number for the Andair 6" valve extension that I have to get, the valve I have got from Vans but they dont have the extension.


Brgs Chad

If I remember correctly, it's a non-stocked item from ACS. Just give Andair a call or order off their web. I received mine in about a week after ordering direct from Andair. On this particular item it may be faster than dealing with ACS.

stamper 11-06-2013 07:10 PM

I just made the mount for my andair valve the other night. I made it out of two small pieces of angle and then a flat piece of aluminum and riveted close to the top of the tunnel. put nut plates on the valve itself so the tunnel cover can come off and the valve will stay in place. By moving the mount up you don't need an extension. At least it looks like it is going to work. Can get a picture tomorrow for you if your interested.

paul330 11-07-2013 12:52 AM

It does work but you end up with hassle trying to route the rear heat duct. Ask me how I know...........

rleffler 11-07-2013 03:19 AM

Quote:

Originally Posted by stamper (Post 823820)
I just made the mount for my andair valve the other night. I made it out of two small pieces of angle and then a flat piece of aluminum and riveted close to the top of the tunnel. put nut plates on the valve itself so the tunnel cover can come off and the valve will stay in place. By moving the mount up you don't need an extension. At least it looks like it is going to work. Can get a picture tomorrow for you if your interested.

There is a reason why Van's move the fuel valve mounting point lower in the tunnel. It used to be higher in the early kits. Now you are forced to route the heater scat tube under the valve, which will heat your fuel lines creating a potential situation for vapor lock. Search on VAF for "hot tunnel", you'll find some interesting reading.

paul330 11-07-2013 06:23 AM

Quote:

Originally Posted by rleffler (Post 823902)
There is a reason why Van's move the fuel valve mounting point lower in the tunnel. It used to be higher in the early kits. Now you are forced to route the heater scat tube under the valve, which will heat your fuel lines creating a potential situation for vapor lock. Search on VAF for "hot tunnel", you'll find some interesting reading.

Exactly the situation I have found myself in. I plan to insulate both the fuel lines (fire sleeve) and the scat (heat mat) in that area. Having said that, I am not so sure that vapour lock is an issue with the rate the fuel moves past.

Jesse 11-07-2013 10:28 AM

I have done a lot of thinking about this over the years, and more lately, about the hot tunnel problems. With the heater valves closed, the scat tubes can go anywhere and it shouldn't heat anything up because there is no hot air passing them. I think it is more likely that heat from a hot firewall will transmit through the aluminum (heat sink) tunnel walls that is connected with rivets. Even more of an issue with the hot air from the heat muffs dumping right on that area of the firewall. The firewall itself gets really hot. I think insulation on the inside of the tunnel keeps the tunnel cool more than the tunnel walls cool. Insulation on the outside should keep the pilot/passenger more comfortable.

Is my reasoning way off here? I haven't done testing, but this is my thought.

Bill.Peyton 11-07-2013 07:28 PM

Bob,
In the current plans the scat runs over the top of the valve, not under it.

Jesse,
I agree with your observations. The hot tunnel was partially solved by the exhaust extension and downward deflection in the later produced kits. Also, using the stainless heat valves on the firewalls probably contributes to the cooler tunnel. I insulated the bottom of the tunnel with 2 layers of fiberfrax and one layer of 3/8" foam. Same with the firewall. My tunnel side walls are cool to the touch when the heat is off.

rleffler 11-08-2013 03:42 AM

Quote:

Originally Posted by Bill.Peyton (Post 824135)
Bob,
In the current plans the scat runs over the top of the valve, not under it.

Correct, Notice that my response was to Stamper that solicited comments about him installing the fuel valve to the tunnel cover in a non-standard location. In his case, he has to run the scat tube between his fuel lines.

Bill.Peyton 11-08-2013 06:53 AM

Sorry Bob, I mis-read!


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