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  #1  
Old 12-26-2012, 06:18 PM
jpharrell jpharrell is offline
 
Join Date: Jan 2010
Location: Mission Viejo, CA
Posts: 130
Default Mixture Cable Routing with AFP and Vertical Induction

I am looking for help routing the mixture cable for my RV-7A with vertical induction and Airflow Performance fuel injection. This is not a configuration covered by a standard Vans firewall forward kit but they recommended the FWF kit for the vertical induction with a carb as the closest match so that is what I bought. I know there are at least a few other builders out there with this configuration that have worked through the differences before me but I have not been able to find details on the web describing how others have solved this problem. For myself and others with this configuration I am hoping for some pictures of where the firewall penetration should be, where the cable should be tied down nearest the servo, and the length of the mixture cable used.

I have the servo mounted along with the brackets that came with the AFP hardware so I can check out various routing approaches. I do not have the Vetterman cross-over exhaust installed yet so that might also come into consideration. I started by looking at the location of the firewall penetration recommended by Vans for the horizontal induction layout but it seems too far to the left, way off the direct route, and I am sure the stock 47 inch mixture cable will be too short. Alternatively I am considering putting the penetration through the firewall recess and then taking a relatively straight shot down beside the breather tube and between two of the tubes for the nose gear mount as illustrated by the red line on the photo below. It looks like a 47 inch mixture cable might be just about perfect for that route.



Has anyone tried this routing ... or is there a better routing I have not found?
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John Harrell
RV-7A Tip-up, Aero Sport Power IO-360, Dual PMags, AFP FI, Catto 3-blade, Dual Dynon Skyviews
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Mission Viejo, CA
http://www.johnsrv7a.wordpress.com

Last edited by jpharrell : 12-26-2012 at 06:23 PM.
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  #2  
Old 12-26-2012, 06:55 PM
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Walt Walt is online now
 
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Default

I have the same setup, throttle and mix both exit below the heater box.
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  #3  
Old 12-26-2012, 07:01 PM
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Default

I also have the same setup (except on a taildragger) and like Walt have throttle and mixture both exit below the heater box.
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  #4  
Old 12-26-2012, 07:43 PM
jpharrell jpharrell is offline
 
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Default Mixture Cable Length?

Walt,

My throttle penetration is just to the left of the nose gear mount (facing the firewall from the engine side, see below). I assume you mean your mixture cable penetration is opposite it on the right hand side. Any photos available? How long is your mixture cable?



John
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RV-7A Tip-up, Aero Sport Power IO-360, Dual PMags, AFP FI, Catto 3-blade, Dual Dynon Skyviews
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Mission Viejo, CA
http://www.johnsrv7a.wordpress.com

Last edited by jpharrell : 12-26-2012 at 07:45 PM.
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  #5  
Old 12-26-2012, 08:11 PM
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Quote:
Originally Posted by jpharrell View Post
Walt,

My throttle penetration is just to the left of the nose gear mount (facing the firewall from the engine side, see below). I assume you mean your mixture cable penetration is opposite it on the right hand side. Any photos available? How long is your mixture cable?


John
I looked and could not find a good photo, but, yes, my mixture cable is opposite it on the right hand side (looking aft). Also, I don't recall the mixture cable length, but I have a DJM throttle quadrant so it is probably irrelevent to your application. I have records of purchasing a 43" quadrant cable and a 45.5" quadrant cable from Van's, but I don't remember which is which.
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  #6  
Old 12-27-2012, 09:21 AM
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Kentsrv7a Kentsrv7a is offline
 
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Just a suggestion but I would mount the exhaust and fuel lines beforehand. It makes the control cable installation more obvious as to the routing. You can then get a better measurement on the cable length for the planned routing.
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  #7  
Old 12-27-2012, 12:20 PM
Rupester Rupester is offline
 
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Default I have the routing you show ...

...for my mixture cable connection to my Silverhawk servo. The cable eyeball is on the top slanted face of the firewall inset. It was my second try at an acceptable routing and it works great. The first attempt, on the pilot's side of the FW where Vans shows it, was too long for any of the Vans-offered mixture cables.
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  #8  
Old 12-27-2012, 05:04 PM
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swisseagle swisseagle is offline
 
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Default I have the routing you show ...

Hello John

I have the routing you show ...

An eyeball in the upper (slanted) surface of the recess, for both, the throttle an the mixture cable.

Works well, no binding or forcing in the cable, but not flown yet.

I choosed this setup to have the leg room free of cable.

Regards, Dominik
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  #9  
Old 12-28-2012, 12:18 AM
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BSwayze BSwayze is offline
 
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John,

Thank you for asking this question. I'll be making the same decision here very shortly, and my configuration will be just like yours. Please post some photos and an update when you get it figured out and finished, will you? Thanks!
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  #10  
Old 12-28-2012, 01:37 PM
jpharrell jpharrell is offline
 
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Default Be happy to ...

Bruce,

I'll be happy to post what I discover with the input of the community of builders. I'm posting incremental progress on my blog as I go but I will post a summary here when I get to through the learning phase as well. I could not find much on this particular configuration on the web so I think posting some detailed photos might be of benefit to others. I have seen on your web site that you often do the same.

John
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RV-7A Tip-up, Aero Sport Power IO-360, Dual PMags, AFP FI, Catto 3-blade, Dual Dynon Skyviews
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http://www.johnsrv7a.wordpress.com
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