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AFP mixture cable length

 
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sarg314(at)comcast.net
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PostPosted: Tue Jan 10, 2006 8:54 pm    Post subject: AFP mixture cable length Reply with quote


I spent an embarassingly long amount of time trying to figure out where
the mixture cable (for AFP) should penetrate the firewall and how long
it should be (for RV-6A with IO360). I used my heater cable control to
estimate it. I came up with a length of about 45" or 45.5" . I notice
that Van's mixture cable for a carburator is listed as 45", which is
encouraging.
Can some one with an AFP unit confirm for me that 45" is a reasonable
length for the mixture cable? If you bought the Van's cable, did you
end up thinking it should have been a little longer or shorter?
Thanks,
--
Tom Sargent, RV-6A
Engine.


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recapen(at)earthlink.net
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PostPosted: Wed Jan 11, 2006 4:36 am    Post subject: AFP mixture cable length Reply with quote


I'm getting ready for the same trials and tribulations.......
Tom, Where are you penetrating the firewall? I've got vans FWF plans (a little late in my case - I had already put stuff in so I may not be able to use their given location......
Thanks,
Ralph Capen


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alexpeterson(at)earthlink
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PostPosted: Wed Jan 11, 2006 5:49 am    Post subject: AFP mixture cable length Reply with quote


Quote:


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sarg314(at)comcast.net
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PostPosted: Wed Jan 11, 2006 6:11 am    Post subject: AFP mixture cable length Reply with quote


Ralph:
I am planning to penetrate the firewall about 4.3" up from the floor
and as close as possible to the inboard edge of the vertical 3/4" angle
that is a few inches left of center. This is for a 6. If you have a 7,
the firewall angle may be a bit different. Horizontally the penetration
point is about 3.2" left of the centerline, I think. I didn't measure
that very accurately. My main requirement is to be inboard of that
angle. That gives it a pretty straight shot from the firewall to the
mixture arm on the AFP unit. On the inside, an upward turn of radius 4"
or 5" (depending on how you route it around the horizontal rudder pedal
mount tubes) will get it to the standard place on the inst. panel. I
plan to use a Cablecraft cable that spec's a min. bend radius of 3".
It could penetrate a bit higher, but I have an obstacle on the firewall
there and if I moved it any higher at all it would have to go about 3"
higher to clear, so I decided to keep it down low.
I used a piece of 3/16" dowl held against the mixture arm to
project the path back towards the firewall as I moved the mixture arm.
The cable attach point (for Cablecraft) is 8.4" back from the end of the
cable at max extension (=full rich), so that gives you an idea of where
it has to attach to the mounting bracket. I may not use the
AFP-supplied brackets. I might make my own. Depends on how they line up
once the cable is in hand. BTW, if you don't already have it, note that
Vans has a cable end mounting kit cheap. It has rod end bearing, special
small washers, etc. to connect the cable to the arm on the carb/fuel servo.
Ralph E. Capen wrote:
Quote:

I'm getting ready for the same trials and tribulations.......
Tom, Where are you penetrating the firewall? I've got vans FWF plans (a little late in my case - I had already put stuff in so I may not be able to use their given location......
Thanks,
Ralph Capen

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recapen(at)earthlink.net
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PostPosted: Wed Jan 11, 2006 8:50 am    Post subject: AFP mixture cable length Reply with quote


Tom,
I'm building a 6A and already have my Odyssey battery mounted on the two vertical angles that you reference (If I read/understand correctly). I do have space between the top of the battery and the bottom of the oil-filter bulge that sticks out aft of the firewall.
When you say about 3.2" left of center, I'm thinking you're sitting in the pilot's seat looking under your instrument panel?!
Thanks,
Ralph


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PostPosted: Wed Jan 11, 2006 10:35 am    Post subject: AFP mixture cable length Reply with quote


Ralph:
Yes. Well actually I mean 3.2" left (airplane's left) from the
center of the nose gear. I made the assumption that was the centerline
of the fuselage. It's probably a bit off from centerline.
Ralph E. Capen wrote:
Quote:

Tom,
I'm building a 6A and already have my Odyssey battery mounted on the two vertical angles that you reference (If I read/understand correctly). I do have space between the top of the battery and the bottom of the oil-filter bulge that sticks out aft of the firewall.
When you say about 3.2" left of center, I'm thinking you're sitting in the pilot's seat looking under your instrument panel?!
Thanks,
Ralph

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PostPosted: Fri Jan 13, 2006 4:56 pm    Post subject: AFP mixture cable length Reply with quote

Just to complete this thread for the archive, I have decided to take the
advice of several others and change my mixture and throttle cable
routing plans. The first idea was to bring the cables through the
firewall low so it would have a straight shot to the AFP control arms.
That would have the cable between the bracket on the engine and the
firewall be only about 4" long. That is too short to tolerate engine
movement safely.

I have decided to bring the cable through the firewall just below the
top piece of angle that runs horizontally across the firewall. (I'm
talking about an RV-6A here). That's about 1 foot above the AFP control
arm. The cable will do a graceful S-curve down to the attachment point
on the AFP fuel controller. I think this is much safer, although it
makes things a bit more congested back there.
--
Tom S.
RV-6A


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